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96-533: The need for a bridge was beyond doubt and long overdue as the towns of Ambridge and Woodlawn, which had populations in the hundreds at the turn of the 20th century, exceeded 40,000 by the late 1920s. In September 1924, the plans for a bridge over the Ohio River linking Ambridge and Woodlawn were revived from earlier ones shelved in 1917 by the outbreak of the First World War. A bond issue for $ 1.5 million

192-766: A 790-foot main span, and the East Bay Bridge of the San Francisco Oakland Bay Bridge built in 1937 with a 1,400 foot main span. The first Carquinez Strait Bridge in Vallejo, CA, built in 1927, was a back-to-back 1,100 foot cantilevered truss. The bridge was closed temporarily in November 2021 for repairs, causing extreme traffic problems for residents of the surrounding community. It reopened in December 2021 with no plans for closures in

288-412: A BOS process is manufactured in one-twelfth the time. Today, electric arc furnaces (EAF) are a common method of reprocessing scrap metal to create new steel. They can also be used for converting pig iron to steel, but they use a lot of electrical energy (about 440 kWh per metric ton), and are thus generally only economical when there is a plentiful supply of cheap electricity. The steel industry

384-713: A carbon-intermediate steel by the 1st century AD. There is evidence that carbon steel was made in Western Tanzania by the ancestors of the Haya people as early as 2,000 years ago by a complex process of "pre-heating" allowing temperatures inside a furnace to reach 1300 to 1400 °C. Evidence of the earliest production of high carbon steel in South Asia is found in Kodumanal in Tamil Nadu ,

480-444: A change of volume. In this case, expansion occurs. Internal stresses from this expansion generally take the form of compression on the crystals of martensite and tension on the remaining ferrite, with a fair amount of shear on both constituents. If quenching is done improperly, the internal stresses can cause a part to shatter as it cools. At the very least, they cause internal work hardening and other microscopic imperfections. It

576-428: A ferrite BCC crystal form, but at higher carbon content it takes a body-centred tetragonal (BCT) structure. There is no thermal activation energy for the transformation from austenite to martensite. There is no compositional change so the atoms generally retain their same neighbours. Martensite has a lower density (it expands during the cooling) than does austenite, so that the transformation between them results in

672-445: A hard but brittle martensitic structure. The steel is then tempered, which is just a specialized type of annealing, to reduce brittleness. In this application the annealing (tempering) process transforms some of the martensite into cementite, or spheroidite and hence it reduces the internal stresses and defects. The result is a more ductile and fracture-resistant steel. When iron is smelted from its ore, it contains more carbon than

768-645: A list of historic edifices, modernized and converted to a restaurant. During 1910 - 1930, the P & LE operated 50 passenger daily trains on its 65-mile Pittsburgh - Youngstown portion of its system. Ticketing agreements with the Erie RR and the P & LE's parent New York Central, passengers boarding in Pittsburgh could ride coaches or sleepers west to Toledo, Detroit, Chicago, and St. Louis, and north to Cleveland, Buffalo, Toronto, Albany and Boston. The Baltimore & Ohio RR obtained trackage rights in 1934 on

864-412: A narrow range of concentrations of mixtures of carbon and iron that make steel, several different metallurgical structures, with very different properties can form. Understanding such properties is essential to making quality steel. At room temperature , the most stable form of pure iron is the body-centred cubic (BCC) structure called alpha iron or α-iron. It is a fairly soft metal that can dissolve only

960-534: A small concentration of carbon, no more than 0.005% at 0 °C (32 °F) and 0.021 wt% at 723 °C (1,333 °F). The inclusion of carbon in alpha iron is called ferrite . At 910 °C, pure iron transforms into a face-centred cubic (FCC) structure, called gamma iron or γ-iron. The inclusion of carbon in gamma iron is called austenite. The more open FCC structure of austenite can dissolve considerably more carbon, as much as 2.1%, (38 times that of ferrite) carbon at 1,148 °C (2,098 °F), which reflects

1056-450: A steel plant and the other in the bridge company’s fabrication yard was duly noted. Local supporters claimed, “Only the paint had to be brought in”. Even the gravel and sand for the piers were excavated from the river by the local contractor, Dravo. The Ambridge–Aliquippa Bridge’s cantilevered trusses are made from riveted steel, a design favored from the 1920s through the 1970s for crossings with 600 to 1,400 foot main spans. In addition to

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1152-453: A steel's final rolling, it is heat treated for strength; however, this is relatively rare. Steel was known in antiquity and was produced in bloomeries and crucibles . The earliest known production of steel is seen in pieces of ironware excavated from an archaeological site in Anatolia ( Kaman-Kalehöyük ) which are nearly 4,000 years old, dating from 1800 BC. Wootz steel

1248-672: Is continuously cast into long slabs, cut and shaped into bars and extrusions and heat treated to produce a final product. Today, approximately 96% of steel is continuously cast, while only 4% is produced as ingots. The ingots are then heated in a soaking pit and hot rolled into slabs, billets , or blooms . Slabs are hot or cold rolled into sheet metal or plates. Billets are hot or cold rolled into bars, rods, and wire. Blooms are hot or cold rolled into structural steel , such as I-beams and rails . In modern steel mills these processes often occur in one assembly line , with ore coming in and finished steel products coming out. Sometimes after

1344-403: Is common for quench cracks to form when steel is water quenched, although they may not always be visible. There are many types of heat treating processes available to steel. The most common are annealing , quenching , and tempering . Annealing is the process of heating the steel to a sufficiently high temperature to relieve local internal stresses. It does not create a general softening of

1440-403: Is desirable. To become steel, it must be reprocessed to reduce the carbon to the correct amount, at which point other elements can be added. In the past, steel facilities would cast the raw steel product into ingots which would be stored until use in further refinement processes that resulted in the finished product. In modern facilities, the initial product is close to the final composition and

1536-453: Is distinguishable from wrought iron (now largely obsolete), which may contain a small amount of carbon but large amounts of slag . Iron is commonly found in the Earth's crust in the form of an ore , usually an iron oxide, such as magnetite or hematite . Iron is extracted from iron ore by removing the oxygen through its combination with a preferred chemical partner such as carbon which

1632-408: Is heat treated to contain both a ferritic and martensitic microstructure to produce a formable, high strength steel. Transformation Induced Plasticity (TRIP) steel involves special alloying and heat treatments to stabilize amounts of austenite at room temperature in normally austenite-free low-alloy ferritic steels. By applying strain, the austenite undergoes a phase transition to martensite without

1728-535: Is known as stainless steel . Tungsten slows the formation of cementite , keeping carbon in the iron matrix and allowing martensite to preferentially form at slower quench rates, resulting in high-speed steel . The addition of lead and sulphur decrease grain size, thereby making the steel easier to turn , but also more brittle and prone to corrosion. Such alloys are nevertheless frequently used for components such as nuts, bolts, and washers in applications where toughness and corrosion resistance are not paramount. For

1824-691: Is often considered an indicator of economic progress, because of the critical role played by steel in infrastructural and overall economic development . In 1980, there were more than 500,000 U.S. steelworkers. By 2000, the number of steelworkers had fallen to 224,000. The economic boom in China and India caused a massive increase in the demand for steel. Between 2000 and 2005, world steel demand increased by 6%. Since 2000, several Indian and Chinese steel firms have expanded to meet demand, such as Tata Steel (which bought Corus Group in 2007), Baosteel Group and Shagang Group . As of 2017 , though, ArcelorMittal

1920-514: Is one of the largest manufacturing industries in the world, but also one of the most energy and greenhouse gas emission intense industries, contributing 8% of global emissions. However, steel is also very reusable: it is one of the world's most-recycled materials, with a recycling rate of over 60% globally . The noun steel originates from the Proto-Germanic adjective * * stahliją or * * stakhlijan 'made of steel', which

2016-463: Is one of the most commonly manufactured materials in the world. Steel is used in buildings, as concrete reinforcing rods, in bridges, infrastructure, tools, ships, trains, cars, bicycles, machines, electrical appliances, furniture, and weapons. Iron is always the main element in steel, but many other elements may be present or added. Stainless steels , which are resistant to corrosion and oxidation , typically need an additional 11% chromium . Iron

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2112-551: Is one of the world's most-recycled materials, with a recycling rate of over 60% globally; in the United States alone, over 82,000,000 metric tons (81,000,000 long tons; 90,000,000 short tons) were recycled in the year 2008, for an overall recycling rate of 83%. As more steel is produced than is scrapped, the amount of recycled raw materials is about 40% of the total of steel produced - in 2016, 1,628,000,000 tonnes (1.602 × 10 long tons; 1.795 × 10 short tons) of crude steel

2208-520: Is possible only by reducing iron's ductility. Steel was produced in bloomery furnaces for thousands of years, but its large-scale, industrial use began only after more efficient production methods were devised in the 17th century, with the introduction of the blast furnace and production of crucible steel . This was followed by the Bessemer process in England in the mid-19th century, and then by

2304-434: Is possible to make very high-carbon (and other alloy material) steels, but such are not common. Cast iron is not malleable even when hot, but it can be formed by casting as it has a lower melting point than steel and good castability properties. Certain compositions of cast iron, while retaining the economies of melting and casting, can be heat treated after casting to make malleable iron or ductile iron objects. Steel

2400-400: Is quite ductile , or soft and easily formed. In steel, small amounts of carbon, other elements, and inclusions within the iron act as hardening agents that prevent the movement of dislocations . The carbon in typical steel alloys may contribute up to 2.14% of its weight. Varying the amount of carbon and many other alloying elements, as well as controlling their chemical and physical makeup in

2496-457: Is related to * * stahlaz or * * stahliją 'standing firm'. The carbon content of steel is between 0.02% and 2.14% by weight for plain carbon steel ( iron - carbon alloys ). Too little carbon content leaves (pure) iron quite soft, ductile, and weak. Carbon contents higher than those of steel make a brittle alloy commonly called pig iron . Alloy steel is steel to which other alloying elements have been intentionally added to modify

2592-441: Is the base metal of steel. Depending on the temperature, it can take two crystalline forms (allotropic forms): body-centred cubic and face-centred cubic . The interaction of the allotropes of iron with the alloying elements, primarily carbon, gives steel and cast iron their range of unique properties. In pure iron, the crystal structure has relatively little resistance to the iron atoms slipping past one another, and so pure iron

2688-547: Is the world's largest steel producer . In 2005, the British Geological Survey stated China was the top steel producer with about one-third of the world share; Japan , Russia , and the United States were second, third, and fourth, respectively, according to the survey. The large production capacity of steel results also in a significant amount of carbon dioxide emissions inherent related to

2784-498: Is then lost to the atmosphere as carbon dioxide. This process, known as smelting , was first applied to metals with lower melting points, such as tin , which melts at about 250 °C (482 °F), and copper , which melts at about 1,100 °C (2,010 °F), and the combination, bronze, which has a melting point lower than 1,083 °C (1,981 °F). In comparison, cast iron melts at about 1,375 °C (2,507 °F). Small quantities of iron were smelted in ancient times, in

2880-517: Is to be replaced by a regional CSX intermodal facility. In 1904, P&LE built the O'Donovan Bridge for easier automobile access from Island Avenue to The Bottoms without crossing the railroad tracks. This was replaced in 1931 by the McKees Rocks Bridge , which extended to Ohio River Boulevard but still provided access to The Bottoms via Helen Street exit. The McKees Rocks Community Development Corporation has plans to adaptively reuse

2976-655: The Golconda area in Andhra Pradesh and Karnataka , regions of India , as well as in Samanalawewa and Dehigaha Alakanda, regions of Sri Lanka . This came to be known as wootz steel , produced in South India by about the sixth century BC and exported globally. The steel technology existed prior to 326 BC in the region as they are mentioned in literature of Sangam Tamil , Arabic, and Latin as

Ambridge–Aliquippa Bridge - Misplaced Pages Continue

3072-611: The Monongahela River to McKeesport, Pennsylvania , then the Youghiogheny River to Connellsville , Pennsylvania. Mileage on this P&LE branch was reckoned from the passenger terminal back at the Smithfield Street Bridge. The Pittsburgh, McKeesport & Youghiogheny Railroad also followed the Monongahela River to Brownsville, Pennsylvania . The Pittsburgh and Lake Erie Railroad

3168-599: The cementation process was described in a treatise published in Prague in 1574 and was in use in Nuremberg from 1601. A similar process for case hardening armour and files was described in a book published in Naples in 1589. The process was introduced to England in about 1614 and used to produce such steel by Sir Basil Brooke at Coalbrookdale during the 1610s. The raw material for this process were bars of iron. During

3264-607: The open-hearth furnace . With the invention of the Bessemer process, a new era of mass-produced steel began. Mild steel replaced wrought iron . The German states were the major steel producers in Europe in the 19th century. American steel production was centred in Pittsburgh , Bethlehem, Pennsylvania , and Cleveland until the late 20th century. Currently, world steel production is centered in China, which produced 54% of

3360-445: The 17th century, it was realized that the best steel came from oregrounds iron of a region north of Stockholm , Sweden. This was still the usual raw material source in the 19th century, almost as long as the process was used. Crucible steel is steel that has been melted in a crucible rather than having been forged , with the result that it is more homogeneous. Most previous furnaces could not reach high enough temperatures to melt

3456-475: The 17th century, the first step in European steel production has been the smelting of iron ore into pig iron in a blast furnace . Originally employing charcoal, modern methods use coke , which has proven more economical. In these processes, pig iron made from raw iron ore was refined (fined) in a finery forge to produce bar iron , which was then used in steel-making. The production of steel by

3552-577: The 1993 CSX takeover of P&LE, Gateway Yard was closed and most tracks have been removed. The yard tower still stands but has been heavily vandalized. The McKees Rocks Yard facility was home to a yard, major locomotive rebuilding and general maintenance, as well as freight car repair and maintenance. On the westernmost end of the McKees Rocks yard, the P&;LE interchanged with the PC&;Y. However,

3648-608: The Arabs from Persia, who took it from India. It was originally created from several different materials including various trace elements , apparently ultimately from the writings of Zosimos of Panopolis . In 327 BC, Alexander the Great was rewarded by the defeated King Porus , not with gold or silver but with 30 pounds of steel. A recent study has speculated that carbon nanotubes were included in its structure, which might explain some of its legendary qualities, though, given

3744-631: The Kondike Coke fields. Later in 1915 it reached Fairmont, West Virginia . When Conrail was formed, the Pittsburgh and Lake Erie Railroad again became an independent company because P&LE was owed $ 15.2 million by Penn Central, and operated as such until its merger into CSX Transportation (CSX). Starting in 1934, the Baltimore and Ohio Railroad (B&O) bought trackage rights over P&LE from McKeesport to New Castle. The B&O's route through Pittsburgh had excessive grades and curves. In

3840-464: The Lake Shore and Michigan Southern Railway was reached for routing traffic at Youngstown , Ohio. The final track laying between Pittsburgh and Youngstown was on January 27, 1879. At the opening in 1879, the P&LE was a poorly built, single track line. Fortunately for the railroad it was an immediate success and money was soon available for improvements. In 1881, the P&LE became linked with

3936-470: The Linz-Donawitz process of basic oxygen steelmaking (BOS), developed in 1952, and other oxygen steel making methods. Basic oxygen steelmaking is superior to previous steelmaking methods because the oxygen pumped into the furnace limited impurities, primarily nitrogen, that previously had entered from the air used, and because, with respect to the open hearth process, the same quantity of steel from

Ambridge–Aliquippa Bridge - Misplaced Pages Continue

4032-496: The McKees Rocks shops were built. The company came under more formal control in 1887 by the New York Central Railroad . Lake Shore and Michigan Southern Railway's president, John Newell, took over as president of the P&LE in 1887. Under Newell, Reed and Colonel Schoonmaker; the P&LE would become the "Little Giant". From 1887 to 1927, the P&LE would become a heavy duty railroad, with double track all

4128-669: The Monongahela River to Brownsville, Pennsylvania in 1901. The Pennsylvania Railroad at the same time had extended to Brownsville. Both the PRR and the P&LE had plans to extend even further up the river into West Virginia coke fields. Most likely due to the South Penn, they decided to work together by using the Monongahela Railway . The Monongahela Railway then was extended south to Martin, Pennsylvania reaching

4224-745: The Ohio River and two railways, the bridge crosses two main highways making the full length 1,908 feet excluding the end spans. Thousands of bridges very similar were built across the US during that time, especially in the eastern US. Contemporaries constructed by the American Bridge Company include the Louisville Municipal Bridge in 1929 with an 820-foot main span, the Huey P. Long Bridge in New Orleans built in 1935 with

4320-742: The P&LE Terminal in Pittsburgh. The original line continued east past that station for a little over two miles (3.2 km) (listed in Youghiogheny Branch table below) to near 24th Street in the South Side Flats neighborhood of Pittsburgh, where it met the Monongahela Connecting Railroad and the Pittsburgh, McKeesport & Youghiogheny (PM&Y). The Pittsburgh, McKeesport and Youghiogheny Railroad ran from 24th Street in Pittsburgh, PA to Connellsville, Pennsylvania, in 1882. The PM&Y followed

4416-519: The P&LE, and Chicago-New York trains such as the Capitol Limited (Chicago-Washington), Columbian (Chicago-Washington) and Ambassador (Detroit-Baltimore) operated over the P & LE between New Castle Junction and McKeesport. These trains stopped at the Terminal located in Pittsburgh's South Side. The trackage sharing arrangement continued until Amtrak assumed responsibility for

4512-464: The PC&Y facilities were just behind the P&LE Locomotive facilities in the main yard, and trackage from the PC&Y crossed the P&LE Mainline at this point, servicing several local businesses in the Bottoms section of McKees Rocks, finally making the previously mentioned interchange. Most of the McKees Rocks facilities are now gone. The entire McKees Rocks locomotive facility, shops, and yard

4608-470: The PM&;Y all of the funds to build to Connellsville, Pennsylvania and then lease it to the P&LE for 99 years. The PM&Y in the end was the only part of the South Penn that was built, but it would be an important part of the P&LE. The PM&Y opened in 1883 and leased to the P&LE in 1884. Concurrently in 1883, to get the P&LE ready for the expected new business due to the South Penn linkage,

4704-488: The Pennsylvania Secretary of State. The stated length of the railroad was for 57 miles (92 km). After 2 years the starting group was not very successful at raising the required funds and in 1877 many of the directors were succeeded by a new group of Pittsburgh businessmen. The new group was James I. Bennett, David Hostetter , James M. Baily, Mark W. Watson and James M. Schoonmaker, all influential. In

4800-609: The Smithfield Street Bridge. The Pittsburgh Terminal was the railroad's headquarters, passenger train shed, and freight warehouse complex. In the upper photo, the terminal sits along the Monongahela river. The roof of the freight house is to the right of the terminal train shed. The former P&LE headquarters building at the bottom of the Monongahela Incline has been converted into a present-day shopping center, Station Square . The passenger station has been placed on

4896-531: The US that year, the last one linking Ambridge and Woodlawn across the Ohio river was likely to have been the shortest distance hauled from factory to construction site. When the Ambridge-Woodlawn Bridge opened to the public that winter, the local paper reported the usual fanfare, commemorations, and even an “aerial bombardment”. The extreme convenience of building a bridge with one end adjacent to

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4992-615: The areas of its main train line extending the line north to Youngstown and south to Connellsville. This provided a means of transportation from the steel centers of Pittsburgh to the Great Lakes and St. Lawrence Seaway area. The original line ran between Youngstown, Ohio (at Haselton) and 24th Street in Pittsburgh, Pennsylvania near the Jones and Laughlin Iron Works , opened in 1879. The P&LE's passenger terminal in Pittsburgh

5088-436: The austenite grain boundaries until the percentage of carbon in the grains has decreased to the eutectoid composition (0.8% carbon), at which point the pearlite structure forms. For steels that have less than 0.8% carbon (hypoeutectoid), ferrite will first form within the grains until the remaining composition rises to 0.8% of carbon, at which point the pearlite structure will form. No large inclusions of cementite will form at

5184-471: The austenite is for it to precipitate out of solution as cementite , leaving behind a surrounding phase of BCC iron called ferrite with a small percentage of carbon in solution. The two, cementite and ferrite, precipitate simultaneously producing a layered structure called pearlite , named for its resemblance to mother of pearl . In a hypereutectoid composition (greater than 0.8% carbon), the carbon will first precipitate out as large inclusions of cementite at

5280-494: The boundaries in hypoeutectoid steel. The above assumes that the cooling process is very slow, allowing enough time for the carbon to migrate. As the rate of cooling is increased the carbon will have less time to migrate to form carbide at the grain boundaries but will have increasingly large amounts of pearlite of a finer and finer structure within the grains; hence the carbide is more widely dispersed and acts to prevent slip of defects within those grains, resulting in hardening of

5376-600: The building. The College Hill neighborhood of Beaver Falls had a small yard located just below Geneva College along the Beaver River . There was also a small roundhouse on the property, plus the College Hill Station . Today, only the station remains. Steel Steel is an alloy of iron and carbon with improved strength and fracture resistance compared to other forms of iron. Because of its high tensile strength and low cost, steel

5472-521: The characteristics of steel. Common alloying elements include: manganese , nickel , chromium , molybdenum , boron , titanium , vanadium , tungsten , cobalt , and niobium . Additional elements, most frequently considered undesirable, are also important in steel: phosphorus , sulphur , silicon , and traces of oxygen , nitrogen , and copper . Plain carbon-iron alloys with a higher than 2.1% carbon content are known as cast iron . With modern steelmaking techniques such as powder metal forming, it

5568-422: The desired properties. Nickel and manganese in steel add to its tensile strength and make the austenite form of the iron-carbon solution more stable, chromium increases hardness and melting temperature, and vanadium also increases hardness while making it less prone to metal fatigue . To inhibit corrosion, at least 11% chromium can be added to steel so that a hard oxide forms on the metal surface; this

5664-530: The east with Youngstown, Ohio , in the Haselton neighborhood in the west and Connellsville , Pennsylvania, to the east. It did not reach Lake Erie (at Ashtabula, Ohio ) until the formation of Conrail in 1976. The P&LE was known as the "Little Giant" since the tonnage that it moved was out of proportion to its route mileage. While it operated around one tenth of one percent of the nation's railroad miles, it hauled around one percent of its tonnage. This

5760-736: The eastern limits of the Departure Yard in Lowellville. The Hump Yard was located in Struthers in the center of the facility, and the Receiving Yard was to the west. The special purpose yards were "Diesel Servicing Facilities", "Gorilla Park" and "Interchange" yards. The "Interchange" yard was made up of six tracks, four were for interchange to and from the B&;O Railroad and two of which were for general use. The other interchange

5856-413: The final steel (either as solute elements, or as precipitated phases), impedes the movement of the dislocations that make pure iron ductile, and thus controls and enhances its qualities. These qualities include the hardness , quenching behaviour , need for annealing , tempering behaviour , yield strength , and tensile strength of the resulting steel. The increase in steel's strength compared to pure iron

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5952-648: The finest steel in the world exported to the Roman, Egyptian, Chinese and Arab worlds at that time – what they called Seric Iron . A 200 BC Tamil trade guild in Tissamaharama , in the South East of Sri Lanka, brought with them some of the oldest iron and steel artifacts and production processes to the island from the classical period . The Chinese and locals in Anuradhapura , Sri Lanka had also adopted

6048-420: The foreseeable future. 40°35′32″N 80°14′12″W  /  40.5923°N 80.2366°W  / 40.5923; -80.2366 Pittsburgh and Lake Erie Railroad The Pittsburgh and Lake Erie Railroad ( P&LE ; reporting mark PLE ), also known as the "Little Giant", was formed on May 11, 1875. Company headquarters were located in Pittsburgh, Pennsylvania . The line connected Pittsburgh in

6144-513: The form of charcoal) in a crucible, was produced in Merv by the 9th to 10th century AD. In the 11th century, there is evidence of the production of steel in Song China using two techniques: a "berganesque" method that produced inferior, inhomogeneous steel, and a precursor to the modern Bessemer process that used partial decarburization via repeated forging under a cold blast . Since

6240-599: The hardenability of thick sections. High strength low alloy steel has small additions (usually < 2% by weight) of other elements, typically 1.5% manganese, to provide additional strength for a modest price increase. Recent corporate average fuel economy (CAFE) regulations have given rise to a new variety of steel known as Advanced High Strength Steel (AHSS). This material is both strong and ductile so that vehicle structures can maintain their current safety levels while using less material. There are several commercially available grades of AHSS, such as dual-phase steel , which

6336-590: The last years of the P&LE, CSX used the line more than P&LE leading to the merger. Most of the online customers had long been gone, with only the main line still intact. In 1993 the company was purchased by CSX. The CSX designated the P&LE as a new subsidiary, the Three Rivers Railway . However, in 1993, CSX leased the TRR, and there is currently no de facto distinction between the former P&LE and any other portion of CSX's system. Presidents of

6432-439: The main production route. At the end of 2008, the steel industry faced a sharp downturn that led to many cut-backs. In 2021, it was estimated that around 7% of the global greenhouse gas emissions resulted from the steel industry. Reduction of these emissions are expected to come from a shift in the main production route using cokes, more recycling of steel and the application of carbon capture and storage technology. Steel

6528-450: The most part, however, p-block elements such as sulphur, nitrogen , phosphorus , and lead are considered contaminants that make steel more brittle and are therefore removed from steel during the melting processing. The density of steel varies based on the alloying constituents but usually ranges between 7,750 and 8,050 kg/m (484 and 503 lb/cu ft), or 7.75 and 8.05 g/cm (4.48 and 4.65 oz/cu in). Even in

6624-409: The nation's passenger rail service in 1971. P&LE operated commuter trains into Pittsburgh. In 1964, it ran one round-trip between Youngstown and Pittsburgh as well as one additional southbound and two additional northbound trains on the section between Beaver Falls and Pittsburgh. Latest by 1968, only the section between College Hill , Beaver Falls, Aliquippa and P&LE's Pittsburgh Terminal

6720-523: The notorious South Pennsylvania Railroad (South Penn). This would lead to William Henry Vanderbilt to control of the P&LE as a link in the South Penn and the building of the Pittsburgh, McKeesport and Youghiogheny Railroad . The South Pennsylvania Railroad was planned to connect to the PM&Y. Vanderbilt did this by buying Henry W. Oliver 's and the Harmony Society's stock in the P&LE. Then Vanderbilt, aided by Andrew Carnegie, advanced

6816-436: The oxidation rate of iron increases rapidly beyond 800 °C (1,470 °F), it is important that smelting take place in a low-oxygen environment. Smelting, using carbon to reduce iron oxides, results in an alloy ( pig iron ) that retains too much carbon to be called steel. The excess carbon and other impurities are removed in a subsequent step. Other materials are often added to the iron/carbon mixture to produce steel with

6912-449: The product but only locally relieves strains and stresses locked up within the material. Annealing goes through three phases: recovery , recrystallization , and grain growth . The temperature required to anneal a particular steel depends on the type of annealing to be achieved and the alloying constituents. Quenching involves heating the steel to create the austenite phase then quenching it in water or oil . This rapid cooling results in

7008-759: The production methods of creating wootz steel from the Chera Dynasty Tamils of South India by the 5th century AD. In Sri Lanka, this early steel-making method employed a unique wind furnace, driven by the monsoon winds, capable of producing high-carbon steel. Since the technology was acquired from the Tamilians from South India, the origin of steel technology in India can be conservatively estimated at 400–500 BC. The manufacture of wootz steel and Damascus steel , famous for its durability and ability to hold an edge, may have been taken by

7104-448: The railroad were as follows: After Newell the presidency would be held by the president of the NYC with the active management of the local vice president. Vice Presidents: With Nash the active management went back to the president. The P&LE's Pittsburgh passenger train station (interior seen in the lower right photo) sat adjacent the south bank of the Monongahela River at the foot of

7200-593: The river on the Beaver Bridge . From there it followed the Beaver River to just south of New Castle, Pennsylvania , where it then followed the Mahoning River west-northwest, crossing into Ohio just east of Lowellville . From there it ran northwest into Youngstown, terminating at a junction with the New York Central known as Haselton. In the table below, mileage is reckoned westbound from

7296-477: The solid-state, by heating the ore in a charcoal fire and then welding the clumps together with a hammer and in the process squeezing out the impurities. With care, the carbon content could be controlled by moving it around in the fire. Unlike copper and tin, liquid or solid iron dissolves carbon quite readily. All of these temperatures could be reached with ancient methods used since the Bronze Age . Since

7392-527: The spring of 1877, the first rails were laid down in Beaver Falls, which had the largest population other than Pittsburgh. The other reason for this was around February 1877 Jacob Henrici of the Harmony Society had business there. Henrici would also become a director in 1877. On July 6, 1877, McCreery resigned and Bennett was elected to president with Jacob Henrici becoming a director. Henrici

7488-401: The steel. At the very high cooling rates produced by quenching, the carbon has no time to migrate but is locked within the face-centred austenite and forms martensite . Martensite is a highly strained and stressed, supersaturated form of carbon and iron and is exceedingly hard but brittle. Depending on the carbon content, the martensitic phase takes different forms. Below 0.2% carbon, it takes on

7584-561: The steel. The early modern crucible steel industry resulted from the invention of Benjamin Huntsman in the 1740s. Blister steel (made as above) was melted in a crucible or in a furnace, and cast (usually) into ingots. The modern era in steelmaking began with the introduction of Henry Bessemer 's process in 1855, the raw material for which was pig iron. His method let him produce steel in large quantities cheaply, thus mild steel came to be used for most purposes for which wrought iron

7680-561: The technology of that time, such qualities were produced by chance rather than by design. Natural wind was used where the soil containing iron was heated by the use of wood. The ancient Sinhalese managed to extract a ton of steel for every 2 tons of soil, a remarkable feat at the time. One such furnace was found in Samanalawewa and archaeologists were able to produce steel as the ancients did. Crucible steel , formed by slowly heating and cooling pure iron and carbon (typically in

7776-525: The upper carbon content of steel, beyond which is cast iron. When carbon moves out of solution with iron, it forms a very hard, but brittle material called cementite (Fe 3 C). When steels with exactly 0.8% carbon (known as a eutectoid steel), are cooled, the austenitic phase (FCC) of the mixture attempts to revert to the ferrite phase (BCC). The carbon no longer fits within the FCC austenite structure, resulting in an excess of carbon. One way for carbon to leave

7872-494: The way from Pittsburgh to Youngstown. The P&LE operated as an independent subsidiary, even after New York Central and Pennsylvania Railroad merged to form Penn Central . The making of coke in Connellsville had been a big part of P&LE traffic, but by the early 20th century it had lessened. The development of by-products distillation processing of coke had moved to the Pittsburgh area. The P&LE then extended up

7968-428: The world's steel in 2023. Further refinements in the process, such as basic oxygen steelmaking (BOS), largely replaced earlier methods by further lowering the cost of production and increasing the quality of the final product. Today more than 1.6 billion tons of steel is produced annually. Modern steel is generally identified by various grades defined by assorted standards organizations . The modern steel industry

8064-586: Was a major hub location on the railroad, until the creation of Conrail. Gateway Yard was opened in October 1957, to be a modern hump yard. The yard was approximately 200 acres (0.81 km ) stretching for a distance of just over 5 miles (8.0 km) from Lowellville, Ohio to Center Street in Youngstown, Ohio. Gateway Yard was made up of three principal yards, and an assortment of smaller, special-purpose yards. The principal yards were arranged linearly, with

8160-718: Was developed in Southern India and Sri Lanka in the 1st millennium BCE. Metal production sites in Sri Lanka employed wind furnaces driven by the monsoon winds, capable of producing high-carbon steel. Large-scale wootz steel production in India using crucibles occurred by the sixth century BC, the pioneering precursor to modern steel production and metallurgy. High-carbon steel was produced in Britain at Broxmouth Hillfort from 490–375 BC, and ultrahigh-carbon steel

8256-509: Was formerly used. The Gilchrist-Thomas process (or basic Bessemer process ) was an improvement to the Bessemer process, made by lining the converter with a basic material to remove phosphorus. Another 19th-century steelmaking process was the Siemens-Martin process , which complemented the Bessemer process. It consisted of co-melting bar iron (or steel scrap) with pig iron. These methods of steel production were rendered obsolete by

8352-672: Was largely because the P&LE served the steel mills of the greater Pittsburgh area, which consumed and shipped vast amounts of materials. It was a specialized railroad, deriving much of its revenue from coal , coke , iron ore , limestone , and steel . The eventual closure of the steel mills led to the end of the P&LE as an independent line in 1992. At the end of 1970 P&LE operated 211 miles (340 km) of road on 784 miles (1,262 km) of track, not including PC&Y and Y&S; in 1970 it reported 1419 million ton-miles of revenue freight, down from 2437 million in 1944. The P&LE purchased many smaller railroads that operated in

8448-698: Was on the south bank of the Monongahela River , at the foot of the Smithfield Street Bridge . The P&LE followed the left downstream bank of the Monongahela River past the terminal to the Golden Triangle , where that waterway meets the Allegheny River and becomes the Ohio River . The railroad continued northwest along the left downstream bank of the Ohio River to the vicinity of Beaver, Pennsylvania , where it crossed

8544-438: Was produced globally, with 630,000,000 tonnes (620,000,000 long tons; 690,000,000 short tons) recycled. Modern steels are made with varying combinations of alloy metals to fulfil many purposes. Carbon steel , composed simply of iron and carbon, accounts for 90% of steel production. Low alloy steel is alloyed with other elements, usually molybdenum , manganese, chromium, or nickel, in amounts of up to 10% by weight to improve

8640-757: Was produced in the Netherlands from the 2nd-4th centuries AD. The Roman author Horace identifies steel weapons such as the falcata in the Iberian Peninsula , while Noric steel was used by the Roman military . The Chinese of the Warring States period (403–221 BC) had quench-hardened steel, while Chinese of the Han dynasty (202 BC—AD 220) created steel by melting together wrought iron with cast iron, thus producing

8736-442: Was served by one single roundtrip commuter train per day. In 1978, P&LE tried to drop that last commuter train, which was met by fierce objections. With state support, P&LE continued to operate the commuter run but eventually ended the service on July 12, 1985, after passenger counts had dropped significantly. The PATrain commuter operation continued to use some P&LE-trackage until 1989. The Youngstown Gateway Yard

8832-405: Was submitted to county voters and passed in November 1924. In January 1925 the county commissioners petitioned the court and the grand jury for authority to build the bridge and later that month made application to congress for authority to bridge the Ohio. Dravo Contracting submitted the low bid of $ 144,000 to construct four piers completed on August 13, 1926 one month ahead of schedule. The steel

8928-506: Was supplied by the Aliquippa Works for $ 609,000. The American Bridge Company charged $ 337,500. Pittsburgh and Lake Erie Railroad , which later became Conrail and CSX, paid $ 39,000 for the portion over its tracks. The total cost with approaches was $ 1.25 million - completed in record time and within estimates. It opened to the public on opened December 11, 1927. While the American Bridge Company constructed dozens bridges throughout

9024-472: Was the creation of William McCreery , a prominent Pittsburgh businessman, merchant, and railroad builder. McCreery had suffered at the hands of the Pennsylvania Railroad in a business that had a loss or failed. The Pennsylvania Railroad at the time used discriminatory rates which became a hot issue in Pittsburgh. On May 11, 1870 McCreery and ten other people filed Articles of Association with

9120-526: Was the key due to his Harmony Society ties which was a communal religious group founded in 1805. In 1880, William Henry Vanderbilt 's Lake Shore and Michigan Southern Railway bought stock to the tune of $ 200,000 in the P&LE. The P&LE would stay in the Vanderbilt's New York Central system until Conrail. Also in 1877, an agreement between the P&LE and the Atlantic & Great Western (Erie) and

9216-534: Was with New York Central Railroad which was a direct interchange. The western yard limit was the end of track for the P&LE. Beyond the western end of the Yard was the NYC mainline that continued to Ashtabula, Ohio . The yard was constructed when the P&LE was under the control of the New York Central Railroad. Conrail routing most of the traffic around P&LE facilities in the area. After

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