Misplaced Pages

#42957

78-646: It is of all- steel construction chambered in 9×19mm Parabellum and 7.65×21mm Parabellum . It was used from 1949 to 1975 by the Swiss Army and police units. It was also adopted by the Military of Denmark in 1949 (as M/49 Neuhausen or simply Neuhausen) and was replaced by the SIG P320 in 2019, and in 1951 by the German Bundespolizei and in shooting sports. The pistols were decommissioned by

156-471: A P were made for police and for private use, running from P 8001 to P 8250 (1951) and P 50004 (1949) to P 79150 (1975). Serial numbers from P 79600 to P 97950 are private models made by SIG Sauer, Switzerland, during 1976–1984, and P 300001 to P 331536 were made by Sig Sauer ( Swiss Arms ) during 1983–2006; the jump to the 300000s range marks the transition from traditional forged frames to CNC production. During 1966–1969, SIG produced

234-412: 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

312-516: A P added to the rear of a serial number that starts with an A have been sold by the Swiss army to civilians. A stamped "P" (="privat") on the front of the trigger guard shows that a weapon was left as a gift to the owner upon leaving the Armed Services. Serial numbers 6001 to 6028 are prototypes made during 1938–1947. 6033 to 6406 are early model SP47/8 made in 1947. Serial numbers with

390-713: 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 ,

468-444: 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

546-508: A feature first documented by the 1441 seal. In the early 20th century, Eckernförde was known for its harbour, fishing, trade in agricultural products, and manufacture of salt and iron goods. All German Navy submarines form part of 1st Ubootgeschwader and are stationed in Eckernförde. It is the home of BEHN , an alcoholic beverage family company, founded in 1792. The headquarters of SIG Sauer are also located there. Schools in

624-428: 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

702-445: 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

780-759: A more aggressive and modern look. The design was derived from Charles Petter 's Modèle 1935A pistol . In 1937, Schweizerische Industrie Gesellschaft (SIG) acquired a license for the Petter–Browning system from SACM in order to develop a replacement for the Luger Parabellum 06/29 , which had been in service since 1900. Apparently not satisfied with the Petter Browning design or the changes they had made to it, SIG evaluated no fewer than 11 prototypes from 1942 through 1944. Selbstladepistole Neuhausen model 44/16 pistol production began in 1944. Some of

858-412: 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

SECTION 10

#1732772624043

936-534: 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

1014-517: A small number of special heavy frame P210-5 models for the National Match team. These are extremely rare, with a total of 46 pieces known in literature. In the 1970s, these heavy frame models were commercialized and offered on the market, with 100 pieces of P210-6 heavy frame pistols (P 76521 to P76620) made in 1979, and 50 pieces of P210-6 heavy frame pistols, made for Hofmann & Reinhart of Zürich (P 79101 to 79150). These pistols represent

1092-453: 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

1170-672: 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

1248-403: 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

1326-403: 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

1404-453: 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

1482-408: 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

1560-535: 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

1638-691: 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

SECTION 20

#1732772624043

1716-514: 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

1794-551: 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

1872-520: 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

1950-434: 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

2028-400: 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

2106-457: 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

2184-698: Is stamped "P m/49", and also known as "P210-DK". First issued beginning in 1950 to the Danish Army Technical Corps (stamped "HTK"), this remained the standard sidearm in the Danish military throughout 60 years of continuous use, since the 2010s being replaced with the SIG Sauer P320 X-5 Carry . In 1957, the civil designation (SP47/8) was definitively changed to P210 according to the company nomenclature policy. Model P210-1 in retrospect covers all models produced until 1965,

2262-441: 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

2340-547: 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

2418-498: 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

SIG P210 - Misplaced Pages Continue

2496-655: 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

2574-599: 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

2652-607: 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

2730-445: 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

2808-475: 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

2886-529: The 1980s and 1990s. P210-7 was a rarely produced .22lr rimfire model, made in the 1950s and 1960s. In 2000, SIG sold all divisions, with the exception of the "Packaging Machines" division. The "Small Arms" division was taken over by the Lüke & Ortmeier Group and renamed SAN Swiss Arms AG. SAN Swiss Arms AG continued production of the P210 for private customers until 2006. From 2010, a new model, dubbed P210 Legend

2964-528: The 2010 Shot Show in Las Vegas, Nevada. The P210 Carry is a pistol chambered in 9x19 Parabellum with a capacity of 8+1. The P210 Carry is lighter and smaller than the original P210 featuring an alloy frame and a 4.1 inch barrel instead of the 4.7 inch barrel on the original P210. It also differs because it has new additions such as the front slide serrations, the Nitron finish, and the black Hogue G10 grips, for

3042-608: 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

3120-483: The Danish army ( Danish Defence designation Pistol M/1949 ). The 47/8 model supported the easy change of the barrels between 7.65 and 9mm Parabellum and a kit to convert to .22 caliber (see table below). SIG M/1949 is the 47/8 model purchased for the Danish military and issued version for officers, military police , and special forces, chambered in 9mm Luger. Usually called only Neuhausen in Denmark, this model

3198-470: 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

SIG P210 - Misplaced Pages Continue

3276-710: The Swiss Army and replaced by the SIG Sauer P220 (Swiss Army designation Pistole 75 ) developed in 1975. Swiss production of the P210 continued until 2006. A new model, the P210 Legend , was introduced by SIG Sauer GMBH of Germany in 2010, and another, the P210A , was introduced by SIG Sauer Inc. of New Hampshire in the United States in 2017. In 2022, Sig Sauer released the P210 Carry originally debuted at

3354-533: The addition of heat. Twinning Induced Plasticity (TWIP) steel uses a specific type of strain to increase the effectiveness of work hardening on the alloy. Eckernf%C3%B6rde Eckernförde ( German: [ɛkɐnˈføːɐ̯də] ; Danish : Egernførde , sometimes also Egernfjord ; Low German : Eckernför , sometimes also Eckernföör ) is a city located in the Kreis of Rendsburg-Eckernförde , Schleswig-Holstein , northern Germany. Situated on

3432-436: 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

3510-471: 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

3588-494: 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

3666-521: 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

3744-593: The city include the Richard-Vosgerau-Schule. The Richard Vosgerau School is a public elementary school in Eckernförde. The address is 26 Bergstraße, 24340 Eckernförde. The current head of the school is Mrs. Koepke. The school building consists of a white main house and a small outbuilding as well as a football field and a sports hall. In the schoolyard, the school children enjoy various activities, ranging from slides to climbing. Other schools in Eckernförde include: The Kiel–Flensburg railway runs through

3822-519: The coast of the Baltic Sea , approximately 30 km north-west of Kiel , it has a population of about 23,000. Eckernförde is a popular tourist destination. The name of Eckernförde is of mixed origin, but derived from the name of a Danish castle formerly located near the current town, which is also reflected in the name of the town district of Borby. This fortification is listed in the 13th century Liber Census Daniæ as Ykærnæburgh. In 1441,

3900-555: The designation P210-2 refers to the standard model as produced from 1966 (beginning with serial nr. P 59071). P210-3 was a police version produced from 1951 to 1964 (serial nrs. P 6791 to P 6840 and P 8001 to P 8893), produced in limited numbers for the cantonal police forces of Basel, Lausanne, and Glarus, with a handful sold on the private market. P210-4 was the model made for the German border guard (serial nrs. D 1 to D 6500). P210-5 and P210-6 were civilian target shooting models made in

3978-422: 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

SECTION 50

#1732772624043

4056-413: 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

4134-648: 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

4212-513: 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

4290-599: 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

4368-439: 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

4446-450: 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

4524-690: The original Petter Browning features had been retained, specifically the self-contained firing and recoil systems. The Neuhausen 44/16 had a magazine capacity of 16 rounds. Development was slowed by the Second World War . After testing various experimental models (such as the aforementioned 44/16 with a double-column magazine), the 47/8 model was adopted in Oct 1948 as the Pistole Modell 1949 ( P49 ), and SP47/8 for civilian market. Some previous series were tested by Swedish sport shooters and by

4602-436: 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

4680-436: The pinnacle of SIG pistol manufacture and are extremely sought after by collectors, and consequently almost never offered on the open market. Another special edition is numbered JP 1 to JP 500 (1978, "125 Years of SIG" anniversary edition). P 555001 to P 555555 are special collectors' edition of 555 sets of five chromed pistols with gilded controls, P210, P220 , P225 , P226 and P230 , made for Vonbank AG in 1987 to 1990), at

4758-449: 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

SECTION 60

#1732772624043

4836-759: 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

4914-432: The right side of the slide, running from 7695 (1951) to 35383 (1962). The rare P210-7 .22lr calibre versions have numbers in the range 40501 (1957) to 41762 (1968). 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 is one of the most commonly manufactured materials in

4992-477: 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

5070-401: 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

5148-561: 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

5226-561: 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

5304-480: The time sold for CHF 12,950. In 1991, another special edition numbered № 0001 to № 1991 was made to commemorate "700 Years of Swiss Confederation" ( 700 Jahre Eidgenossenschaft ), at the time sold for CHF 4,100 per piece. Serial numbers starting with a D belong to the Bundesgrenzschutz issues (D 1 to D 6500). The Danish m/49 pistols have their own serial numbers, without a leading letter, engraved on

5382-475: The town used an official seal listing its name as Eherneborgh . The first syllable corresponds to the modern Danish word "egern" meaning squirrel while "-förde" is Low German meaning fjord . The -förde ending is documented in Latinized form on two official seals used by the town in 1602 and 1624. The etymology of the town's name is reflected in the presence of a squirrel in the town's coat of arms,

5460-420: The town with trains stopping at Eckernförde station , situated to the west of the town centre. The town's main bus station, central omnibus station (German: ZOB ), is directly connected to the train station. The operating company of the railway network is Deutsche Bahn . Eckernförde has 4 bus routes for urban connections operated by single-deck buses. Eckernförde has no trams or trolley-buses. For transportation,

5538-525: 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

5616-428: 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

5694-409: 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

5772-718: 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

5850-509: 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

5928-522: Was made by SIG Sauer, GMBH of Eckernförde , Germany. This model was exported to the USA until 2017, when SIG Sauer Inc. of New Hampshire began production of its own model, dubbed P210A, made in Exeter, N.H., offered in two versions, Standard (210A-9-B) and Target (210A-9-TGT). Serial numbers starting A are the Swiss army ordnance models. Army models run from serial number A 100001 to A 213110. Those that have

6006-438: 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

6084-757: 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

#42957