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69-537: In 1854, the mining engineer P.M. Obukhov invented a new procedure to make crucible steel . In combination with the work of metallurgist P.P. Anosov, this crucible steel proved very useful for making cannons. In 1859, this led to the founding of the Prince Michael Artillery Works in Zlatoust . In 1860, this factory delivered its first steel cannon. A reason for the failure of this company was

138-505: A crucible . Crucible steel was first developed in the middle of the 1st millennium BCE in Southern India and Sri Lanka using the wootz process. In ancient times, it was not possible to produce very high temperatures with charcoal or coal fires, which were required to melt iron or steel. However, pig iron, having a higher carbon content and thus a lower melting point, could be melted, and by soaking wrought iron or steel in

207-462: A better steel for clock springs. In Handsworth near Sheffield , he began producing steel in 1740 after years of experimenting in secret. Huntsman's system used a coke -fired furnace capable of reaching 1,600 °C, into which up to twelve clay crucibles, each capable of holding about 15 kg of iron, were placed. When the crucibles or "pots" were white-hot, they were charged with lumps of blister steel , an alloy of iron and carbon produced by

276-607: A change from massive gun barrels cast in one piece to built-up gun barrels. The idea behind the state support for the foundation of the Obukhov factory was that Russia did not want to be dependent on other nations for its artillery. Later on, it was obvious that Obukhov would make copies of the Krupp designs. But in fact, Russian orders were what led to these designs in the first place, as these orders were crucial for Krupp to expand its gun manufacturing business. The Obukhov works were

345-413: A delicately intermediate carbon fraction, and its material properties range according to the carbon percentage: high carbon steel is stronger but more brittle than low carbon steel . Crucible steel sequesters the raw input materials from the heat source, allowing precise control of carburization (raising) or decarburization (lowering carbon content). Fluxes , such as limestone , could be added to

414-424: A joint stock company led by Mr. Obukhov and aimed to produce artillery based on the Krupp examples. The factory started production in 1864. The early years of the company were very difficult. The financial base of the company was too small. What saved the company in the early years were massive advances on orders which were to be delivered. By 1864, it had received advances of 1,300,000 rubles without having delivered

483-481: A lower-carbon steel (formerly the wrought iron). This often resulted in an intricate pattern when the steel was forged, filed or polished, with possibly the most well-known examples coming from the wootz steel used in Damascus swords . The steel was often much higher in carbon content (typically ranging in the area of 1.5 to 2.0%) and in quality (lacking impurities) in comparison with other methods of steel production of

552-601: A means of efficiently changing excess wrought iron into useful steel. Huntsman's process greatly increased the European output of quality steel suitable for use in items like knives, tools, and machinery, helping to pave the way for the Industrial Revolution . Iron alloys are most broadly divided by their carbon content: cast iron has 2–4% carbon impurities; wrought iron oxidizes away most of its carbon, to less than 0.1%. The much more valuable steel has

621-577: A piece of land on the Neva that belonged to the state and founded the Obukhov Steel Works. In this, Putilov was supported by the Russian navy. In the 1860s, Russia ordered a massive amount of Krupp guns for its field, naval and coastal artillery. These were all rifled , but the first orders were for muzzle loaders, while later orders were breechloaders . Another technical innovation meant

690-552: A rich history of crucible steel production, beginning during the late 1st millennium CE. From the sites in modern Uzbekistan and Merv in Turkmenistan, there is good archaeological evidence for the large scale production of crucible steel. They all belong in broad terms to the same early medieval period between the late 8th or early 9th and the late 12th century CE, contemporary with the early crusades . The two most prominent crucible steel sites in eastern Uzbekistan carrying

759-546: A single gun. In 1864, the Russian Navy Ministry then intervened, and appointed a colonel as general manager of the Obukhov Works. Engineer Obukhov remained responsible only for making crucible steel. The shareholders accepted an agreement that limited their rights. Now about 1,200,000 rubles were spent on new machinery; and staff, that had gained experience through Krupp, was hired. The interference of

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828-567: A variation of the wootz process, after the location of the process documented by Voysey in the 1820s. The production of crucible steel in China began around the first century BC, or possibly earlier. The Chinese developed a method of producing pig iron around 1200 BC, which they used to make cast iron . By the first century BC, they had developed puddling to produce mild steel and a process of rapidly decarburizing molten cast-iron to make wrought iron by stirring it atop beds of saltpeter (called

897-514: A very hard edge, but the lower-carbon steel helped to increase the toughness, helping to decrease the chance of chipping, cracking, or breaking. In Europe, crucible steel was developed by Benjamin Huntsman in England in the 18th century. Huntsman used coke rather than coal or charcoal, achieving temperatures high enough to melt steel and dissolve iron. Huntsman's process differed from some of

966-594: Is a government-owned corporation in Russia and some other post-Soviet states . Unitary enterprises are business entities that have no ownership rights to the assets that they use in their operations. This form is possible only for state and municipal enterprises, which respectively operate state or municipal property. The owners of the property of a unitary enterprise have no responsibility for its operation and vice versa. Federal Law No. 161-ФЗ " On State and Municipal Unitary Enterprises " (amended July 13, 2015), defines

1035-493: The Almaz-Antey military industrial concern, and in 2003, it became a joint-stock company , OJSC GOZ Obukhov Plant . 59°51′44″N 30°28′38″E  /  59.862165°N 30.477211°E  / 59.862165; 30.477211 Crucible steel Crucible steel is steel made by melting pig iron ( cast iron ), iron , and sometimes steel , often along with sand , glass , ashes , and other fluxes , in

1104-529: The Heaton process , it was independently discovered by John Heaton in the 1860s). Around this time, the Chinese began producing crucible steel to convert excess quantities of cast iron and wrought iron into steel suitable for swords and weapons. In 1064, Shen Kuo , in his book Dream Pool Essays , gave the earliest written description of the patterns in the steel, the methods of sword production, and some of

1173-442: The cementation process , and a flux to help remove impurities. The pots were removed after about 3 hours in the furnace, impurities in the form of slag skimmed off, and the molten steel poured into moulds to end up as cast ingots . Complete melting of the steel produced a highly uniform crystal structure upon cooling, which gave the metal increased tensile strength and hardness in comparison with other steels being made at

1242-675: The 'pine tree design'. If you cook a fish fully and remove its bones, the shape of its guts will be seen to be like the lines on a 'snake-coiling sword'. The first European references to crucible steel seem to be no earlier than the Post Medieval period. European experiments with “ Damascus ” steels go back to at least the sixteenth century, but it was not until the 1790s that laboratory researchers began to work with steels that were specifically known to be Indian/wootz. At this time, Europeans knew of India's ability to make crucible steel from reports brought back by travellers who had observed

1311-594: The 3rd century CE, particularly in Scandinavia . Swords bearing the brand name Ulfberht , and dating to a 200-year period from the 9th century to the early 11th century, are prime examples of the technique. It is speculated by many that the process of making these blades originated in the Middle East and subsequently had been traded during the Volga Trade Route days. In the first centuries of

1380-469: The Bolshevik factory became a base for the new independent "Factory No. 185 (S.M. Kirov)". The OKMO, for a few months a part of Factory No. 174, moved at the same time to Factory No. 185. The new enterprise was also dedicated to the production of tanks, and because of its honorific is often confused with Kirov Factory . The main part of Bolshevik Factory remained focused on production of heavy artillery. On

1449-633: The Ferghana Process are Akhsiket and Pap in the Ferghana Valley, whose position within the Great Silk Road has been historically and archaeologically proved. The material evidence consists of large number of archaeological finds relating to steel making from 9th–12th centuries CE in the form of hundreds of thousands of fragments of crucibles, often with massive slag cakes. Archaeological work at Akhsiket, has identified that

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1518-626: The Indian/Sri Lankan material is as early as 300 BCE. India's iron ore had trace vanadium and other alloying elements leading to increased hardenability in Indian crucible steel which was famous throughout the middle east for its ability to retain an edge. While crucible steel is more attributed to the Middle East in early times, pattern welded swords, incorporating high-carbon, and likely crucible steel, have been discovered in Europe, from

1587-604: The Islamic period, some scientific studies on swords and steel appeared. The best known of these are by Jabir ibn Hayyan 8th century, al-Kindi 9th century, Al-Biruni in the early 11th century, al-Tarsusi in the late 12th century, and Fakhr-i-Mudabbir 13th century. Any of these contains far more information about Indian and damascene steels than appears in the entire surviving literature of classical Greece and Rome . There are many ethnographic accounts of Indian crucible steel production; however, scientific investigations of

1656-649: The United States in the 1880s, iron and carbon were melted together directly to produce crucible steel. Throughout the 19th century and into the 1920s a large amount of crucible steel was directed into the production of cutting tools , where it was called tool steel . The crucible process continued to be used for specialty steels, but is today obsolete. Similar quality steels are now made with an electric arc furnace . Some uses of tool steel were displaced, first by high-speed steel and later by materials such as tungsten carbide . Another form of crucible steel

1725-508: The assets. The term "unitary" specifies the assets as indivisible, i.e., they may not be distributed among the participants in any way. Property granted to a unitary enterprise can be sold or otherwise alienated only with the consent of the state or municipal property owner. The existence of unitary enterprises is a legacy of the Soviet era, when the state owned the means of production. The managers of state enterprises often have close ties to

1794-412: The carbon to dissolve evenly into the liquid steel and negating the prior need for extensive blacksmithing in an attempt to achieve the same result. Similarly, it allowed steel to be cast by pouring into molds. The use of fluxes allowed nearly complete extraction of impurities from the liquid, which could then simply float to the top for removal. This produced the first steel of modern quality, providing

1863-479: The carbon, a variety of organic materials are specified by the contemporary Islamic authorities, including pomegranate rinds, acorns, fruit skins like orange peel, leaves as well as the white of egg and shells. Slivers of wood are mentioned in some of the Indian sources, but significantly none of the sources mention charcoal. Crucible steel is generally attributed to production centres in India and Sri Lanka where it

1932-774: The cast iron. The third method uses wrought iron and cast iron. In this process, wrought iron and cast iron may be heated together in a crucible to produce steel by fusion. In regard to this method Abu Rayhan Biruni states: "this was the method used in Hearth". It is proposed that the Indian method refers to Wootz carburization method; i.e., the Mysore or Tamil processes. Variations of co-fusion process have been found primarily in Persia and Central Asia but have also been found in Hyderabad, India called Deccani or Hyderabad process. For

2001-426: The crucible pots and annealing furnaces to prepare each pot before firing. Ancillary rooms for weighing each charge and for the manufacture of the clay crucibles were either attached to the workshop, or located within the cellar complex. The steel, originally intended for making clock springs, was later used in other applications such as scissors, axes and swords. Sheffield's Abbeydale Industrial Hamlet operates for

2070-580: The crucible steel process was of the carburization of iron metal. This process appears to be typical of and restricted to the Ferghana Valley in eastern Uzbekistan, and it is therefore called the Ferghana Process. This process lasted in that region for roughly four centuries.. Evidence of the production of crucible steel have been found in Merv, Turkmenistan, a major city on the 'Silk Road'. The Islamic scholar al-Kindi (801–866 CE) mentions that during

2139-404: The crucible to remove or promote sulfur , silicon , and other impurities, further altering its material qualities. Various methods were used to produce crucible steel. According to Islamic texts such as al-Tarsusi and Abu Rayhan Biruni , three methods are described for indirect production of steel. The medieval Islamic historian Abu Rayhan Biruni (c. 973–1050) provides the earliest reference of

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2208-523: The enterprises themselves work on the basis of commercial accounts and of commercial legislation. They come under ministerial responsibility but are off-budget. They may be auxiliary to a ministry's activity, such as a printing house under the Ministry of Education or a production facility for police equipment under the Ministry of Internal Affairs . Unitary enterprises have a distinct legal status, different from regular market-sector corporations. Some of

2277-562: The first domestic tank, the T-18 . It later became home to the AVO-5 tank design bureau, soon named OKMO , which was responsible for the T-26 infantry tank . In 1932, the tank department of the Bolshevik factory, became the new Factory No. 174 (K.E. Voroshilov). This new, independent enterprise was dedicated to the production of T-26. Janusz Magnuski says that in 1935, one of the former departments of

2346-403: The first to use the word "wootz" in print. Another investigator, David Mushet , was able to infer that wootz was made by fusion. David Mushet patented his process in 1800. He made his report in 1805. As it happens, however, the first successful European process had been developed by Benjamin Huntsman some 50 years previously in the 1740s. Benjamin Huntsman was a clockmaker in search of

2415-418: The full diffusion of carbon throughout the liquid. With the use of fluxes it also allowed the removal of most impurities, producing the first steel of modern quality. Due to carbon's high melting point (nearly triple that of steel) and its tendency to oxidize (burn) at high temperatures, it cannot usually be added directly to molten steel. However, by adding wrought iron or pig iron, allowing it to dissolve into

2484-538: The late medieval period, 16th century. One of the earliest known potential sites, which shows some promising preliminary evidence that may be linked to ferrous crucible processes in Kodumanal , near Coimbatore in Tamil Nadu . The site is dated between the third century BCE and the third century CE. By the seventeenth century the main centre of crucible steel production seems to have been in Hyderabad. The process

2553-555: The legal status of unitary enterprises in Russia. The State Duma passed this law on October 11, 2002, and President Putin signed it on November 14, 2002. The assets of unitary enterprises belong to the federal government , to a Russian federal subject , or to a municipality. A unitary enterprise holds assets under economic management (for both state and municipal unitary enterprises) or under operative management (for state unitary enterprises only), but has limited property rights over

2622-461: The liquid pig-iron for a long time, the carbon content of the pig iron could be reduced as it slowly diffused into the iron, turning both into steel. Crucible steel of this type was produced in South and Central Asia during the medieval era . This generally produced a very hard steel, but also a composite steel that was inhomogeneous, consisting of a very high-carbon steel (formerly the pig-iron) and

2691-403: The liquid, the carbon content could be carefully regulated (in a way similar to Asian crucible-steels but without the stark inhomogeneities indicative of those steels). Another benefit was that it allowed other elements to be alloyed with the steel. Huntsman was one of the first to begin experimenting with the addition of alloying agents like manganese to help remove impurities such as oxygen from

2760-565: The main supplier of crucible steel, but over the centuries production slipped back, and by the nineteenth century just a small industry survived in the Balangoda district of the central southern highlands. A series of excavations at Samanalawewa indicated the unexpected and previously unknown technology of west-facing smelting sites, which are different types of steel production. These furnaces were used for direct smelting to steel. These are named "west facing" because they were located on

2829-411: The more the steel was heated and worked, the more it tended to decarburize , and this outward diffusion occurs much faster than the inward diffusion between layers. Thus, further attempts to homogenize the steel resulted in a carbon content too low for use in items like springs, cutlery, swords, or tools. Therefore, steel intended for use in such items, especially tools, was still being made primarily by

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2898-519: The nature and properties of wootz steel. Indian wootz engaged the attention of some of the best-known scientists. One was Michael Faraday who was fascinated by wootz steel. It was probably the investigations of George Pearson, reported at the Royal Society in 1795, which had the most far-reaching impact in terms of kindling interest in wootz amongst European scientists. He was the first of these scientists to publish his results and, incidentally,

2967-589: The navy was successful in the sense that in 1866, satisfactory models of 4-, 8-, 12- and 24-pdr guns were made, all muzzle loaders. While the Russian navy had succeeded in becoming independent for its artillery, the early Russian system for naval rifled breechloading guns remained very similar to the Prussian and early German system. In 1885, the Ministry of the Navy forced out the remaining private shareholders. During

3036-528: The ninth century CE the region of Khorasan, the area to which the cities Nishapur , Merv, Herat and Balkh belong, was a steel manufacturing centre. Evidence from a metallurgical workshop at Merv, dated to the ninth- early tenth century CE, provides an illustration of the co-fusion method of steel production in crucibles, about 1000 years earlier than the distinctly different wootz process. The crucible steel process at Merv might be seen as technologically related to what Bronson (1986, 43) calls Hyderabad process,

3105-473: The other hand, Zaloga says that in 1935, after the assassination of Sergey Kirov , the whole Bolshevik Factory No. 232 was renamed "Factory No. 185 (S.M. Kirov)", yet Leningrad inhabitants continued to refer to it as the Bolshevik Factory. The Leningrad factory's historical name was restored in 1992 by the formation of a unitary enterprise, FSUE Obukhov State Plant . In the mid-1990s, Obukhov

3174-570: The problematic transport of the guns from this factory to the end users. In 1863, the state would therefore sponsor the establishment of two new artillery factories: The Motovilikhinsk works on the navigable Kama River near Perm ; and the Obukhov-Putilov-Kudryavzev factory in St. Petersburg, later known as Obukhov. Colonel Putilov acquired a license to use Obukhov's procedure to make crucible steel in 1861. In 1863, Putilov acquired

3243-424: The process at several places in southern India. From the mid-17th century onwards, European travellers to the Indian subcontinent wrote numerous vivid eyewitness accounts of the production of steel there. These include accounts by Jean-Baptiste Tavernier in 1679, Francis Buchanan in 1807, and H.W. Voysey in 1832. The 18th, 19th and early 20th century saw a heady period of European interest in trying to understand

3312-458: The production of Damascus steel . The first, and the most common, traditional method is solid state carburization of wrought iron . This is a diffusion process in which wrought iron is packed in crucibles or a hearth with charcoal, then heated to promote diffusion of carbon into the iron to produce steel. Carburization is the basis for the wootz process of steel. The second method is the decarburization of cast iron by removing carbon from

3381-466: The public a scythe -making works, which dates from Huntsman's times and is powered by a water wheel , using crucible steel made at the site. Previous to Huntsman, the most common method of producing steel was the manufacture of shear steel . In this method, blister steel produced by cementation was used, which consisted of a core of wrought iron surrounded by a shell of very high-carbon steel, typically ranging from 1.5 to 2.0% carbon. To help homogenize

3450-450: The quality and high hardenability of the steel, it was quickly adopted for the manufacture of tool steel, machine tools, cutlery, and many other items. Because no oxygen was blown through the steel, it exceeded Bessemer steel in both quality and hardenability, so Huntsman's process was used for manufacturing tool steel until better methods, utilizing an electric arc , were developed in the early 20th century. In another method, developed in

3519-406: The reasoning behind it: Ancient people use chi kang , (combined steel), for the edge, and jou thieh (soft iron) for the back, otherwise it would often break. Too strong a weapon will cut and destroy its own edge; that is why it is advisable to use nothing but combined steel. As for the yu-chhang (fish intestines) effect, it is what is now called the 'snake-coiling' steel sword, or alternatively,

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3588-617: The remains of crucible steel production have only been published for four regions: three in India and one in Sri Lanka. Indian/Sri Lankan crucible steel is commonly referred to as wootz , which is generally agreed to be an English corruption of the word ukko (in the Canarese language) or hookoo (in the Telugu language ). European accounts from the 17th century onwards have referred to

3657-421: The repute and manufacture of "wootz", a traditional crucible steel made specially in parts of southern India in the former provinces of Golconda , Mysore and Salem. As yet the scale of excavations and surface surveys is too limited to link the literary accounts to archaeometallurgical evidence. The proven sites of crucible steel production in south India, e.g. at Konasamudram and Gatihosahalli, date from at least

3726-479: The same time that the west- facing technology was operating in Sri Lanka. Excavations of the Yodhawewa (near Mannar) site (in 2018) have uncovered a lower half of a bottom spherical furnace and crucible fragments used to make crucible steel in Sri Lanka during the 7th-8th centuries AD. The crucible fragments uncovered at the site were similar to the elongated tube-shaped crucibles of Samanalawewa. Central Asia has

3795-404: The slow and arduous bloomery process in very small amounts and at high cost, which, albeit better, had to be manually separated from the wrought iron and was still impossible to fully homogenize in the solid state. Huntsman's process was the first to produce a fully homogeneous steel. Unlike previous methods of steel production, the Huntsman process was the first to fully melt the steel, allowing

3864-408: The state agencies which established them, a situation that can lead to legal and political problems. A unitary enterprise is independent in economic issues and obliged only to give its profits to the state. Unitary enterprises have no right to set up subsidiaries, but they can, with the owner's consent, open branches and representation offices. Though government entities own the unitary enterprises,

3933-417: The steel, it was pounded into flat plates, which were stacked and forge welded together. This produced steel with alternating layers of steel and iron. The resulting billet could then be hammered flat, cut into plates, which were stacked and welded again, thinning and compounding the layers, and evening out the carbon more as it slowly diffused out of the high-carbon steel into the lower-carbon iron. However,

4002-442: The steel. His process was later used by many others, such as Robert Hadfield and Robert Forester Mushet , to produce the first alloy steels like mangalloy , high-speed steel , and stainless steel . Due to variations in the carbon content of the blister steel, the carbon steel produced could vary in carbon content between crucibles by as much as 0.18%, but on average produced a eutectoid steel containing ~ 0.79% carbon. Due to

4071-425: The time because of the use of fluxes. The steel was usually worked very little and at relatively low temperatures to avoid any decarburization , hot short crumbling, or excess diffusion of carbon. With a carbon content close to that of cast iron, it usually required no heat treatment after shaping other than air cooling to achieve the correct hardness, relying on composition alone. The higher-carbon steel provided

4140-454: The time. Before the introduction of Huntsman's technique, Sheffield produced about 200 tonnes of steel per year from Swedish wrought iron (see Oregrounds iron ). The introduction of Huntsman's technique changed this radically: one hundred years later the amount had risen to over 80,000 tonnes per year, or almost half of Europe's total production. Sheffield developed from a small township into one of Europe's leading industrial cities. The steel

4209-403: The western sides of hilltops to use the prevailing wind in the smelting process. Sri Lankan furnace steels were known and traded between the 9th and 11th centuries and earlier, but apparently not later. These sites were dated to the 7th–11th centuries. The coincidence of this dating with the 9th century Islamic reference to Sarandib is of great importance. The crucible process existed in India at

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4278-566: The whole Tsarist period, the company remained a major producer of artillery and other military equipment. On 20 June 1918, V. Volodarsky was assassinated while making his way to a meeting relating to industrial unrest in the factory. From 1922 to 1992, it was renamed Bolshevik Plant no. 232 . In the late 1920s, it became one of the two main Soviet tank factories (along with the Kharkov Locomotive Factory ), and produced

4347-417: The wootz processes in that it used a longer time to melt the steel and to cool it down and thus allowed more time for the diffusion of carbon. Huntsman's process used iron and steel as raw materials, in the form of blister steel , rather than direct conversion from cast iron as in puddling or the later Bessemer process . The ability to fully melt the steel removed any inhomogeneities in the steel, allowing

4416-603: Was a state-controlled company specialized in metallurgy and heavy machine building. Its military products included missile launching equipment, ICBM missile silos, ground equipment associated with missile systems, submarine missile launch tubes, naval guns, and submarine antenna arrays. As regards civilian products, it made castings for the electrotechnical, chemical, and shipbuilding industries. Other civilian products were fork-lift trucks, wheelchairs, smoothing irons and other home appliances, television sets, cameras, and gas and oil extraction equipment. In 2002, Obukhov became part of

4485-755: Was apparently quite different from that recorded elsewhere. Wootz from Hyderabad or the Deccani process for making watered blades involved a co-fusion of two different kinds of iron: one was low in carbon and the other was a high-carbon steel or cast iron. Wootz steel was widely exported and traded throughout ancient Europe, China, the Arab world , and became particularly famous in the Middle East, where it became known as Damascus steel. Recent archaeological investigations have suggested that Sri Lanka also supported innovative technologies for iron and steel production in antiquity. The Sri Lankan system of crucible steel making

4554-447: Was developed in 1837 by the Russian engineer Pavel Anosov . His technique relied less on the heating and cooling, and more on the quenching process of rapidly cooling the molten steel when the right crystal structure had formed within. He called his steel bulat ; its secret died with him. In the United States crucible steel was pioneered by William Metcalf . FSUE A unitary enterprise ( Russian : унитарное предприятие )

4623-528: Was partially independent of the various Indian and Middle Eastern systems. Their method was something similar to the method of carburization of wrought iron. The earliest confirmed crucible steel site is located in the Knuckles range in the northern area of the Central Highlands of Sri Lanka dated to 6th–10th centuries CE. In the twelfth century the land of Serendib (Sri Lanka) seems to have been

4692-492: Was produced in specialised workshops called 'crucible furnaces', which consisted of a workshop at ground level and a subterranean cellar. The furnace buildings varied in size and architectural style, growing in size towards the latter part of the 19th century as technological developments enabled multiple pots to be "fired" at once, using gas as a heating fuel. Each workshop had a series of standard features, such as rows of melting holes, teaming pits, roof vents, rows of shelving for

4761-539: Was produced using the so-called " wootz " process, and it is assumed that its appearance in other locations was due to long-distance trade. Only recently it has become apparent that places in Central Asia like Merv in Turkmenistan and Akhsiket in Uzbekistan were important centres of production of crucible steel. The Central Asian finds are all from excavations and date from the 8th to 12th centuries CE, while

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