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Bulat steel (8479 views - Material Database)

Bulat is a type of steel alloy known in Russia from medieval times; regularly being mentioned in Russian legends as the material of choice for cold steel. The name булат is a Russian transliteration of the Persian word fulad, meaning steel. This type of steel was used by the armies of nomadic peoples. Bulat steel was the main type of steel used for swords in the armies of Genghis Khan, the great emperor of the Mongolian Empire. The technique used in making wootz steel has been lost for centuries and the bulat steel used today makes use of a more recently developed technique.
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Bulat steel

Bulat steel

Bulat is a type of steel alloy known in Russia from medieval times; regularly being mentioned in Russian legends as the material of choice for cold steel. The name булат is a Russian transliteration of the Persian word fulad, meaning steel. This type of steel was used by the armies of nomadic peoples. Bulat steel was the main type of steel used for swords in the armies of Genghis Khan, the great emperor of the Mongolian Empire. The technique used in making wootz steel has been lost for centuries and the bulat steel used today makes use of a more recently developed technique.[citation needed]

History

The secret of bulat manufacturing was lost by the beginning of the 19th century. It is known that the process involved dipping the finished weapon into a vat containing a special liquid of which spiny restharrow extract was a part (the plant's name in Russian, stalnik, reflects its historical role), then holding the sword aloft while galloping on a horse, allowing it to dry and harden against the wind.[1]

Pavel Anosov eventually managed to duplicate the qualities of that metal in 1838, when he completed ten years of study into the nature of Damascus steel swords.

Anosov had entered the Saint Petersburg Mine Cadet School in 1810, where a Damascus steel sword was stored in a display case. He became enchanted with the sword, and was filled with stories of them slashing through their European counterparts. In November 1817, he was sent to the factories of Zlatoust mining region in the southern Urals, where he was soon promoted to the inspector of the "weapon decoration department".

Here he again came into contact with Damascus steel of European origin (which was in fact pattern welded steel, and not at all similar[2][3][4]), but quickly found that this steel was quite inferior to the original from the Middle East. Anosov had been working with various quenching techniques, and decided to attempt to duplicate Damascus steel with quenching. He eventually developed a methodology that greatly increased the hardness of his steels.

Bulat became popular in cannon manufacturing, until the Bessemer process was able to make the same quality steels for far less money.

Structure

Carbon steel consists of two components: pure iron, in the form of ferrite, and cementite or iron carbide, a compound of iron and carbon. Cementite is very hard and brittle; its hardness is about 640 by the Brinell hardness test, whereas ferrite is only 200. The amount of the carbon and the cooling regimen determine the crystalline and chemical composition of the final steel. In bulat, the slow cooling process allowed the cementite to precipitate as micro particles in between ferrite crystals and arrange in random patterns. The color of the carbide is dark while steel is grey. This mixture is what leads to the famous patterning of Damascus steel.

Cementite is essentially a ceramic, which accounts for the sharpness of the Damascus (and bulat) steel. Cementite is unstable and breaks down between 600–1100 °C into ferrite and carbon, so working the hot metal must be done very carefully.

See also


AlGaAlnico알루미늄알루미늄 합금알루미늄 청동Aluminium-lithium alloyArsenical bronzeArsenical copperBell metal베릴륨베릴륨구리Billon (alloy)BirmabrightBismanol비스무트황동청동Calamine brass주철Chinese silver크로뮴Chromium hydride코발트Colored goldConstantan구리Copper hydrideCopper–tungstenCorinthian bronzeCrown goldCunife백동Cymbal alloysDevarda's alloy두랄루민Dutch metal호박금ElinvarFernicoFerroalloy페로세륨FerrochromeFerromanganeseFerromolybdenumFerrosiliconFerrotitaniumFerrouraniumField's metalFlorentine bronzeGalfenolGalinstan갈륨Gilding metal유리GlucydurGuanín (bronze)GunmetalHepatizonHiduminiumHydronalium인듐InvarIron–hydrogen alloyItalmaKanthal (alloy)KovarMagnalium마그네슘ManganinMegalliumMelchior (alloy)머큐리MolybdochalkosMuntz metal니크롬니켈양은노르딕 골드OrmoluPhosphor bronze선철Pinchbeck (alloy)플라스틱Plexiglas플루토늄칼륨Rhodite로듐Rose's metal사마륨스칸듐Shakudō나트륨Speculum metalSpiegeleisenStaballoy스테인리스강강철StelliteStructural steel주석 (원소)타이타늄TombacTumbaga우라늄Vitallium우드 합금Y alloy아연지르코늄Crucible steel41xx steel다마스쿠스 강MangalloyHigh-speed steelMushet steelMaraging steelHigh-strength low-alloy steelReynolds 531Electrical steelSpring steelAL-6XNCelestriumAlloy 20Marine grade stainlessMartensitic stainless steelSanicro 28Surgical stainless steelZeron 100Silver steelTool steelWeathering steelWootz steel땜납TerneType metalElektron (alloy)아말감Magnox (alloy)AlumelBrightrayChromelHaynes InternationalInconelMonelNicrosilNisilNickel titaniumMu-metal퍼멀로이SupermalloyNickel hydridePlutonium–gallium alloy나크Mischmetal리튬Terfenol-DPseudo palladiumScandium hydrideSamarium–cobalt magnetArgentium sterling silverBritannia silverDoré bullionGoloidPlatinum sterlingShibuichi스털링 실버Tibetan silverTitanium Beta CTitanium alloyTitanium hydrideGum metalTitanium goldTitanium nitride배빗메탈Britannia metal퓨터Queen's metalWhite metalUranium hydrideZamakZirconium hydride수소헬륨붕소질소산소플루오린메테인Mezzanine원자제철소

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