TOOL STEEL Russian patent published in 2008 - IPC C22C38/32 

FIELD: metallurgy.

SUBSTANCE: invention concerns metallurgy field. Particularly it concerns steel composition which is used for manufacturing hot working tool. Steel contains carbon, silicon, manganese, chrome, tungsten, molybdenum, vanadium, cobalt, niobium, nitrogen, cerium, calcium, boron, tellurium, titanium, antimony and iron at following ratio, wt %: carbon 0.4-0.6, silicon 0.6-1.0, manganese 0.6-1.0, chrome 4.0-5.0, tungsten 1.0-1.5, molybdenum 1.0-1.5, vanadium 0.5-1.0, cobalt 0.5-0.8, niobium 0.5-1.0, nitrogen 0.05-0.07, cerium 0.05-0.1, calcium 0.005-0.01, boron 0.1-0.2, tellurium 0.001-0.002, titanium 2.1-2.2, antimony 0.001-0.002, iron is the rest.

EFFECT: increasing of steel heat-resistance.

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