FINE-GRAIN MARTENSITE STAINLESS STEEL AND METHOD FOR PRODUCING IT Russian patent published in 2008 - IPC C22C38/58 C21D8/00 

FIELD: metallurgy, namely fine-grain iron-base martensite alloys with number of grain according to ASTM no less than five, method for producing such alloys.

SUBSTANCE: alloy contains, mass%: carbon, approximately from 0.05 till 0.5; chrome, at least 5; nickel, at least 0.5; cobalt, no more than 15; copper, no more than 8; manganese, no more than 8; silicon, no more than 4; molybdenum and tungsten, no more than 6; titanium, no more than 1.5; vanadium, no more than 3; niobium, no more than 1.7; aluminum, no more than 0.2; zirconium less than 2; tantalum, less than 4; hafnium, less than 4; nitrogen, less than 0.1; each component of group containing calcium, cerium, magnesium, scandium, yttrium, lanthanum, beryllium and boron, less than 0.1; each component of group containing sulfur, phosphorus, tin, antimony, oxygen and lead, less than 0.1; iron, at least approximately 40. Method comprises steps of producing alloy, subjecting it to hot working at temperature more than 800°C till real deformation exceeding 7.5%; cooling alloy till 20°C.

EFFECT: improved mechanical properties and corrosion resistance of alloy.

101 cl, 3 dwg, 2 tbl, 2 ex