CORROSION-RESISTANT STEEL OF MARTENSITE CLASS AND ITEM MADE OUT OF THIS STEEL Russian patent published in 2009 - IPC C22C38/50 

FIELD: metallurgy.

SUBSTANCE: invention refers to iron and steel metallurgy, particularly to compositions of corrosion-resistant high-carbon steel of martensite class, and also to items produced out of this steel. Steel contains carbon, silicon, manganese, chromium, molybdenum, vanadium, sulphur, phosphorus, nickel, copper, nitrogen, titanium, iron and unavoidable impurities at the following ratio of components, wt %: carbon 0.70-0.75, silicon 0.20-1.20, manganese 0.20-1.0, chromium 15.0-17.0, molybdenum 0.50-0.80, vanadium 0.10-0.20, nickel 0.15-0.30, copper 0.10-0.30, nitrogen 0.01-0.07, titanium 0.01-0.10, sulphur 0.001-0.010, phosphorus 0.015-0.030, iron and unavoidable impurities - the rest. The following ratios are maintained: Cr/C=22-24 and Cr_equiv/Ni_equiv=0.75-0.90, where Cr_equiv=%Cr+1.5·%Si+4·%Ti+Mo+2·%V, and Ni_equiv=%Ni+0.5·%Mn+Cu+30·%C+N.

EFFECT: increased hardness, wear resistance, and processability at maintaining corrosion resistance in mediums of average corrosion activity.

5 cl, 2 tbl