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PRECIPITATION HARDENING TYPE FERRITE-FREE STAINLESS STEEL
PRECIPITATION HARDENING TYPE FERRITE-FREE STAINLESS STEEL
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机译:沉淀硬化型无铁素体不锈钢
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摘要
PURPOSE:To obtain a stainless steel with superior resistance to corrosion and fatigue due to sea water by adding specified percentages of C, Si, Mn, Ni, Cr, Cu, Mo, Nb, Al, N, B and Y to Fe and by specifying the ferrite content. CONSTITUTION:A steel consisting of 0.01-0.06% C, =1% Si, =1% Mn, 3.80- 4.80% Ni, 15.0-16.0% Cr, 3.0-4.0% Cu, 0.30-1.00% Mo, 0.2-0.6% Nb, =0.05% Al, 0.01-0.04% N, 0.001-0.050% B and/or 0.005-0.050% Y and the balance Fe with inevitable impurities and satisfying Nb/(C+N)=3.0 is prepared. The steel is subjected to soln. heat treatment at about 1,000-1,500 deg.C to cause martensitic transformation. Thus, a precipitation hardening type stainless steel having a structure contg. =3% delta-ferrite and =5% austenite is obtd.
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