Martensite-ferritic stainless steel and products and manufacturing processes using martensite-ferritic stainless steel

摘要

The present invention comprises (all by weight percent) 0.005-0.030% C, 0.10-0.40% Si, 0.20-0.80% Mn, up to 0.020% P, 0.005% S maximum, 13-15% Cr, 4.0-6.0% Ni, 2.0-4.5% Mo, 0.01-0.10% V 0.01 to 0.50% Nb, 0.001 to 0.070% N, 0.001 to 0.060% Al, 0.001 to 0.050% Ti, 0.01 to 1 High corrosion resistance martensite with the balance chemical composition comprising 50% Cu, up to 0.005% O, and Fe, and inevitable impurities from acceptable industrial holdings -Relating to ferritic stainless steel. Furthermore, the martensitic-ferritic stainless steel of the present invention has a local corrosion parameter defined by the following equation of 3.2-6.2. LCP = 0.500 ×% Cr + 1.287 ×% Mo + 1.308 ×% N-5.984 The present invention also includes a produced product comprising the martensite-ferritic stainless steel of the present invention, forged, or With respect to the process for the production of seamless pipes from rolled parts or steel bars and this inventive martensite-ferritic stainless steel, the process of the invention has a heating temperature in a determined step according to the following equation: . Tproc-16.9 ×% Cr-49.9 ×% Mo 535