DUAL-PHASE STAINLESS STEEL EXCELLENT IN DRILLING PROPERTY AND HAVING HIGH TOUGHNESS AND HIGH CORROSION FATIGUE STRENGTH

摘要

PROBLEM TO BE SOLVED: To provide a dual-phase stainless steel used, e.g. for barrel material for suction roll for paper making, having superior corrosion resistance, toughness, corrosion fatigue strength, etc., and excellent in drilling property. ;SOLUTION: This dual-phase stainless steel has a composition which consists of ≤0.04 C, 0.2-2.0% Si, 0.2-2.0% Mn, 23.0-25.0% Cr, 5.0-6.5% Ni, 1.0-2.0% Mo, ≤0.9% Cu, 0.03-0.08% N,0.5-2.0% W, and the balance essentially Fe and in which (Cr equivalent)/(Ni equivalent) is regulated to 2.0-2.3. Further, the amount of ferrite in the dual-phase structure is regulated to 70-85area%.;COPYRIGHT: (C)1997,JPO