MARTENSITIC STAINLESS STEEL SEAMLESS STEEL TUBE EXCELLENT IN MACHINABILITY AND HOT WORKABILITY

摘要

PROBLEM TO BE SOLVED: To provide a martensitic stainless steel seamless steel tube excellent in machinability and also having excellent hot workability in a Mannesman's rolling method.;SOLUTION: This martensitic stainless steel seamless steel tube excellent in machinability and hot workability has a composition containing, by mass, 0.001 to 0.05% C, ≤0.5% Si, 0.1 to 1.5% Mn, ≤0.03% P, 0.01 to 0.04% S, 10 to 14% Cr, 2 to 8% Ni, 0.5 to 3% Mo, 0.5 to 3% Cu, ≤0.2% Al, 0.001 to 0.05% N, 0.0005 to 0.02% B and ≤0.005% O and further containing, if required, one or more kinds selected from 0.001 to 0.01% Ca, 0.0005 to 0.01% Mg, 0.001 to 0.05% rare earth metals, 0.01 to 0.05% Zr, 0.005 to 0.05% Ti, 0.05 to 0.5% Nb, 0.05 to 0.5% V and 0.5 to 3% W, and the balance Fe with inevitable impurities.;COPYRIGHT: (C)2001,JPO