Patent ID: 6312532
Filing Date: 2001-11-06
Classification: C21D,C22C

Abstract:
A ferrite-austenite steel alloy having good warm workability, high resistance to crevice corrosion and good structural stability, comprising in weight %:C maximum 0.05%;Si maximum 0.8%;Mn 0.30-4.0%;Cr 27.0-35.0%;Ni 3.0-10.0%;Mo 0-2.0%;N 0.30-0.40%;Cu 0.5-3.0%W 3.0-4.0%;S maximum 0.010%; andbalance Fe and normally occurring steel making additions for deoxidization and hot ductility;wherein %Mo+0.5% W is less than 3.52 and %Cr+3.3(%Mo+0.5% W) +16N is 41-44 and the alloy comprises 30-70 volume % ferrite and the balance austenite.