High strength austenite steel having excellent cold work hardenability

摘要

Disclosed herein is high strength austenitic steel having excellent cold work hardenability, consisting essentially of the following elements:PPC . . . 0.1-0.3 wt. %;P PSi . . . up to 1.5 wt. %;PPMn . . . 16-22 wt. %; P P Cr . . . 14-18 wt. %;PPV . . . 0.8-1.7 wt. %; PP N . . . 0.3-0.6 wt. %;PPNi . . . below 0.8 wt. %; andPPFe and inevitable impurities . . . balance, PPwith a proviso that the C-, N- and V-contents satisfy the following inequalities:PPC+N-(V/10)≧0.4 wt. %; andPP C+N+V/5≧0.75 wt. %.PPThe above austenitic steel may further contain at least one element selected from the group consisting of 0.05-1.0 wt. % of Ti and 0.05-1.0 wt. % of Nb. The above high strength austenitic steel has an extremely high 0.2% proof stress, exhibits excellent resistance to stress corrosion cracking and good hot workability, and maintains its non-magnetic properties.