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1. (WO1999007910) HIGH-STRENGTH, NOTCH-DUCTILE PRECIPITATION-HARDENING STAINLESS STEEL ALLOY

Pub. No.:    WO/1999/007910    International Application No.:    PCT/US1998/015839
Publication Date: Fri Feb 19 00:59:59 CET 1999 International Filing Date: Fri Jul 31 01:59:59 CEST 1998
IPC: C22C 38/50
Applicants: CRS HOLDINGS, INC.
Inventors: MARTIN, James, W.
Title: HIGH-STRENGTH, NOTCH-DUCTILE PRECIPITATION-HARDENING STAINLESS STEEL ALLOY
Abstract:
A precipitation hardenable, martensitic stainless steel alloy is disclosed consisting essentially of, in weight percent, about: C 0.03 max, Mn 1.0 max, Si 0.75 max, P 0.040 max, S 0.020 max, Cr 10 - 13, Ni 10.5 - 11.6, Ti 1.5 - 1.8, Mo 0.25 - 1.5, Cu 0.95 max, Al 0.25 max, Nb 0.3 max, B 0.010 max, N 0.030 max, Ce 0.001 - 0.025, the balance essentially iron. The disclosed alloy provides a unique combination of stress-corrosion cracking resistance, strength, and notch toughness even when used to form large cross-section pieces. A method of making such an alloy includes adding cerium during the melting process in a amount sufficient to yield an effective amount of cerium in the alloy product.