Hot creeping breaking strength and are superior in ductility the martensite type heat resistant alloy and the production manner

摘要

PROBLEM TO BE SOLVED: To provide a martensitic heat resistant alloy which has excellent hot workability and ductility as well as oxidation resistance, and further has high temperature creep rupture strength at a high temperature for a long time.;SOLUTION: (A) The martensitic heat resistant alloy has a composition containing, by weight, 0.03 to 0.15% C, 0.01 to 0.9% Si, 0.01 to 1.5% Mn, 8.0 to 13.0% Cr, 0.0005 to 0.015% Al, ≤2.0% Mo, ≤4.0% W, 0.05 to 0.5% V, 0.01 to 0.2% Nb, 0.1 to 5.0% Co, 0.008 to 0.03% B and 0.005% N, and the balance Fe with inevitable impurities. (B) In the alloy, the contents of Mo, W, B are N by weight% satisfy the following inequalities of (1) and (2): B-0.772N0.007 (1); and W+1.916Mo-16.99B2.0 (2).;COPYRIGHT: (C)2002,JPO