Method of making high strength, tough alloy steel

Details Method of making high strength, tough alloy steel Method of making high strength, tough alloy steel

1978-09-14

1979-10-09

Steiner, Arthur J.

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148134, 148 36, 148 38, C21D 122

Patent

active

041704991

ABSTRACT:
A high strength, tough alloy steel, particularly suitable for the mining industry, is formed by heating the steel to a temperature in the austenite range (1000.degree.-1100.degree. C.) to form a homogeneous austenite phase and then cooling the steel to form a microstructure of uniformly dispersed dislocated martensite separated by continuous thin boundary films of stabilized retained austenite. The steel includes 0.2-0.35 weight % carbon, at least 1% and preferably 3-4.5% chromium, and at least one other subsitutional alloying element, preferably manganese or nickel. The austenite film is stable to subsequent heat treatment as by tempering (below 300.degree. C.) and reforms to a stable film after austenite grain refinement.

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McMahon et al., "Development of Economically Tough, Ultra-High-Strength Fe-Cr-C Steels," Proc. Third Intern. Conf. on Strength of Metals and Alloys, Cambridge, Inst. Met., 1973, 1, p. 180.

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