C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
75/15, 148/48
C21D 1/22 (2006.01)
Patent
CA 1143186
ABSTRACT OF THE DISCLOSURE A high strength, tough alloy steel is formed by heating the steel to a temperature in the austenite range (1000-1100°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 substantial alloying element, preferably manganese or nickel. The austenite film is stable to subsequent heat treatment as by tempering (below 300°C) and reforms to a stable film after austenite grain refinement. The steel alloys of the present invention are particularly useful in mining oper- ations (e.g., buckets for mining, comminution, and other mineral processing operations).
309921
Rao Bangaru V.n.
Thomas Gareth
Smart & Biggar
The Regents Of The University Of California
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