Patent
Alloy steel with superior strength and toughness and its manufacture
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TLDR
In this paper, the authors proposed to enhance the strength and toughness of an Ni-contg. alloy steel by lowering the contents of C, Si, Mn, etc., and carrying out specified heat treatment to form martensite single-phase structure.Abstract:
PURPOSE: To enhance the strength and toughness of an Ni-contg. alloy steel by lowering the contents of C, Si, Mn, etc. of the steel, adding Mo, Ti, etc., and carrying out specified heat treatment to form martensite single-phase structure. CONSTITUTION: An alloy steel contg. 0.05W0.3% C, <0.1% Si, <0.1% Mn, 6.0W 12.0% Ni, 0.5W5.0% Mo, 0.1W2.0% Ti and 0.1W2.0% Al or further contg. 1.0W 8.0% Co is subjected to solubilizing treatment at ≥800°C to dissolve the Mo, Ti or Co in the matrix metal. The treated steel is cooled at ≥5°C/min cooling rate to form martensite single-phase structure, and then it is tempered at 100W700°C to provide high strength, toughness and weldability comparable to those of maraging steel. The lowered contents of C, Mn, Si, etc. result in enhanced toughness, and insufficient strength due to the lowered C content is compensated for by the precipitation of alloying elements such as Mo and Ti. COPYRIGHT: (C)1981,JPO&Japioread more
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