Method of manufacturing case-hardened parts with little distorti

Details Method of manufacturing case-hardened parts with little distorti Method of manufacturing case-hardened parts with little distorti

1996-01-22

1997-01-21

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148318, 148319, C22C 3800

Patent

active

055956106

ABSTRACT:
A manufacturing method of case-hardened parts whose chemical components comprising especially Fe, C, Si, Mn, S, Ni, Mo, Al, V and N including a step of the heat treatment 1 in which, after carburizing, carbonitriding or carburizing followed by carbonitriding steel is cooled gradually at a temperature less than 100.degree. C./minute, by another step of the heat treatment 2, in which steel is heated to a temperature higher than the Ac.sub.3 transformation point and less than 850.degree. C. and kept at the above temperature before quenching, or after keeping at the temperature, is cooled down to a level not below 600.degree. C. before quenching, or quenching is done after cooling down to and keeping the temperature not below 600.degree. C. is disclosed. This method makes the surface layer a mixture of martensite and retained austenite. Thus the case hardened steel products of high precision and high strength are obtainable.

REFERENCES:
patent: 2260249 (1941-10-01), Harder
patent: 4157258 (1979-06-01), Philip et al.
patent: 4495004 (1985-01-01), Grilli et al.
patent: 4913749 (1990-04-01), Hengerer et al.
patent: 4971634 (1990-11-01), Shibata et al.
William C. Leslie, "The Physical Metallurgy of Steels, McGraw-Hill Book Company", 1981.
Leslie, W. C., The Physical Metallurgy of Steels, 1981, pp. 256-266.

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