Manufacturing process for high temperature carburized case harde

Metal treatment – Compositions – Heat treating

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148319, C21D 900

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active

047739479

ABSTRACT:
A case hardening steel which consists essentially of 0.03-0.2 wt % of C, 1.0-3.0 wt % of Si, 0.2-2.0 wt % of Mn, 0.05-0.5 wt % of V and the balance of Fe. The primary advantage of this steel is fineness of grain size after carburizing at relatively high temperatures. Even when carburizeed at or above 950.degree. C., the grain size number is not smaller than 6 in both the hardened case and the core. Optionally the steel may contain up to 2.0 wt % of Ni, up to 2.0 wt % of Cr and/or up to 0.5 wt % of Mo for the reinforcing purpose, and/or up to 0.1 wt % of Al, up to 0.3 wt % of Ti, up to 0.1 wt % of Zr, up to 0.03 wt % of N and/or up to 0.5 wt % of Nb+Ta for the purpose of depressing the grain growth.

REFERENCES:
patent: 3661656 (1972-05-01), Jarleborg
patent: 3897618 (1975-08-01), Church
patent: 4119443 (1978-10-01), Abe et al.
patent: 4157258 (1979-06-01), Philip et al.
patent: 4358317 (1982-11-01), Abe
Cuddy et al., Metallurgical Transactions A, "Austenite Grain Coarsening in Microalloyed Steels", vol. 14A, Oct. 1983, pp. 1989-1995.
T. Gladman, et al., Journal of the Iron and Steel Institute, "Grain-Coarsening of Austenite", Jun. 1967, pp. 653-664.

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