Heat treatment process of high-carbon chromium-nickel heat-resis

Details Heat treatment process of high-carbon chromium-nickel heat-resis Heat treatment process of high-carbon chromium-nickel heat-resis

1977-02-02

1978-04-25

Satterfield, Walter R.

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148 12E, 148 38, 75128R, C21D 400

Patent

active

040861074

ABSTRACT:
The present invention relates to a heat treatment process of high-carbon chromium-nickel heat-resistant stainless steels for the purpose of improving the creep rupture strength of the steel at temperatures over about 800.degree. C particularly at about 1000.degree. C.
The feature of the present invention lies in that heat-resistant stainless steels containing 0.2 - 1.5% C, 15 - 40% Cr, 10 - 50% Ni, 5% or less Si, 15% or less Mn, with the balance Fe, and impurities are heated for 1 to 60 minutes in a temperature range from 1280.degree. C to 1350.degree. C and then quenched to room temperature at cooling rates higher than 200.degree. C/min. in order to produce the eutectic carbide structure consisted of the matrix metal and carbide phases in which M.sub.7 C.sub.3 -type carbide is contained not less than 25% by weight of the total weight of the carbides, that are present in the said eutectic carbide structure, at grain boundary triple points, along grain boundaries and within grains.

REFERENCES:
patent: 3235417 (1966-02-01), Roy et al.
patent: 3459539 (1969-08-01), Eiselstein et al.
patent: 3762913 (1973-10-01), Boyko et al.
patent: 3826689 (1974-07-01), Ohta et al.
patent: 3865581 (1975-02-01), Sekino et al.
patent: 3871928 (1975-03-01), Smith et al.

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