Process for manufacturing corrosion resistant chromium steel

Details Process for manufacturing corrosion resistant chromium steel Process for manufacturing corrosion resistant chromium steel

1985-03-01

1986-09-09

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148121, 148 12E, 148 12EA, 148135, 148 2, H01F 100

Patent

active

046107347

ABSTRACT:
The corrosion resistant chromium steel which includes 3 to 45% chromium, 0.2 to 5% nitrogen and other elements. Its structure contains at least 50% ferromagnetic structure components. It is directly magnetizable and, at 400.degree. C., has a yield strength of R.sub.p0.2 >400 N/mm.sup.2 and, at 600.degree. C., a yield strength of R.sub.p0.2 >250 N/mm.sup.2. To produce this chromium steel, a prealloy containing at least 50% ferromagnetic structure components is nitrogen enriched under pressure, is then hot worked, then annealed at 800.degree. to 1250.degree. C. and finally cooled to room temperature. A tempering treatment at 450.degree. to 750.degree. C. may follow.

REFERENCES:
patent: 3836406 (1974-09-01), Yoda
patent: 3943010 (1976-03-01), Hartline
patent: 4047981 (1977-09-01), Arnold et al.

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