High toughness stainless steels and the method of producing the

Details High toughness stainless steels and the method of producing the High toughness stainless steels and the method of producing the

1990-10-10

1992-10-06

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148325, 420 70, C21D 806, C22C 3826

Patent

active

051528487

ABSTRACT:
A high toughness ferritic stainless steel having the excellent cold workability and the excellent heading workability suitable for the plastic working of screws, which consists essentially of, by weight percentage, C.ltoreq.0.03%, P.ltoreq.0.040%, S.ltoreq.0.010%, Si.ltoreq.1.0%, Mn.ltoreq.1.0%, 11.5%.ltoreq.Cr.ltoreq.22.0%, 0.05%.ltoreq.Nb.ltoreq.0.80%, N.ltoreq.0.025%, if necessary at least one selected from 0.2%.ltoreq.Cu.ltoreq.1.0%, 0.01.ltoreq.Mo.ltoreq.2.00%, 0.020%.ltoreq.Ni.ltoreq.1.50% and the balance being Fe and inevitable impurities, and the number of inclusions larger than 20 .mu.m amoung inclusions composed of carbo-nitrides of Nb, Ti and/or Zr in the steel is not more than 20. In the production of the high toughness ferritic stainless steel, the rolling material having the above-mentioned chemical compositions is heated to 1200.degree. C. or above at the rod rolling.

REFERENCES:
Japanese Industrial Standard G 0555-1977.

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