Steel member for use under hot or warm conditions and method for

Details Steel member for use under hot or warm conditions and method for Steel member for use under hot or warm conditions and method for

1998-01-30

1999-11-16

Turner, Archene

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428212, 428336, 428698, 428469, 4272551, 4272552, C23C 828

Patent

active

059854286

ABSTRACT:
The steel member for use under hot or warm conditions has a surface layer including (a) an oxygen-containing mixture layer comprising iron sulfide particles and iron nitride particles and substantially satisfying 0.5.ltoreq.S/N.ltoreq.10; (b) an intermediate layer of iron sulfide, iron nitride and iron oxide; (c) and a nitride layer comprising a nitrogen-diffused layer on this order from the member surface. The member is produced by supplying a colorless ammonium sulfide solution and a yellow ammonium sulfide solution at a weight ratio of 6/1-1/1 to a gas generator to form a solution mixture from which a head gas is generated; disposing a steel member in a reactor; introducing the head gas and nitrogen into the reactor at 100-600 ppm of H.sub.2 S and 0.1-1.0% of NH.sub.3 ; supplying nitrogen and NH.sub.3 to the reactor to adjust the concentration of NH.sub.3 to 10-70% in the reactor; heating the reactor to 460-600.degree. C. to carry out a gas sulfonitriding treatment on the member; and slowly cooling the sulfonitrided member at 30-25.degree. C./hr.

REFERENCES:
patent: 5187017 (1993-02-01), Hatano et al.
patent: 5595612 (1997-01-01), Dingremont
patent: 5869195 (1999-02-01), Ramanarayanan et al.

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