Heat-treatment of semifinished product-sliding surface of shapin

Details Heat-treatment of semifinished product-sliding surface of shapin Heat-treatment of semifinished product-sliding surface of shapin

1981-02-12

1982-09-07

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 315, C23F 704

Patent

active

043482414

ABSTRACT:
A shaping ferrous metal member used in a metal-working apparatus is heat-treated at about 1,000.degree. C. for several hours in an incompletely burning fuel gas, to provide a burned gas atmosphere composed of 0.5 to 5.0% of CO, 8 to 12% of CO.sub.2, 0 to 0.5% of O.sub.2. A tough iron oxide layer of high quality is tightly deposited with a uniform thickness by said heat-treatment on the surface of shaping metal member which is abrasively contacted by a sliding semifinished metal product. The advantageous effect of this method is that a consumable shaping metal member has a life 2 to 4 times longer than that of a metal member which is conventionally heat-treated in a completely-burning fuel gas.

REFERENCES:
patent: 2073501 (1937-03-01), Stargardter
patent: 2269943 (1942-01-01), Kiser
patent: 2543710 (1951-02-01), Schmidt et al.
patent: 3526550 (1970-09-01), Larson et al.
patent: 4035200 (1977-07-01), Valentijn

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