Method of heat treatment of stainless steel

Details Method of heat treatment of stainless steel Method of heat treatment of stainless steel

2003-02-17

2009-12-01

King, Roy (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S597000, C148S625000, C148S633000, C148S712000, C148S663000, C432S011000, C432S128000, C432S133000

Reexamination Certificate

active

07625455

ABSTRACT:
A method of heat treating stainless steel in the form of blanks, piping, tubing, strip, or wire-like material, after rolling the material, and in a heat treatment furnace at a temperature higher than about 900° C. The material is subjected to a preheating stage and a final heating stage, wherein in the preheating stage flames from burners are directed toward the surface of the material to impinge on the surface. Burners situated in the preheating stage are supplied with a fuel that burns with the aid of an oxidizing gas that contains gaseous oxygen. The material is held in the preheating stage long enough to obtain at least some degree of oxidation on the surface of the material, and the material is heated further in a following, final heating stage by burners situated in a furnace and that are supplied with a fuel and an oxidizing gas.

REFERENCES:
patent: 5360202 (1994-11-01), Adachi
patent: 5783000 (1998-07-01), Axelsson et al.
patent: 6183246 (2001-02-01), Le Gouefflec
patent: 6652681 (2003-11-01), Delabroy et al.
patent: WO 95/24509 (1995-09-01), None

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