Method of continuously heat-treating steel sheet or strip

Details Method of continuously heat-treating steel sheet or strip Method of continuously heat-treating steel sheet or strip

1978-05-02

1980-03-04

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148 12C, 148 123, 148 36, C21D 948, C22C 4102

Patent

active

041916000

ABSTRACT:
Cold-rolled steel sheet or strip (e.g. containing max. 0.15% C., max. 0.60% Mn, max. 0.020% Si, and 0.001-0.050% B) is heated to a temperature higher than its recrystallization temperature and then cooled by immersion in an aqueous bath at above 75.degree. C.
The cooling by immersion consists of two successive stages, in the first of which cooling occurs at a rate of 25.degree.-180.degree. C./s to 200.degree.-425.degree. C., the product of the cooling rate v in .degree. C./s times the sheet or strip thickness e in mm being greater than 25, and in the second of which v is 90.degree.-500.degree. C./s and v times e is at least 35. Optionally a further annealing or overageing step comprises holding at 275.degree.-525.degree. C. for 30-250 s.

REFERENCES:
patent: 3839095 (1974-10-01), Kubotera et al.
patent: 3865645 (1975-02-01), Takahashi et al.
patent: 3902927 (1975-09-01), Pernstal
patent: 3917494 (1975-11-01), Kubotera et al.
patent: 3920487 (1975-11-01), Gondo et al.
patent: 3951696 (1976-04-01), Gondo et al.
patent: 3988173 (1976-10-01), Kawano
patent: 3988174 (1976-10-01), Kawano
patent: 4026729 (1977-05-01), Nakaoka et al.
patent: 4040873 (1977-08-01), Nakaoka
patent: 4065329 (1977-12-01), Paulus et al.

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