Metal treatment – Compositions – Heat treating
Patent
1976-11-18
1978-01-24
Stallard, W.
Metal treatment
Compositions
Heat treating
148 12E, C21D 914
Patent
active
040702090
ABSTRACT:
A steel blank pipe is first subjected to the step of cutting off the hair crack layer portion including the black skin layer of the inner peripheral wall surface of the blank pipe. Thereafter, the steel blank pipe is repetitively subjected to the process of dilation or drawing of the length and the process of annealing within a non-oxidizing hearth.
REFERENCES:
patent: 2184624 (1939-12-01), Raab et al.
patent: 2632235 (1953-03-01), Doyle et al.
patent: 3516874 (1970-06-01), Maker et al.
patent: 3844846 (1974-10-01), Friske et al.
Stallard W.
Usui International Industry Ltd.
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