Combined mechanical and thermal processing method for production

Details Combined mechanical and thermal processing method for production Combined mechanical and thermal processing method for production

1976-10-20

1978-02-21

Stallard, W.

Metal treatment

Compositions

Heat treating

C21D 908

Patent

active

040750418

ABSTRACT:
A molten steel, which may optionally contain boron to increase hardenability is poured into ingot molds, bloomed and primary hot worked to a mother tube of intermediate cross-section. Before being cooled down to below about 800.degree. C, the mother tube is reheated to about 930.degree. C, scale from the outside surface thereof is removed, and it is secondary hot worked to a pipe of final dimensions with a reduction, measured in terms of equivalent strain as expressed by the following formula, of not less than .epsilon. = 0.02 for the removal of scale from the inside surface of the pipe. It is then directly quenched to produce a finished seamless steel pipe having far better shape at a higher heat efficiency than in the conventional process. Better toughness is effected when the degree of secondary hot work is not smaller than .epsilon. = 0.20.

REFERENCES:
patent: 1450699 (1923-04-01), Morse et al.
patent: 3979231 (1976-09-01), Gondo et al.

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