Method of producing a high pressure fuel injection pipe

Metal treatment – Compositions – Heat treating

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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.

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