Method for making seamless pipe

Details Method for making seamless pipe Method for making seamless pipe

1977-01-05

1977-08-23

DiPalma, Victor A.

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

29417, 295264, 29DIG47, 164 76, 164 85, B22D 11126, B22D 11128

Patent

active

040430235

ABSTRACT:
A method for making seamless pipe from molten premium steel which is cast by a centrifugal process into hollow billets. The billets are then outer diameter turned, cut to length, and bored. By such centrifugal casting followed by machining, the inner diameter is formed in the billet without a piercing operation. The turning and boring also remove normal impurities in the billet. The billet is then heated and hot extruded in reduction ratios of high magnitude, from about 5 to 1 up to about 60 to 1 for converting large grain castings into fine grain size forgings or cold worked material.

REFERENCES:
patent: 1607475 (1926-11-01), Otto
patent: 1945087 (1934-01-01), Siegle
patent: 3490135 (1970-01-01), Stein
patent: 3625276 (1971-12-01), Considine
patent: 3672038 (1972-06-01), Lombard
patent: 3698070 (1972-10-01), Sejournet et al.
patent: 3780555 (1973-12-01), Balthazar et al.
patent: 3927450 (1975-12-01), Sommer et al.

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