Method of making seam free welded pipe

Details Method of making seam free welded pipe Method of making seam free welded pipe

1997-11-12

2000-08-15

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148592, 148519, C21D 810

Patent

active

061030279

ABSTRACT:
A process for forming a cylindrical pipe from a welded metal pipe stock by roll extruding and annealing whereby the weldment microstructure forming the seam is essentially reformed to provide a recrystallized grain structure which is substantially homogeneous with the parent material of the pipe stock.

REFERENCES:
patent: 3222905 (1965-12-01), Ernestus
patent: 3274814 (1966-09-01), Dilling
patent: 3411334 (1968-11-01), Ernestus
patent: 3728782 (1973-04-01), Ziemek
patent: 4114431 (1978-09-01), Monkelbaan
patent: 4736607 (1988-04-01), Wochnik

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