Welded steel pipe steel and welded steel pipe having good wear

Details Welded steel pipe steel and welded steel pipe having good wear Welded steel pipe steel and welded steel pipe having good wear

1995-10-04

1996-07-23

Bryant, III, James E.

Pipes and tubular conduits

Distinct layers

138143, 138DIG6, 148337, 428544, F16L 1116

Patent

active

055380441

ABSTRACT:
Welded steel pipe having wear resistance properties, corrosion resistance and low-temperature toughness is provided by preparing welded steel pipe formed of composite steel material comprised of an outer layer of high-carbon, low-alloy steel and an inner layer having a relatively low carbon content, heating the pipe to a temperature that is not less than 800.degree. C. and not more than 900.degree. C. and then quenching the pipe so as to harden just the high-carbon outer layer, and if necessary this can be followed by reheating at a temperature of not less than 200.degree. C. and not more than 600.degree. C. to thereby produce a pipe with an inner layer having high corrosion resistance and low temperature toughness and an outer layer having high hardness.

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patent: 4943489 (1990-07-01), Kuhara et al.
patent: 5265793 (1993-11-01), Usui et al.
patent: 5275893 (1994-01-01), Miyasaka et al.

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