Martensitic stainless steels for seamless steel pipe

Details Martensitic stainless steels for seamless steel pipe Martensitic stainless steels for seamless steel pipe

1996-11-29

1999-08-17

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420 40, 420 41, 420 64, C22C 3818

Patent

active

059390182

ABSTRACT:
Martensitic stainless steels that enable the fabrication of high-strength seamless steel pipe suited for use in oil-well pipe and pipeline tubing by means of a Mannesmann plug mill or Mannesmann mandrel mill process, without the formation of defects during production. The heat workability of these steels, which contain no more than 0.30% by weight of carbon and from 11 to 14% by weight of chromium, and have a ferrite content of at least 40% at 1200.degree. C., has been vastly improved by holding the phosphorus and sulfur levels therein to no more than 0.020% and 0.003% by weight, respectively.

REFERENCES:
patent: 4256486 (1981-03-01), Yoshioka et al.
patent: 4326885 (1982-04-01), Larson et al.
patent: 4420335 (1983-12-01), Takagi et al.
patent: 4461657 (1984-07-01), Rana et al.
patent: 5858128 (1999-01-01), Miyata et al.

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