C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/22 (2006.01)
Patent
CA 2462320
The present invention is related to a steel product, particularly a steel product such as a seamless steel tube, with high mechanical resistance and an excellent resistance to the cracking caused by tension in the media containing hydrogen sulfides. The chemical composition of the steel used allows to obtain a product with high mechanical resistance and high cracking resistance caused by tension in media containing hydrogen sulfides and with high fracture toughness. The invention is characterized by the fact that to manufacture it a low alloy steel bar is used with the following composition, in % by weight, apart from Fe: C between 0.20 and 0.26; P a maximum of 0.02; S a maximum of 0.005; Mo between 0.40 and 0.85; Cr between 0.90 and 1.10; Al between 0.01 and 0.05; Mn between 0.3 and 0.5 of Mn; maximum hydrogen when casting of 2 ppm, Cu +8 Sn . <= 30%; Si + Mn <= 0.9%. Total maximum O, 20 ppm and total maximum N 80 ppm; and because it comprises a heat treatment consisting in a double quenching and tempering or a double quenching followed by one tempering.
Morales Arturo
Tivelli Marco
Algoma Tubes Inc.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
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