High strength seamless steel pipe excellent in...

Details High strength seamless steel pipe excellent in... High strength seamless steel pipe excellent in...

2005-03-25

2008-08-26

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S330000, C148S335000

Reexamination Certificate

active

07416617

ABSTRACT:
A high strength seamless steel pipe having mgh yield stress and excellent hydrogen-induced cracking resistance, comprises by mass %, C:0.03-0.11%, Si:0.05-0.5%, Mn:0.8-1.6%, p:0.025% or less, S:0.003% or less, Ti:0.002-0.017%, Al:0.001-0.10%, Cr:0.05-0.5%, Mo:0.02-0.3%, V:0.02-0.20%, Ca0.0005-0.005%, N:0.008% or less and O (Oxygen):0.004% or less, the balance Fe and impurities. The steel microstructure is bainite and/or martensite and ferrite is precipitated at grain boundaries. The seamless steel pipe can contain at least one of Cu:0.05-0.5% and Ni:0.05-0.5%. To produce the pipe, it is desirable to limit a starting temperature of quenching after rolling, a cooling rate and a tempering temperature.

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