Seamless steel pipe and manufacturing method thereof

Details Seamless steel pipe and manufacturing method thereof Seamless steel pipe and manufacturing method thereof

2008-01-25

2010-10-19

Wyszomierski, George (Department: 1793)

Metal treatment

Stock

Ferrous

C420S109000

Reexamination Certificate

active

07815755

ABSTRACT:
The present invention relates to the following seamless steel pipes excellent in strength, toughness and weldability, particularly suitable for submarine flow lines, and a manufacturing method thereof. An as-quenched seamless steel pipe having a chemical composition consisting of, by mass%, C: 0.03 to 0.08%, Mn: 0.3 to 2.5%, Al: 0.001 to 0.10%, Cr: 0.02 to 1.0%, Ni: 0.02 to 1.0%, Mo: 0.02 to 0.8%, Ti: 0.004 to 0.010%, N: 0.002 to 0.008%, Ca: 0.0005 to 0.005%, and the balance Fe and impurities, with not more than 0.25% of Si, not more than 0.05% of P, not more than 0.005% of S, less than 0.005% Nb, and less than 0.0003% of B as the impurities, and having a microstructure consisting of not more than 20 volume% of polygonal ferrite, not more than 10 volume% of a mixed microstructure of martensite and retained austenite, and balance bainite. B can be 0.0003 to 0.001%. Mg and/or REM can be contained. The manufacturing method is characterized by the cooling rate during quenching.

REFERENCES:
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English translation of Takeshi—JP 2000-104117, published Apr. 2000, 27 pages total.

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