Steel pipe with good magnetic properties and method of...

Details Steel pipe with good magnetic properties and method of... Steel pipe with good magnetic properties and method of...

2011-05-17

2011-05-17

Sheehan, John P (Department: 1736)

Metal treatment

Stock

Magnetic

C148S120000, C148S520000

Reexamination Certificate

active

07942984

ABSTRACT:
A steel pipe blank having a composition containing 0.5% or less C and 85% or more Fe in terms of mass percent is heated, and stretch-reducing is then performed so that the diameter decrease ratio is 15% or more and the rolling finishing temperature is (the Ar3transformation point−10)° C. or lower. Consequently, a structure in which the ratio of X-ray diffraction intensity obtained from the plane in which the <100> direction of crystal grains is preferentially oriented parallel to the circumference direction and the <011> direction of crystal grains is preferentially oriented parallel to the rolling direction of the steel pipe to that obtained for a three-dimensionally randomly oriented sample is 3.0 or more is formed, and the r-value is increased, thereby improving the magnetic properties of the steel pipe.

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