Patent ID: 7942984
Filing Date: 2011-05-17
Classification: C21D,C22C,H01F

Abstract:
1. A steel pipe with good magnetic properties comprising a composition containing less than 0.01% C and 95% or more Fe in terms of mass percent, has a structure in which a ratio of X-ray diffraction intensity from 1) a plane in which the <100> direction of crystal grains is mostly oriented parallel to a circumference direction and the <011> direction of crystal grains is mostly oriented parallel to a rolling direction of the steel pipe to 2) a three-dimensionally randomly oriented sample is 3.0 or more, and has a maximum relative permeability of 2500 or more and a magnetic flux density under a magnetic field condition with a magnetizing force of 200 A/m of 0.8 T or more.