| 摘要 |
PURPOSE:To remarkably improve the stress and corrosion cracking resistance of a two-phase stainless steel tube by performing hot rolling of a seamless tube stock at a temp. between two phases temp. of austenite and ferrite. CONSTITUTION:A two-phase stainless steel stock is rolled within the range of two phases of alpha+gamma. Hence, the austenitic phases elongated by rolling remain in parallel in the rolling direction as they are and ferritic phases exist separately between the austenitic phases. As for a tube having such a structure, even if stress corrosion cracks are generated, crack propagation is stopped by the austenitic phases not to develop into through cracks in the thickness direction.
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