SINTERED STAINLESS STEEL AND PRODUCTION PROCESS THEREFOR

摘要

SINTERED STAINLESS STEEL AND PRODUCTION PROCESS THEREFOR A sintered stainless steel and sintered seamless steel pipe exhibiting improved resistance to stress corrosion cracking are disclosed. The metallurgical structure comprises a matrix phase and a dispersing phase, which are different from each other in their metallurgical structures, the matrix phase comprising a substantially single ferritic structure, and the dispersing phase comprising a structure selected from the group consisting of an austenitic structure, an austenitic + ferritic dual phase structure, an austenitic + martensitic dual phase structure, and an austenitic + ferritic + martensitic triple phase structure. The sintered seamless stainless steel pipes are useful as heat exchanging tubes and piping to which sea water or industrial water is fed.