Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Consolidation of powder prior to sintering
Patent
1985-03-11
1986-04-08
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Consolidation of powder prior to sintering
419 49, 419 68, 148 38, 148136, 75128W, 75246, B22F 100
Patent
active
045812020
ABSTRACT:
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.
REFERENCES:
patent: 3859086 (1975-01-01), Church et al.
patent: 3940269 (1976-02-01), Bergstrom
patent: 4435483 (1984-03-01), Anslund
Kudo Takeo
Tarutani Yoshio
Lechert Jr. Stephen J.
Sumitomo Metal Industries Ltd.
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