The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 17, 1989
Filed:
Jan. 20, 1987
Mitsubishi Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention is concerned with a high-strength Ni-based alloy excellent in resistance to stress corrosion cracking in high-temperature high-pressure water, characterized by consisting essentially of, in terms of weight ratio, 0.08% or less of C, 0.15% or less of Si, 0.1 to 1% of Mn, 15% or less of Fe, 20 to 30% of Cr, 3.5% or less of Ti, 2% or less of Al, 7% or less of Nb and the balance of Ni, having at least one of a .gamma.' phase and a .gamma.' phase in a .gamma. base, and semicontinuously predominantly precipitating M.sub.23 C.sub.6 in grain boundaries; a method for preparing this high-strength Ni-based alloy by heating and maintaining the alloy having the identical composition at 980.degree. to 1,200.degree. C., cooling it, and subjecting it once or more to an aging treatment of additionally heating and maintaining it at 550.degree. to 850.degree. C.; a method for preparing the aforesaid alloy by heating and maintaining the alloy having the identical composition at 980.degree. to 1,200.degree. C., cooling it, subjecting it to a cold working at a 10% or more reduction of area, and subjecting it once or more to an aging treatment of additionally heating and maintaining it at 550.degree. to 850.degree. C.; and a method for preparing the aforesaid alloy by subjecting the alloy having the identical composition to a hot working at 850.degree. to 1,250.degree. C. at a draft percentage of 20% or more, heating and maintaining the alloy at 980.degree. to 1,200.degree. C., cooling it, and subjecting it once or more to an aging treatment of additionally heating and maintaining it at 550.degree. to 850.degree. C.