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:
Dec. 14, 1982
Filed:
Feb. 08, 1980
Keizo Onishi, Muroran, JP;
Takao Adachi, Muroran, JP;
Akiyoshi Fuji, Muroran, JP;
Ryuichi Chiba, Muroran, JP;
Katsuyuki Naitoh, Yokohama, JP;
Hachiro Okada, Tokyo, JP;
Japan Steel Works, Ltd., Kanagawa, JP;
Chiyoda Chem. Engineering & Construction Co., Kanagawa, JP;
Abstract
A method for overlay welding of stainless steel on the inner surfaces of pressure vessels as used for treating hydrogen at elevated temperature, e.g. below 450.degree. C. and under high pressure, e.g. below 150 kg/cm.sup.2, is provided wherein, in order to prevent the disbonding of the welded stainless steel, as the 1st layer weld overlay including martensitic structure of 4 to 40% by area or additionally including ferritic structure of up to 8% by area is used. For this purpose the chemical composition of the stainless steel weld metal is defined as essentially comprising of up to 0.1% C, up to 1.0% Si, up to 2.0% Mn, 7 to 12% Ni, 12 to 18% Cr, up to 1.0% Mo, and up to 0.1% Al, the balance being Fe. The stainless steel weld overlay may further include Nb of above 8 times the carbon content but up to 1.0%.