The Japan Steel Works, Ltd.

Chiyoda Chem. Engineering & Construction Co.

Katsuyuki Naitoh

Takao Adachi

Ryuichi Chiba

Akiyoshi Fuji

Keizo Onishi

Hachiro Okada

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%.

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Yokohama, Japan

Katsuyuki Naitoh