Kawasaki Steel Corporation

National Institute for Materials Science

Akihiko Ohta

Chiaki Shiga

Osamu Watanabe

Satoshi Nishijima

Keniti Amano

Takahiro Kubo

Kazuo Hiraoka

Yasushi Morikage

Koich Yasuda

In the present invention, an iron based alloy which contains by mass %: 0.20% or less of C; 6.0 to 16.0% of Cr; 6.0 to 16.0% of Ni and whose martensitic transformation starting temperature (Ms point temperature) is in the range of 0-170&#xb0; C., inclusive of 0&#xb0; C. and exclusive of 170&#xb0; C., is used as a welding material. With respect to a weld metal, the weld metal has a iron alloy composition which contains by mass %: 0.20% or less of C; 3.0 to 13.0% of Cr; 3.0 to 13.0% of Ni and whose martensitic transformation starting temperature (Ms point temperature) is in the range of 50-360&#xb0; C., inclusive of both 50&#xb0; C. and 360&#xb0; C.

Welding material and a method of producing welded joint

Welding material

A welding method for two members adapted to be welded and formed of a low-alloy steel for structural purposes causing the weld metal to develop martensite transformation during cooling after welding, so that the weld metal becomes expanded to a greater degree at room temperature than at a temperature at which the martensite transformation initiates. The welding material comprises a ferrous alloy containing C, Cr, Ni, Si, Mn, Mo and Nb, all of which meet substantially with the contents of the following equation (1): ##EQU1##

Welding method and welding material

Growing community of inventors

Ibaragi, Japan

Akihiko Ohta