Mitsubishi Heavy Industries Limited

Iwami Ishihara

Takayuki Kawano

Takashi Inami

Fujimitsu Masuyama

Nobuhiko Nishimura

Nobuyoshi Komai

Tomomitsu Yokoyama

Tamao Takatsu

Akira Notomi

Kaneyasu Ishikawa

Toshiaki Nishio

Tetsuji Yamaguchi

Takayuki Maeda

Mitsushige Kumou

Masakazu Matsui

Ryoji Miki

Yoshimi Onitsuka

Yuichi Kojima

A powder material for powder plasma build-up welding which exhibits excellent resistance and bending properties comprises C in an amount of 0.06 to 0.15% (% by weight, the same hereinafter), Si in an amount of 0.2 to 1.0%, Mn in an amount of 0.2 to 1.0%, Cr in an amount of 17 to 30%, Nb in an amount of 0.6 to 1.5%, Ni in an amount of not more than 0.5%, and the balance consisting of Fe and unavoidable impurities.

Powder material for powder plasma overlaying and powder plasma overlaying metal

This invention relates to welding materials for high-Cr steels which exhibit higher toughness and improved creep characteristics. Specifically, this invention relates to a welding material for high-Cr steels which contains, on a weight percentage basis, 0.03 to 0.12% C, up to 0.3% Si, 0.2 to 1.5% Mn, up to 0.02% P, up to 0.01% S, 8 to 13% Cr, 0.5 to 3% Mo, up to 0.75% Ni, 0.15 to 0.3% V, up to 0.01% Nb, 0.05 to 0.3% Ta, 0.1 to 2.5% W, 0.01 to 0.75% Cu, up to 0.03% Al, 0.002 to 0.005% B, up to 0.015% N, and up to 0.01% O, the balance being Fe and incidental impurities. It also relates to such welding materials wherein W is optionally excluded from the aforesaid composition, wherein W is excluded and 0.1 to 3% Co is added, or wherein 0.1 to 3% Co is added to the aforesaid composition.

Welding materials for high-Cr steels

This invention provides a welding material for low chromium (Cr) ferritic heat-resisting steel having high toughness, wherein the chemical composition of welding metal comprises, in weight %, carbon (c) 0.04-0.1%, silicon (Si) 0.1-0.6%, manganese (Mn) 0.1-0.6%, phosphorus (P) 0.0005-0.03%, sulfur (S) 0.0005-0.015%, chromium (Cr) 1.75-2.5%, nickel (Ni) 0.01-0.8%, molybdenum (Mo) 0.05-1.5%, vanadium (V)0.01-0.5%, tungsten (W) 0.05-2%, niobium (Nb) 0.01-0.2%, tantalum (Ta) 0.01-0.5%, aluminum (Al) 0.003-0.05%, boron (B) 0.0001-0.01%, nitrogen (N) 0.003-0.03%, and the remainder comprises iron and inevitable impurities. The welding material satisfies the following formula: C+Cr/20+Mo/15+V/10+W/7+5B.ltoreq.0.8%. According to this invention, the welding material is suitable for welding low Cr ferritic heat-resisting steels having high strength such as those used in steam generators and heat exchangers of boilers, etc. which are exposed to high temperatures and high pressures, more particularly, at a high temperature of 500.degree. C. or more.

Welding material for low chromium (Cr) ferritic steel having high

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Nagasaki, Japan

Iwami Ishihara