Nippon Steel Corporation

Other

Mitsubishi Jukogyo Kabushiki Kaisha

Babcock-hitachi Kabushiki Kaisha

Hisashi Naoi

Yasushi Hasegawa

Masahiro Ohgami

Toshio Fujita

Fujimitsu Masuyama

Hiroshi Ukeba

Yuuichi Satoh

Takashi Sato

Nobuo Mizuhashi

Kohji Tamura

Yoichi Matsubara

Yasusuke Inoue

Shuichi Funaki

Tetsuo Nagasaka

Masaaki Takagishi

Seiichi Akizawa

High strength, ferritic heat-resistant steel having improved resistance

High-strength ferritic heat-resistant steel and method of producing the

Liquid-phase diffusion bonding alloy foils for joining heat-resistant

Martensitic heat-resisting steel excellent in HAZ-softening resistance

A bent pipe to which external force, such as an internal pressure and a bending moment, is applied singly or in combination, characterized in that the relationship among the outside diameter D.sub.0 of the bent part, the radius of curvature R of the bent part, the outside diameter D.sub.0 of the straight part, the wall thickness T.sub.0 of the straight part, the central cross section angle .phi. of the bent part and the wall thickness t of the pipe, is in the range defined by the following equations (1) and (2): ##EQU1## whereby the bent pipe has a sectional form of high strength.

Bent pipe having sectional form of high strength

A high-nitrogen ferritic heat-resisting steel with high vanadium content comprises, in weight percent, 0.01-0.30% C, 0.02-0.80% Si, 0.20-1.00% Mn, 8.00-13.00% Cr, 0.005-1.00% Mo, 0.20-1.50% W, 0.30-2.00% V, and 0.10-0.50% N and being controlled to include less than 0.020% Nb, the balance being Fe and unavoidable impurities. A method of producing the steel comprises melting and equilibrating the steel components in an atmosphere of a mixed gas of a prescribed nitrogen partial pressure or nitrogen gas and thereafter casting or solidifying the resulting melt in an atmosphere controlled to have a total pressure of not less than 2.77 bar and a nitrogen partial pressure of not less than 1.0 bar, with the relationship between the nitrogen partial pressure p and the total pressure P being

High-nitrogen ferritic heat-resisting steel with high vanadium content

A high-nitrogen ferritic heat-resisting steel with high niobium content comprises, in weight per cent, 0.01-0.30% C, 0.02-0.80% Si, 0.20-1.00% Mn, 8.00-13.00% Cr, 0.005-1.00% Mo, 0.20-1.50% W, 0.05-1.00% V, over 0.12 up to 2.00% Nb and 0.10-0.50%N, the balance being Fe and unavoidable impurities. A method of producing the steel comprises melting and equilibrating the steel components in an atmosphere of a mixed gas of a prescribed nitrogen partial pressure or nitrogen gas and thereafter casting or solidifying the resulting melt in an atmosphere controlled to have a total pressure of not less than 2.5 bar and a nitrogen partial pressure of not less than 1.0 bar, with the relationship between the nitrogen partial pressure p and the total pressure P being

High-nitrogen ferritic heat-resisting steel with high niobium content

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Futtsu, Japan

Hisashi Naoi