Jfe Steel Corporation

Toshihiro Kasamo

Yoshimasa Funakawa

Kunio Fukuda

Tomohiro Ishii

Susumu Satoh

Takumi Ujiro

Atsushi Miyazaki

Mineo Muraki

Yoshihiro Ozaki

Katsuhiro Kobori

Shuji Okada

Toshimitsu Nagaya

Setsuo Kakihara

A ferritic stainless steel sheet for a water heater with excellent corrosion resistance of welds and toughness includes, in terms of mass %, 0.020% or less of C, 0.30 to 1.00% of Si, 1.00% or less of Mn, 0.040% or less of P, 0.010% or less of S, 20.0 to 28.0% of Cr, 0.6% or less of Ni, 0.03 to 0.15% of Al, 0.020% or less of N, 0.0020 to 0.0150% of O, 0.3 to 1.5% of Mo, 0.25 to 0.60% of Nb, and 0.05% or less of Ti, the remainder being composed of Fe and unavoidable impurities, and the ferritic stainless steel sheet satisfying the following formulae (1) and (2):25&#x2266;Cr+3.3Mo&#x2266;30&#x2003;&#x2003;(1)0.35&#x2266;Si+Al&#x2266;0.85&#x2003;&#x2003;(2)wherein Cr, Mo, Si, and Al represent the content (mass %) of Cr, Mo, Si, and Al, respectively.

Ferritic stainless steel sheet for water heater excellent in corrosion resistance at welded part and steel sheet toughness

A martensitic stainless steel sheet which is hard to be softened by tempering caused by heating during the use of a disk brake, can maintain the predetermined hardness, and has excellent punching workability, bending workability before quenching, and a particularly small shear drop, and in which a predetermined hardness after quenching is constantly achieved, in a low carbon martensitic stainless steel sheet used only after quenching. Specifically, the sheet contains, on the basis of mass percent, 0.030% to 0.100% C; 0.50% or less of Si; 1.00% to 2.50% Mn; more than 10.00% to 15.00% Cr; at least one selected from the group consisting of 0.01% to 0.50% Ti, 0.01% to 0.50% V, 0.01% to 1.00% Nb, and 0.01% to 1.00% Zr; N in an amount defined by the following expression, N: 0.005% to (Ti+V)&#xd7;14/50+(Nb+Zr)&#xd7;14/90; and the balance being Fe and incidental impurities.

Low carbon martensitic stainless steel and method for production thereof

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Tokyo, Japan

Toshihiro Kasamo