Hitachi Metals, Ltd.

Yoshihiro Minagi

Toshihiro Uehara

Kenichi Inoue

Etsuo Fujita

Toshio Okuno

Atushi Kumagai

Katuaki Fukushima

Disclosed is a ferritic Fe&mdash;Cr&mdash;Ni&mdash;Al alloy having excellent oxidation resistance and high strength, which consists essentially of, by mass, 0.003 to 0.08% C, 0.03 to 2.0% Si, not more than 2.0% Mn, from more than 1.0% to not more than 8.0% Ni, from not less than 10.0% to less than 19.0% Cr, 1.5 to 8.0% Al, 0.05 to 1.0% Zr, and the balance of Fe and incidental impurities, wherein an F value is not less than 12% and an S value is not more than 25%, where the F value is defined by the following equation (1) and the S value is defined by the following equation (2): (1) F&equals;&minus;34.3C&plus;0.48Si&minus;0.012Mn&minus;1.4Ni&plus;Cr&plus;2.48Al, and (2) S&equals;Ni&plus;Cr&plus;Al. The Fe&mdash;Cr&mdash;Ni&mdash;Al alloy, after an annealing heat treatment at 600 to 1050&deg; C., has 0.2% yield strength of 550 to 1,000 MPa by a tensile test at room temperature.

Ferritic Fe-Cr-Ni-Al alloy having exellent oxidation resistance and high strength and a plate made of the alloy

Strain-induced type martensitic steel having high hardness and having high fatigue strength

A high fatigue strength metal band saw backing material of the present invention comprises 0.27 to 0.40% of C, not more than 0.35% of Si, 0.3 to 1.2% of Mn, 0.45 to 0.75% of Ni, more than 3.0% to 4.5% of Cr, 1.5 to 2.3% of one or two of Mo and W in terms of 'Mo+W/2', 0.03 to 0.2% of one or two of V and Nb in terms of 'V+Nb/2', in terms of percent by weight, the balance Fe and inevitable impurities. The metal band saw can maintain its high fatigue strength even if it is subjected to heat treatment under the same conditions as those for high speed steel used as an edge material and thus exhibits excellent properties as a metal band saw backing material.

High fatigue strength metal band saw backing material

Growing community of inventors

Yasugi, Japan

Yoshihiro Minagi