Hitachi Metals, Ltd.

Atushi Kumagai

Toshio Okuno

Yoshihiro Minagi

Katuaki Fukushima

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

A piston ring material is capable of improving the heat resistance, abrasion resistance, nitriding characteristics and scuffing resistance that are required in a piston ring, the C content is 0.6 to 1.5%, and Co is contained in high Cr steel. The piston ring material consists by weight of 0.6 to 1.5% C, not more than 1.0% Si, not more than 1.0% Mn, 7.0 to 25.0% Cr, 2.0 to 13.0% Co, and the balance Fe and incidental impurities. In the piston ring material, a part of Fe can be replaced by at least one kind of Mo and W, and/or V, Nb, or Ni. A piston ring has a nitrided layer provided at least on a sliding surface thereof which slides against a cylinder wall.

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Yonago, Japan

Atushi Kumagai