Daido Tokushuko Kabushiki Kaisha

Dadio Tokushuko Kabushiki Kaisha

Koichi Sudo

Kozo Ozaki

Masaru Nagata

Yukinori Matsuda

A high Young's modulus material comprises carbon steel or alloying steel and contains a particular amount of hard particles having a Young's modulus of not less than 24,000 kgf/mm.sup.2. Furthermore, a surface-coated tool member comprises a substrate comprised of carbon steel or alloying steel and a hard coating layer having a Young's modulus of not less than 24,000 kgf/mm.sup.2 in which the substrate contains a particular amount of hard particles having a Young's modulus of not less than 24,000 kgf/mm.sup.2.

High Young's modulus materials and surface-coated tool members using the

Disclosed is a steel for plastics molds superior in weldability. The steel consists essentially of C: 0.1 to 0.3%, Mn: 0.5 to 3.5%, Cr: 1.0 to 3.0%, Mo:0.03 to 2.0%, V:0.1 to 1.0% and S: 0.01 to 0.10%; Si: not more than 0.25%, P: not more than 0.2%, and B: not more than 0.002%; the balance being substantially Fe. The alloy composition should satisfy the following formula:

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Nagoya, Japan

Koichi Sudo