Nippon Steel Corporation

Tnk Sanwa Precision Co., Ltd.

Jiro Tominaga

Hidehiko Sumitomo

Jun Nakatsuka

Hiroshi Yada

Wataru Murata

Takanori Nakazawa

Masahiro Ito

Yoshiaki Kanai

Wataru Shinada

Mitsuo Honda

A non-magnetic cold-deformed stainless steel usable for electronic equipment parts has a Vickers hardness number after cold forming of not less than 400 and a magnetic permeability of not more than 1.01. The steel has excellent hot workability and is mainly used for components such as shafts and pins of VTRs and VTR cassette tapes.

Non-magnetic high hardness austenitic stainless steel

A high-tension high-toughness steel excellent in resistance to delayed fracture which consists essentially of 0.15 to 0.50% of C, up to 1.50% of Si, 0.20 to 1.50% of Mn, up to 2.00% of Cr, 0.0005 to 0.0030% of B, 0.005 to 0.10% of acid-soluble Al, up to 0.010% of P, up to 0.0020% of N, 0.010 to 0.050% of Ti and the balance iron and inevitable impurities, and has a tempered martensitic structure obtained by quenching and tempering.

High-tension high-toughness steel having excellent resistance to delayed

Method for direct heat treating austenitic stainless steel wire rod wherein a hot rolled austenitic stainless steel wire rod is rendered to finish the final finishing stand of a hot rolling mill at a temperature zone in the range of solution heat treatment, then the temperature zone of said solution heat treatment is so maintained that the austenitic crystal grain size is to be less than 7.0, and subsequently said wire rod is quenched to a temperature where no chromium carbide is precipitated at a cooling rate where no chromium carbide is precipitated.

Method for direct heat treating austenitic stainless steel wire rod

Method for heat treating hot rolled steel wire rod in direct sequence with the final finishing stand of a rod hot rolling mill which comprises a series of steps of subjecting the rod emerging from the rolling mill to a direct controlled cooling in the range of Ms to 550.degree. C. by utilizing the retained heat of the rod, and subsequently reheating it to a temperature as equal as the nose temperature of TTT diagram with a view to achieving the complete transformation to the sorbite structure, whereby a wire rod product having the mechanical properties equal to those of a rod resulting from the lead patenting process can be obtained.

Method for direct heat treating hot rolled steel wire rod

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Hikari, Japan

Jiro Tominaga