Method for the preparation of high-strength fine wire of high-ca

Details Method for the preparation of high-strength fine wire of high-ca Method for the preparation of high-strength fine wire of high-ca

1992-11-04

1993-06-22

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148599, C21D 806

Patent

active

052213781

ABSTRACT:
An improved method is proposed for the manufacture of a very fine high-carbon steel wire having a diameter of 50 .mu.m or smaller. In the wire drawing process by repeating a plural number of cycles each consisting of a patenting treatment and a cold-drawing treatment starting from a base steel wire rod, the final drawing treatment is preceded by a heat treatment of the intermediate wire having a diameter of about 100-500 .mu.m in an atmosphere of a gaseous mixture of 90-98% by volume of nitrogen and 2-10% by volume of hydrogen at 750.degree.-900.degree. C. for 1-30 seconds so that the final drawing can be safely conducted without breaking of the fine wire.

REFERENCES:
patent: 4375378 (1983-03-01), Ohtani et al.
patent: 4620884 (1986-11-01), Heath

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