PRODUCTION OF HARD STEEL MATERIAL

Japanese Patent JPS6184331

A

In the production of medium carbon steel wire rod, upon leaving the hot rolling mill, the rod is cooled in two phases. The first phase is operative as the rod moves at end-of-rolling speed along a cooling line disposed between the finishing block and feed rollers disposed at the entry of a head for placing the rod in overlapping turns on a conveyor, the cooling line being continuous-i.e. being devoid of air cooling breaks between consecutive intensive cooling sections, the length and capacity of the cooling line being such that the surface temperature of the rod at the end of the first phase is between, on the one hand, the start-of-martensitic-transformation temperature for the particular steel concerned and, on the other hand, the latter temperature plus 200 DEG C. The second cooling phase is operative upon the rod once it has been placed in overlapping non-concentric turns on the conveyor, the time which elapses between the end of the first phase and the start of the second phase being less than the time needed for the percentage of transformed austenite to exceed 5%. Austenite transformation is at least 95% at the departure from the second phase.

NORUBEERU BATSUSHI
MARIOSU EKONOMOPOUROSU
MARUKU GURETSUDO
GIYUI RETSUSERU
ARUTOUURU SHIYUMEE

JP16276085A

April 28, 1986

July 23, 1985

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CENTRE RECH METALLURGIQUE
ARBED

B21B45/02; B21C47/26; C21D9/52; C21D9/573; (IPC1-7): B21B45/02; C21D9/52

JP45023215A
JPS52150314A	1977-12-14
JPS55161031A	1980-12-15
JPS5845328A	1983-03-16

Kyozo Yuasa

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