Process for production of steel bar or steel wire having an impr

Details Process for production of steel bar or steel wire having an impr Process for production of steel bar or steel wire having an impr

1984-07-19

1986-08-05

Stallard, Wayland

Metal treatment

Compositions

Heat treating

C21D 952

Patent

active

046041451

ABSTRACT:
Herein disclosed is a process for producing a steel bar or steel wire having an improved structure of spheroidal cementite. The process is characterized in that a finish rolling is conducted within a temperature range between Ar.sub.1 and Ar.sub.3 or Arcm with a reduction ratio of at least 20%.
The cooling rate of the steel before the finish rolling should be controlled in the following manner:
When the hardenability of the steel is not higher than that of 0.15% C plain carbon steel, it is preferable to cool the steel at a cooling rate higher than 250.degree. C./sec.
When the hardenability of the steel is between those of 0.15% to 0.4% C plain carbon steel, it is preferable to cool the steel at a cooling rate higher than 10.degree. C./sec.
When the hardenability of the steel is not lower than that of 0.4% C plain carbon steel, it is preferable to cool the steel at a cooling rate higher than 2.degree. C./sec.
The annealing may be conducted on the same production line as the hot working of the steel for a shorter time duration by an isothermal treatment, slow cooling treatment or repeating treatment. The annealing may be conducted also by a usual annealing method.

REFERENCES:
patent: 3926687 (1975-12-01), Gondo et al.
patent: 4016009 (1977-04-01), Economopolous et al.
patent: 4448613 (1984-05-01), Sherby et al.

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