C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/34.6
C21D 8/06 (2006.01)
Patent
CA 1222678
Abstract of the Disclosure Herein disclosed is a process for producing a steel bar or steel wire, comprising the steps of heating a steel containing less than 2 % of C at a temperature higher than the Ac1 point of the steel, rough working the heated steel, finish working the rough-worked steel within a temperature range between Ar1 and Ar3 or Arcm with a reduction ratio of at least 20 % and subjecting the finish-worked steel to an annealing treatment, whereby providing a steel bar or steel wire having an improved spheroidal structure of cementite. The cooling rate of the rough-rolled steel to the starting temperature of 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 rough-worked steel at a cooling rate higher than 250°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 rough-worked steel at a cooling rate higher than 10°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 rough-worked steel at a cooling rate higher than 2°C/sec. The annealing may be conducted by an isothermal treatment, slow cooling treatment, repeating treatment or a usual annealing method.
459371
Aihara Kenji
Kanbara Susumu
Ogilvy Renault
Sumitomo Metal Industries Ltd.
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