Ferritic steel having ultra-fine grains and a method for produci

Details Ferritic steel having ultra-fine grains and a method for produci Ferritic steel having ultra-fine grains and a method for produci

1983-04-01

1984-08-21

Stallard, W.

Metal treatment

Compositions

Heat treating

148 36, C21D 714

Patent

active

044668422

ABSTRACT:
A novel hot-rolled ferritic steel composed of 70% or more of equiaxed ferrite grains having an ultra-fine grain size of 4 .mu.m or less. This steel is produced by a hot working at approximately the Ar.sub.3 point and by one or more passes of the hot working having a total reduction ratio of at least 75%. When a plurality of passes is carried out, the time between passes is less than one second. Due to hot working, dynamic transformation of austenite and/or dynamic recrystallization of ferrite takes place. The total reduction ratio may be at least 35% for a high purity steel.

REFERENCES:
patent: 3826691 (1974-07-01), Melloy et al.
patent: 3897279 (1975-07-01), Shaughnessy et al.
patent: 3994754 (1976-11-01), Geymond
patent: 4001052 (1977-01-01), Nakazato
patent: 4088511 (1978-05-01), Rowney
patent: 4325751 (1982-04-01), Josefsson
patent: 4388122 (1983-06-01), Sudo et al.
patent: 4400223 (1983-08-01), Heitmann et al.

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