Method of producing fine-grain sheet or fine-grain plate of aust

Details Method of producing fine-grain sheet or fine-grain plate of aust Method of producing fine-grain sheet or fine-grain plate of aust

1977-02-01

1978-04-25

Stallard, W.

Metal treatment

Compositions

Heat treating

148 12E, C21D 713

Patent

active

040861058

ABSTRACT:
In a method of producing fine-grain sheet or plate, in particular fine-grain plate with a thickness of more than 50 mm, of austenitic steels by hot rolling billets or slabs in a number of passes, the mean velocity of the reduction in thickness (v in mm/min) achieved in a plurality of subsequent passes in dependence upon the ferrite content (f in %) of the steels is chosen in a manner that up to a ferrite content of 3.5%, the mean velocity of the reduction in thickness is more than 150 mm/min, and at a ferrite content of more than 3.5%, it is above a value given by the relationship v = 3.8 f.sup.2 - 60 f + 315, the deformation carried out in this manner amounting to at least 30%.

REFERENCES:
patent: 3849209 (1974-11-01), Ishizaki et al.
patent: 3865636 (1975-02-01), Suzuki et al.
patent: 4008103 (1977-02-01), Miyoshi et al.

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