Method of hot-forming metals prone to crack during rolling

Details Method of hot-forming metals prone to crack during rolling Method of hot-forming metals prone to crack during rolling

1979-10-01

1982-10-05

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 115C, 164 76, C22F 108

Patent

active

043526977

ABSTRACT:
A method of continuously casting a molten metal in a casting means to obtain a solidified cast bar at a hot-forming temperature, passing the cast metal at a hot-forming temperature from the casting means to a hot-forming means, and hot forming the cast bar into a wrought product by a two-stage reduction of its cross-sectional area while it is still at a hot-forming temperature, including, in the first stage, the step of forming a shell of finely distributed recrystallized grains in the surface layers of the cast bar by a selected small amount of deformation of the cast bar in its as-cast condition prior to the second stage in which substantial reduction of its cross-sectional area forms the wrought product. The shell of fine grains formed on the cast bar during the first stage of deformation permits substantial reduction of the cross-sectional area of the cast bar during the second stage of deformation without the cast bar cracking, even when the cast bar has a high impurity content.

REFERENCES:
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patent: 3317994 (1967-05-01), Cofer et al.
patent: 3333452 (1967-08-01), Sendzimir
patent: 3589430 (1971-06-01), Barrow et al.
patent: 3710436 (1973-01-01), Schoffmann
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patent: 3942582 (1976-03-01), Dompas et al.
patent: 3987536 (1976-10-01), Figueres et al.
patent: 4151896 (1979-05-01), Nicoud et al.
Dowsing, "New 31/4 M Production Line Upgrades Quality, Doubles Output for Delta Metal", Metals and Materials, Jun. 1975, pp. 19-23.
Application Data Sheet-"Standard Designations for Copper and Copper Alloys" CDA Inc., N.Y., N.Y., pp. 1, 3 and 18.

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