Title:
MANUFACTURE OF HOT EXTRUDED MATERIAL USING CAST BILLET AS BLANK
Document Type and Number:
Japanese Patent JPS60149717
Kind Code:
A
Abstract:
PURPOSE: To prevent surface cracking by heating and hot extruding a cast billet subjected to cold or warm surface working.
CONSTITUTION: A continuously cast material or an ingot is used as a blank. The surface of the blank is subjected to shot peening, spinning or rolling in a cold or warm state at the recrystallization temp. or below. The blank is then heated to form a recrystallized surface layer of 0.2W2.5mm thickness, and it is hot extruded. By this method, surface cracking such as horizontal cracking or streak flawing in the longitudinal direction is prevented.
Inventors:
KOORI MITSURU
UCHIDA HIROYUKI
TAKASHIMA TAKAHIRO
UCHIDA HIROYUKI
TAKASHIMA TAKAHIRO
Application Number:
JP690384A
Publication Date:
August 07, 1985
Filing Date:
January 17, 1984
Export Citation:
Assignee:
KOBE STEEL LTD
International Classes:
B21C23/00; C21D7/02; C21D8/00; (IPC1-7): B21C23/00; C21D7/04
Attorney, Agent or Firm:
Aoyama
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