Title:
PREHARDEN STEEL FOR PLASTIC MOLDING AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JPH07278737
Kind Code:
A
Abstract:
PURPOSE: To attain the prolongation of a tool service life of a die or the like while the performance of a preharden steel is maintained.
CONSTITUTION: This preharden steel for plastic molding is the one having a fundamental compsn. contg., by weight, 0.05 to 0.17% C, ≤0.60% Si, 0.5 to 2.0% Mn, 2.5 to 3.5% Ni, 0.5 to 1.5% Al, 0.7 to 2.5% Cu, and the balance Fe with inevitable impurities and having a structure of lower bainitic one. As for a method for producing thereof, the same steel is subjected to lower bainite forming heat treatment in which it is heated to an austenitic region and is thereafter cooled to a lower bainitic region.
Inventors:
YASO YOSHIO
MURAKAWA YOSHIYUKI
KAWAKAMI AKIRA
MURAKAWA YOSHIYUKI
KAWAKAMI AKIRA
Application Number:
JP9054294A
Publication Date:
October 24, 1995
Filing Date:
April 05, 1994
Export Citation:
Assignee:
HITACHI METALS LTD
International Classes:
C22C38/00; C21D6/00; C22C38/16; (IPC1-7): C22C38/00; C22C38/16
Attorney, Agent or Firm:
Oba Mitsuru