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Cold work die steel, die, and method for production of cold work die steel

A manufacturing method, a technology of die steel, applied in the manufacture of cold-worked die steel, in the field of manufacturing such die steel, can solve the problems of short die life, etc., and achieve the effects of prolonging life, excellent dimensional change suppression, and good welding repairability

Inactive Publication Date: 2009-09-09
KOBE STEEL LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the life of the die formed of pre-hardened steel is short, and at present, the die is still not put into practical use

Method used

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  • Cold work die steel, die, and method for production of cold work die steel
  • Cold work die steel, die, and method for production of cold work die steel
  • Cold work die steel, die, and method for production of cold work die steel

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Embodiment

[0230] The present invention will be described more specifically with reference to the following examples, but of course, the present invention is not limited to the examples. The present invention can be properly modified and changed within the range in which the present invention can achieve the above-mentioned and following objects, and any such modifications and changes should be within the technical scope of the present invention.

[0231] Embodiments of the first aspect of the invention are described below.

[0232] Various steel samples (numbers) shown in Table 1 and Table 2 were used. In a vacuum induction melting furnace, a 150 kg ingot was prepared into molten form, which was then heated at about 900 to 1150° C., and forged into two plates of 400 mmT x 750 mmW x about 2000 mmL. Next, the plates were gradually cooled at an average cooling rate of about 60°C / hr. After cooling to a temperature not higher than 100°C, the plates were heated again to a temperature of abo...

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Abstract

Disclosed is a cold work die steel which comprises (by mass): C: 0.20-0.60%, Si: 0.5-2.00%, Mn: 0.1-2%, Cr: 3.00-9.00%, Al: 0.3-2.0%, Cu: 1.00-5%, Ni: 1.00-5%, Mo: 0.5-3% and / or W: 2% or less (including 0%), and S: 0.10% or less (excluding 0%) wherein these components satisfy the following requirements (1) to (3) [wherein each square bracket [ ] means a content (%) of each element]: (1) [Cr] x [C]=3.00; (2) [Cu] / [Ni]: 0.5-2.2; and (3) [Mo]+0.5 x [W]: 0.5-3.0%, with the remainder being iron and unavoidable impurities. Also disclosed is a die produced by using the steel. Further disclosed is a method for producing the cold work die steel.

Description

technical field [0001] The present invention relates to a cold-worked die steel and a die, and to a method for manufacturing the cold-worked die steel. Specifically, the present invention relates to a die steel usable as a material for dies used in cold / hot press forging (stamping, bending, drawing, trimming, etc.) of steel sheets for automobiles and steel sheets for home appliances, and to a Methods used to manufacture such tool steels. Background technique [0002] Dies for forming steel sheets for automobiles and steel sheets for home appliances are required to have an extended life, as well as increased strength of the steel sheets. In particular, for steel sheets for automobiles, a highly tensile steel sheet having a tensile strength of at least about 590 MPa is increasingly required in consideration of environmental issues in order to improve automobile mileage; The early stages are compromised, leading to "seizure" (soldering phenomenon in press forging), which grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60C21D6/00
Inventor 村上昌吾殿村刚志
Owner KOBE STEEL LTD