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Steel for mold

A mold steel, high-quality technology, applied in the field of mold steel, can solve the problems of poor corrosion resistance, poor mirror polishing or embossing processability, etc., and achieve the effects of low manufacturing cost, easy mold processing, and high thermal conductivity

Pending Publication Date: 2022-05-27
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Steel with Cr content below 6% has poor corrosion resistance in wet environment
In addition, steels with significant segregation, steels capable of presenting many hard non-metallic inclusions such as alumina, or steels containing large amounts of free-machining elements have poor mirror finish or embossing properties

Method used

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  • Steel for mold
  • Steel for mold
  • Steel for mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 18 and comparative example 1 to 8

[0271] [1. Preparation of samples]

[0272]The chemical compositions of the 26 steels used for evaluation are shown in Table 1. Although not shown in the table, other elements each present in an amount less than the specified amount may sometimes be included as impurities.

[0273] Here, the material of Comparative Example 1 is steel commercially available as P21 steel. The material of Comparative Example 2 is steel commercially available as P20 steel. The material of Comparative Example 3 is steel prepared by increasing the amount of P in Comparative Example 2. The material of Comparative Example 4 was SKD61.

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Abstract

The present invention relates to a steel for a die, comprising: 0.070 mass% < = C < = 0.130 mass%, 0.01 mass% < = Si < = 0.60 mass%, 0.02 mass% < = Mn < = 0.60 mass%, 0.003 mass% < = P < = 0.150 mass%, 0.005 mass% < = Cu < = 1.50 mass%, 0.005 mass% < = Nilt; 0.80 mass%, 7.50 mass% < = Cr < = 8.40 mass%, 0.70 mass% lt; mo < = 1.20 mass%, 0.01 mass% < = V < = 0.30 mass%, 0.010 mass% < = Al < = 0.120 mass%, 0.015 mass% < = N < = 0.095 mass%, and the balance being Fe and unavoidable impurities. The die steel provided by the invention meets all six characteristics: SA characteristic, tempering hardness, residual stress, machinability, impact value and corrosion resistance.

Description

technical field [0001] The present invention relates to steel for molds. More specifically, the present invention relates to mold steel (particularly, by making a mold used in the injection molding or blow molding of plastics, or in the molding or processing of rubber or various carbon fiber reinforced plastics, etc.) A pre-hardened steel that is quenched-tempered and thermally refined to a predetermined hardness under conditions). Background technique [0002] Pre-hardened steel refers to steel that is thermally refined to a predetermined hardness and capable of being cut and machined. Pre-hardened steel does not require heat treatment and can be used directly as a mold or mold part after machining. Therefore, pre-hardened steel is often used in moulds used in injection moulding or blow moulding of plastics, or in the forming or machining of rubber or fibre reinforced plastics (eg FRP, CFRP, CFRTP, GFRP) etc. for assembly to be assembled to mold parts, etc. To date, var...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54C22C38/60
CPCC22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/06C22C38/001C22C38/52C22C38/54C22C38/48C22C38/50C22C38/60C22C38/002C21D6/004C21D8/0242
Inventor 河野正道
Owner DAIDO STEEL CO LTD