High-hardness high-polishing pre-hardening plastic die steel and manufacture technology thereof

A technology of plastic mold and preparation process, applied in the field of alloy steel, can solve the problems of high steel price, increase the manufacturing cost of automobile products, etc., and achieve the effect of low alloy cost, improving manufacturing level and market competitiveness, and high hardness uniformity.

Active Publication Date: 2015-04-22
RUGAO HONGMAO HEAVY FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the price of H11 steel is higher, which will greatly i

Method used

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  • High-hardness high-polishing pre-hardening plastic die steel and manufacture technology thereof
  • High-hardness high-polishing pre-hardening plastic die steel and manufacture technology thereof
  • High-hardness high-polishing pre-hardening plastic die steel and manufacture technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, the components and mass percentages of the high-hardness and high-polishing pre-hardened plastic mold steel are as follows:

[0043] C 0.40%, Si 0.30%, Mn 2.00%, Cr 2.50%,

[0044] Mo 1.00%, V 0.30%, P 0.025%, S 0.005%,

[0045] Ni 1.5%, Nb 0.15%, Fe balance.

[0046] Adopt the material in this embodiment to produce the technological process and the steps of high hardness and high polishing pre-hardened plastic mold steel as follows:

[0047] 1. Smelting: batching is carried out according to the ratio of alloying elements in the examples, and the batching is sent to the electric arc furnace for smelting and refining, and then the gas dissolved in the liquid metal is removed by vacuum degassing to prevent defects, and finally cast into steel ingots, and then Hot forging heating furnace; the use of hot delivery is to achieve the purpose of energy saving and emission reduction.

[0048] 2. High-temperature diffusion heat treatment: the steel ingot is...

Embodiment 2

[0062] In this embodiment, the components and mass percentages of the high-hardness and high-polishing pre-hardened plastic mold steel are as follows:

[0063] C 0.26%, Si 0.20%, Mn 1.7%, Cr 1.8%,

[0064] Mo 0.60%, V 0.20%, P 0.015%, S 0.002%,

[0065] Ni 1.00%, Nb 0.06%, Fe balance.

[0066] The process and steps of producing high-hardness and high-polish pre-hardened plastic mold steel using the materials in the above-mentioned embodiments are the same as those in Embodiment 1, and will not be repeated here.

[0067] The high-hardness and high-polishing pre-hardened plastic mold steel in this embodiment undergoes the above-mentioned smelting, thermal processing and heat treatment, and the final product specification is (length*width*thickness) 2500mm*1300mm*500mm module. The performance test is carried out by sampling, and the test results are as follows:

[0068] A phase change characteristics:

[0069] The CCT curve of the high hardness and high polishing pr...

Embodiment 3

[0075] In this embodiment, the components and mass percentages of the high-hardness and high-polishing pre-hardened plastic mold steel are as follows:

[0076] C 0.25%, Si 0.10%, Mn 1.50%, Cr 1.50%,

[0077] Mo 0.50%, V 0.10%, P 0.005%, S 0.001%,

[0078] Ni 0.60%, Nb 0.001%, Fe balance.

[0079] The process and steps of using the materials in this example to produce high-hardness and high-polish pre-hardened plastic mold steel are as described in Example 1, and will not be repeated here.

[0080] After the high-hardness and high-polishing pre-hardened plastic mold steel of the present invention undergoes the above-mentioned smelting, thermal processing and heat treatment, the final product specification is (length*width*thickness) 2500mm*1300mm*500mm module, sampling for performance testing, and the test results are:

[0081] A phase change characteristics:

[0082] The CCT curve of the high hardness and high polishing pre-hardening plastic mold steel of the ...

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Abstract

The invention relates to a high-hardness high-polishing pre-hardening plastic die steel and a manufacture technology thereof, which belongs to the technical field of alloy steel manufacture technology. The steel is characterized in that the alloy chemical component comprises the following alloy elements by mass percentages: 0.25-0.40% of C, 0.10-0.30% of Si, 1.50-2.00% of Mn, 1.50-2.50% of Cr, 0.50-1.00% of Mo, 0.10-0.30% of V, less than or equal to 0.025% of P, less than or equal to 0.005% of S, 0.60-1.50% of Ni, less than or equal to 0.15% of Nb, and the balance of Fe. The manufacture method comprises the following steps: burdening, smelting, pouring, performing hot delivery; performing high-temperature diffusing heat treatment, then performing multi-directional forging and hot processing, normalizing on fine grains and dehydrogenizing and annealing; and finally quenching and performing temper heat treatment to obtain the tempered structure with hardness of 38-42HRC. The steel of the invention has the advantages of low cost, high hardenability, high hardness, high polishing performance and dermatoglyph etching performance.

Description

technical field [0001] The invention relates to a plastic mold steel, in particular to a high-hardness and high-polishing pre-hardened plastic mold steel, and also relates to a preparation process for the plastic mold steel, which belongs to the technical field of alloy steel. Background technique [0002] With the rapid development of my country's manufacturing industry, more and more molds are used, and the performance requirements for mold materials are also getting higher and higher. In the automobile manufacturing industry, molds are used in the production of automobile lights, rearview mirrors, instrument panels, interior parts, etc. These molds require high polishing performance and processing performance, and most of them are made of H11 steel materials at present. But the high price of H11 steel will greatly increase the manufacturing cost of these automotive products. Especially in the global economic downturn since 2012, saving resources and reducing costs is a ...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/48C22C38/46C21D8/00
CPCC21D8/005C22C38/02C22C38/04C22C38/08C22C38/12C22C38/18
Inventor 周青春徐卫明吴晓春顾金才钱强王小飞丁勇刘鑫杨怡祖
Owner RUGAO HONGMAO HEAVY FORGING
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