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A kind of precipitation hardening plastic mold steel and its processing technology

A technology of plastic mold steel and processing technology, which is applied in the field of mold materials, can solve problems such as poor corrosion resistance, and achieve the effects of improving corrosion resistance, improving corrosion resistance, and refining grains

Active Publication Date: 2015-09-30
HUBEI SHANGDA MODEL MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of poor corrosion resistance in the prior art, to provide a precipitation hardened plastic mold steel and its processing technology that can significantly improve the corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A precipitation hardening plastic mold steel, the composition and mass % of the mold steel are: C 0.005, Si 2.9, Mn 0.35, P 0.017, S 0.008, Cr 32.5, Ni 11.05, Al 1.7, N 0.48, Ta 0.06, The rest is Fe.

[0044] The processing technology of above-mentioned precipitation hardening plastic mold steel comprises the following steps in turn:

[0045] a. The die steel is used as the consumable electrode for electroslag remelting, and the electroslag ingot is obtained by melting and casting;

[0046] b. Heating the above electroslag ingot to 1130°C at a rate of 100°C / h, and forging it into a module after holding it for 6 hours, wherein the forging start temperature is 1085°C, and the forging stop temperature is 910°C;

[0047] c. Air-cool the obtained module to room temperature to obtain ferritic stainless steel.

[0048] For detecting the effect of the present invention, with commonly used precipitation hardening plastic mold steel (brand is: 10Ni3MnCuAl) as contrast steel, th...

Embodiment 2

[0055] The steps are the same as in Example 1, except that the chemical composition and mass percentage of the mold steel are: C 0.008, Si 2.7, Mn 0.80, P 0.016, S 0.007, Cr 31.0, Ni 10.88, Al 1.6, N 0.42 , Ta 0.08; in step b, the electroslag ingot is heated to 1120°C at a rate of 80°C / h, and then forged into a module after holding for 8 hours, wherein the forging start temperature is 1050°C, and the forging stop temperature is 900°C.

[0056] The test results show that the heat treatment hardness value of the sample of this embodiment is 51, the wear rate is 24mg / 100min, and the average corrosion rate is 2.8g / m 2 h, when polished to 10,000 mesh, the polished surface has no defects.

Embodiment 3

[0058] The steps are the same as in Example 1, except that the chemical composition and mass percentage of the mold steel are: C 0.010, Si 2.6, Mn 0.53, P 0.015, S 0.009, Cr 31.6, Ni 12.10, Al 1.85, N 0.45 , Ta 0.05; in step b, the electroslag ingot is heated to 1150°C at a rate of 90°C / h, and then forged into a module after holding for 5 hours, wherein the forging start temperature is 1100°C, and the forging stop temperature is 920°C.

[0059] The test results show that the heat treatment hardness value of the steel in this example is 52.5, the wear rate is 23.5mg / 100min, and the average corrosion rate is 2.6g / m 2 h, when polished to 10,000 mesh, the polished surface has no defects.

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PUM

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Abstract

Novel precipitation hardening plastic die steel comprises the following components by mass percentage: 0.005-0.01% of C, 2.6-2.9% of Si, 0.3-0.8% of Mn, less than 0.02% of P, less than 0.01% of S, 31-33% of Cr, 10.4-13.6% of Ni, 1.6-2.0% of Al, 0.4-0.5% of N, 0.05-0.1% of Ta, and the balance of Fe. During processing, the die steel serves as a consumable electrode for electroslag remelting, fusion casting is performed to obtain an electroslag ingot, the electroslag ingot is heated to 1120-1150 DEG C, after the temperature is held for 5-8h, a die block is forged, and finally the die block is subjected to air cooling to the room temperature. The corrosion resistance, the rigidity, the abrasive resistance and the polishability of the die steel are improved, the purity of the steel is ensured, and the production cost is lowered.

Description

technical field [0001] The invention relates to a mold material, in particular to a precipitation-hardened plastic mold steel and its processing technology, which is specifically suitable for improving the corrosion resistance, hardness, wear resistance and polishing performance of the mold steel. Background technique [0002] As an important process equipment in the plastic molding processing industry, plastic molds are used more and more widely. Because of their large steel consumption and many varieties and specifications, they account for a large proportion of mold steel. Steel for plastic molds is generally required to have certain strength, hardness, mold resistance and corrosion resistance, etc., and also requires good cutting performance, polishing performance, and skin texture processing performance. [0003] At present, the most common application of precipitation hardening plastic mold steel is low carbon precipitation hardening mold steel (composition mass%: C 0....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C22B9/18
Inventor 李民华
Owner HUBEI SHANGDA MODEL MATERIAL TECH