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A kind of high toughness plastic mold steel and its production method

A technology of plastic mold steel and production method, which is applied to high-toughness plastic mold steel and its production field, can solve the problems of large fluctuation of hardness, many processes, and limitation of practical use performance, and achieves good hardness uniformity and fine grain size. the effect of

Active Publication Date: 2016-08-17
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common thickness specification of the steel plate used to make plastic molds is 25-120mm. The plastic molds produced by quenching and tempering heat treatment processes have large fluctuations in hardness in the thickness direction, and the actual performance is limited to a certain extent.
[0003] At present, the raw materials of steel plates for plastic molds are mostly produced by the ingot blanking process, which requires many processes and requires multiple heating, which requires high production equipment.

Method used

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  • A kind of high toughness plastic mold steel and its production method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0037] The chemical composition of the high-toughness plastic mold steel according to Example 1 is C0.37, Si0.28, Mn0.90, Cr1.83, Mo0.35, S≤0.015, P≤0.015, Als: 0.023, and the rest For Fe and unavoidable impurities.

[0038] The production method of the high-toughness plastic mold steel according to Example 1 includes slab heating, controlled rolling, slow cooling of the steel plate, normalizing, and tempering. The size of continuous casting slab is: 250~300mm×2200mm×3100mm.

[0039] In Example 1, the slab was heated to 1200° C. at a heating rate of 6.5 min / cm. After descaling by high-pressure water, it is rolled on a double-stand four-high reversible wide and thick plate rolling mill, and the steel plate is turned into steel before the rough rolling mill. The ratio of the thickness of the intermediate billet to the thickness of the finished product is 2.5 times, and the starting temperature of the finish rolling is 890°C. After rolling, the steel plate is slowly cooled, an...

Embodiment 2

[0042] The chemical composition of the high-toughness plastic mold steel according to Example 2 is C0.37, Si0.28, Mn0.90, Cr1.80, Mo0.37, S≤0.015, P≤0.015, Als: 0.030, and the rest For Fe and unavoidable impurities.

[0043] The production method of the high-toughness plastic mold steel according to Example 2 includes slab heating, controlled rolling, slow cooling of the steel plate, normalizing, and tempering. The size of continuous casting slab is: 250~300mm×2200mm×3100mm.

[0044]In Example 2, the slab was heated to 1220° C. at a heating rate of 6.5 min / cm. After descaling by high-pressure water, it is rolled on a double-stand four-high reversible wide and thick plate rolling mill, and the steel plate is turned into steel before the rough rolling mill. The ratio of the thickness of the intermediate billet to the thickness of the finished product is 2 times, and the starting temperature of the finish rolling is 850°C. After rolling, the steel plate is slowly cooled, and t...

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Abstract

The invention provides a high-toughness plastic die steel and a production method thereof. The die steel comprises the following chemical components in percentage by mass: 0.30-0.42% of C, 0.20-0.50% of Si, 0.75-1.00% of Mn, 1.50-2.00% of Cr, 0.25-0.50% of Mo, at most 0.015% of S, at most0.025% of P, 0.010-0.040% of Als and the balance of Fe and inevitable impurities. According to the production method of the high-toughness plastic die steel, a normalizing-tempering technique is utilized to product the die steel to implement grain refinement, so that the product hardness is up to 28-32 HRC, the uniformity of hardness is favorable, the Charpy V-notch ballistic work is up to higher than 80J, and the product specification can cover 20-120mm.

Description

technical field [0001] The invention relates to a mold steel and a production method thereof, more specifically, the invention relates to a high-toughness plastic mold steel and a production method thereof. Background technique [0002] With the lightening of automobiles and the enlargement of electrical products, the requirements for the performance of die steel are getting higher and higher. Die steel is required to have excellent machinability, small heat treatment deformation, and good dimensional stability. In order to meet the above requirements, the use of pre-hardened die steel has attracted more and more attention. This steel has high purity, stable performance, uniform hardness distribution, good processability and surface finish. The common thickness specification of the steel plate used to make plastic molds is 25-120mm. The plastic molds produced by quenching and tempering heat treatment processes have large fluctuations in hardness in the thickness direction, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C21D8/02
Inventor 张兴锦陈永南吴会亮殷延涛陈学涛马光亭周平陈永生张兆萍
Owner LAIWU IRON & STEEL GRP
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