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A kind of plastic mold steel and its manufacturing method

A technology of plastic mold steel and chemical composition, applied in the field of large-scale pre-hardened plastic mold steel and its manufacturing, to achieve the effects of improving performance, increasing stability, and reasonable chemical composition ratio

Active Publication Date: 2011-12-21
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the die steel produced according to the above-mentioned patent can be used as a non-quenched and tempered bainite steel, it can only be used as a hot-rolled flat steel product with a thickness of less than 300mm

Method used

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  • A kind of plastic mold steel and its manufacturing method
  • A kind of plastic mold steel and its manufacturing method
  • A kind of plastic mold steel and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The chemical composition weight percentage of the plastic mold steel in this embodiment is: C 0.28wt%, Si0.49wt%, Mn 1.44wt%, Cr 1.40wt%, Mo 0.46wt%, Nb 0.035wt%, Ni 0.13wt%, Cu 0.11 wt%, S 0.003wt%, P 0.013wt%, N 0.0098wt%, and the balance is Fe and inevitable impurities.

[0052] According to the above chemical composition ratio, after the initial smelting in the electric arc furnace and the refining outside the furnace, the ingot is cast into a 25-ton steel ingot; then the steel ingot is heated to 1165 ℃ at a heating rate of 80 ℃ / hour to 120 ℃ / hour in the forging heating furnace, and the temperature is kept warm. For 5.5 hours, the steel ingot was forged, the forging temperature was 1110 °C, and the forging temperature was 930 °C; after forging, a forged module with a thickness of 660 mm was obtained; the above forged module was directly placed in the air and cooled to room temperature to obtain the thickness 660mm pre-hardened plastic mould steel.

[0053] The plas...

Embodiment 2

[0058] The chemical composition weight percentage of the plastic mold steel in this embodiment is: C 0.25wt%, Si 0.40wt%, Mn 1.50wt%, Cr 1.20wt%, Mo 0.50wt%, Nb 0.050wt%, Ni 0.11wt%, Cu 0.12 wt%, S 0.013wt%, P 0.020wt%, N 0.012wt%, and the balance is Fe and inevitable impurities.

[0059] According to the above chemical composition ratio, after the initial smelting in the electric arc furnace and the refining outside the furnace, the ingot is cast into a 35-ton steel ingot; then the steel ingot is heated to 1160 ℃ at a heating rate of 80 ℃ / hour to 120 ℃ / hour in the forging heating furnace, and the heat preservation is carried out. For 8.0 hours, the ingot was forged, the forging temperature was 1100°C, and the forging temperature was 850°C; after forging, a forged module with a thickness of 610 mm was obtained; the above-mentioned forged module was directly placed in the air and cooled to room temperature to obtain a thickness of 610 mm. 610mm pre-hardened plastic mould st...

Embodiment 3

[0062] The chemical composition weight percentages of the plastic mold steel in this embodiment are: C 0.25wt%, Si 0.60wt%, Mn 1.30wt%, Cr 1.40wt%, Mo 0.44wt%, Nb 0.020wt%, Ni 0.10wt%, Cu 0.11 wt%, S 0.012wt%, P 0.016wt%, N 0.009wt%, the balance is Fe and inevitable impurities;

[0063] According to the above chemical composition ratio, after the initial smelting in the electric arc furnace and the refining outside the furnace, the ingot is cast into a 25-ton steel ingot; then the steel ingot is heated to 1170 ℃ at a heating rate of 80 ℃ / hour to 120 ℃ / hour in the forging heating furnace, and the temperature is kept warm. For 6.0 hours, the ingot was forged, the forging temperature was 1120°C, and the stop forging temperature was 880°C; after the forging was completed, a forged module with a thickness of 620 mm was obtained; the above-mentioned forged module was directly placed in the air and cooled to room temperature to obtain a thickness of 620 mm. 620mm pre-hardened plastic...

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Abstract

The invention discloses a plastic mold steel which comprises the following chemical components in percentage by weight: 0.25-0.29% of C, 1.30-1.50% of Mn, 0.40-0.60% of Si, 1.20-1.50% of Cr, 0.40-0.50% of Mo, 0.02-0.05% of Nb, less than or equal to 0.15% of Ni, less than or equal to 0.15% of Cu, less than or equal to 0.020% of P, less than or equal to 0.015% of S, less than or equal to 0.012% of N and the balance of iron and inevitable impurities. In the manufacture method of the plastic mold steel, a quenching and tempering heat treatment process is not used, and direct air cooling after forging is carried out, thus prehardened plastic mold steel with thickness above 600 mm and uniform hardness from core to surface is manufactured. According to the plastic mold steel disclosed by the invention, the limit that the existing non-quenched and tempered mold steel has thickness smaller than 400 mm is overcome, and the requirements of mold industries on low-cost high-quality large-sized prehardened plastic mold steel are reached.

Description

technical field [0001] The invention belongs to the field of mold steel manufacturing technology in the metallurgical industry, and particularly relates to a large-size prehardened plastic mold steel and a manufacturing method thereof. Background technique [0002] Plastic mold is an important process equipment in the plastic forming and processing industry, accounting for the first place in the total output value of the mold industry. Due to its large amount of materials, varieties and specifications, it has formed a special plastic mold steel. At present, plastic molds are developing in the direction of high precision, multi-cavity, and large-scale. The mold cavity is complex and the processing accuracy is high. Therefore, high-quality plastic molds are made of pre-hardened plastic mold steel. The pre-hardened plastic mold steel is supplied by the metallurgical plant to ensure that the mold steel meets the hardness and performance required by the user. After the user obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48
Inventor 续维吴晓春周荃闵永安罗毅
Owner 宝武特种冶金有限公司
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