Oversized-section bainite pre-hardening plastic die steel and manufacturing method

A plastic mold and bainite technology, applied in the field of alloy steel, can solve the problems of long manufacturing cycle and high manufacturing cost, and achieve the effect of reducing alloy cost, shortening manufacturing cycle and reducing manufacturing cost

Active Publication Date: 2014-09-17
RUGAO HONGMAO HEAVY FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the manufacturing cost of 718 or 1.2738 mold steel is high, and the manufacturing cycle is long, which brings huge pressure to mold users

Method used

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  • Oversized-section bainite pre-hardening plastic die steel and manufacturing method
  • Oversized-section bainite pre-hardening plastic die steel and manufacturing method
  • Oversized-section bainite pre-hardening plastic die steel and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The composition and weight percentage of the hot work die steel are as follows:

[0047] C is 0.28%, Si is 0.20%, Mn is 2.30%, Cr is 1.30%, Mo is 0.20%,

[0048] V is 0.20%, P is 0.020%, S is 0.015%, Ni is 0.20%, Nb is 0.08%, and Fe is the balance.

[0049] The process and steps of super-large cross-section bainitic pre-hardened plastic mold steel are as follows:

[0050] 1) Electric furnace smelting: smelting in an electric arc furnace according to the above alloy element ratio, then refining outside the furnace and vacuum degassing, casting into ingots and sending them to the forging heating furnace;

[0051] 2) High-temperature diffusion heat treatment: the heating temperature is 1200-1250°C, and the holding time is 15-20h;

[0052]3) Forging hot processing: the steel ingot that has undergone high-temperature diffusion heat treatment is cooled to a temperature range of 1150-1200 ° C for multi-directional forging processing, using two upsetting and two drawing forgi...

Embodiment 2

[0065] The composition and weight percentage of the hot work die steel are as follows:

[0066] C is 0.15%, Si is 0.10%, Mn is 3.00%, Cr is 1.00%, Mo is 0.30%,

[0067] V is 0.10%, P is 0.015%, S is 0.025%, Ni is 0.10%, Nb is 0.14%, and Fe is the balance.

[0068] The preparation method of the ultra-large cross-section bainite pre-hardened plastic mold steel in this embodiment is the same as that in Embodiment 1, wherein the tempering is heated to 450-500°C.

[0069] After the above-mentioned smelting, thermal processing and heat treatment of the ultra-large cross-section bainitic pre-hardened die steel in this example, the final product specification is (length×width×thickness) 2500mm×1300mm×1200mm module, and samples are taken for performance testing:

[0070] A phase change characteristics:

[0071] The CCT curve of present embodiment steel is as attached Figure 5 shown.

[0072] B Microstructure:

[0073] The microstructure of the steel in this embodiment is as attac...

Embodiment 3

[0079] The composition and weight percentage of the hot work die steel are as follows:

[0080] C is 0.30%, Si is 0.30%, Mn is 2.00%, Cr is 2.00%, Mo is 0.10%,

[0081] V is 0.30%, P is 0.03%, S is 0.03%, Ni is 0.30%, Nb is 0.10%, and Fe is the balance.

[0082] The preparation method of the ultra-large cross-section bainite pre-hardened plastic mold steel in this embodiment is the same as that in Embodiment 1.

[0083] After the above-mentioned smelting, thermal processing and heat treatment of the ultra-large cross-section bainitic pre-hardened die steel in this example, the final product specification is (length×width×thickness) 2500mm×1300mm×1200mm module, and samples are taken for performance testing:

[0084] A phase change characteristics:

[0085] The CCT curve of present embodiment steel is as attached Figure 9 shown.

[0086] B Microstructure:

[0087] The microstructure of the steel in this embodiment is as attached Figure 10 shown.

[0088] C hardness unif...

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Abstract

The invention relates to a low-cost oversized-section bainite pre-hardening plastic die steel and its manufacturing method and belongs to the technical field of an alloy steel manufacturing technology. The steel is characterized in that main alloy elements in alloy chemical components comprise, by weight, 0.15-0.30% of C, 0.10-0.30% of Si, 2.00-3.00% of Mn, 1.00-2.00% of Cr, 0.10-0.30% of Mo, 0.10-0.30% of V, P being less than 0.03%, S being less than 0.03%, 0.10-0.30% of Ni, Nb being less than or equal to 0.15%, and the balance Fe. The manufacturing process of the steel comprises steps as follows: burdening, smelting, casting and hot charging; heat treatment by high-temperature heat diffusion, hot working by multi-directional forging, and controlled cooling after forging; and heat treatment by tempering. The steel provided by the invention has advantages of short period, low cost, high hardenability, high uniformity of hardness and dermatoglyph etching performance.

Description

technical field [0001] The invention relates to a plastic mold steel, in particular to a low-cost super-large cross-section bainite pre-hardened plastic mold steel, and also relates to a manufacturing process for preparing the plastic mold steel, which belongs to the technical field of alloy steel. Background technique [0002] The large plastic molds currently used are mainly American standard 718 mold steel and European standard 1.2738 mold steel. These mold steels are mainly used to manufacture automobile bumper molds and some large home appliance molds. The size of the automobile bumper mold reaches 2300mm×1800mm× 800mm. This requires the mold material to have high hardenability and uniformity of hardness. Therefore, this type of die steel mainly relies on imported 718 or 1.2738 die steel. This will greatly increase the use cost of the mold user and the manufacturing cost of related products. [0003] With the rapid development of my country's mold manufacturing indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D8/00
Inventor 周青春徐卫明吴晓春顾金才钱强王小飞丁勇刘鑫
Owner RUGAO HONGMAO HEAVY FORGING
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