Super-thick non-hardening plastic mold steel and method for manufacturing the same

A plastic mold steel and manufacturing method technology, applied in the direction of manufacturing tools, heat treatment process control, heat treatment equipment, etc., can solve the problems of high quenching crack sensitivity, small thickness of rolling forming, high manufacturing cost, etc., achieve high hardenability, Effect of improving hardenability and reducing production cost

Active Publication Date: 2008-01-02
宝武特种冶金有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to develop a kind of ultra-thick non-quenched and tempered plastic mold steel and its manufacturing method, to overcome the high manufacturing cost of pre-hardened plastic mold steel, long manufacturing cycle, high quenching crack sensitivity and the existing non-quenched and tempered plastic mold steel The shortcoming of the small thickness of rolling forming ensures that the large-section die steel can obtain the bainite structure and the hardness HRC30-36 required by the pre-hardened plastic die steel, and adopts forging for hot forming to control the cooling rate after forging , realized the non-quenching and tempering of ultra-thick plastic mold steel with a thickness of more than 300mm

Method used

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  • Super-thick non-hardening plastic mold steel and method for manufacturing the same

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Embodiment 1

[0048] Example 1, first heat the steel ingot to 1170°C for 3 hours and then press the pliers, then return to the furnace and heat it to 1170°C for 170 minutes and then upsetting. After upsetting, one steel ingot is returned to the furnace for heating, and the other continues to be drawn. To the finished product specification of 300mm×790mm×5000mm; a steel ingot returned to the furnace is held at 1170°C for 120 minutes, then upsetting and elongated to the finished product specification of 450mm×790mm×3500mm; after the module is forged, it is air-cooled to room temperature and carried out at 600°C Tempering treatment.

[0049] The final hardness of the module is: HRC32~34, the hardness is uniform, the surface layer and the core of the module with a thickness of up to 450mm are all bainite structures, and the structure is very uniform, see pictures of the structure in Figure 1 and Figure 2.

[0050] The above results show that micro-alloying technology has made a breakthrough in ...

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Abstract

The invention discloses a hyper-thick non-modified plastic die steel, which comprises the following parts: 0.20-0.32% C , 0.20-0.80% Si , 1.80-2.50% Mn, 0.80-1.50% Cr, 0.20-0.60% Mo, 0.08-0.20% V, 0.0010-0.0030% B, 0.02-0.06% Ti , not more than 0.035% P, not more than 0.035% S, ferric and inevitable impurity, wherein the structure condition is bainite. The invention ensures the hardness HRC30-36 of bainite structure and pre-hardening plastic die steel, which controls the cooling speed after forging with thickness over 300mm.

Description

technical field [0001] The invention relates to a method for producing mold steel in the metallurgical industry, in particular to a method for manufacturing a large-scale plastic mold steel module. Background technique [0002] Plastic mold is an important process equipment in the plastic forming 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, a special plastic mold steel has been formed. 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 so-called pre-hardened plastic mold steel refers to the heat-processed module that is quenched and tempered in advance, through quenching treatment and high-temperature tempering treatment, to obtain a tempered sorbite structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C21D8/00C21D11/00B21J1/06
Inventor 张洪奎吴晓春罗毅徐明华续维刘笑莲罗辉闵永安汪宏斌
Owner 宝武特种冶金有限公司
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