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3Cr2Mo die steel heat treatment process

A technology of die steel and process, applied in the field of heat treatment process of 3Cr2Mo die steel, to achieve high thermal hardness and wear resistance, and improve the effect of structure stability

Inactive Publication Date: 2016-06-29
CHONGQING YUANHUANG MACHINERY MFG CO LTD
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  • Application Information

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Problems solved by technology

The widely used plastic mold steel 3Cr2Mo has put forward new requirements, otherwise it can only be replaced by imported high-performance steel, so the heat treatment process of its 3Cr2Mo steel needs to be further optimized and improved

Method used

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with embodiment:

[0012] A kind of 3Cr2Mo mold steel heat treatment process, comprises the following steps:

[0013] (1) Forging: heating temperature 1100°C, initial forging temperature 1080°C, final forging temperature 900°C, air cooling after forging;

[0014] (2) Annealing: Heating temperature is 850°C, holding for 3 hours, isothermal temperature is 720°C, holding for 5 hours and then furnace cooling to 500°C at a speed of 70°C / h, and air cooling after taking out the furnace;

[0015] (3) Quenching and tempering: Quenching heating temperature is 860°C, oil quenching, tempering at 540°C, surface hardness is 30-35HRC;

[0016] (4) Carburizing process: heating at 900°C×7h, oil quenching at 860°C after carburizing, and then low-temperature tempering at 220°C×2.5h, the surface hardness after carburizing and quenching is 52-65HRC.

[0017] The 3Cr2Mo die steel heat treatment process of the invention ca...

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Abstract

The present invention discloses a 3Cr2Mo die steel heat treatment process which is characterized by comprising the following steps, to be more specific, (1) forging; (2) annealing, to be more specific, heating to the temperature of 850 DEG C, performing thermal insulation for 2-4h, at isothermal temperature of 720 DEG C, performing thermal insulation for 4-6h, then cooling in a furnace to 500 DEG C, and taking out of the furnace to cool in the air; (3) quenching and tempering, to be more specific, at the quenching heating temperature of 860-870 DEG C, performing oil quenching, and at 540-580 DEG C performing tempering, wherein the surface hardness is 30-35HRC; and (4) carburizing process, to be more specific, heating at 900 DEG C for (6-8) h, after infiltration, at 850-870 DEG C performing oil quenching, and then performing low temperature tempering at 200-250 DEG C for (2-3) h. The 3Cr2Mo die steel heat treatment process can improve organizational stability of 3Cr2Mo die steel, and has high hot hardness, wear resistance and toughness and other overall performances.

Description

technical field [0001] The invention belongs to the field of heat treatment technology, in particular to a heat treatment technology of 3Cr2Mo mold steel. Background technique [0002] With the improvement of plastic production and the expansion of application fields, higher and higher requirements are put forward for plastic molds, which promotes the continuous development of plastic molds. At present, plastic molds are developing towards high efficiency, high precision, and long life, which promotes the rapid development of plastic mold materials. The widely used plastic mold steel 3Cr2Mo has put forward new requirements, otherwise it can only be replaced by imported high-performance steel, so the heat treatment process of its 3Cr2Mo steel needs to be further optimized and improved. Contents of the invention [0003] The purpose of the present invention is to address the deficiencies in the above-mentioned technologies. The present invention provides a novel heat treatm...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/26C21D8/00C23F17/00
Inventor 不公告发明人
Owner CHONGQING YUANHUANG MACHINERY MFG CO LTD
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