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Heat treatment technique of large-size GCr15 steel

A technology of large size and craftsmanship, applied in the field of steel heat treatment and metal processing

Inactive Publication Date: 2014-04-09
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of double liquid quenching has not yet seen application reports and patents for GCr15 steel in the heat treatment process

Method used

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  • Heat treatment technique of large-size GCr15 steel
  • Heat treatment technique of large-size GCr15 steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] a) Coat the surface of GCr15 steel with a diameter of 60mm with carbon powder and put it into the electric furnace, or put the GCr15 steel into the electric furnace and cover it with charcoal.

[0018] b) Heat the electric furnace to 840°C and keep it warm for 40 minutes; after keeping it warm, place it in water at 20-50°C to water-quench the GCr15 steel.

[0019] c) Observe the color change of the steel during the water quenching process. When the color of the steel surface becomes dark and the red color disappears completely, quickly take the product out of the water pool and place it in oil at 20-40°C for oil quenching until the temperature of GCr15 steel Not higher than oil temperature.

[0020] d) After quenching, quickly temper the sample, the tempering temperature is 180°C, and the tempering time is 2 hours.

[0021] The product is sampled and tested for hardness and wear resistance. The test results are shown in Table 1

Embodiment 2

[0023] a) Coat the surface of GCr15 steel with a diameter of 60mm with carbon powder and put it into the electric furnace, or put the GCr15 steel into the electric furnace and cover it with charcoal,

[0024] b) Heat the electric furnace to 840°C and keep it warm for 40 minutes; after keeping it warm, place it in water at 20-50°C to quench the GCr15 steel.

[0025] c) Observe the color change of the steel during the water quenching process. When the color of the steel surface becomes dark and the red color disappears completely, quickly take the product out of the water pool and place it in oil at 20-40°C for oil quenching until the temperature of GCr15 steel Not higher than oil temperature.

[0026] d) Temper the sample quickly after quenching, the tempering temperature is 250°C, and the tempering time is 2 hours.

[0027] The product is sampled and tested for hardness and wear resistance. The test results are shown in Table 1

Embodiment 3

[0029] a) Coat the surface of GCr15 steel with a diameter of 60mm with carbon powder and put it into the electric furnace, or put the GCr15 steel into the electric furnace and cover it with charcoal.

[0030] b) Heat the electric furnace to 840°C and keep it warm for 40 minutes; after keeping it warm, place it in water at 20-50°C to quench the GCr15 steel.

[0031] c) Observe the color change of the steel during the water quenching process. When the color of the steel surface becomes dark and the red color disappears completely, quickly take the product out of the water pool and place it in oil at 20-40°C for oil quenching until the temperature of GCr15 steel Not higher than oil temperature.

[0032] d) After quenching, quickly temper the sample, the tempering temperature is 380°C, and the tempering time is 2 hours.

[0033] The product is sampled and tested for hardness and wear resistance. The test results are shown in Table 1

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Abstract

The invention relates to the field of metal working, and discloses a heat treatment technique of large-size GCr15 steel, which comprises the following steps: a) heating large-size GCr15 steel with the diameter of 20-150mm to 835-850 DEG C, and keeping the temperature for 30-60 minutes; b) carrying out water quenching at the water temperature of 20-60 DEG C; c) when the color on the product surface darkens and red completely disappears, immediately taking the product out of water and carrying out oil quenching; and d) after quenching, tempering the product. The heat treatment technique adopts a double quenching method; in the GCr15 steel heat treatment quenching process, the material is firstly subjected to pre-quenching with the water medium with favorable thermal conductivity, and then subjected oil quenching after the surface layer is hardened, thereby completing the final quenching technique; and finally, the material is tempered. The technique can enable the surface layer of the large-size GCr15 steel to reach high hardness, and enhances the abrasion resistance of the material as compared with the existing technique.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to the technical field of steel heat treatment, in particular to a heat processing method for medium alloy tool steel. Background technique [0002] GCr15 steel is a kind of wear-resistant bearing steel, which can also be used as tool steel and cold work die steel. As a wear-resistant material, the surface of the material is required to have high hardness. [0003] For ordinary GCr15 steel, when the size is small, such as materials with a section width less than 20mm, after quenching and tempering, it is very easy to ensure that the hardness is above HRC58; when the section size is larger than 20mm, follow the ordinary quenching process , it is difficult to achieve a hardness above HRC58 under the requirement of a high pass rate of the product. As the hardness decreases, the wear resistance of the material will inevitably decrease. The usual way to solve this problem is to add elem...

Claims

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Application Information

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IPC IPC(8): C21D1/19C21D6/00
Inventor 邓沛然曹阳根言智徐培全
Owner SHANGHAI UNIV OF ENG SCI
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