Medium carbon steel quenching treatment process capable of reducing quenching cracking

A technology of quenching cracking and treatment process, applied in the direction of quenching agent, heat treatment equipment, metal material coating process, etc., can solve the problems of uneven distribution, reducing the quality of workpieces, and stress cracking of quenched workpieces.

Inactive Publication Date: 2020-07-07
马鞍山市鑫龙特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the concentration and uneven distribution of stress in the existing quenching process, stress cracking of the quenched workpiece is very easy to occur, thereby reducing the quality of the workpiece and increasing the reject rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A medium carbon steel quenching process for reducing quenching cracking, comprising the following steps:

[0074] (1) Preprocessing:

[0075] Add the medium-carbon steel workpiece to the resistance furnace and heat it to 400°C, keep it warm for 30 minutes, then add it to the polyethylene glycol composite aqueous solution for immersion, and at the same time perform an ultrasonic treatment, the immersion time is 20 minutes, and the ultrasonic treatment is 2 minutes; then take it out , dried to constant weight, the preparation method of polyethylene glycol composite aqueous solution is: add polyethylene glycol, rare earth nitrate, stearate, glycerin to clean water in sequence, and stir at 500r / min at 45°C for 30min , to obtain polyethylene glycol composite aqueous solution; wherein, the weight ratio of polyethylene glycol, rare earth nitrate, stearate, glycerin and clear water is: 18:0.011:3:6:80. The rare earth nitrate is lanthanum nitrate. The stearate is sodium steara...

Embodiment 2

[0080] A medium carbon steel quenching process for reducing quenching cracking, comprising the following steps:

[0081] (1) Preprocessing:

[0082] Add the medium-carbon steel workpiece to the resistance furnace and heat it to 460°C, keep it warm for 40 minutes, then add it to the polyethylene glycol composite aqueous solution for immersion, and at the same time perform an ultrasonic treatment, the immersion time is 25 minutes, and the ultrasonic treatment is 5 minutes; then take it out , dried to constant weight, the preparation method of polyethylene glycol composite aqueous solution is: add polyethylene glycol, rare earth nitrate, stearate, glycerin to clean water in sequence, and stir at 500r / min at 45°C for 30min , to obtain polyethylene glycol composite aqueous solution; wherein, the weight ratio of polyethylene glycol, rare earth nitrate, stearate, glycerin and clear water is: 21:0.013:4:8:90. The rare earth nitrate is lanthanum nitrate. The stearate is sodium steara...

Embodiment 3

[0087] A medium carbon steel quenching process for reducing quenching cracking, comprising the following steps:

[0088] (1) Preprocessing:

[0089] Add the medium carbon steel workpiece to the resistance furnace and heat it to 420°C, keep it warm for 35 minutes, then add it to the polyethylene glycol composite aqueous solution for immersion, and perform an ultrasonic treatment at the same time, the immersion time is 22 minutes, and the ultrasonic treatment is 3 minutes; then take it out , dried to constant weight, the preparation method of polyethylene glycol composite aqueous solution is: add polyethylene glycol, rare earth nitrate, stearate, glycerin to clean water in sequence, and stir at 500r / min at 45°C for 30min , to obtain polyethylene glycol composite aqueous solution; wherein, the weight ratio of polyethylene glycol, rare earth nitrate, stearate, glycerin and clear water is: 20:0.012:3.5:7:82. The rare earth nitrate is lanthanum nitrate. The stearate is sodium stea...

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Abstract

The invention discloses a medium carbon steel quenching treatment process capable of reducing quenching cracking, and relates to the technical field of quenching media. The medium carbon steel quenching treatment process comprises the following steps of (1) pretreatment: adding a medium carbon steel workpiece into a resistance furnace, heating to 400-460 DEG C, keeping the temperature for 30-40 minutes, adding into a polyethylene glycol composite water solution for impregnating, carrying out primary ultrasonic treatment, taking out, and drying to constant weight; and (2) quenching treatment:adding the pretreated medium carbon steel workpiece into the resistance furnace for heating and heat preservation, then rapidly transferring the medium carbon steel workpiece into a first salt bath tank for isothermal treatment for 35-40 min, then rapidly transferring the medium carbon steel workpiece into a second salt bath tank for isothermal treatment for 30-35 min, then transferring the mediumcarbon steel workpiece into a quenching medium for quenching, and carrying out secondary ultrasonic treatment at the same time, finally, cleaning and drying to constant weight to obtain the product.The medium carbon steel workpiece is treated through the first salt bath tank and the second salt bath tank, a boriding layer can be formed on the surface of the medium carbon steel in a permeating mode, and the hardness of the surface of the medium carbon steel workpiece is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of quenching media, in particular to a medium-carbon steel quenching process for reducing quenching cracking. Background technique [0002] Medium carbon steel is carbon steel with a carbon content of 0.25% to 0.60%. It includes most of the high-quality carbon structural steel and some ordinary carbon structural steel. Most of these steels are used to make various mechanical parts, and some are used to make engineering structural parts. [0003] The quenching of steel is to heat the steel to a temperature above the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel), keep it warm for a period of time to make it fully or partially austenitized, and then cool it with a cooling rate greater than the critical cooling rate. A heat treatment process for rapid and rapid cooling below Ms (or isothermal near Ms) for martensite (or bainite) transformation. Usually, the solid solution treatm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D1/607C21D1/04C23C8/42
CPCC21D1/04C21D1/607C21D6/00C21D2211/001C21D2211/008C23C8/42
Inventor 高欣王军
Owner 马鞍山市鑫龙特钢有限公司
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