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Heat treatment process for high-wear-resistance round-link chain

A technology of circular link chain and heat treatment method, which is applied in the direction of heat treatment furnace, heat treatment equipment, metal material coating process, etc., and can solve problems such as easy cracking of link weld joints, insufficient understanding of temper brittleness, and unstable dimensional pitch. , to achieve the effect of short service life, high production efficiency and high quality rate

Inactive Publication Date: 2019-02-12
徐贲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At the same time, there are generally some quality problems in our country's slag-removing round link chain products: chain link welds are prone to cracking, unstable size and pitch, and short service life.
At present, the heat treatment process for circular chains in China is mainly continuous quenching and tempering. However, due to insufficient understanding of the tempering brittleness of martensitic heat treatment, the chain often has failures such as chain breakage during use.
Therefore, the existing circular chain still needs to be improved

Method used

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  • Heat treatment process for high-wear-resistance round-link chain
  • Heat treatment process for high-wear-resistance round-link chain
  • Heat treatment process for high-wear-resistance round-link chain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] refer to figure 2 and 3 , heat treatment of the circular link chain.

[0057] (1) First, raise the temperature of the empty furnace to 700°C, and at the same time turn on the circulating cooling water to control the furnace temperature, feed propane gas into the furnace to carburize the empty furnace, and continue to heat up until the furnace temperature reaches the carburizing temperature of 920°C, and the carbon potential is 1.0 %, heat preservation for carburizing for 8h;

[0058] (2) After the above carburizing, reduce the carbon potential to 0.9%, and carry out carburizing for 7 hours with heat preservation;

[0059] (3) After the above-mentioned carburizing is completed, the carbon potential drops to 0.7%, and the carburizing is carried out for 7 hours with heat preservation;

[0060] (4) After the carburizing is completed, the furnace temperature is lowered to 810°C, the carbon potential is 0.7%, and the heat preservation is carried out for 1 hour for deep ca...

Embodiment 2

[0065] refer to figure 2 and 3 , heat treatment of the circular link chain.

[0066] (1) First, raise the temperature of the empty furnace to 800°C, turn on the circulating cooling water at the same time, pass propane gas into the furnace to carburize the empty furnace, continue to heat up until the furnace temperature reaches the carburizing temperature of 930°C, and the carbon potential is 1.1%. Carburizing 8h;

[0067] (2) After the above carburizing, reduce the carbon potential to 1.0%, and keep warm for 7 hours;

[0068] (3) After the above-mentioned carburizing is completed, the carbon potential drops to 0.8%, and the carburizing is carried out for 7 hours with heat preservation;

[0069] (4) After the carburizing is completed, the furnace temperature is lowered to 810°C, the carbon potential is 0.8%, and the deep carburizing is carried out by holding for 1 hour;

[0070] (5) After carburizing, use 169 rapid quenching oil for quenching and cooling. The medium temper...

Embodiment 3

[0074] refer to figure 2 and 3 , heat treatment of the circular link chain.

[0075] (1) First, raise the temperature of the empty furnace to 750°C, turn on the circulating cooling water at the same time, pass propane gas into the furnace for carburizing the empty furnace, continue to heat up until the furnace temperature reaches the carburizing temperature of 925°C, and the carbon potential is 1.1%. Carburizing 8h;

[0076] (2) After the above carburizing, reduce the carbon potential to 0.9%, and carry out carburizing for 7 hours with heat preservation;

[0077] (3) After the above-mentioned carburizing is completed, the carbon potential drops to 0.7%, and the carburizing is carried out for 7 hours with heat preservation;

[0078] (4) After the carburizing is completed, the furnace temperature is lowered to 825°C, the carbon potential is 0.8%, and the deep carburizing is carried out by holding for 1 hour;

[0079] (5) After carburizing, use 169 rapid quenching oil for qu...

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Abstract

The invention discloses a heat treatment method for a round-link chain and the round-link chain obtained through treatment by the method. The heat treatment method for the round-link chain comprises the following steps that (1) carburization treatment is performed on the to-be-treated round-link chain at the first treatment temperature, wherein the carburization treatment comprises a strong carburization stage and a diffusion stage; (2) carburization and quenching treatment is performed on the product obtained in the step (1) at the second treatment temperature to obtain a carburized and quenched product; (3) first tempering treatment and air cooling are performed on the carburized and quenched product to obtain a first tempered product; and (4) second tempering treatment and air cooling are performed on the first tempered product to obtain the round-link chain product. According to the heat treatment method for the round-link chain, the carburization and tempering processes are optimized so that the wear resistance and the corrosion resistance of the round-link chain product can be remarkably improved, and the production efficiency and the superior product rate are high.

Description

technical field [0001] The invention relates to the field of machining technology, in particular to a heat treatment method for a circular link chain and a circular link chain obtained by processing the method. Background technique [0002] The circular link chain is a key vulnerable part of various mechanical equipment. It has a large demand and high technical requirements. It must have high strength, high wear resistance and good elongation performance. With the rapid development of my country's economy, the degree of mechanization is getting higher and higher, and industrial production safety and production automation are getting more and more attention and popularization, which puts forward higher requirements for the quality of circular link chains. [0003] Circular link chains play a vital role in lifting, hoisting and slag removal in the fields of mining, ships and thermal power generation. According to different standards and quality grades, mining circular chains c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C21D1/18C21D9/00C21D6/00C22C38/44C22C38/02F16G13/12
CPCC21D1/18C21D6/004C21D6/005C21D6/008C21D9/0087C22C38/002C22C38/02C22C38/44C23C8/22F16G13/12
Inventor 徐贲金晨
Owner 徐贲
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