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42CrMoE thermal treatment technique

A process, quenching and tempering technology, used in heat treatment furnaces, heat treatment equipment, metal material coating processes, etc., can solve the problems of low hardening hardness, poor wear resistance, acid corrosion resistance, cracks, etc., and improve wear resistance. , Improve the ability to bear heavy load, improve the effect of anti-tempering stability

Active Publication Date: 2009-02-18
SHENYANG BLOWER WORKS GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned traditional technology, provide a 42CrMoE heat treatment process for reciprocating compressors, and solve the cracks, low hardening hardness, poor wear resistance and salt corrosion resistance of 42CrMoE piston rods caused by traditional surface heat treatment. question

Method used

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  • 42CrMoE thermal treatment technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The specific steps of this embodiment are as follows:

[0031] (1) Conventional forging;

[0032] (2) Normalizing: keep warm at 880°C±10°C for 3 hours, take out the furnace and air cool to room temperature;

[0033] (3) Conventional machining;

[0034] (4) Quenching and tempering treatment: keep at 860°C for 2.5 hours, take out the oil and cool to room temperature, transfer to a tempering furnace and heat to 580°C for 4 hours, take out the oven and air cool to room temperature;

[0035] (5) Conventional semi-finishing: generally used for cutting with relatively high geometric tolerance requirements for parts, in order to leave a small machining allowance for finishing, it can be flexibly used according to the tolerance requirements of parts and the characteristics of processing materials;

[0036] (6) Stress relief treatment: stress relief treatment at 560°C for 4 hours, and furnace cooling to room temperature;

[0037] (7) Conventional coarse grinding;

[0038](8) ...

Embodiment 2

[0049] The difference from Example 1 is:

[0050] (1) Conventional forging;

[0051] (2) Normalizing treatment: heat preservation at 880°C±10°C for 2 hours, take out the furnace and air cool to room temperature;

[0052] (3) Conventional machining;

[0053] (4) Quenching and tempering treatment: keep at 880°C for 2 hours, take out the oil and cool to room temperature, transfer to the tempering furnace and heat to 600°C for 2.5 hours, take out the oven and air cool to room temperature;

[0054] (5) Conventional semi-finishing;

[0055] (6) Stress relief treatment: stress relief treatment at 550°C for 5 hours, and cool to room temperature in the furnace;

[0056] (7) Conventional coarse grinding;

[0057] (8) Nitriding treatment: the pre-oxidation temperature of nitriding starts from 450°C to 510°C-520°C, and the heating rate is 100°C / hour; then, ammonia supply is started, and active rare earth catalytic nitriding is carried out; the ammonia decomposition rate is 18% , furn...

Embodiment 3

[0063] (1) Conventional forging;

[0064] (2) Normalizing treatment: heat preservation at 880°C±10°C for 4 hours, take out the furnace and air cool to room temperature;

[0065] (3) Conventional machining;

[0066] (4) Quenching and tempering treatment: keep at 850°C for 6 hours, take out the oil and cool to room temperature, transfer to the tempering furnace and heat to 560°C for 6 hours, take out the oven and air cool to room temperature;

[0067] (5) Conventional semi-finishing;

[0068] (6) Stress relief treatment: stress relief treatment at 570°C for 3 hours, then furnace cooled to room temperature;

[0069] (7) Conventional coarse grinding;

[0070] (8) Nitriding treatment: the pre-oxidation temperature of nitriding starts from 450°C to 510°C-520°C, and the heating rate is 100°C / hour; then, start to supply ammonia and carry out active rare earth catalytic nitriding; the ammonia decomposition rate is 25% , furnace pressure 70 mm water column, keep warm for 16 hours; t...

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Abstract

The invention belongs to a heat processing technique of 42CrMoE material used for a reciprocating compressor. The technique is suitable for the heat processing technique for the 42CrMoE piston rods used for all the reciprocating compressors and can also be applied to the mechanical devices which require high rigidity, wear resistance and corrosion resistance. The invention can solve the problems of cracks, low surface hardening rigidity as well as poor wear resistance, poor acid resistance and poor corrosion resistance generated when the traditional surface heating processing technique is applied to the 42CrMoE piston rod, and the like. The invention includes the forging and shaping, hardening and tempering, stabilizing, nitriding, middle frequency or high frequency quenching as well as low temperature annealing of the 42CrMoE material; a surface compounded heat processing technology combined with nitriding and middle frequency or high frequency quenching is adopted: the 42CrMoE material is arranged in a nitriding furnace; ammonia gas is pumped in after the treatments of temperature rising and pro-oxidation to carry out nitriding treatment; then the middle frequency or high frequency quenching on the surface is carried out. The heat processing technique can be adopted to completely prevent the quenching cracks generated during the traditional high frequency quenching, improve the surface rigidity to be more than HRC60, improve the wear resistance by 34 percent and improve the acid and corrosion resistance by 40 percent.

Description

Technical field: [0001] The invention belongs to the heat treatment process of 42CrMoE material used in reciprocating compressors, and is applicable to the heat treatment process of 42CrMoE piston rods used in all reciprocating compressors. It can also be applied to mechanical equipment requiring high hardness, wear resistance and corrosion resistance. Background technique: [0002] At present, the heat treatment process of 42CrMoE piston rod for reciprocating compressors includes forging, normalizing, quenching and tempering, stress relief, high-frequency quenching and low-temperature tempering heat treatment processes. The surface hardening hardness can only reach about HRC50, and the wear resistance is very poor. The user proposed to improve the surface hardness and wear resistance of the 42CrMoE piston rod. If the traditional heat treatment method is used to increase the hardness value, it will often cause surface quenching cracks and be scrapped or broken during the us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C21D8/06C21D9/00C21D1/00C23C8/26C21D1/18
Inventor 曲德毅王洪范
Owner SHENYANG BLOWER WORKS GROUP CORP
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