Compressor 38CrMoAl steel treatment technology

A compressor and process technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of not being able to reach users, improve wear resistance, reduce quenching cracks, and improve wear resistance Effect

Inactive Publication Date: 2015-09-16
SHENYANG TURBO MASCH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the traditional heat treatment method cannot meet the user's requirements

Method used

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  • Compressor 38CrMoAl steel treatment technology
  • Compressor 38CrMoAl steel treatment technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Production of ￠160mm piston pins, forging and molding, the piston pins are placed in a resistance furnace and heated to 950°C±10°C for 2 hours, and then air-cooled. After machining, carry out quenching and tempering treatment, heat in the resistance furnace to 930°C±10°C for 2 hours, take out the furnace, water cool to 150-250°C, transfer to the tempering furnace, heat to 610°C, hold for 3 hours, and then leave the furnace for air cooling. Coarse grinding allowance 0.15-0.20 mm. Clean the surface of the piston rod and place it in a nitriding furnace, add a rare earth permeation agent, and perform pre-oxidation treatment. Raise the temperature to 520°C and pass ammonia gas. When the ammonia decomposition rate reaches 18%-25%, keep it warm for 6 hours, and then raise the temperature to 550°C for ammonia decomposition. The rate is 30-55% and the temperature is kept for 10 hours. The furnace is cooled to below 250 ℃ and the furnace is air-cooled. The total nitride layer dep...

Embodiment 2

[0026] Production of ￠110mm piston rods, forging and molding, the piston pins are placed in a resistance furnace and heated to 950 ° C ± 10 ° C for 2 hours and then air-cooled. After machining, carry out quenching and tempering treatment, heat in resistance furnace to 930°C±10°C for 2 hours, leave the furnace, water cool to 150-250°C, transfer to tempering furnace, heat to 630°C, hold temperature for 3 to leave the furnace and air cool. Coarse grinding allowance 0.15-0.20 mm. Clean the surface of the piston rod and place it in a nitriding furnace, add a permeation agent, and carry out pre-oxidation treatment. Raise the temperature to 520°C and pass through the ammonia gas. The ammonia decomposition rate is 18%-25%. %Insulation for 10 hours, the furnace is cooled to below 250 ℃ and air-cooled, the total nitride layer depth is 0.55 mm, and the hardness is HV940. High-frequency quenching treatment without processing, induction heating to 930 ° C quenching cooling medium (3% PAG ...

Embodiment 3

[0028] Production of ￠300mm crosshead pins, forging and molding, the crosshead pins are placed in a resistance furnace and heated to 950°C±10°C for 3 hours, and then air-cooled. After machining, carry out quenching and tempering treatment, heat in the resistance furnace to 930°C ± 10°C for 3 hours, take out the furnace, water cool to 150°C, transfer to the tempering furnace, heat to 660°C, hold for 5 to leave the furnace and air cool. Coarse grinding allowance 0.15-0.20 mm. Clean the surface of the piston rod and place it in an ion nitriding furnace, add a permeation agent, raise the temperature to 520°C for pre-oxidation treatment, and then pass in ammonia gas. -10 Torr, heat preservation for 10 hours, furnace cooled to below 250°C, and air cooled to room temperature. The total nitride layer depth is 0.48 mm, and the hardness is HV890. High-frequency quenching treatment without processing, induction heating to 930 ° C quenching cooling medium (3% PAG type) injection, hardene...

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Abstract

The invention discloses a compressor 38CrMoAl steel treatment technology, and relates to a 38CrMoAl steel treatment hardening and tempering and surface hardening heat treatment technology. The problems of shallowness, low hardness, poor wear and acid-salt corrosion resistance and low hardening and tempering treatment mechanical performances of a hardened layer generated through traditional surface heat treatment of 38CrMoAl steel are solved in the invention. The heat treatment technology comprises the steps of 38CrMoAl steel forging and stamping molding, hardening and tempering, and surface hardening treatment. The technology disclosed in the invention can completely avoid the disadvantages of shallowness, low hardness after finish grinding, and low hardening and tempering treatment mechanical performances of traditional nitridized hardened layers, improves the surface hardness to above HRc70, improves the wear resistance by 50%, and improves the acid-salt corrosion resistance by above 40%. The mechanical performances improve by 40-50%, the bending fatigue life prolongs by above 100 times, the bending fatigue strength improves by 100%, and the fatigue strength stress concentration susceptibility is substantially inhibited.

Description

technical field [0001] The invention belongs to the heat treatment process of 38CrMoAl steel crosshead pins and piston rods of compressors, and is suitable for all compressors adopting the heat treatment process of 38CrMoAl steel crosshead pins and piston rods. It is also applicable to all other mechanical parts using 38CrMoAl steel as material. Background technique [0002] At present, the heat treatment process of 38CrMoAl steel crosshead pins and piston rods for compressors includes forging, normalizing, quenching and tempering, stress relief, nitriding (including gas and ion nitriding) heat treatment processes, and the surface hardening hardness after fine grinding can only reach Around HRc50, the wear resistance is very poor and the hardened layer is very shallow. The user proposed to improve the surface hardness, hardened layer thickness and wear resistance of 38CrMoAl steel crosshead pin and piston rod. If the traditional heat treatment method is used, the user's re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C8/26C23C8/38C21D6/00
Inventor 曲德毅高志强张婉悦
Owner SHENYANG TURBO MASCH CORP
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