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Thermal treatment method for ultralow-temperature high-strength steel for compressor

A heat treatment method and technology for high-strength steel, applied in the field of heat treatment technology, can solve the problem that the strength and plastic impact toughness cannot be guaranteed to be satisfied.

Active Publication Date: 2019-07-05
SHENYANG TURBO MASCH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 25Cr2Ni3Mo steel treated according to the traditional heat treatment method cannot guarantee to meet the requirements of the standard API 617 petroleum, chemical and gas industry centrifugal compressors for the strength, plasticity and especially the impact toughness of ultra-low temperature high-strength steel.

Method used

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  • Thermal treatment method for ultralow-temperature high-strength steel for compressor

Examples

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Effect test

Embodiment 1

[0033] In this embodiment, the workpiece to be heat-treated is a workpiece made of 25Cr2Ni3Mo steel with a maximum diameter of Φ210mm.

[0034] A heat treatment method for ultra-low temperature high-strength steel for compressors, comprising:

[0035] S100. Normalizing treatment: heat the furnace temperature to 900°C, put 25Cr2Ni3Mo steel into the furnace, heat the 25Cr2Ni3Mo steel to 910°C at a heating rate of 100°C / hour, and the holding time is 7 hours for effective thickness mm / 25mm , out of the oven and air-cooled;

[0036] S200, the first quenching treatment: heat the furnace temperature to 880°C, put 25Cr2Ni3Mo steel into the furnace, heat the 25Cr2Ni3Mo steel to 880°C at a heating rate of 100°C / hour, the holding time is effective thickness mm / 25mm hours, and the holding time is After 7 hours, use 8%-10% PAG solution oil to cool below 50°C, and then air cool to room temperature;

[0037] S300, the second quenching treatment: heat the furnace temperature to 820°C, put 2...

Embodiment 2

[0045] In this embodiment, the workpiece to be heat-treated is a workpiece made of 25Cr2Ni3Mo steel with a maximum diameter of Φ50 mm.

[0046] A heat treatment method for ultra-low temperature high-strength steel for compressors, comprising:

[0047] S100. Normalizing treatment: heat the furnace temperature to 890°C, put 25Cr2Ni3Mo steel into the furnace, heat the 25Cr2Ni3Mo steel to 910°C at a heating rate of 90°C / hour, and the holding time is effective thickness mm / 30mm hours, and the holding time is 1.5 hours , out of the oven and air-cooled;

[0048] S200, the first quenching treatment: heat the furnace temperature to 870°C, put 25Cr2Ni3Mo steel into the furnace, heat the 25Cr2Ni3Mo steel to 890°C at a heating rate of 100°C / hour, the holding time is effective thickness mm / 27mm hours, and the holding time is After 1.5 hours, use 8%-10% PAG solution oil to cool below 50°C, and then air cool to room temperature;

[0049] S300, the second quenching treatment: heat the furna...

Embodiment 3

[0057] In this embodiment, the workpiece to be heat-treated is a workpiece made of 25Cr2Ni3Mo steel with a maximum diameter of Φ80mm.

[0058] A heat treatment method for ultra-low temperature high-strength steel for compressors, comprising:

[0059] S100. Normalizing treatment: heat the furnace temperature to 870°C, put 25Cr2Ni3Mo steel into the furnace, heat the 25Cr2Ni3Mo steel to 920°C at a heating rate of 95°C / hour, and keep the holding time for effective thickness mm / 29mm for 2 hours. , out of the oven and air-cooled;

[0060] S200, the first quenching treatment: heat the furnace temperature to 860°C, put 25Cr2Ni3Mo steel into the furnace, heat the 25Cr2Ni3Mo steel to 880°C at a heating rate of 100°C / hour, the holding time is effective thickness mm / 25mm hours, and the holding time is After 2 hours, use 8%-10% PAG solution oil to cool to below 50°C, and then air cool to room temperature;

[0061] S300, the second quenching treatment: heat the furnace temperature to 810°...

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Abstract

The invention discloses a thermal treatment method for an ultralow-temperature high-strength steel for a compressor. An existing thermal treatment process for 25Cr2Ni3Mo steel improves a normalizing temperature, a quenching temperature, quenching times, a cooling medium, tempering times and a cooling medium on the basis of normalizing, quenching and tempering, and adds quenching times, tempering times and cryogenic treatment. The 25Cr2Ni3Mo steel material treated by the thermal treatment method can improve tensile strength and yield strength by 5%, improves plasticity by 10%, can improve low-temperature impact toughness by 30% or more, and can meet requirements, on strength, plasticity, especially impact toughness of ultralow-temperature high-strength steel, in a centrifugal compressor forstandard API617 petroleum, chemistry and gas industry.

Description

technical field [0001] The invention relates to the technical field of heat treatment technology, in particular to a heat treatment method for ultra-low temperature high-strength steel used in compressors. Background technique [0002] At present, the normalizing temperature of the heat treatment process of 25Cr2Ni3Mo steel generally uses a low-temperature furnace to heat up to 850-860°C for heat preservation, and the heat preservation time is effective thickness mm / 40-45mm hours, and not less than 2.0h. Use a low-temperature furnace to raise the temperature to 840-860°C for heat preservation. The heat preservation time is effective thickness mm / 40-45mm for hours, and not less than 2.5 hours. After being out of the furnace, the oil is cooled to room temperature. Directly carry out the heat treatment process of 550-580°C, the holding time is effective thickness mm / 40-50mm hours, and not less than 3.5h tempering and air cooling. The 25Cr2Ni3Mo steel treated according to the t...

Claims

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Application Information

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IPC IPC(8): C21D1/28C21D1/18C21D6/04C21D1/773
CPCC21D1/18C21D1/28C21D1/773C21D6/004C21D6/04
Inventor 曲德毅闫卓于晃陈炜邹鹏刘业超张博任延明
Owner SHENYANG TURBO MASCH CORP
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