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Heat treatment method for stainless steel heat-resistant steel forging

A heat treatment method and technology of heat-resistant steel, applied in the field of metal heat treatment, can solve the problem that the high-temperature durability does not reach the specified value, and achieve the effect of improving the high-temperature durability

Active Publication Date: 2014-04-02
重庆新承航锐科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It can be seen that the mechanical properties of the above products can meet the specified requirements, but the high-temperature durability performance has not reached the specified value (under the test temperature of 649°C and the test stress of 228MPa, the fracture time, that is, the high-temperature durability time should be greater than or equal to 25h)

Method used

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  • Heat treatment method for stainless steel heat-resistant steel forging
  • Heat treatment method for stainless steel heat-resistant steel forging
  • Heat treatment method for stainless steel heat-resistant steel forging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In the annealing step, the stainless steel heat-resistant steel forging is heated to 900°C at a rate of 30-35°C / h and kept for 7 hours, and then cooled to 450°C with the furnace and then air-cooled.

[0052] The quenching and tempering treatment includes a quenching process and a tempering process.

[0053] The quenching process is as follows:

[0054] Put stainless steel heat-resistant steel forgings into the furnace at a temperature of 200 °C;

[0055] Heating to 650°C at a rate of 100-105°C / h and holding for 2.5 hours;

[0056] Heating to 1080°C at a rate of 100-105°C / h and holding for 6.5 hours;

[0057] Oil-cooled until the surface temperature of stainless steel heat-resistant steel forgings is 150-155 ℃.

[0058] The tempering process is as follows:

[0059] Put stainless steel heat-resistant steel forgings into the furnace at a temperature of 250 °C;

[0060] Heating to 320°C at a rate of 80-85°C / h and holding for 2.5 hours;

[0061] Heating to 645°C at a r...

Embodiment 2

[0064] In the annealing step, the stainless steel heat-resistant steel forging is heated to 920°C at a rate of 45-50°C / h and kept for 8 hours, and then cooled to 500°C with the furnace and then air-cooled.

[0065] The quenching and tempering treatment includes a quenching process and a tempering process.

[0066] The quenching process is as follows:

[0067] Put stainless steel heat-resistant steel forgings into the furnace at a temperature of 450 °C;

[0068] Heating to 680°C at a rate of 125-130°C / h and holding for 3 hours;

[0069] Heating to 1090°C at a rate of 125-130°C / h and holding for 6 hours;

[0070] Oil-cooled until the surface temperature of stainless steel heat-resistant steel forgings is 165-170 ℃.

[0071] The tempering process is as follows:

[0072] Put stainless steel heat-resistant steel forgings into the furnace at a temperature of 250 °C;

[0073] Heating to 350°C at a rate of 100-105°C / h and holding for 3 hours;

[0074] Heating to 655°C at a rate of...

Embodiment 3

[0082] In the annealing step, the stainless steel heat-resistant steel forging is heated to 940°C at a rate of 70-80°C / h and kept for 9 hours, then cooled to 550°C with the furnace and then air-cooled.

[0083] The quenching and tempering treatment includes a quenching process and a tempering process.

[0084] The quenching process is as follows:

[0085] Put stainless steel heat-resistant steel forgings into the furnace at a temperature of 400 °C;

[0086] Heating to 700°C at a rate of 145-150°C / h and holding for 3.5 hours;

[0087] Heating to 1100°C at a rate of 145-150°C / h and holding for 5.5 hours;

[0088] Oil-cooled until the surface temperature of stainless steel heat-resistant steel forgings is 195-200 ℃.

[0089] The tempering process is as follows:

[0090] Put stainless steel heat-resistant steel forgings into the furnace at a temperature of 150 °C;

[0091] Heating to 380°C at a rate of 110-120°C / h and holding for 3.5 hours;

[0092] Heating to 665°C at a rat...

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Abstract

The invention relates to the metal heat treatment technical field, and especially relates to a heat treatment method for a stainless steel heat resistant steel forging, the heat treatment method can enhance the high temperature endurance performance of the treated workpieces, and is especially suitable for heat treatment of a high temperature part nozzle reinforcing ring of a 600MW steam turbine. The method comprises the following steps: adding an annealing process before quenching and tempering treatment, heating the stainless steel heat resistant steel forging with the speed of 30-80 DEG C / h to the temperature of 900-940 DEG C in the annealing step, insulating for 7-9 hours, then cooling in furnace to the temperature of 450-550 DEG C and air cooling. The method of the invention can improve the original structure of the stainless steel heat resistant steel forging and refine the grain size, and prepare for the subsequent quenching and tempering treatment; in the subsequent quenching and tempering step, by controlling a process curve and guaranteeing the condition of product strength, the grain size can be controlled at 2-4 level, and the high temperature endurance performance can be enhanced.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to a heat treatment method for stainless heat-resistant steel forgings. Background technique [0002] The existing nozzle strengthening ring for high temperature components of 600MW steam turbine is usually made of 2Cr11MoVNbN material. The heat treatment process of stainless steel heat-resistant steel forgings is as follows figure 1 , 2 As shown, including the steps of quenching and tempering, the properties of 4 sampled nozzle reinforcement rings treated by this process are shown in the following table: [0003] [0004] It can be seen that the mechanical properties of the above products can meet the specified requirements, but the high temperature endurance performance does not reach the specified value (the test temperature is 649°C and the test stress is 228MPa, the fracture time, that is, the high temperature endurance time should be greater than or equal to 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26C21D1/25C21D6/00
Inventor 杜巧林
Owner 重庆新承航锐科技股份有限公司
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