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Forging and heat treatment method for martensite heat-resistant stainless steel special-shaped forge piece

A technology of heat-resistant stainless steel and heat treatment methods, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve problems such as difficulty in meeting final performance requirements, complex production process, and many forging fires, and achieve grain size refinement, Effect of improving composition segregation and lowering forging temperature

Active Publication Date: 2022-03-15
重庆新承航锐科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the forging process of special-shaped parts, due to the complex production process and many times of forging, the grains are coarse and mixed crystals exist, which makes it difficult to meet the final performance requirements.

Method used

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  • Forging and heat treatment method for martensite heat-resistant stainless steel special-shaped forge piece
  • Forging and heat treatment method for martensite heat-resistant stainless steel special-shaped forge piece
  • Forging and heat treatment method for martensite heat-resistant stainless steel special-shaped forge piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for forging and heat treating a martensitic heat-resistant stainless steel special-shaped forging, comprising the following steps:

[0045] The raw materials are smelted, and the smelting process is the process of EF+LF+VD+Electroslag on the raw materials.

[0046] After the smelting treatment, the raw materials are heated in a natural gas furnace. After the heating parameter in the natural gas furnace is 600°C for 2 hours, the temperature is raised to 800°C for 3 hours, and then the temperature is raised to 1190°C for 5 hours. After heating, carry out forging with five fires:

[0047] The first fire: thicken the billet, and hold the temperature at 1190°C for 2.5 hours after forging.

[0048] The second fire: Punch the billet with a punch, and keep the temperature at 1190°C for 2 hours after forging.

[0049] The third fire time: the billet is reamed with a horse rod, and the heat preservation temperature is 1190°C for 1.5 hours after forging.

[0050] The fou...

Embodiment 2

[0058] A method for forging and heat treating a martensitic heat-resistant stainless steel special-shaped forging, comprising the following steps:

[0059] The raw materials are smelted, and the smelting process is the process of electric furnace + LF + VD + ESR for raw materials.

[0060] After the smelting treatment, the raw materials are heated in a natural gas furnace. After the heating parameter in the natural gas furnace is 600°C for 2.5 hours, the temperature is raised to 750°C for 4 hours, and then the temperature is raised to 1230°C for 4 hours. After heating, carry out forging with five fires:

[0061] The first fire: thicken the billet, and hold the temperature at 1190°C for 2.5 hours after forging.

[0062] The second firing: the billet is punched through the hole with a punch, and the heat preservation temperature is 1190°C for 2 hours after forging.

[0063] The third fire time: the billet is reamed with a horse rod, and the heat preservation temperature is 119...

Embodiment 3

[0072] A method for forging and heat treating a martensitic heat-resistant stainless steel special-shaped forging, comprising the following steps:

[0073] The raw materials are smelted, and the smelting process is the process of EF+LF+VD+Electroslag on the raw materials.

[0074] After the smelting treatment, the raw materials are heated in a natural gas furnace. After the heating parameter in the natural gas furnace is 600°C for 1.5 hours, the temperature is raised to 850°C for 2 hours, and then the temperature is raised to 1150°C for 6 hours. After heating, carry out forging with five fires:

[0075] The first fire: thicken the billet, and hold the temperature at 1190°C for 2.5 hours after forging.

[0076] The second firing: the billet is punched through the hole with a punch, and the heat preservation temperature is 1190°C for 2 hours after forging.

[0077] The third fire time: the billet is reamed with a horse rod, and the heat preservation temperature is 1190°C for 1...

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Abstract

The invention provides a martensite heat-resistant stainless steel special-shaped forge piece forging and heat treatment method which comprises the following steps that raw materials are heated in a natural gas furnace and then subjected to first-heating-number forging, second-heating-number forging, third-heating-number forging and fourth-heating-number forging, and after the fourth-heating-number forging is finished, blanks are put into the natural gas furnace to be subjected to heat preservation; then fifth heating number forging is carried out, the blank is put into the die to be subjected to upsetting, the special punch is used for shaping the blank to the product process size, and product forging is completed; and performing heat treatment on the forged product. According to the method, the impact energy and grain size refining method of the martensitic stainless steel special-shaped forge piece is finally improved by adjusting the chemical components and optimizing the process, so that the performance requirement is met.

Description

technical field [0001] The invention is applied to the technical field of processing stainless steel special-shaped forgings, and in particular relates to a preparation and heat treatment method for martensitic heat-resistant stainless steel special-shaped forgings. Background technique [0002] X19CrMoNbVN11-1 belongs to a kind of martensitic heat-resistant stainless steel. It is often used in extreme high-pressure environments such as supercritical and ultra-supercritical steam turbine units for nuclear power / thermal power because of its high performance, long life, and high safety and reliability. However, in the forging process of special-shaped parts, due to the complex production process and many times of forging, the grains are coarse and mixed crystals exist, which makes it difficult to meet the final performance requirements. Therefore, how to improve the production process to meet the performance requirements and achieve a breakthrough in the key technology of core...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/26C21D6/00C21D8/00C21D9/00C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/54C22C38/60B21J5/00
CPCC21D1/18C21D6/004C21D6/005C21D6/008C21D1/26C21D8/005C21D9/0068C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/001C22C38/54C22C38/06C22C38/008C22C38/60C22C38/002B21J5/002
Inventor 张煌杜巧林刘鹏李文明
Owner 重庆新承航锐科技股份有限公司
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