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A high-temperature homogenization treatment method for super austenitic stainless steel

A technology of austenitic stainless steel and homogenization treatment is applied in the field of austenitic stainless steel heat treatment to achieve the effect of improving composition and structure uniformity, high temperature thermoplasticity, good surface quality and improving thermoplasticity

Active Publication Date: 2019-02-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the high-temperature homogenization treatment of super austenitic stainless steel

Method used

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  • A high-temperature homogenization treatment method for super austenitic stainless steel
  • A high-temperature homogenization treatment method for super austenitic stainless steel
  • A high-temperature homogenization treatment method for super austenitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Put the cast ingot into a heating furnace, raise the temperature to 1240°C at a rate of 100°C / h, keep it warm for 24 hours, cool down to 1000°C with the furnace, and then take it out of the furnace and air-cool it.

Embodiment 2

[0029] Example 2: Put the cast ingot into the heating furnace, raise the temperature to 1260°C at a rate of 120°C / h, keep it warm for 20h, cool down to 1000°C with the furnace, and then take it out of the furnace and air-cool it.

Embodiment 3

[0030] Example 3: Put the cast ingot into a heating furnace, raise the temperature to 1280°C at a rate of 160°C / h, keep it warm for 16 hours, cool down to 1000°C with the furnace, and then take it out of the furnace and air-cool it.

[0031] After high-temperature homogenization treatment, the homogenization effect can be judged by the following characterization methods:

[0032] (1) Dendrite morphology: Observe the dendrite morphology in the core of the ingot before and after high-temperature homogenization treatment and measure the secondary dendrite spacing.

[0033] (2) Dissolution of Sigma phase: observe the size, quantity and distribution of Sigma phase before and after high-temperature homogenization treatment.

[0034] (3) Mo element segregation coefficient: use electron probe to measure interdendritic and dendrite stem Mo element content, and calculate Mo element segregation coefficient according to element segregation coefficient = interdendritic element content / dend...

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PUM

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Abstract

The invention discloses a high-temperature homogenization treatment method of super austenitic stainless steel, with the purpose of improving the composition and structure uniformity and high-temperature thermoplasticity of ingots or billets, and controlling the grain size. The target steel composition (wt%) suitable for processing by this invention is: C≤0.02, Mn≤4.00, Cr: 19.5~25.0, Ni: 17.5~23.0, Mo: 6.0~8.0, N: 0.18~0.55, Cu: 0.30~ 1.00, Si≤0.80, P≤0.030, S≤0.01, the balance is Fe. It is characterized by: brushing a layer of high-temperature oxidation-resistant coating on the surface of the ingot or billet, placing it in a heating furnace, heating it to 1240-1280°C at a rate lower than 160°C / h, and then directly performing thermal processing or after keeping it warm for 16-24 hours. It is cooled to 1000℃ and then air-cooled. The invention provides a convenient, reasonable and efficient high-temperature homogenization treatment method for super austenitic stainless steel, which significantly eliminates the element segregation and dendrite structure of ingots or billets, fully dissolves the Sigma phase back, and controls the grain size. , thus significantly improving the hot processing performance and providing technical support for obtaining super austenitic stainless steel products with good surface quality and excellent performance.

Description

technical field [0001] The invention belongs to the field of heat treatment of austenitic stainless steel, and in particular relates to a high-temperature homogenization treatment method of super austenitic stainless steel. technical background [0002] Super austenitic stainless steel contains high alloy content (chromium, molybdenum, nickel, nitrogen, etc.), has excellent pitting corrosion resistance, uniform corrosion resistance, stress corrosion resistance and good comprehensive mechanical properties, and is widely used in flue gas desulfurization , nuclear power industry and waste incineration and other very harsh environments. However, the high alloy content makes it easy to redistribute solute during solidification, especially the segregation of Mo content in the liquid phase at the front of the solidification interface is the most serious, and the low diffusion rate of other elements in austenite also aggravates the occurrence of Mo segregation. form. The segregati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/70C22C38/44C22C38/42C22C38/58C22C38/02C22C38/04C22C30/02C21D6/00
CPCC21D1/70C21D6/004C21D2211/001C22C30/02C22C38/001C22C38/02C22C38/04C22C38/42C22C38/44C22C38/58
Inventor 李花兵姜周华张树才张彬彬冯浩朱红春范思鹏苑胜龙
Owner NORTHEASTERN UNIV LIAONING
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