Nitriding treatment method for 1Cr18Ni9Ti austenitic steel

A technology of austenitic steel and nitriding treatment, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of the corrosion resistance of austenitic stainless steel, reduce the vacuum degree, ensure Internal toughness, effect of reducing oxidation cracks

Inactive Publication Date: 2018-02-23
SICHUAN QIXING ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to: Aiming at the problem that the corrosion resistance of austenitic stainless steel will be greatly reduced by nitriding treatment technology, the present invention provides a nitriding treatment method for 1Cr18Ni9Ti austenitic steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of 1Cr18Ni9Ti austenitic steel nitriding treatment method, comprises the following steps:

[0023] 1) Preliminary processing: polishing and cleaning 1Cr18Ni9Ti austenitic steel;

[0024] 2) Hardening treatment: Carry out vacuum quenching to the 1Cr18Ni9Ti austenitic steel initially processed in step 1, the quenching temperature is 874°C, the quenching time is 3h, the tempering temperature is 515°C, the tempering time is 3h, and the surface hardness after tempering is 520-540HV;

[0025] 3) Ion nitriding treatment: use an ion nitriding furnace to perform three-step treatment on the 1Cr18Ni9Ti austenitic steel after step 2) hardening;

[0026] a. Heat preservation: the temperature of the ion nitriding furnace is increased to 360°C, the vacuum degree is 50Pa, after the furnace temperature is increased to 360°C, ammonia gas is introduced, the holding time is 2h, the flow rate of ammonia gas is 15L / min, and ammonia gas is introduced for 2h Then stop the ammonia gas ...

Embodiment 2

[0034] A kind of 1Cr18Ni9Ti austenitic steel nitriding treatment method, comprises the following steps:

[0035] 1) Preliminary processing: polishing and cleaning 1Cr18Ni9Ti austenitic steel;

[0036] 2) Hardening treatment: Carry out vacuum quenching to the 1Cr18Ni9Ti austenitic steel initially processed in step 1, the quenching temperature is 880°C, the quenching time is 3h, the tempering temperature is 520°C, the tempering time is 3h, and the surface hardness after tempering is 520-540HV;

[0037] 3) Ion nitriding treatment: use an ion nitriding furnace to perform three-step treatment on the 1Cr18Ni9Ti austenitic steel after step 2) hardening;

[0038] a. Heat preservation: the temperature of the ion nitriding furnace is increased to 350°C, the vacuum degree is 40Pa, after the furnace temperature is increased to 350°C, ammonia gas is introduced, the holding time is 2h, the flow rate of ammonia gas is 16L / min, and ammonia gas is introduced for 2h Then stop the ammonia gas ...

Embodiment 3

[0043] A kind of 1Cr18Ni9Ti austenitic steel nitriding treatment method, comprises the following steps:

[0044] 1) Preliminary processing: polishing and cleaning 1Cr18Ni9Ti austenitic steel;

[0045] 2) Hardening treatment: Carry out vacuum quenching to the 1Cr18Ni9Ti austenitic steel initially processed in step 1, the quenching temperature is 860°C, the quenching time is 3h, the tempering temperature is 500°C, the tempering time is 3h, and the surface hardness after tempering is 520-540HV;

[0046] 3) Ion nitriding treatment: use an ion nitriding furnace to perform three-step treatment on the 1Cr18Ni9Ti austenitic steel after step 2) hardening;

[0047] a. Heat preservation: the temperature of the ion nitriding furnace is increased to 370°C, the vacuum degree is 60Pa, and after the furnace temperature is increased to 370°C, ammonia gas is introduced, the holding time is 2h, the flow rate of ammonia gas is 14L / min, and ammonia gas is introduced for 2h Then stop the ammonia ...

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Abstract

The invention discloses a nitriding treatment method for 1Cr18Ni9Ti austenitic steel, and relates to the technical field of metal surface modification. Aiming at the problem that the nitriding treatment technology can lead to a substantial reduction in the corrosion resistance of austenitic stainless steel, a nitriding treatment method for 1Cr18Ni9Ti austenitic steel of the present invention includes 1) preliminary processing, 2) hardening treatment, 3) nitrogen immersion heat treatment and 4) Steps such as cooling, wherein step 3) nitrogen soaking heat treatment includes heat preservation, first-stage nitriding and second-stage nitriding. The nitriding treatment method of the present invention forms a highly wear-resistant and corrosion-resistant Fe_3N compound layer on the surface of the 1Cr18Ni9Ti austenitic steel, while fully exerting the corrosion-resistant advantages of the 1Cr18Ni9Ti austenitic steel and ensuring the internal toughness of the steel, making it The surface layer has high wear resistance and fatigue resistance.

Description

technical field [0001] The invention relates to the technical field of metal surface modification, in particular to a nitriding treatment method for 1Cr18Ni9Ti austenitic steel. Background technique [0002] 1Cr18Ni9Ti austenitic steel has good corrosion resistance and is widely used in chemical, food, power generation, coal mine, marine and textile industries. However, it has low hardness and is not resistant to friction and wear. Most stainless steel parts fail prematurely due to severe wear, and a large amount of material is wasted, resulting in large economic losses. Therefore, people are constantly exploring surface modification technologies in production applications, and the conventional nitriding process is one of them. Nitriding can greatly improve the wear resistance of stainless steel parts, but due to the strong affinity between Cr and N, it is easy to combine to form CrN, resulting in the lack of Cr in the matrix and deterioration of corrosion resistance, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38
CPCC23C8/38
Inventor 江明泓
Owner SICHUAN QIXING ELECTRONICS
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