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Quick-acting nitriding method for intergranular corrosion resistant structural steel

A kind of structural steel, corrosion-type technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of reduced thickness of compound structure layer, poor uniformity and distribution, etc., to inhibit growth and Precipitation and preparation steps are simple and convenient, and the effect of improving uniformity and uneven distribution

Inactive Publication Date: 2021-01-05
常州市汇丰天元热处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the short-term nitriding treatment in the nitriding process of structural steel, which will lead to the reduction of the thickness of the compound structure layer and the poor uniformity and distribution of the problem, the application provides a fast-acting nitriding method for intergranular corrosion-resistant structural steel, including The following steps: S1. Take the structural steel and program the temperature rise. After austenitization by heat preservation, take the heated structural steel workpiece and place it in the quenching medium for austempering and tempering, so as to obtain the tempered structural steel workpiece; S2. For tempering Structural steel workpiece surface treatment and heating, heat preservation and heating pretreatment to obtain pretreated structural steel workpiece; S3, place the pretreated structural steel workpiece in preheated nitriding medium, thermal insulation nitriding treatment and air cooling to room temperature, that is Intergranular corrosion resistant structural steel can be prepared

Method used

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  • Quick-acting nitriding method for intergranular corrosion resistant structural steel
  • Quick-acting nitriding method for intergranular corrosion resistant structural steel
  • Quick-acting nitriding method for intergranular corrosion resistant structural steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] S1. Take the structural steel and place it in a box-type resistance furnace, heat it up at 5°C / min, and after austenitization treatment for 15 minutes, after the heat preservation treatment, take the heat preservation workpiece and place it in the quenching medium immediately, and control the quenching The temperature of the medium is 55°C. After isothermal treatment in the quenching medium for 30 minutes, the isothermal treatment is completed and the isothermally quenched workpiece is collected; the isothermally quenched workpiece is collected and placed in a box-type resistance furnace, and then the temperature is raised to 580°C at 10°C / min. After heat preservation and tempering for 75 minutes, after standing to cool to room temperature, the tempered structural steel workpiece was collected;

[0032] S2. Stir and mix cerium oxide and 0.5mol / L nitric acid at a molar ratio of 1:20 and place it under 200W for ultrasonic dispersion for 10 minutes, collect the dispersed sl...

Embodiment 2

[0035] S1. Take the structural steel and put it in a box-type resistance furnace, heat it up at 5°C / min, and after austenitization treatment for 17 minutes, after the heat preservation treatment, take the heat preservation workpiece and place it in the quenching medium immediately, and control the quenching The temperature of the medium is 60°C. After isothermal treatment in the quenching medium for 32 minutes, the isothermal treatment is completed and the isothermally quenched workpiece is collected; the isothermally quenched workpiece is collected and placed in a box-type resistance furnace, and then the temperature is raised to 590°C at 10°C / min. After heat preservation and tempering for 82 minutes, after standing to cool to room temperature, the tempered structural steel workpiece was collected;

[0036] S2. Stir and mix cerium oxide and 0.5mol / L nitric acid at a molar ratio of 1:20 and place it under 250W for ultrasonic dispersion for 12 minutes, collect the dispersed slur...

Embodiment 3

[0039] S1. Take the structural steel and put it in a box-type resistance furnace, heat it up at 5°C / min, and after austenitization treatment for 20 minutes, after the heat preservation treatment, take the heat preservation workpiece and place it in the quenching medium immediately, and control the quenching The temperature of the medium is 65°C. After isothermal treatment in the quenching medium for 35 minutes, the isothermal treatment is completed and the isothermally quenched workpiece is collected; the isothermally quenched workpiece is collected and placed in a box-type resistance furnace, and then the temperature is raised to 600°C at 10°C / min. After heat preservation and tempering for 100 minutes, after standing to cool to room temperature, the tempered structural steel workpiece was collected;

[0040] S2. Stir and mix cerium oxide and 0.5mol / L nitric acid at a molar ratio of 1:20 and place it under 300W for ultrasonic dispersion for 15 minutes, collect the dispersed slu...

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Abstract

The invention relates to the field of metal treatment, and particularly discloses a quick-acting nitriding method for intergranular corrosion resistant structural steel. The quick-acting nitriding method for the intergranular corrosion resistant structural steel comprises the following steps: S1, taking the structural steel, carrying out programmed temperature rise and heat preservation austenitizing, then taking a heated structural steel workpiece, putting the heated structural steel workpiece into a quenching medium, carrying out isothermal quenching treatment, and carrying out heat preservation tempering to obtain a tempered structural steel workpiece; S2, carrying out surface treatment on the tempered structural steel workpiece, performing temperature rising heating and heat preservation heating pretreatment, and obtaining a pretreated structural steel workpiece; and S3, placing the pretreated structural steel workpiece in a preheated nitriding medium, carrying out heat preservation nitriding treatment, conducting air cooling to the room temperature, and then preparing the intergranular corrosion resistant structural steel. The quick-acting nitriding method for the structural steel is quick and effective to operate, and the problems that in the nitriding process of the structural steel, short-time nitriding treatment can cause reduction of the thickness of a compound structural layer and poor uniformity and distribution can be effectively solved.

Description

technical field [0001] The application relates to the field of metal treatment, more specifically, it relates to a quick-acting nitriding method for intergranular corrosion-resistant structural steel. Background technique [0002] Since the iron and steel industry was produced, carbon structural steel was first developed. Carbon structural steel has low surface hardness and poor corrosion resistance, so the manufactured mechanical parts often fail when they are working. Therefore, in order to improve the service life of carbon structural steel mechanical parts and ensure the stable operation of the machine, the surface of carbon structural steel mechanical parts must be treated during the production process. Nitriding is a heat treatment process in which the nitrogen atoms in the nitriding agent diffuse into the surface of the part, thereby significantly improving the surface properties of the part. [0003] The prior art can refer to the Chinese invention patent with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/62C23C8/02C21D1/25
CPCC23C8/62C23C8/02C21D1/25
Inventor 郑尧君陆立光安庆友
Owner 常州市汇丰天元热处理有限公司
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