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Chemical heat treatment method for steel products surface

A heat treatment method and surface chemistry technology, applied in heat treatment equipment, heat treatment process control, metal material coating technology, etc., to achieve the effects of microstructure refinement, no loss of impact toughness, and increased hardness

Inactive Publication Date: 2008-10-15
李亚明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is no report on the use of nanomaterials as penetrating agents in the chemical heat treatment of steel surfaces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The surface chemical heat treatment method of steel has the following steps:

[0016] 1. Take 45 steel workpieces;

[0017] 2. Take nano-aluminum nitride infiltration agent;

[0018] 3. Take the protective tank that matches the steel workpiece;

[0019] 4. Fill the protective tank with nano-aluminum nitride infiltration agent;

[0020] 5. Bury the steel workpiece in the nano-aluminum nitride infiltration agent in the protective tank;

[0021] 6. Put the protective tank containing the nano-aluminum nitride infiltration agent and the steel workpiece in a heating furnace and heat it to 950°C, keep it at 950°C for 6 hours, take it out, cool it to room temperature, and get the surface-infiltrated nano-aluminum nitride steel workpieces;

[0022] 7. According to the heat treatment specification of workpiece steel, quench and temper the workpiece infiltrated with nano-aluminum nitride. The quenching process parameters are as follows: after the furnace temperature rises to 8...

Embodiment 2

[0025] Steps 1 to 5 and step 7 are the same as in Example 1. Step 6 is to place the protective tank containing the nano-aluminum nitride infiltration agent and the steel workpiece in a heating furnace and heat it to 950° C., and keep it for 2 hours at a temperature of 950° C. After taking it out, it is cooled to room temperature to obtain a steel workpiece with surface impregnated with nano-aluminum nitride;

[0026] The hardness of the 45 steel workpiece processed in Example 2 was HRC 63.5.

Embodiment 3

[0028] Steps 1 to 5 and Step 7 are the same as in Example 1. Step 6 is to place the protective tank containing the nano-aluminum nitride infiltration agent and the steel workpiece in a heating furnace and heat it to 950°C, and keep it for 4 hours at a temperature of 950°C. After taking it out, it is cooled to room temperature to obtain a steel workpiece with surface impregnated with nano-aluminum nitride;

[0029] The hardness of the 45 steel workpiece processed in Example 3 was HRC 64.6.

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Abstract

the invention discloses a chemical heat disposing method of steel surface, which comprises the following steps: 1. fetching steel working piece; 2. obtaining nanometer aluminium nitride permeating agent with particle size less than 100 nm; 3. heating the steel working piece to 850-1050 deg.c under the contact condition of steel working piece surface and nanometer aluminium nitride permeating agent; keeping at 850-1050 deg.c for 2-6 h; fetching the steel working piece; cooling to indoor temperature; 4. quenching and tempering the steel working piece according to heat disposing standard.

Description

technical field [0001] The invention relates to a steel surface chemical heat treatment method, in particular to a penetrating agent in the steel surface chemical heat treatment method. Background technique [0002] Steel surface chemical heat treatment is a traditional and dynamic steel surface modification technology. The chemical heat treatment of the steel surface is to heat and keep the surface of the steel workpiece to be treated in contact with the penetrating agent, so that the active elements in the penetrating agent can penetrate into the surface of the steel workpiece, and improve the steel workpiece by changing the chemical composition and structure of the surface of the steel workpiece. Surface hardness, wear resistance and corrosion resistance and other properties. After the chemical heat treatment of the steel surface, the steel must be quenched and tempered. There are solid penetrating agents and gas penetrating agents for chemical heat treatment of steel s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C23C8/60C23C8/80C21D11/00
Inventor 李亚明
Owner 李亚明
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