Method for shortening gas nitriding process time of structural alloy steel

A technology of alloy structural steel and process time, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of long nitriding time and low production efficiency, and increase the surface nitrogen concentration and driving force The effect of increasing and increasing activity

Active Publication Date: 2014-12-31
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of long nitriding time and low production efficiency in the nitriding process of existing alloy structural steel, and to provide a method for shortening the gas nitriding process time of alloy structural steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0019] Specific implementation mode 1: This implementation mode is a method for the nitriding process of alloy structural steel, which is specifically completed according to the following steps:

[0020] 1. Mix the infiltration agent and dry sand evenly to obtain the infiltration agent / sand mixture, and then put the infiltration agent / sand mixture into the iron drum;

[0021] The mass ratio of the quality of the infiltrating agent described in step 1 to the dry sand is 1:(2~3);

[0022] 2. Put the alloy structural steel workpiece and the iron drum containing the infiltration agent / sand mixture in the nitriding tank, seal the furnace cover, and feed ammonia gas until the volume fraction of ammonia gas in the nitriding tank is 90%. Heating evenly until the temperature of the nitriding tank is 530°C-540°C, then keeping the ammonia decomposition rate at 20%-35% and the temperature at 530°C-540°C for 20 hours, then cooling naturally with the furnace until the temperature is lower t...

specific Embodiment approach 2

[0034] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the osmotic agent described in step 1 is granular or powdery. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0035] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the penetrating agent described in step 1 is polyvinyl chloride. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for shortening the gas nitriding process time of structural alloy steel, relates to a method for shortening the gas nitriding process time of steel, and aims at solving the problems of long nitriding time and low production efficiency of an existing nitriding process of structural alloy steel. The method comprises the following steps: 1, putting an energizer / sand mixture into an iron bucket; 2, putting a structural alloy steel workpiece and the iron bucket with the energizer / sand mixture into a nitriding tank, sealing a furnace cover, introducing ammonia gas until the volume percent of the ammonia gas in a nitriding tank is 90%, uniformly heating until the temperature of the nitriding tank is 530-540 DEG C, preserving heat for 20 hours wherein the ammonia decomposition rate is 20%-35% and the temperature is 530-540 DEG C, naturally cooling to less than 150 DEG C along with a furnace, and discharging from the furnace to obtain a nitrided structural alloy steel workpiece with the nitriding layer depth of not less than 0.3 mm. The method of a nitriding process of the structural alloy steel can be obtained.

Description

technical field [0001] The invention relates to a method for shortening the process time of steel gas nitriding. Background technique [0002] Nitriding belongs to chemical heat treatment. The process of infiltrating nitrogen into the metal surface is called nitriding, also called nitriding. Nitriding can improve metal surface hardness (up to HV900-1200, equivalent to HRc65-72), wear resistance, fatigue strength and corrosion resistance. It also has the advantages of low nitriding temperature and small deformation. The commonly used temperature is 500-600°C. The disadvantage of nitriding is that the permeation layer is shallow and the process time is long. The depth of the nitriding layer is between 0.15 and 0.75 mm, and the nitriding time is between 10 and 100 hours. Such a long process time will inevitably result in low production efficiency and high energy consumption. Therefore, accelerating the nitriding speed and shortening the process time has been one of the imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26
Inventor 高枝森王淑新盛昆川梁小丹周策李应新曹利峰林延伟马春斌王立伟
Owner HARBIN TURBINE
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