Nitriding method of stainless steel

A technology of stainless steel and nitriding furnace, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc. It can solve the problems of unqualified quality and achieve the effect of good quality, fast speed and high efficiency

Active Publication Date: 2017-06-20
HARBIN TURBINE +1
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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 solve the problem that the quality of 1Cr11MoNiWVNbN, 2Cr12MoV, 2Cr10MoVNbN stainless steel is easily unqualified when using the existing gas nitriding method for nitriding, and to propose a stainless steel nitriding method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0013] Specific embodiment one: stainless steel nitriding method in the present embodiment, this method is as follows: stainless steel is packed in the nitriding furnace,

[0014] 1. The first stage of chlorination: at a temperature of 620°C-630°C, the ammonia decomposition rate is 70-75%, and the ammonia flow rate is 3-4m 3 Treat stainless steel for 10 hours under the condition of / h;

[0015] 2. The second stage of chlorination: at a temperature of 620°C-630°C, the ammonia decomposition rate is 75-80%, and the ammonia flow rate is 2-3m 3 Treat stainless steel for 2 hours under the condition of / h;

[0016] 3. Chlorine removal: at a temperature of 635°C-645°C, the ammonia decomposition rate is 80-90%, and the ammonia flow rate is 1-2m 3 Treat stainless steel for 2 hours under the condition of / h;

[0017] Under the condition of nitrogen protection, the temperature of the furnace is lowered to 150°C, and the furnace is air-cooled to complete the nitriding of stainless steel...

specific Embodiment approach 2

[0018] Embodiment 2: This embodiment is different from Embodiment 1 in that the stainless steel is 1Cr11MoNiWVNbN, 2Cr12MoV or 2Cr10MoVNbN. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0019] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the power of the nitriding furnace is 70KW. Others are the same as those in the first or second embodiment.

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Abstract

The invention relates to a nitriding method of stainless steel, in particular to a gas nitriding method of 1Cr11MoNiWVNbN, 2Cr12MoV and 2Cr10MoVNbN stainless steel. The purpose of the invention is to solve the problem that when nitriding is conducted on the 1Cr11MoNiWVNbN, 2Cr12MoV and 2Cr10MoVNbN stainless steel through an existing gas nitriding method, the situation that the quality is unqualified is very liable to occur. The nitriding method comprises the steps that the stainless steel is put in a nitriding furnace, and the first section of chlorinating is conducted; the second section of chlorinating is conducted; and chlorine removing is conducted. The method has the advantages of high speed, high efficiency, good quality and the like; the nitriding time is shortened more than one time than that of traditional gas nitriding; the indexes of the layer depth, hardness, crack and the like of nitriding are all meet the technical requirements; and the qualification rate of nitriding reaches 100%. The invention belongs to the technical field of stainless steel nitriding.

Description

technical field [0001] The invention relates to a stainless steel nitriding method, in particular to a gas nitriding method for 1Cr11MoNiWVNbN, 2Cr12MoV, 2Cr10MoVNbN stainless steel. Background technique [0002] When 1Cr11MoNiWVNbN, 2Cr12MoV, 2Cr10MoVNbN and other stainless steels are nitrided by the traditional gas nitriding method, the qualified rate is extremely low, the nitriding time is long, the efficiency is low, and the nitriding quality is difficult to guarantee. Contents of the invention [0003] The purpose of the present invention is to solve the problem that the quality of 1Cr11MoNiWVNbN, 2Cr12MoV, 2Cr10MoVNbN stainless steel is easily unqualified when using the existing gas nitriding method for nitriding, and propose a stainless steel nitriding method. [0004] Stainless steel nitriding method, the method is as follows: put stainless steel into the nitriding furnace, [0005] 1. The first stage of chlorination: at a temperature of 620°C-630°C, the ammonia d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26C23C8/02
CPCC23C8/02C23C8/26
Inventor 李肖霞徐佰明李万军戚金业王淑新蒲海亮刘长雁
Owner HARBIN TURBINE
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