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A kind of catalyzed infiltration method for improving low-temperature gas carburizing speed of austenitic stainless steel

A technology of austenitic stainless steel and low-temperature gas, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., to achieve the effects of reducing production costs, accelerating diffusion rate, and increasing speed

Active Publication Date: 2018-02-13
WUHAN RES INST OF MATERIALS PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rare earths are used as infiltration elements in the prior art of chemical heat treatment, and the treatment temperature is above 500°C (such as carburizing at about 900°C and nitriding at 520-560°C). A report on austenitic stainless steel carburizing at low temperature below 500 ℃ with rare earth catalyzed infiltration

Method used

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  • A kind of catalyzed infiltration method for improving low-temperature gas carburizing speed of austenitic stainless steel
  • A kind of catalyzed infiltration method for improving low-temperature gas carburizing speed of austenitic stainless steel
  • A kind of catalyzed infiltration method for improving low-temperature gas carburizing speed of austenitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Carburization and carburization of AISI316 austenitic stainless steel by low-temperature gas lanthanum chloride.

[0030] 1. Prepare gas phase carburizing agent:

[0031] According to the volume fraction of gas phase carburizing agent, the composition is (35%~15%)CO+10%H 2 +(55%~75%)N 2 , to prepare gas-phase carburizing agent, the mass of the obtained gas-phase carburizing agent per unit volume is 1.13g / L.

[0032] 2. Preparation of liquid-phase rare earth permeation agent:

[0033] A liquid-phase rare earth permeation agent composed of rare earth chloride and methanol solution, the rare earth chloride uses lanthanum chloride (LaCl) with a molecular weight of about 246 3 ); under stirring condition, 20g lanthanum chloride is completely dissolved in 100ml methanol, is mixed with liquid phase rare earth osmotic agent, obtains the unit volume liquid phase rare earth osmotic agent quality and is: lanthanum chloride 0.2g / ml, corresponding to lanthanum Element 0...

Embodiment 2

[0041] Example 2: AISI316 austenitic stainless steel is infiltrated by low-temperature gas lanthanum chloride, and carburized in a short time.

[0042] 1. Prepare gas phase carburizing agent:

[0043] According to the volume fraction of gas phase carburizing agent, the composition is (35%~15%)CO+10%H 2 +(55%~75%)N 2 , to prepare gas-phase carburizing agent, the mass of the obtained gas-phase carburizing agent per unit volume is 1.13g / L.

[0044] 2. Preparation of liquid-phase rare earth permeation agent:

[0045] A liquid-phase rare earth permeation agent composed of rare earth chloride and methanol solution, the rare earth chloride uses lanthanum chloride (LaCl) with a molecular weight of about 246 3 ); under stirring condition, 20g lanthanum chloride is completely dissolved in 100ml methanol, is mixed with liquid phase rare earth osmotic agent, obtains the unit volume liquid phase rare earth osmotic agent quality and is: lanthanum chloride 0.2g / ml, corresponding to lantha...

Embodiment 3

[0053] Example 3: AISI316 austenitic stainless steel is catalyzed and carburized by low-temperature gas mixed with rare earth chloride.

[0054] 1. Prepare gas phase carburizing agent:

[0055] According to the volume fraction of gas phase carburizing agent, the composition is (35%~15%)CO+10%H 2 +(55%~75%)N 2 , to prepare gas-phase carburizing agent, the mass of the obtained gas-phase carburizing agent per unit volume is 1.13g / L.

[0056] 2. Preparation of liquid-phase rare earth permeation agent:

[0057] The liquid-phase rare earth penetrating agent composed of rare earth chloride and methanol solution, the rare earth chloride adopts mixed rare earth chloride (29.3% LaCl 3 , 50.4% CeCl 3 , 5.1% PrCl 3 , 15.1% NdCl 3 ) Average molecular weight 247; Under stirring condition, 20g above-mentioned mixed rare earth chlorides are completely dissolved in 100ml methanol, are mixed with liquid phase rare earth osmotic agent, obtain the quality of unit volume liquid phase rare ea...

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Abstract

The invention discloses a catalytic permeation method for increasing austenite stainless steel low-temperature gas carburizing speed, and belongs to the technical field of chemical heat treatment. The gas carburizing treatment is performed for austenite stainless steel by a mixed carburizing agent at a temperature of 450-470 DEG C; the mixed carburizing agent consists of a gas-phase carburizing agent and a liquid-phase rare earth catalytic permeation agent; the gas-phase carburizing agent consists of CO, H2 and N2; the liquid-phase rare earth catalytic permeation phase consists of rare earth chloride and methanol solution; gas generated by gasifying solvent methanol of the gas-phase carburizing agent and the liquid-phase rare earth catalytic permeation agent in a carburizing furnace is formed to carburizing furnace gas; the mass fraction of the rare earth element in the liquid-phase rare earth catalytic permeation agent is 0.8-1.5% of mass fraction of the carburizing furnace gas; the treatment is kept by 24-28 h; the temperature is cooled below 150 DEG C in an original atmosphere furnace; and a corrosion-resistance strengthened carburizing layer with a surface hardness of 850-1200 HV is obtained on the austenite stainless steel. The catalytic permeation method improves the corrosion-resistance strengthened treatment efficiency of the austenite stainless steel, and reduces the production cost.

Description

technical field [0001] The invention discloses a method for accelerating carburization of austenitic stainless steel with low-temperature gas, which belongs to the technical field of chemical heat treatment. technical background [0002] Austenitic stainless steel is widely used in machinery, chemical industry, transportation, medical and health, daily life and other fields, and is currently the most used corrosion-resistant metal material. However, there is a very obvious shortcoming of austenitic stainless steel, which is that the strength of this material is not high, which is directly manifested in low surface hardness, wear resistance and fatigue resistance, which seriously affects its scope of use and service life. Surface strengthening treatment is very important. necessary. [0003] In the past, the surface strengthening methods of austenitic stainless steel for industrial applications mainly included ion implantation, surface deposition, thermal spraying, and chemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/22
CPCC23C8/22
Inventor 潘邻张良界马飞杨闽红李朋吴勉
Owner WUHAN RES INST OF MATERIALS PROTECTION
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