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Stainless steel surface hardening process

A technology of stainless steel and stainless steel card, applied in metal material coating process, solid diffusion coating, coating, etc., can solve the problems of unsatisfactory sealing effect, shallow embedding depth, etc. Thick, excellent wear resistance effect

Active Publication Date: 2022-07-22
江苏华冶液压机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low hardness of austenitic stainless steel (~230Hv), under the extrusion force, the ferrule first undergoes plastic deformation, and the embedding depth of the ferrule on the surface of the stainless steel pipe is relatively shallow, and the sealing effect is not satisfactory.
[0003] At present, the stainless steel ferrules imported from abroad are all subjected to surface hardening treatment, but my country has not yet matured the low-temperature hardening treatment technology for austenitic stainless steel used in industrial production, so the stainless steel joints produced have to buy foreign ferrules

Method used

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  • Stainless steel surface hardening process

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] A stainless steel surface hardening process comprising the following steps:

[0032] (1) Take the stainless steel ferrule substrate, remove the surface oil, deionized water for ultrasonic cleaning for 20 minutes, dry after cleaning, and ultrasonically roll the surface of the ferrule substrate; the ultrasonic rolling process parameters are: the working static pressure is 300N, and the output amplitude is 8μm, the spindle speed is 100r / min, and the lateral feed is 0.2mm / min.

[0033] (2) Take the ferrule substrate after ultrasonic rolling, carburize the surface to form a carburized layer, and the process parameters of the carburized layer are: the voltage is 600V, the gas is a mixed gas of hydrogen and methane, and the mass ratio of the hydrogen and methane is 98:2; during carburizing, the temperature was raised to 500°C at a heating rate of 2°C / min, and the pressure was 200Pa; the carburizing time was 50h.

[0034] (3) Take the carburized ferrule substrate, soak the car...

example 2

[0037] A stainless steel surface hardening process comprising the following steps:

[0038] (1) Take the stainless steel ferrule substrate, remove the surface oil, ultrasonically clean it with deionized water for 25 minutes, dry it after cleaning, and perform ultrasonic rolling on the surface of the ferrule substrate; the ultrasonic rolling process parameters are: the working static pressure is 300N, and the output amplitude is 8μm, the spindle speed is 100r / min, and the lateral feed is 0.2mm / min.

[0039](2) Take the ferrule substrate after ultrasonic rolling, and carburize the surface to form a carburized layer. The process parameters of the carburized layer are: the voltage is 600V, the gas is a mixed gas of hydrogen and methane, and the mass ratio of the hydrogen and methane is 98:2; during carburizing, the temperature was raised to 520°C at a heating rate of 3°C / min, and the pressure was 200Pa; the carburizing time was 50h.

[0040] (3) Take the carburized ferrule substr...

example 3

[0043] A stainless steel surface hardening process comprising the following steps:

[0044] (1) Take the stainless steel ferrule substrate, remove the surface oil, deionized water for ultrasonic cleaning for 30 minutes, dry after cleaning, and ultrasonically roll the surface of the ferrule substrate; the ultrasonic rolling process parameters are: the working static pressure is 300N, and the output amplitude is 8μm, the spindle speed is 100r / min, and the lateral feed is 0.2mm / min.

[0045] (2) Take the ferrule substrate after ultrasonic rolling, and carburize the surface to form a carburized layer. The process parameters of the carburized layer are: the voltage is 600V, the gas is a mixed gas of hydrogen and methane, and the mass ratio of the hydrogen and methane is 98:2; during carburizing, the temperature was raised to 520°C at a heating rate of 3°C / min, and the pressure was 200Pa; the carburizing time was 50h.

[0046] (3) Take the carburized ferrule substrate, soak the car...

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Abstract

The invention discloses a stainless steel surface hardening process which is characterized in that ultrasonic rolling treatment is firstly carried out on the surface of stainless steel during preparation, and the process aims to improve the penetration depth of subsequent carburization, co-penetration, nitriding and other steps so as to promote ion penetration and improve the stainless steel alloy surface hardening treatment effect; the prepared stainless steel cutting sleeve has the advantages of being large in infiltrated layer thickness, and more excellent in surface hardness, toughness and wear resistance. Low-temperature carburization is carried out on the basis of the scheme, the surface brightness of the carburized stainless steel is poor, the surface of the carburized stainless steel clamping sleeve is subjected to brightening treatment, the stainless steel clamping sleeve is firstly placed in deionized water of 90-95 DEG C to be soaked and then placed in alkali liquor after being soaked in high-temperature water, so that an oxidation film on the surface of the stainless steel is loosened, and the surface brightness of the stainless steel is improved; and then the stainless steel cutting sleeve is immersed in deionized water at 90 DEG C and cold water at about 15 DEG C for alternate cooling and heating treatment, so that the loosened oxidation film is cracked and can be conveniently removed after subsequent acid pickling, and the surface of the stainless steel cutting sleeve is recovered to be bright.

Description

technical field [0001] The invention relates to the technical field of stainless steel surface hardening, in particular to a stainless steel surface hardening process. Background technique [0002] The ferrule is the most critical sealing component in the pipe joint. Under the action of the extrusion force of the external thread, the ferrule is embedded in the surface of the pipe joint to form a sealed joint. For stainless steel valves and pipe fittings, the ferrules need to be made of austenitic stainless steel. However, due to the low hardness of austenitic stainless steel (~230Hv), under the extrusion force, the ferrule first undergoes plastic deformation, and the embedding depth of the ferrule on the surface of the stainless steel tube is shallow, and the sealing effect is not satisfactory. [0003] At present, the stainless steel ferrules imported from abroad are all surface-hardened, and my country has not yet matured the low-temperature hardening treatment technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/04C23C8/22C23C8/80C23C8/34C23C8/32C22C38/44C22C38/58C23C8/02C25D3/12C25D15/00C25D5/00C25D5/20C25D5/36C23G1/19C23G1/08
CPCC21D7/04C23C8/22C23C8/80C23C8/34C23C8/32C22C38/44C22C38/58C23C8/02C25D3/12C25D15/00C25D5/007C25D5/20C25D5/36C23G1/19C23G1/088
Inventor 卞成昌
Owner 江苏华冶液压机械有限公司