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QPQ technology for increasing thickness of infiltrated layer on surface of cast duplex stainless steel

A duplex stainless steel and infiltrated layer technology, applied in the field of QPQ, can solve the problems that the infiltrated layer depth is difficult to reach more than 30mm and the infiltrated layer is thin, and achieve the effects of increased wear resistance, dense infiltrated layer structure, and expanded application range

Inactive Publication Date: 2017-02-15
FUZHOU UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, great progress has been made in the research and application of ferrite nitriding on stainless steel. Although it can significantly improve the wear resistance of stainless steel, the biggest disadvantage of ferrite nitriding below 590°C is that the layer is too large. Thin, the depth of the infiltration layer is difficult to reach more than 30mm

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  • QPQ technology for increasing thickness of infiltrated layer on surface of cast duplex stainless steel
  • QPQ technology for increasing thickness of infiltrated layer on surface of cast duplex stainless steel
  • QPQ technology for increasing thickness of infiltrated layer on surface of cast duplex stainless steel

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Embodiment Construction

[0024] The following examples describe the present invention in more detail, and these examples are only descriptions of the best implementation modes of the present invention, and do not limit the scope of the present invention in any way.

[0025] Example: Melt all the ingredients in an intermediate frequency induction furnace, pour the molten steel after removing oxygen and impurities; process the air-cooled casting into a block sample of 10mm×20mm×50mm, and then do solid solution treatment in a box-type resistance furnace. The solution temperature was set at 1120°C and held for 2 hours; after the solid solution sample was preheated at 400°C for 30 minutes, it was subjected to QPQ treatment to increase the thickness of the infiltrated layer. The technical parameters of QPQ are shown in Table 2; finally, the sample was washed and dried.

[0026] The surface hardness of each sample was measured by a micro-Vickers hardness tester; the wear resistance of each sample was tested b...

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Abstract

The invention discloses a QPQ technology used for increasing thickness of an infiltrated layer on the surface of cast duplex stainless steel, wherein the QPQ technology for increasing the thickness of the infiltrated layer comprises the following processes of: cleaning, preheating, nitriding, oxidizing, cleaning and desalting, drying and polishing, wherein the main processes are the salt-bath nitriding process and the salt-bath oxidizing process. Compared with the original QPQ technology, the QPQ technology disclosed by the invention has the advantages of increasing the thickness of the infiltrated layer, and being capable of effectively shortening nitriding time and improving production efficiency under the same conditions. The QPQ technology can form a high-quality infiltrated layer with enough depth and certain hardness on the material surface within relatively short time, can remarkably improve wear resistance and corrosion resistance of the material, can reduce the risk that the material loses efficacy due to wear, expands the application range, in various fields, of stainless steel, and has remarkable economic benefits.

Description

technical field [0001] The invention belongs to the technical category of duplex stainless steel surface strengthening and modification technology, and in particular relates to a QPQ technology for increasing the thickness of a permeated layer on the surface of cast duplex stainless steel. Background technique [0002] Duplex stainless steel refers to the stainless steel whose solid solution structure is composed of austenite phase and ferrite phase. Duplex stainless steel combines the excellent toughness and weldability of austenitic stainless steel with that of ferritic stainless steel. Combining high strength and chloride stress corrosion resistance, as a weldable structural material, duplex stainless steel has developed rapidly and has been widely used in petroleum, chemical, light industry, and energy fields. However, duplex stainless steel itself has low hardness and poor wear resistance. Under normal load, it will slide relative to the contact parts, and will suffer s...

Claims

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Application Information

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IPC IPC(8): C23C8/58C22C38/44C22C38/42C22C38/04C22C38/02C22C33/06C21D1/18
CPCC21D1/18C21D6/004C21D2211/001C21D2211/005C21D2261/00C22C33/006C22C33/06C22C38/02C22C38/04C22C38/42C22C38/44C23C8/58
Inventor 向红亮吴高翔刘东
Owner FUZHOU UNIV
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