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Grain boundary engineering process method for improving corrosion resistance of stainless steel 316

An engineering process, stainless steel technology, applied in the field of deformation and heat treatment of metal materials, can solve the problems of long-time annealing, unfavorable cost control, etc., and achieve the effect of easy operation, simple process and obvious economic benefits

Inactive Publication Date: 2015-05-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the first process requires long-time annealing, and the second process requires repeated cold working and annealing. These two processes are not conducive to cost control in industrial production.

Method used

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  • Grain boundary engineering process method for improving corrosion resistance of stainless steel 316
  • Grain boundary engineering process method for improving corrosion resistance of stainless steel 316
  • Grain boundary engineering process method for improving corrosion resistance of stainless steel 316

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The 316 stainless steel (mass percentage of composition: 16.68 Cr, 10.20 Ni, 1.15 Mn, 0.46 Si, 2.07Mo, 0.058 C, Fe balance) plate was kept at 1100°C for 30min, and stretched and deformed by 5% at room temperature after water cooling, and then Incubate at 1100°C for 30 minutes, and obtain sample A after water cooling. As determined by EBSD (electron back scatter diffraction, electron backscatter diffraction) method, the proportion of low ΣCSL grain boundaries in sample A is 77.4%. As determined by the EBSD method, the proportion of low ΣCSL grain boundaries in the sample B not treated by the process of the present invention is 44.3%. Low ΣCSL grain boundaries are counted according to the Palumbo-Aust standard. Samples A and B were kept at 650°C for 12 hours and then air-cooled as a sensitization treatment to prepare samples for stress corrosion cracking experiments.

[0024] In this example, a C-ring corrosion sample is prepared according to GB / T 15970.5-1998. The corr...

Embodiment 2

[0029] The 316 stainless steel (mass percentage of composition: 16.68 Cr, 10.20 Ni, 1.15 Mn, 0.46 Si, 2.07Mo, 0.058 C, Fe balance) plate was kept at 1050°C for 30min, stretched by 7% at room temperature after water cooling, and then Insulate at 1050°C for 30 minutes, and obtain sample C after water cooling. As determined by EBSD (electron back scatter diffraction, electron backscatter diffraction) method, the low ΣCSL grain boundary ratio of sample C is 76.6%. As determined by the EBSD method, the low ΣCSL grain boundary ratio of the sample D not treated by the process of the present invention is 43.6%. Low ΣCSL grain boundaries are counted according to Palumbo-Aust standard. Samples C and D were kept at 650°C for 12 hours and then air-cooled as a sensitization treatment for intergranular corrosion experiments. After the sample surface is polished, the surface area is measured and weighed. After weighing, soak the sample in the corrosion solution, the composition (volume fr...

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Abstract

The invention relates to a grain boundary engineering process method for improving the corrosion resistance of stainless steel 316. The method comprises the steps of carrying out heat preservation on the stainless steel 316 for 5-60 minutes at the temperature of 1,050-1,150 DEG C, cooling with water, then, carrying out machining deformation of 3-15% deformation at room temperature, then, annealing in a manner of carrying out heat preservation for 3-120 minutes at the temperature of 1,020-1,150 DEG C, and finally, cooling with water, thereby obtaining the stainless steel 316 with relatively high corrosion resistance. According to the method, ingredients of materials are not required to be changed; and compared with the existing similar processes, long-time annealing is not required, repeated machining and annealing are also not required, the process is simpler, and the operation is easy, so that the method has very obvious economic benefits.

Description

technical field [0001] The invention relates to a grain boundary engineering (GBE, grain boundary engineering) process method for improving the corrosion resistance of 316 stainless steel, which belongs to the technical field of deformation and heat treatment process of metal materials. Background technique [0002] Due to its good comprehensive performance, 316 stainless steel has been widely used in petroleum, chemical, nuclear power and other industries. However, stress corrosion cracking (SCC, stress corrosion cracking) and intergranular corrosion (IGC, intergranular corrosion) have always been important failure forms in the service process of 316 stainless steel, and grain boundary sensitization is one of the main causes of these problems. When 316 stainless steel is heated between 500 and 800 °C, chromium-rich carbides will be precipitated on the grain boundaries, resulting in a chromium-poor area near the grain boundaries, which increases the corrosion sensitivity of ...

Claims

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Application Information

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IPC IPC(8): C21D6/00C21D8/00C21D1/26
Inventor 夏爽张子龙刘廷光杨辉赵清周邦新白琴
Owner SHANGHAI UNIV
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