Corrosion-resistant high-strength 316L stainless steel and preparation method thereof

A stainless steel and high-strength technology, which is applied in the field of stainless steel structure and preparation, can solve the problems of low strength of austenitic stainless steel, restrictions on structural parts, and reduced corrosion resistance, and achieve the effects of improving strength, reducing impact, and eliminating residual stress

Active Publication Date: 2019-07-30
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The strength of austenitic stainless steel is generally low, and the traditional process of preparing high-strength 316L stainless steel will lead to a decrease in corrosion resistance, which is limited in the use of structural parts

Method used

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  • Corrosion-resistant high-strength 316L stainless steel and preparation method thereof
  • Corrosion-resistant high-strength 316L stainless steel and preparation method thereof
  • Corrosion-resistant high-strength 316L stainless steel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] Heat 316L stainless steel to 1100°C in a vacuum tube furnace, take it out after 1 hour of heat preservation, and then quickly place it in a 5% NaCl solution to cool to room temperature, and then carry out rolling treatment with a deformation of 40% in a liquid nitrogen environment. Soak for 48 hours for cryogenic treatment, and finally vacuum aging for 4 hours at 500°C. Characterized by X-ray diffraction technology and transmission electron microscope, the phase composition of the prepared 316L stainless steel alloy is mainly composed of nano-twins, and it is a composite material composed of certain components of nano-crystals and micro-crystals. The average grain size is 200nm, the average grain size of the nanocrystal is 80nm, and the volume percentage of the nanocrystal is 50%. Nano-twins and micro-crystals are distributed on the nano-crystal matrix, the average size of the nano-twins is 100nm, and the volume percentage is 15%; the average grain size of the microns i...

Embodiment 2

[0036] Heat 316L stainless steel to 1100°C in a vacuum tube furnace, take it out after 1 hour of heat preservation, and then quickly place it in a 5% NaCl solution to cool to room temperature, and then carry out rolling treatment with 60% deformation in a liquid nitrogen environment. Soak for 24 hours for cryogenic treatment, and finally vacuum aging at 500°C for 2 hours. Characterized by X-ray diffraction technology and transmission electron microscope, the phase composition of the prepared 316L stainless steel alloy is mainly composed of nano-twins, which is a composite material composed of a certain composition of nano-crystals and micro-crystals. The average grain size is 190nm, the average grain size of the nanocrystal is 70nm, and the volume percentage of the nanocrystal is 60%. Nano-twins and micro-crystals are distributed on the nano-crystal matrix, the average size of nano-twins is 90nm, and the volume percentage is 15%; the average grain size of microns is 70 μm, and...

Embodiment 3

[0038] After solution treatment of 316L stainless steel under vacuum, it was quickly placed in 5% NaCl solution and cooled to room temperature, followed by rolling treatment with 80% deformation in liquid nitrogen environment, submerged in liquid nitrogen equipment for 12 hours for cryogenic treatment, and finally Vacuum aging at 500°C for 1h. Characterized by X-ray diffraction technology and transmission electron microscope, the phase composition of the prepared 316L stainless steel alloy is mainly composed of nano-twins, which is a composite material composed of certain components of nano-crystals and micro-crystals. The average grain size is 180nm, the average grain size of the nanocrystal is 60nm, and the volume percentage of the nanocrystal is 70%. Nano-twins and micro-crystals are distributed on the nano-crystal matrix, the average size of nano-twins is 80nm, and the volume percentage is 20%; the average grain size of microns is 70 μm, and the volume percentage is 10%. ...

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Abstract

The invention relates to a stainless steel structure and a preparation method thereof, and in particular relates to a corrosion-resistant high-strength 316L stainless steel and a preparation method thereof. The corrosion-resistant high-strength 316L stainless steel comprises solid solution treatment, low-temperature rolling deformation, cryogenic treatment and aging treatment, the novel microstructure is prepared by the method, the nano twin crystal, nanocrystalline and superfine crystal composite structure is prepared, the average grain size is less than or equal to 200 nm, the hardness is 450 -500 HV, and the tensile strength reaches 1200 -1400 Mpa. The corrosion potential E0 of 316L stainless steel prepared by the method is lager than -0. 4V, good corrosion resistance is still kept whenthe 316L stainless steel pitting potential e0 is soaked in 5% nacl solution for 60 days, the novel structure 316L stainless steel has excellent mechanical properties and relatively good corrosion resistance, and can be widely applied to complex application environments such as pressure vessels, ship engineering, nuclear power equipment and the like.

Description

technical field [0001] The invention relates to a stainless steel structure and a preparation method, in particular to a corrosion-resistant high-strength 316L stainless steel and a preparation method. Background technique [0002] Austenitic stainless steel is the most important steel in stainless steel. Its output and consumption account for about 70% of the total output and consumption of stainless steel. It has the characteristics of good gloss, excellent ductility and strong corrosion resistance. At present, the dominant steel grade in stainless steel is still nickel-chromium austenitic stainless steel represented by 316L. Due to its excellent performance, 316L stainless steel is often used as a structural material in the design of nuclear power equipment, and 316L stainless steel is also widely used in small reactor pressure vessels and ship engineering. [0003] The strength of austenitic stainless steel is generally low, and the traditional process of preparing high...

Claims

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Application Information

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IPC IPC(8): C21D6/00C21D6/04C21D8/00
CPCC21D6/004C21D6/04C21D8/005
Inventor 魏伟李嘉兴魏坤霞杜庆柏胡静
Owner CHANGZHOU UNIV
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