Preparation method of heterogeneous-layered-structure 304L stainless steel

A technology of 304 stainless steel and stainless steel, which is applied in the field of preparation of 304L stainless steel with heterogeneous layered structure, can solve the problems of low strength and low plasticity, and achieve the effect of simple conditions and easy operation.

Inactive Publication Date: 2019-05-28
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing 304L stainless steel with a heterogeneous layered structure to solve the problem of low strength of 304L stainless steel in the coarse crystal state and low plasticity of 304L stainless steel in the nanocrystalline state. Heterogeneous layered structure 316L austenitic stainless steel with a tensile strength of 700-1000MPa and a uniform elongation ≥ 20%

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  • Preparation method of heterogeneous-layered-structure 304L stainless steel
  • Preparation method of heterogeneous-layered-structure 304L stainless steel
  • Preparation method of heterogeneous-layered-structure 304L stainless steel

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Experimental program
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Effect test

Embodiment 1

[0022] First of all, the present embodiment adopts the following equipment: Hot-rolling and cold-rolling multi-purpose rolling mills, box-type resistance furnaces for heat treatment.

[0023] The specific operation of preparing a heterogeneous layered structure 304L stainless steel in this embodiment is as follows:

[0024] The thickness of the 304L stainless steel plate used in this embodiment is 14mm, and its composition (wt.%) is as follows: C is 0.02, Si is 0.36, Mn is 1.23, P is 0.026, S is 0.005, Ni is 8.1, and Cr is 18.21 , and the rest are Fe and unavoidable impurities.

[0025] Put the above-mentioned 304L stainless steel plate into a box-type resistance furnace with a temperature of 1100°C for 30 minutes, take it out and cool it to room temperature. After solution treatment, the grain size of the coarse-crystalline stainless steel is relatively uniform, and the average grain size is about 60 μm.

[0026] The solution-treated stainless steel plate was cold-rolled a...

Embodiment 2

[0030] First of all, the present embodiment adopts the following equipment: Hot-rolling and cold-rolling multi-purpose rolling mills, box-type resistance furnaces for heat treatment.

[0031] The specific operation of preparing a heterogeneous layered structure 304L stainless steel in this embodiment is as follows:

[0032] The thickness of the 304L stainless steel plate used in this embodiment is 14mm, and its composition (wt.%) is as follows: C is 0.02, Si is 0.36, Mn is 1.23, P is 0.026, S is 0.005, Ni is 8.1, and Cr is 18.21 , and the rest are Fe and unavoidable impurities.

[0033] Put the above-mentioned 304L stainless steel plate into a box-type resistance furnace with a temperature of 1100°C for 30 minutes, take it out and cool it to room temperature. After solution treatment, the grain size of the coarse-crystalline stainless steel is relatively uniform, and the average grain size is about 60 μm.

[0034] The solution-treated stainless steel plate was cold-rolled a...

Embodiment 3

[0038] First of all, the present embodiment adopts the following equipment: Hot-rolling and cold-rolling multi-purpose rolling mills, box-type resistance furnaces for heat treatment.

[0039] The specific operation of preparing a heterogeneous layered structure 304L stainless steel in this embodiment is as follows:

[0040] The thickness of the 304L stainless steel plate used in this embodiment is 14mm, and its composition (wt.%) is as follows: C is 0.02, Si is 0.36, Mn is 1.23, P is 0.026, S is 0.005, Ni is 8.1, and Cr is 18.21 , and the rest are Fe and unavoidable impurities.

[0041] Put the above-mentioned 304L stainless steel plate into a box-type resistance furnace with a temperature of 1100°C for 30 minutes, take it out and cool it to room temperature. After solution treatment, the grain size of the coarse-crystalline stainless steel is relatively uniform, and the average grain size is about 60 μm.

[0042] The solution-treated stainless steel plate was cold-rolled a...

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Abstract

The invention discloses a preparation method of a heterogeneous-layered-structure 304L stainless steel, and belongs to the field of stainless steel preparation. According to the method, firstly, solidsolution treatment is carried out on the 304L stainless steel with the thickness being 3-30 mm to obtain uniform austenite structures with the average grain size being 40-120 microns; then, cold rolling treatment is carried out on the 304L stainless steel with the total rolling reduction being 60-90% to form traditional strip-shaped cold-rolled structures; and finally, incomplete recrystallization annealing treatment is carried out on the 304L stainless steel for 5-60 minutes at the condition being 650-750 DEG C, and thus the heterogeneous-layered-structure 304L stainless steel is prepared. The mechanical experiment result shows that the stainless steel has the yield strength being 450-1000 MPa and the tensile strength being 750-1000 MPa, and it is worth noting that the uniform elongationrate of the 304L stainless steel can reach greater than or equal to 20%. The method is easy to operate and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of stainless steel preparation, and in particular relates to a method for preparing 304L stainless steel with a heterogeneous layered structure. Background technique [0002] 304L austenitic stainless steel has good comprehensive performance, especially its excellent anti-oxidation and corrosion resistance, which makes it widely used in petroleum, chemical, construction, food, medical and other industries. Although the traditional industrial 304L stainless steel has good plasticity and toughness, its yield strength is only about 300±50MPa, which severely limits its use. [0003] In the past 20 years, the manufacturing technology of ultrafine crystals and even nanocrystals obtained through severe plastic deformation can greatly improve the strength of materials. Such as: large deformation rolling, equal channel extrusion, surface grinding, surface rolling, shot peening, etc. Simple rolling with a large amount of defo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/40C22C38/58C21D6/00C21D8/02C22C38/02C22C38/04
Inventor 李玉胜方超李建生高波
Owner NANJING UNIV OF SCI & TECH
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