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Manufacturing process of high-performance duplex stainless steel flange for seawater desalination equipment

A technology of duplex stainless steel and manufacturing process, which is applied in the direction of metal material coating process, coating, molten spraying, etc., can solve the problems of intermetallic phase precipitation and material embrittlement risk, so as to reduce the ductile-brittle transition temperature and improve Abrasion resistance and the effect of reducing production cost

Inactive Publication Date: 2018-09-07
JIANGYIN HENGRUN HEAVY IND
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AI Technical Summary

Problems solved by technology

The final forging temperature should not be too low. If it is lower than 950°C, there will be harmful σ-equal intermetallic phases that are easy to precipitate between the grains, which will bring the risk of embrittlement to the material.

Method used

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Examples

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Embodiment Construction

[0020] The specific implementation of the present invention will be further described below in conjunction with the examples. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0021] A manufacturing process for high-performance duplex stainless steel flanges for seawater desalination equipment, comprising the following steps:

[0022] Include the following steps:

[0023] S1. Obtain raw material steel ingot, its chemical composition and weight percentage are: C: 0.10%-0.20%, Cr: 12.0%-16.0%, Ni: 2.12-2.15%, Mn: 21.0%-25.0%, Cu : 0.50% - 1.00%, N: 0.10% - 0.20%, Si: 1.00% -2.00%, A1: 1.00-2.00%, V: 0.06-0.08%, P ≤ 0.035%, S ≤ 0.02% , Re: 0.03% -0.10%, the balance is Fe and non-removable impurities, and inspection is carried out to ensure that it is within the standard range;

[0024] S2. Send the obtained steel ingot to the heating furnace for heat...

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Abstract

The invention provides a manufacturing process of a high-performance duplex stainless steel flange for seawater desalination equipment. The manufacturing process comprises the following steps that a raw material steel ingot is obtained, wherein the chemical components of the steel ingot comprise, by weight, 0.10%-0.20% of C, 12.0%-16.0% of Cr, 2.12%-2.15% of Ni, 21.0%-25.0% of Mn, 0.50%-1.00% of Cu, 0.10%-0.20% of N, 1.00%-2.00% of Si, 1.00%-2.00% of Al, 0.06%-0.08% of V, less than or equal to 0.035% of P, less than or equal to 0.02% of S, 0.03%-0.10% of Re, and the balance Fe and non-removable impurities; a corrosion-resistant metal coating is formed on the surface of the flange in a plasma spraying mode; and a layer of polyurethane finish paint is applied on the surface of the corrosion-resistant metal coating, and a layer of nano-solution is applied on the surface of the polyurethane finish paint.

Description

technical field [0001] The invention relates to a manufacturing process for a high-performance duplex stainless steel flange used in seawater desalination equipment. Background technique [0002] Due to the corrosiveness of seawater, the flanges used for offshore equipment need to have strong corrosion resistance. In the early days of the former Soviet Union, the two-phase ratio of α (ferrite phase) and γ (austenite phase) was studied on the process at high temperature. The influence of plasticity has an important influence: ferrite has a body-centered cubic structure, and austenite has a face-centered cubic structure. The deformation mechanisms of the two phases are different at high temperatures, resulting in poor thermoplasticity of duplex stainless steel. Studies have shown that when the amount of α-phase or γ-phase exceeds 20-25%, the plasticity of steel decreases, and crack defects are prone to occur during hot forging. Therefore, in order to ensure sufficient plastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/42C22C38/34C22C38/02C22C38/06C22C38/46C21D8/00C23C4/134
CPCC21D8/005C22C38/001C22C38/002C22C38/02C22C38/06C22C38/34C22C38/42C22C38/46C22C38/58C23C4/134
Inventor 唐广林承天洋张伟卢迅钱志刚邵会顾明浩
Owner JIANGYIN HENGRUN HEAVY IND
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