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Manufacturing process of corrosion-resistant flange for petrochemical equipment

A manufacturing process and corrosion-resistant technology, applied in the coating process of metal materials, devices for coating liquid on the surface, coatings, etc., can solve the problems of material embrittlement risk, intermetallic phase precipitation, etc., to improve wear resistance the effect of reducing the ductile-brittle transition temperature and stabilizing the austenite phase

Inactive Publication Date: 2018-11-06
JIANGYIN HENGRUN HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 of corrosion-resistant flanges for petrochemical 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 heating, then cut off the riser a...

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Abstract

The invention provides a manufacturing process of a corrosion-resistant flange for petrochemical equipment. The manufacturing process comprises the following steps of: obtaining a raw material steel ingot, wherein the raw material steel ingot comprises the following chemical components of, by weight, 0.10% to 0.20% of C, 12.0% to 16.0% of Cr, 2.12% to 2.15% of Ni, 21.0% to 25.0% of Mn, 0.50% to 1.00% of Cu, 0.10% to 0.20% of N, 1.00% to 2.00% of Si, 1.00% to 2.00% of Al, 0.06% to 0.08% of V, smaller than or equal to 0.035% of P, smaller than or equal to 0.02% of S, 0.03% to 0.10% of Re and thebalances Fe and non-removable impurities; forming a corrosion-resistant metal coating on the surface of the flange in a plasma coating manner; coating the surface of the corrosion-resistant metal coating with a polyurethane finish paint layer; and coating the surface of the polyurethane finish paint with a nanometer solution layer.

Description

technical field [0001] The invention relates to a manufacturing process of a corrosion-resistant flange for petrochemical equipment. Background technique [0002] Flanges used in petrochemical equipment need to have strong corrosion resistance, and the early former Soviet Union studied the two-phase ratio of α (ferrite phase) and γ (austenite phase) has an important impact on the process plasticity at high temperature : 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, which leads to 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 plasticity during hot forging, it is necessary to ensure that the number of austenite phases in the structure do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/34C22C38/42C22C38/44C22C38/46C22C38/50C22C38/52C22C38/58C23C4/06C23C4/134B05D7/24
CPCB05D7/24C22C38/002C22C38/005C22C38/06C22C38/34C22C38/42C22C38/44C22C38/46C22C38/50C22C38/52C22C38/58C23C4/06C23C4/134
Inventor 张伟沈忠协孙天宇吕澎沸范红富缪一晨吴斌
Owner JIANGYIN HENGRUN HEAVY IND
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