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Low-Ni sulphur corrosion resistance stainless steel and preparation method thereof

A manufacturing method and stainless steel technology, applied in the field of corrosion-resistant stainless steel and its manufacturing, can solve the problems of secondary increase in user cost, short service life, high cost of chromium-nickel alloy, etc., and achieve the effect of cost reduction and good corrosion resistance

Inactive Publication Date: 2016-09-28
杜晓东 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the domestic stainless steel materials serving in the working environment of sulfidation corrosion use chrome-nickel alloy steel 304, etc., and foreign materials are basically extended on the basis of 304. There has been no major breakthrough in the product's sulfide corrosion resistance. Nickel alloy has high cost and short service life, and frequent replacement results in secondary increase of user's cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]The alloy composition by weight percentage is: 0.01%C, 14.0%Cr, 3.5%Ni, 1.6%Mn, 0.01%RE, ≤0.035%P, ≤0.035%S, and the balance is Fe and impurities. The melting temperature is 1580°C, and the casting temperature is 1480-1520°C. Al is added as a deoxidizer during smelting (the amount added is 0.2% by weight). Funnel-type crystallizer is used, casting speed: 4-5m / min, upper dummy rod speed: 4m / min, crystallizer amplitude: ±5mm, vibration frequency: 250 times / min. Heating exit temperature before rolling is 1140±10°C, final rolling temperature: 890±25°C, rolling mill reduction rate: 40%~50%. Air cooling is used after rolling to obtain the final profile.

Embodiment 2

[0044] The alloy composition by weight percentage is: 0.01%C, 14.0%Cr, 2.6%Ni, 0.5%Si, 1.6%Mn, 0.01%RE, ≤0.035%P, ≤0.035%S, and the balance is Fe and impurities. The melting temperature is 1580°C, and the casting temperature is 1480-1520°C. Al is added as a deoxidizer during smelting (the amount added is 0.2% by weight). Funnel-type crystallizer is used, casting speed: 4-5m / min, upper dummy rod speed: 4m / min, crystallizer amplitude: ±5mm, vibration frequency: 250 times / min. Heating exit temperature before rolling is 1140±10°C, final rolling temperature: 890±25°C, rolling mill reduction rate: 40%~50%. Air cooling is used after rolling to obtain the final profile.

Embodiment 3

[0046] The alloy composition by weight percentage is: 0.05%C, 16.0%Cr, 2.6%Ni, 0.5%Si, 1.6%Mn, 0.2%RE, ≤0.035%P, ≤0.035%S, and the balance is Fe and impurities. The melting temperature is 1580°C, and the casting temperature is 1480-1520°C. Al is added as a deoxidizer during smelting (the amount added is 0.2% by weight). Funnel-type crystallizer is used, casting speed: 4-5m / min, upper dummy rod speed: 4m / min, crystallizer amplitude: ±5mm, vibration frequency: 250 times / min. Heating exit temperature before rolling is 1140±10°C, final rolling temperature: 890±25°C, rolling mill reduction rate: 40%~50%. Air cooling is used after rolling to obtain the final profile.

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Abstract

Low-Ni sulphur corrosion resistance stainless steel comprises, by weight percentage, 0.01-0.10% of C, 14.00-16.00% of Cr, 0-1.00% of Si, 1.60-3.50% of Mn, 2.60-3.50% of Ni, 0.01-0.40% of RE (rare earth), 0-0.045% of P, 0-0.045% of S, 0-2% of other metal and non-metal element impurities except Fe, and the balance Fe. Through alloy matching and a matched preparation method, the prepared sulphur corrosion resistance stainless steel has good high-temperature resistance performance and corrosion resistance under the sulphur corrosion working environment, the service life of the sulphur corrosion resistance stainless steel is twice that of 316 stainless steel, and the cost of the sulphur corrosion resistance stainless steel is 20% lower than that of the 316 stainless steel.

Description

technical field [0001] The present invention relates to anti-corrosion stainless steel and its manufacture method, more specifically, design a kind of low-Ni sulfide corrosion anti-corrosion stainless steel and its manufacture method which are applied in the working environment of sulfide corrosion. Background technique [0002] Stainless steel pipes and other devices serving in a sulfide-corrosion working environment will withstand the action of high-temperature gas and liquid at a maximum of 500-600 ° C and the erosion of corrosive gases such as hydrogen sulfide contained in them. The requirements for materials are very high. Performance, but also anti-sulfidation corrosion performance. Most of the domestic stainless steel materials used in the working environment of sulfidation corrosion use chrome-nickel alloy steel 304, etc., and foreign materials are basically extended on the basis of 304. There has been no major breakthrough in the product's sulfide corrosion resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/60C21D1/18C21D6/00C21D1/26
CPCC22C38/58C21D1/18C21D1/26C21D6/004C21D2211/001C22C38/005C22C38/02C22C38/60
Inventor 杜晓东梁剑费积强张真闫键张勇罗来马
Owner 杜晓东
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