High-silicon high-aluminium ferrite stainless steel and its application in preparation of heat-resisting steel pipe

A high-alumina iron and stainless steel technology, applied to high-silicon, high-alumina ferritic stainless steel and its application in the preparation of heat-resistant steel pipes, ferritic stainless steel and its application in rolling heat-resistant steel pipes, can Solve the problems of surface peeling, poor stress corrosion resistance, difficult to process seamless steel pipes, etc.

Inactive Publication Date: 2004-11-03
王光煌
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Problems solved by technology

[0002] At present, in the petroleum, chemical industry, especially in various furnace industries where there are a large amount of chloride ions and sulfides, tubular heat exchangers are used at high temperatures, generally 18-8 austenitic stainless steel, The stress corrosion resistance of this type of steel is very poor, and the high temperature oxidation resistance is not good, and the surface falls off in a large area at high temperature and cannot be used.
The use of Cr18 ty

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  • High-silicon high-aluminium ferrite stainless steel and its application in preparation of heat-resisting steel pipe
  • High-silicon high-aluminium ferrite stainless steel and its application in preparation of heat-resisting steel pipe

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Embodiment Construction

[0030] The invention is a ferritic stainless steel containing high silicon and high aluminum, which is processed into a seamless steel pipe by a temperature control method. High silicon and high aluminum elements are added to Cr18 ferritic stainless steel to improve the high temperature oxidation resistance of the steel, and it has good corrosion resistance in the environment of chloride ions, sulfur and hydrogen sulfide. The trace element titanium (niobium) is added to refine the grains of the steel. Due to the content of silicon and aluminum in the steel, it brings great difficulties to the tube-making process. In order to solve this problem, temperature-controlled processing without The method of sewing steel pipes. Compared with 18-8 type austenitic stainless steel pipe, this material has excellent resistance to stress corrosion cracking. At high temperature, it not only has superior oxidation resistance, but also has superior resistance to sulfur and hydrogen sulfide envi...

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Abstract

The present invention relates to ferrite stainless steel and its application in rolling heat resistant steel pipe. The ferrite stainless steel contains: C not more than 0.06 wt%, Cu not more than 0.30 wt%, Si 0.5-2.0 wt%, S not more than 0.030 wt%, Mn not more than 0.6 wt%, P not more than 0.030 wt%, Cr 16.0-25.0 wt%, Ti not more than 0.3wt%, Al 0.5-2.0 wt%, Ni not more than 0.60 wt%, N not more than 0.030 wt%, except Fe. During making heat resistant steel pipe with the ferrite stainless steel, temperature control mode in 100-1050 deg.c is adopted.

Description

Technical field [0001] The invention belongs to the field of ferritic stainless steel and its application in rolling heat-resistant steel pipes, and in particular relates to a high-silicon, high-aluminum ferritic stainless steel and its application field in preparing heat-resistant steel pipes. Background technique [0002] At present, in the petroleum, chemical industry, especially in various furnace industries where there are a large amount of chloride ions and sulfides, tubular heat exchangers are used at high temperatures, generally 18-8 austenitic stainless steel, The stress corrosion resistance of this type of steel is very poor, and the high temperature oxidation resistance is not good, and the surface falls off in a large area at high temperature and cannot be used. The use of Cr18 type ferritic stainless steel as a heat exchanger solves the problem of using in environments containing chloride ions and hydrogen sulfide, but it has poor oxidation resistance at high te...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/34
Inventor 王光煌
Owner 王光煌
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