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Economic biphase stainless steel with high mechanical property and superior corrosion resistance

A duplex stainless steel and corrosion-resistant technology, which is applied in the field of typical austenitic stainless steel 304 and 316L alternative materials, can solve the problems of difficult realization, low strength performance, and fluctuation of alloy cost and price, and achieve low carbon content and stable price fluctuation. Sensitive, more economical and stable results

Inactive Publication Date: 2011-04-06
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Austenitic stainless steel is currently the most widely used, accounting for more than 60% of the total amount of stainless steel. It is characterized by good corrosion resistance and easy processing and manufacturing, but its disadvantages are low strength and performance, and it is affected by the fluctuation of alloy cost and price. larger
Although ferritic stainless steel is used more and more in thin-gauge applications, due to its own grain coarsening tendency (especially in the heat-affected zone of the weld), it is necessary to replace austenitic stainless steel in specifications above 3mm Difficult to achieve

Method used

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  • Economic biphase stainless steel with high mechanical property and superior corrosion resistance
  • Economic biphase stainless steel with high mechanical property and superior corrosion resistance
  • Economic biphase stainless steel with high mechanical property and superior corrosion resistance

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Embodiment

[0019] 1. Implement the composition and process of steel

[0020] Proportioning is carried out according to the composition range of the economical duplex stainless steel of the present invention, and the vacuum induction furnace method is used for smelting to obtain the chemical composition (weight percentage) of the steel shown in Table 1. Casting was carried out according to the conditions in Table 1. After casting, water spray cooling was carried out in the temperature range from 1000°C to 500°C. There was no σ phase precipitation in the microstructure, and no cracks appeared on the slab surface, and high-quality cast slabs could be obtained.

[0021] Chemical composition and pouring temperature (weight percent, %) of table 1 invention stainless steel

[0022]

[0023] The slab was subjected to soaking treatment at 1250°C for 3 hours, and hot-rolled into hot-rolled sheets with a thickness of 6mm, 10mm and 16mm through multiple passes. The final rolling temperature was c...

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Abstract

The invention provides an economic biphase stainless steel with high mechanical property and superior corrosion resistance, which comprises the following components in percentage by weight: less than or equal to 0.03% of C, 21.5-23.0% of Cr, 1.50-2.50% of Ni, 0.20-0.40% of N, 0.20-0.40% of Mo, 0.20-0.50% of Cu, 0.5-2.0% of Mn, less than 0.005% of S, less than 0.005% of P, and the balance Fe and unavoidable impurities. After the steel product is thermally treated at the temperature range of 980-1080 DEG C, the contents of ferrite and austenite in the obtained biphase structure are approximately same, the local corrosion resistant capacity and the uniform corrosion resistant capacity are superior to those of 304 austenitic stainless steel, the mechanical property is similar to that of 316L austenitic stainless steel, and the steel product can be used as an alternate material for the currently extensively used 304 austenitic stainless steel and 316L austenitic stainless steel.

Description

technical field [0001] The invention relates to an economical duplex stainless steel with high mechanical properties and excellent corrosion resistance, which can be used as a substitute material for typical austenitic stainless steel 304 and 316L used in structural applications, drinking water systems, pulp and paper industries. Background technique [0002] Austenitic stainless steel is currently the most widely used, accounting for more than 60% of the total amount of stainless steel. It is characterized by good corrosion resistance and easy processing and manufacturing, but its disadvantages are low strength and performance, and it is affected by the fluctuation of alloy cost and price. larger. Although ferritic stainless steel is used more and more in thin-gauge applications, due to its own grain coarsening tendency (especially in the heat-affected zone of the weld), it is necessary to replace austenitic stainless steel in specifications above 3mm Difficult to achieve....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/44
Inventor 邹德宁王铎韩英陈治毓乔圆圆张威
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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