Duplex stainless steel and preparation method thereof

A duplex stainless steel and preparation technology, which is applied in the field of stainless steel production and processing, can solve the problems of low elongation, poor elongation, insufficient elongation and toughness, etc., to increase the content, increase the tensile strength and elongation, and reduce production costs Effect

Inactive Publication Date: 2017-08-22
合肥协耀玻璃制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the martensite in this type of stainless steel is unannealed martensite, its elongation is poor, and the elongation rate is less than 30%, generally around 20%; its low-temperature impact toughness is no

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  • Duplex stainless steel and preparation method thereof

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Experimental program
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Effect test

Embodiment １

[0034] A duplex stainless steel whose chemical composition by weight percentage is: C: 0.01%, Si: 0.08%, Ni: 4.6%, Mn: 1.0%, Cr: 22.5%, N: 0.04%, Ca: 0.02% , Mg: 0.006%, Ti: 0.004%, Co: 0.007%, Y: 0.001%, the balance is Fe and unavoidable impurities, and the weight percentage of the impurities is ≤0.1%.

[0035] The preparation process of this kind of duplex stainless steel is carried out according to the following steps:

[0036] 1) Prepare the raw materials according to the composition and weight percentage content, and perform high-temperature vacuum dehydration and degassing treatment on the above-mentioned raw materials;

[0037] 2) Add the pure iron in the raw material into the electric arc smelting furnace for melting, the melting temperature is 1100°C, and the melting time is 30 minutes, then add Si, Ni, Cr, N, Ca, Mg in an orderly manner, and fill the furnace with argon As a protective gas, the pressure is controlled at 0.03MPa, and the temperature in the furnace is ...

Embodiment 2

[0041] A duplex stainless steel whose chemical composition by weight percentage is: C: 0.02%, Si: 0.1%, Ni: 6.3%, Mn: 2.0%, Cr: 24.1%, N: 0.05%, Ca: 0.03% , Mg: 0.008%, Ti: 0.006%, Co: 0.009%, Y: 0.002%, the balance is Fe and unavoidable impurities, and the weight percentage of the impurities is ≤0.1%.

[0042] The preparation process of this kind of duplex stainless steel is carried out according to the following steps:

[0043] 1) Prepare the raw materials according to the composition and weight percentage content, and perform high-temperature vacuum dehydration and degassing treatment on the above-mentioned raw materials;

[0044] 2) Put the pure iron in the raw material into the electric arc smelting furnace for melting, the melting temperature is 1200°C, and the melting time is 25 minutes, then add Si, Ni, Cr, N, Ca, Mg in an orderly manner, and fill the furnace with argon As a protective gas, the pressure is controlled at 0.04MPa, and the temperature in the furnace is s...

Embodiment 3

[0048] A duplex stainless steel whose chemical composition by weight percentage is: C: 0.03%, Si: 0.12%, Ni: 7.1%, Mn: 2.8%, Cr: 25.0%, N: 0.06%, Ca: 0.04% , Mg: 0.010%, Ti: 0.008%, Co: 0.01%, Y: 0.003%, the balance is Fe and unavoidable impurities, and the weight percentage of the impurities is ≤0.1%.

[0049] The preparation process of this kind of duplex stainless steel is carried out according to the following steps:

[0050] 1) Prepare the raw materials according to the composition and weight percentage content, and perform high-temperature vacuum dehydration and degassing treatment on the above-mentioned raw materials;

[0051] 2) Put the pure iron in the raw material into the electric arc smelting furnace for melting, the melting temperature is 1300°C, and the melting time is 20 minutes, then add Si, Ni, Cr, N, Ca, Mg in an orderly manner, and fill the furnace with argon As a protective gas, the pressure is controlled at 0.05MPa, and the temperature in the furnace is s...

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Abstract

The invention discloses a duplex stainless steel and a preparation method thereof. The duplex stainless steel comprises the following components: C, Si, Ni, Mn, Cr, N, Ca, Mg, Ti, Co, Y, and the balance is Fe and not Impurities to be avoided, and the weight percentage of the impurities is ≤0.1%. Its preparation process is to first dehydrate and degas the above raw materials and smelt pure iron, then add other raw materials in an orderly manner, fill the furnace with argon as a protective gas, control the pressure and temperature, and then add the remaining C, Ti, Co, Y, Mn, and then transport the mixed mother liquor to the AOD furnace for oxygen decarburization, nitrogen blowing and composition adjustment, and finally through vacuum casting, rolling, solution treatment and quenching treatment in turn. Compared with the prior art, the duplex stainless steel of the present invention not only has good corrosion resistance, but also has greatly improved tensile strength and elongation performance.

Description

technical field [0001] The invention relates to the field of stainless steel production and processing, in particular to a duplex stainless steel and a preparation method thereof. Background technique [0002] Duplex Stainless Steel (DSS for short) refers to stainless steel with ferrite and austenite each accounting for about 50%, and the content of less phases generally needs to reach at least 30%. In the case of low C content, the Cr content is 18%-28%, and the Ni content is 3%-10%. Some steels also contain alloying elements such as Mo, Cu, Nb, Ti, and N. [0003] The following is the effect of each element in alloy steel: [0004] Carbon (C) is an austenite-forming element, which replaces nickel to a certain extent, promotes austenite and stabilizes austenite. When the carbon content is too high, it will form chromium carbide with chromium, and the corrosion resistance and toughness of stainless steel will deteriorate. In order to ensure the corrosion resistance of sta...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50C22C38/52C22C38/02C22C38/04C22C33/04
CPCC22C38/58C22C33/04C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/50C22C38/52
Inventor 魏芳芳
Owner 合肥协耀玻璃制品有限公司
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