Two-phase stainless steel alloy and preparation method thereof

A duplex stainless steel and stainless steel technology, applied in the field of stainless steel metallurgy, can solve the problems of poor stability of the two-phase structure, poor thermal processing performance, poor thermal processing performance, and increased difficulty of thermal processing, etc., to achieve good thermal processing performance, good Corrosion resistance and the effect of overall performance improvement

Active Publication Date: 2013-05-01
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The patent application number is 200810032407.7: Compared with the patent 201110186769.3, this patent reduces the content of nickel, but the content of manganese does not increase accordingly, which makes it difficult to ensure the stability of the two-phase structure and increases the difficulty of thermal processing
[0010] The patent application number is 200810079771.9: this patent is the same as the patent 201110186769.3, which has the problems of poor stability of the two-phase structure and poor thermal processing performance
[0011] According to the above analysis, although there are many low-nickel duplex stainless steels, their cost has been greatly reduced compared with 304 and 3

Method used

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  • Two-phase stainless steel alloy and preparation method thereof
  • Two-phase stainless steel alloy and preparation method thereof
  • Two-phase stainless steel alloy and preparation method thereof

Examples

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Effect test

Embodiment 1

[0059] 1) The stainless steel mother liquor melted in an electric furnace at a temperature of 1400℃ is poured into the AOD furnace. The quality of the stainless steel mother liquor is divided into:

[0060] C: 1.2, Si: 0.20%, Mn: 0.10%, P: 0.040%, S: 0.035%, Cr: 18.0%, Ni: 2.50%, Cu: 0.7%, W: 1.0%, the rest are Fe and impurities;

[0061] 2) Top blow oxygen for decarburization, and blow nitrogen from the bottom of the AOD furnace to stir, add lime 100Kg / t steel and dolomite 25Kg / t steel, chromium content is 20%, and add 2000Kg high-carbon ferrochrome;

[0062] Determine the amount of oxygen blowing according to the carbon content in the molten steel during the steel in step 1). When the carbon mass percentage is 0.15, stop the top blowing oxygen. When the carbon mass percentage is 0.04%, measure the molten steel temperature and take a sample Analyze the carbon content and adjust the amount of oxygen blowing. When the carbon mass percentage is 0.03%, take another sample to analyze the...

Embodiment 2

[0075] 1) The stainless steel mother liquor melted by the electric furnace at a temperature of 1500℃ is poured into the AOD furnace. The quality of the stainless steel mother liquor is divided into:

[0076] C: 2.5%, Si: 0.10%, Mn: 0.05%, P: 0.020%, S: 0.02%, Cr: 22.0%, Ni: 1.50%, Cu: 1.0%, W: 0.05%, the rest is Fe and impurities ;

[0077] 2) Top blow oxygen for decarburization, and blow nitrogen from the bottom of the AOD furnace for stirring, add lime 150Kg / t steel and dolomite 40Kg / t steel, the mass percentage of chromium is 23.0%, add carbon steel 1000Kg after molten steel reduction Dilute

[0078] Determine the amount of oxygen blowing according to the carbon content in the molten steel during the steel in step 1). When the carbon mass percentage is 0.2%, stop the top blowing oxygen, and when the carbon mass percentage is 0.08%, measure the molten steel temperature, Take samples and analyze the carbon content, and adjust the amount of oxygen blowing. When the carbon mass perc...

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Abstract

The invention discloses a two-phase stainless steel alloy and a preparation method thereof. The two-phase stainless steel alloy is composed of the following chemical components in percentage by mass: 0.01-0.03 percent of C, 0.1-2.0 percent of Si, 1.0-3.0 percent of Mn, 20-22 percent of Cr, 1.7-2.5 percent of Ni, 0.7-1.0 percent of Cu, 0.1-0.2 percent of N, 0.2-1.0 percent of W, as well as Fe and unavoidable impurity elements in balancing amount. According to the invention, the two-phase stainless steel has good performance of mechanics, hot working performance and high corrosion resistance, and can be manufactured by the prior art. The adopted low-cost N and Mn substitute Ni to stabilize the Austenite phase of the two-phase stainless steel, and the low-cost W substitutes Mo, so that the cost is lowered; and meanwhile, the lower content of the element M is controlled via reasonably regulating the mixture ratio of the elements Ni, N and Mn, a situation that low-melting-point sulphides exist at a phase boundary is avoided, and the hot working performance of the two-phase stainless steel is effectively ameliorated.

Description

Technical field [0001] The invention relates to a duplex stainless steel alloy and a preparation method thereof, and belongs to the field of stainless steel metallurgy. Background technique [0002] Duplex stainless steel refers to a stainless steel whose solid solution structure is composed of two phases of ferrite and austenite, and one of the phase ratios is about 45%-55% (the less phase accounts for at least 30%). Due to the characteristics of the two-phase structure, the duplex stainless steel has the advantages of both ferritic stainless steel and austenitic stainless steel. Compared with ferritic stainless steel, it has high toughness, low brittle transition temperature, resistance to intergranular corrosion and good welding performance. It retains the advantages of high thermal conductivity and small expansion coefficient of ferritic steel. Compared with austenitic stainless steel, its yield strength is about twice that of austenitic stainless steel, and its resistance t...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/44C22C38/54
Inventor 严密刘彦妍王新华颜海涛申鹏
Owner ZHEJIANG UNIV
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