High-plasticity economical duplex stainless steel and manufacturing method thereof

A technology of duplex stainless steel and its manufacturing method, which is applied in the field of high-plasticity economical duplex stainless steel and its manufacture, can solve problems not involving material plasticity, etc., achieve the effects of reducing adverse effects, excellent corrosion resistance, and reducing raw material costs

Inactive Publication Date: 2012-08-15
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] All of the above economical duplex stainless steel patents do not involve improving the plasticity of the material

Method used

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  • High-plasticity economical duplex stainless steel and manufacturing method thereof
  • High-plasticity economical duplex stainless steel and manufacturing method thereof
  • High-plasticity economical duplex stainless steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The metallographic structure of the alloy of embodiment 1 is as figure 1 shown. After the sample is ground and polished, electrolytic corrosion is performed, and the etchant is 40Gkoh+100mlH 2 O, corrosion current 0.3~0.8A / cm 2 , and finally analyzed the proportion of austenite by quantitative metallographic method under metallographic microscope. In the figure, the black structure is ferrite, the white structure is austenite, and the austenite phase accounts for about 48%.

Embodiment 2

[0059] The change of martensite content in the organization in the stretching process of embodiment 2 is as follows figure 2 shown. The tensile sample is manufactured according to the JIS-13B standard. After stretching to a predetermined amount of deformation on the MTS-810 stretching machine, it stops and unloads. Then, the magnetic change before and after stretching is measured by a magnetic instrument to confirm the stretching process. Whether martensite is produced in the medium and roughly confirm the amount of martensite. figure 2 It shows that in the process of tensile deformation, part of the austenite undergoes phase transformation to form deformed martensite, which is the key reason for the improvement of its plasticity.

[0060]It can be seen from Table 1 and Table 2 that the steel of the present invention uses 0.5-4.0% Mn and 0.1-0.18% N to replace Ni, compared with 304 austenitic stainless steel containing Ni up to 8% and Ni up to 10%. And 316 austenitic stain...

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Abstract

The invention relates to a high-plasticity economical duplex stainless steel and a manufacturing method thereof. The high-plasticity economical duplex stainless steel comprises the following chemical components by weight part: 0.01-0.06% of C, 0.1-1.0% of Si, 0.5-4.0% of Mn, 19.5-22.0% of Cr, 1.8-3.5% of Ni, 0.1-0.18% of N, 0.5-1.3% of Mo, 0.1-1.0% of Cu and the balance of Fe and inevitable impurities. According to the invention, Ni is replaced by Mn and N, so that the cost is lowered; the contents of Cr and Mo are adjusted, so that the steel has excellent corrosion resistance, higher plasticity, excellent low-temperature toughness, and excellent welding property; the Md 30/50 is controlled at 50-100 DEG C; and PREN value is 23-29. Thus, the high-plasticity economical duplex stainless steel can be widely applied to an environment with higher demand on corrosion resistance and plasticity, such as heat exchanger, water tank, and the like, so that the 304 austenitic stainless steel containing 8% of nickel and the 316 stainless steel containing of 10% Ni and 2% of Mo are replaced under the conditions of room temperature and low temperature.

Description

technical field [0001] The invention relates to a duplex stainless steel and a manufacturing method thereof, in particular to an economical duplex stainless steel with high plasticity and a manufacturing method thereof. Background technique [0002] Duplex stainless steel is composed of ferrite and austenite at room temperature, and the existence of the two-phase structure makes duplex stainless steel have the advantages of both ferritic stainless steel and austenitic stainless steel. Compared with austenitic stainless steel, the strength of duplex stainless steel, especially the yield strength, is significantly improved, which is about twice that of austenitic stainless steel; intergranular corrosion resistance, stress corrosion resistance, corrosion fatigue resistance and wear resistance are significantly improved. Compared with ferritic stainless steel, it has high toughness, low brittle transition temperature, intergranular corrosion resistance and significantly improved...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/44C22C38/54C21D8/02
Inventor 胡锦程张伟宋红梅王治宇江来珠
Owner BAOSHAN IRON & STEEL CO LTD
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