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Separation method of two-phase structure in duplex stainless steel, reticular ferrite microporous material

A technology of duplex stainless steel and separation method, which is applied in the field of stainless steel, can solve problems such as the inability to obtain a single organizational structure, and achieve the effect of wide application range and simple method

Active Publication Date: 2020-08-14
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a method for separating the two-phase structure in duplex stainless steel and a reticular ferrite microporous material to solve the problem that a single structure cannot be obtained from duplex stainless steel in the prior art

Method used

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  • Separation method of two-phase structure in duplex stainless steel, reticular ferrite microporous material
  • Separation method of two-phase structure in duplex stainless steel, reticular ferrite microporous material
  • Separation method of two-phase structure in duplex stainless steel, reticular ferrite microporous material

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Experimental program
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Effect test

Embodiment 1

[0064] 2507 duplex stainless steel was used for testing. The chemical composition weight percent of the steel is as follows: C 0.020, Mn0.75, P 0.026, S 0.002, Si 0.21, Ni 6.82, Cr 25.04, Mo 3.56, N 0.26, and the rest are Fe and unavoidable impurity elements. The structure of the 2507 plate obtained by hot rolling and solution heat treatment at 1050°C for 1h, such as image 3 As shown, the proportion of ferrite α phase is about 42% (volume percentage):

[0065] Prepare a mixed solution of 2.0M copper sulfate (volume molar concentration) + 1.0M hydrochloric acid (volume molar concentration), and place it in a 700mL electrochemical cell, which is heated to 50±0.5°C with a water bath.

[0066] A sample of 10×10×3.5mm (length×width×thickness) was cut from the plate, and the surface was machined into a six-sided pattern to prepare an electrochemical sample. The sample was used as the working electrode W, saturated with calomel The electrode is used as the reference electrode R, a...

Embodiment 2

[0070] 2101 duplex stainless steel was used for testing. The chemical composition weight percent of the steel is as follows: C 0.028, Mn 4.58, P0.022, S 0.0043, Si 0.6, Ni 1.99, Cr 20.98, Mo 0.03, N 0.22, and the rest are Fe and unavoidable impurity elements. The structure of the 2101 plate obtained by hot rolling and solution heat treatment at 1080°C for 3 hours, such as Figure 7 As shown, the proportion of ferrite α phase is about 67% (volume percentage):

[0071] Prepare a mixed solution of 0.3M copper sulfate (volume molar concentration) + 2.5M hydrochloric acid (volume molar concentration), and place it in a 700mL electrochemical cell, which is heated to 50±0.5°C with a water bath.

[0072] Cut and grind a sample of 10×10×0.5mm (length×width×thickness) from the plate, prepare an electrochemical sample, use the sample as the working electrode W, and use the saturated calomel electrode as the reference electrode R, platinum is used as the auxiliary electrode A, and a thr...

Embodiment 3

[0075] 2205 duplex stainless steel was used for testing. The chemical composition weight percent of the steel is as follows: C 0.025, Mn 1.18, P0.022, S 0.003, Si 0.56, Ni 4.86, Cr 22.41, Mo 3.16, N 0.14, and the rest are Fe and unavoidable impurity elements. The structure of the 2205 plate obtained by hot rolling and solution heat treatment at 1080 ° C for 1 h, such as Figure 10 As shown, the proportion of ferrite α phase is about 55% (volume percentage):

[0076] Prepare a mixed solution of 2.0M copper sulfate (volume molar concentration) + 2.0M hydrochloric acid (volume molar concentration), and place it in an 800mL electrochemical electrolytic cell, which is heated to 50±0.5°C with a water bath.

[0077] Cut a sample of 30×30×5mm (length×width×thickness) from the plate, machine the surface into a six-sided pattern, prepare an electrochemical sample, and use the sample as a working electrode W, a saturated calomel electrode As the reference electrode R and platinum as th...

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Abstract

The invention discloses a separation method of two-phase texture in two-phase stainless steel and a network ferrite cellular material and belongs to the technical field of stainless steel. The problemthat in the prior art, the single texture structure cannot be obtained from the two-phase stainless steel is solved. According to the separation method, the two-phase stainless steel is placed in a mixed solution of copper sulfate and hydrochloric acid to be subjected to electrokinetic potential anodic polarization, a double-peak polarization curve is obtained, the two-phase stainless steel is subjected to constant potential polarization in the mixed solution of the copper sulfate and the hydrochloric acid under an electric potential value corresponding to a dissolution peak with a high electric potential value, a ferritic phase of the two-phase stainless steel is obtained, and an Austenite phase of the two-phase stainless steel is obtained under an electric potential value correspondingto a dissolution peak with the low electric potential value. By the adoption of the separation method, the network ferrite cellular material can be prepared.

Description

technical field [0001] The invention relates to a stainless steel, in particular to a method for separating two-phase structures in a duplex stainless steel using the principle of selective dissolution, and a reticular ferrite microporous material. Background technique [0002] The matrix structure of duplex stainless steel is composed of a certain proportion of ferrite (α) phase and austenite phase (γ) phase. Due to this unique organizational feature, duplex stainless steel can combine the excellent toughness of austenitic stainless steel with the high strength and chloride stress corrosion resistance of ferritic stainless steel through correct control of chemical composition and heat treatment process. Chemical industry, marine engineering, nuclear power, construction, papermaking, food and other fields have received extensive attention and application. [0003] The performance of duplex stainless steel, especially its ductility and corrosion resistance, is closely relate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F1/06
CPCC25F1/06
Inventor 丰涵宋志刚郑文杰朱玉亮
Owner CENT IRON & STEEL RES INST
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