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Heat treatment technology of high-strength and high-plasticity ferrite-austenite duplex stainless steel

A technology of duplex stainless steel and ferrite, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as the layered structure heat treatment process of duplex stainless steel that no one has proposed, so as to eliminate layered structures and avoid harmful Phase formation, effect of inhibiting grain boundary austenite formation

Active Publication Date: 2019-03-19
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the existing heat treatment processes for duplex stainless steel are aimed at regulating the two-phase ratio of ferrite and austenite and dissolving harmful precipitated phases. No one has proposed a method that can regulate the layered structure of duplex stainless steel. heat treatment process

Method used

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  • Heat treatment technology of high-strength and high-plasticity ferrite-austenite duplex stainless steel
  • Heat treatment technology of high-strength and high-plasticity ferrite-austenite duplex stainless steel
  • Heat treatment technology of high-strength and high-plasticity ferrite-austenite duplex stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A heat treatment process for high-strength plastic ferrite-austenite duplex stainless steel is carried out according to the following steps:

[0027] Step 1: Select the hot-rolled s3 2205 duplex stainless steel plate, the content (wt.%) of the main alloying elements Cr, Ni, Mo, Mn, Si, N is: 22.5, 5.5, 3.1, 1.18, 0.496, 0.162. The hot-rolled s3 2205 ferritic-austenitic duplex stainless steel plate is placed in a resistance furnace, heated to 1350°C under atmospheric conditions, kept for 20 minutes, and then water-quenched to room temperature. Melting treatment; the resistance furnace used is a box-type resistance furnace with a rated power of 4kW, and the maximum operating temperature is 1400°C.

[0028] Step 2: at room temperature, cold rolling pre-deformation treatment with a reduction of 20% is performed on the s3 2205 duplex stainless steel plate after the primary solution treatment;

[0029] Step 3: Place the pre-deformed s3 2205 stainless steel plate in the resis...

Embodiment 2

[0032] A heat treatment process method for high-strength plastic ferrite-austenite duplex stainless steel is carried out according to the following steps:

[0033] Step 1: Select the hot-rolled s3 2205 duplex stainless steel plate, the content (wt.%) of the main alloying elements Cr, Ni, Mo, Mn, Si, N is: 22.5, 5.5, 3.1, 1.18, 0.496, 0.162. Put the hot-rolled s3 2205 ferritic-austenitic duplex stainless steel plate in a resistance furnace, heat it up to 1350°C under atmospheric conditions, keep it for 40 minutes, and then perform water quenching treatment to room temperature. This process is a first-class solidification process. Melting treatment; the resistance furnace used is a box-type resistance furnace with a rated power of 4kW, and the maximum operating temperature is 1400°C.

[0034] Step 2: at room temperature, cold rolling pre-deformation treatment with a reduction of 40% is performed on the duplex stainless steel plate after the primary solution treatment;

[0035] ...

Embodiment 3

[0038] A heat treatment process method for high-strength plastic ferrite-austenite duplex stainless steel is carried out according to the following steps:

[0039] Step 1: Select the hot-rolled s3 2205 duplex stainless steel plate, the content (wt.%) of the main alloying elements Cr, Ni, Mo, Mn, Si, N is: 22.5, 5.5, 3.1, 1.18, 0.496, 0.162. Put the hot-rolled s3 2205 ferritic-austenitic duplex stainless steel plate in a resistance furnace, heat it up to 1350°C under atmospheric conditions, keep it for 60 minutes, and then perform water quenching treatment to room temperature. This process is a first-class solidification process. Melting treatment; the resistance furnace used is a box-type resistance furnace with a rated power of 4kW, and the maximum operating temperature is 1400°C;

[0040] Step 2: at room temperature, the s3 2205 duplex stainless steel plate after the primary solution treatment is subjected to a cold rolling pre-deformation treatment with a reduction of 60%;

...

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Abstract

The invention belongs to the technical field of material heat treatment, and discloses a heat treatment technology of high-strength and high-plasticity ferrite-austenite duplex stainless steel. The heat treatment technology comprises the following steps of (1) first-stage solution treatment, (2) predeformation treatment and (3) second-stage solution treatment. After the technology is adopted for treating the ferrite-austenite duplex stainless steel, a traditional dual phase structure of the duplex stainless steel can be eliminated, wherein two phases of the dual phase structure are alternatelydistributed in a layer shape; and a dual phase structure of an equiaxial austenite particle phase and a ferrite matrix phase can be obtained, and the product of strength and elongation of a materialcan be improved by 50% or above.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment, and in particular relates to a heat treatment process capable of regulating the microstructure of ferrite-austenite duplex stainless steel and improving the strong plasticity of duplex stainless steel. Background technique [0002] Duplex stainless steel has excellent strong plasticity and chloride stress corrosion resistance, and is widely used in oil and gas transportation, chemical storage, seawater desalination and other fields. The composition of duplex stainless steel is designed so that two phases of ferrite and austenite exist in the microstructure at the same time, and the volume percentage of the two phases is not less than 30%. [0003] However, most of the existing commercial products of duplex stainless steel are supplied in the hot-rolled or cold-rolled state, and the two phases of ferrite and austenite in the microstructure are elongated along the rolling direction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/78C21D6/00C21D8/02C21D9/00C22C38/02C22C38/04C22C38/44
CPCC21D1/78C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0236C21D9/0081C21D2211/001C21D2211/005C22C38/001C22C38/02C22C38/04C22C38/44
Inventor 王建军吴天海李花兵姜周华刘春明
Owner NORTHEASTERN UNIV
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