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Preparation method of low-magnetism stainless steel medium plate with yield strength being 785MPa

A yield strength and stainless steel technology, which is applied in the field of low-magnetic stainless steel medium and thick plates, can solve the problems of reduced yield strength of steel plates and unreachable yield strength of thick plates, so as to avoid deformation structure, coarse structure, decomposition and aggregation growth Effect

Active Publication Date: 2020-11-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the yield strength of the 2.8-3.5mm non-magnetic stainless steel hot-rolled plate produced by the above-mentioned patent method exceeds 800MPa, the yield strength of the steel plate gradually decreases with the increase of the thickness specification, and the 20-80mm low-magnetism The yield strength of stainless steel plate cannot reach 785MPa

Method used

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  • Preparation method of low-magnetism stainless steel medium plate with yield strength being 785MPa
  • Preparation method of low-magnetism stainless steel medium plate with yield strength being 785MPa
  • Preparation method of low-magnetism stainless steel medium plate with yield strength being 785MPa

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Embodiment 1

[0035] A preparation method for a low-magnetic stainless steel plate with a yield strength of 785MPa, comprising the steps of:

[0036] 1. Vacuum smelting: batching according to the set chemical composition: weight percentage C: 0.07%, Si: 0.2%, Mn: 1.8%, Mo: 2.1%, Cr: 14%, Ni: 21%, Nb: 0.6%, Ti: 2.2%, Al: 1.1%, P≤0.05%, S≤0.05%, and the balance is Fe. Vacuum induction furnace is used for smelting. First, pure iron and aluminum-containing deoxidizer are added. After vacuuming for 40 minutes, argon gas is poured into the furnace to reach 0.09MPa. , Cr, Ni, Mo, Ti, and Al are added to the melting furnace in sequence, and after electromagnetic stirring, the tapping temperature is 1500-1600°C, and cast into 4 rod-shaped ingots of Φ100*600;

[0037] 2. Electroslag remelting: Weld four rod-shaped ingots of Φ100*600 into one long ingot, and obtain an electroslag ingot of Φ166mm*624mm after electroslag remelting;

[0038] 3. Forging: The heating temperature before electroslag ingot ...

Embodiment 2

[0046] A preparation method for a low-magnetic stainless steel plate with a yield strength of 785MPa, comprising the steps of:

[0047] 1. Vacuum smelting: batching according to the set chemical composition: weight percentage C: 0.06%, Si: 0.2%, Mn: 2%, Mo: 2%, Cr: 16%, Ni: 23%, Nb: 0.5%, Ti: 2.4%, Al: 1.1%, P≤0.05%, S≤0.05%, and the balance is Fe. Vacuum induction furnace is used for smelting. First, pure iron and aluminum-containing deoxidizer are added. After vacuuming for 40 minutes, argon gas is poured into the furnace to reach 0.09MPa. , Cr, Ni, Mo, Ti, and Al are added into the melting furnace in sequence, and after electromagnetic stirring, the tapping temperature is 1500-1600°C, and cast into rod-shaped ingots;

[0048] 2. Electroslag remelting: Weld four rod-shaped ingots of Φ100*600 into a long ingot, and obtain an electroslag ingot of Φ174mm*621mm after electroslag remelting;

[0049] 3. Forging: The heating time before electroslag ingot forging is greater than o...

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Abstract

The invention relates to a preparation method of a low-magnetism stainless steel medium plate with the yield strength being 785MPa, and belongs to the metallurgy field. The method comprises the stepsof carrying out vacuum melting, carrying out electroslag remelting, forging, carrying out controlled rolling and carrying out heat treatment. According to the method provided by the invention, a controlled rolling process and a heat treatment process are set according to the target thickness of a low-magnetism stainless steel plate; a preparation method comprising controlled rolling in an unrecrystallized zone, low-temperature solid solution treatment and two-stage aging treatment is adopted for a low-magnetic stainless steel plate with the thickness being larger than or equal to 20mm and smaller than or equal to 40mm; and a preparation method comprising controlled rolling under small pressure in an incompletely recrystallized zone and direct two-stage aging treatment after hot rolling isadopted for a low-magnetic stainless steel plate with the thickness being larger than 40mm and smaller than or equal to 80mm. A low-magnetic stainless steel plate with the thickness ranging from 20mmto 80mm has the performance indexes that the yield strength is larger than or equal to 785MPa, the tensile strength is larger than or equal to 1100MPa, the elongation percentage is larger than or equal to 15 percent, and the relative magnetic permeability is smaller than or equal to 1.005.

Description

[0001] background field [0002] The invention belongs to the field of metallurgy, in particular to a low-magnetic stainless steel plate, in particular to a preparation method for a 20mm-80mm thick low-magnetic stainless steel plate with a yield strength of 785MPa. Background technique [0003] Low magnetic stainless steel is composed of stable single-phase austenite at room temperature, and basically does not produce magnetic induction under the action of a magnetic field, and the relative magnetic permeability is slightly greater than 1. At present, low-magnetic stainless steel has been widely used in fields such as electric power, rail transit, construction, and national defense and military industry, such as key non-magnetic components and Minesweeper hulls, etc. At present, the yield strength of 20-80mm thick low magnetic stainless steel plate is far lower than 785MPa, which cannot meet the requirements. [0004] The patent No. ZL 201810224633.9 proposes a non-magnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/48C22C38/50C22C38/58C22C33/06C21D8/02C21D1/18
CPCC22C38/02C22C38/04C22C38/58C22C38/48C22C38/50C22C38/06C22C38/002C22C33/06C21D8/0226C21D1/18
Inventor 李长生李坤董竞博邵志保韩亚辉
Owner NORTHEASTERN UNIV
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