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A kind of low-carbon, medium-manganese, high-para austic, high-strength and tough steel and heat treatment method thereof

A heat treatment method and paralyzed technology, which is applied in the field of low-carbon, medium-manganese, high-paralyzed, high-strength, high-strength and tough steel and its heat treatment field, can solve the problems of long annealing time and slow acquisition efficiency of retained austenite in low-carbon medium-manganese steel, and achieve improved Effects of yield strength and tensile strength, inhibition of recrystallization process, and reduction of time required

Active Publication Date: 2021-11-26
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a low-carbon, medium-manganese, high-residual austenite, high-strength and tough steel and its heat treatment method to solve the technical problems of long annealing time and slow acquisition efficiency of residual austenite in low-carbon, medium-manganese steel in the prior art. Rapid heating technology further optimizes the yield strength and tensile strength of the material while increasing production efficiency

Method used

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  • A kind of low-carbon, medium-manganese, high-para austic, high-strength and tough steel and heat treatment method thereof
  • A kind of low-carbon, medium-manganese, high-para austic, high-strength and tough steel and heat treatment method thereof
  • A kind of low-carbon, medium-manganese, high-para austic, high-strength and tough steel and heat treatment method thereof

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Embodiment 1

[0048] For the steel with the specific composition of Fe-0.23C-5.38Mn-1.7Al (wt.%), after electric furnace melting and continuous casting, a slab with a thickness of 250mm is formed, and then hot rolled to a thickness of 5mm by a single-stand rolling mill, and the final control The rolling temperature is higher than 800°C, and then air-cooled to form a martensitic matrix structure. Low-temperature tempering, cold rolling and continuous annealing are carried out on the hot-rolled steel plate. The specific process is as follows:

[0049] 1. Temper the hot-rolled sheet at a low temperature of 500°C / 1h in a muffle furnace, and then cold-roll it to a thickness of 1.0mm;

[0050] 2. Raise the temperature of the cold-rolled steel strip from room temperature to 500°C at a heating rate of 30°C / s, and then rapidly raise the temperature from 500°C to 760°C at a heating rate of 100°C / s;

[0051] 3. Insulate at 760°C for 0.5s;

[0052] 4. Cool the steel strip from 760°C to 600°C at a coo...

Embodiment 2

[0057] For the steel whose specific composition is Fe-0.23C-5.4Mn-1.7Al (wt.%), after electric furnace smelting and continuous casting, a slab with a thickness of 250 mm is formed, and then hot rolled to a thickness of 5 mm by a single-stand rolling mill, and the final control is carried out. The rolling temperature is higher than 800°C, and then air-cooled to form a martensitic matrix structure. Low-temperature tempering, cold rolling and continuous annealing are carried out on the hot-rolled steel plate. The specific process is as follows:

[0058] 1. Temper the hot-rolled sheet at a low temperature of 500°C / 1h in a muffle furnace, and then cold-roll it to a thickness of 1.0mm;

[0059] 2. Raise the temperature of the cold-rolled steel strip from room temperature to 500°C at a heating rate of 30°C / s, and then rapidly raise the temperature from 500°C to 740°C at a heating rate of 100°C / s;

[0060] 3. Insulate at 740°C for 1.0s;

[0061] 4. Cool the steel strip from 740°C to...

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Abstract

The invention belongs to the technical field of heat treatment of materials, and in particular relates to a low-carbon, medium-manganese, high-residue, high-strength and tough steel and a heat treatment method thereof. The mass percentage ratio of the chemical composition of the steel is: C: 0.10-0.25%, Mn: 4.0-8.0%, Al: 1.0-2.5%, and the balance is Fe and other unavoidable impurities. In this method, after the steel smelting, continuous casting, hot rolling and other processes, the hot-rolled steel plate is subjected to the following heat treatment: low temperature tempering-cold rolling-rapid heating-two-phase zone isothermal for a very short time-rapid cooling. The average grain size of retained austenite in the final high-strength steel is less than 200nm, the volume fraction can reach 15%-40%, and the matrix is ​​a heterogeneous structure of equiaxed recrystallized ferrite + strip unrecrystallized ferrite; The yield strength is in the range of 800MPa‑1200MPa, the tensile strength is in the range of 1200MPa‑1500MPa, and the uniform elongation can be achieved at 10%‑20%. The invention obtains excellent mechanical properties and realizes high-efficiency heat treatment at the same time by improving the morphology of the ferrite matrix and the volume fraction and grain size of the retained austenite.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of materials, and in particular relates to a low-carbon, medium-manganese, high-residue, high-strength and tough steel and a heat treatment method thereof. Background technique [0002] With the continuous advancement of science and technology and the increasing awareness of environmental protection and safety of people, major steel manufacturers in the world are devoting themselves to the research and development of advanced high-strength steel with high strength and plastic product (that is, the product of tensile strength and total elongation). Meet people's requirements for lightweight vehicles, energy saving and emission reduction, and high safety. In recent years, the third-generation advanced high-strength steel medium-manganese steel has attracted extensive attention from domestic and foreign industries and academia because of its good comprehensive mechanical properties and cost ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C21D8/02
CPCC21D8/0205C21D8/0236C21D8/0247C21D2211/001C21D2211/005C22C38/04C22C38/06Y02P10/20
Inventor 陈浩万鑫浩刘赓杨志刚
Owner TSINGHUA UNIV
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