Method for manufacturing cold-rolled medium manganese steel plate with high strength and plasticity and free of yield platform

A high-strength plastic product, non-yielding technology, applied in the field of automotive steel, can solve the problems of yield plateau, high energy consumption, complex production process and technology, achieve high plastic mechanical properties, eliminate yield plateau phenomenon, and excellent mechanical properties.

Active Publication Date: 2018-03-30
NORTHEASTERN UNIV
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Problems solved by technology

The patent application with application number CN201410433852.X discloses a short-process manufacturing method for low-carbon steel plates without yield platforms, which solves the problems of complex production processes, many m...

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  • Method for manufacturing cold-rolled medium manganese steel plate with high strength and plasticity and free of yield platform
  • Method for manufacturing cold-rolled medium manganese steel plate with high strength and plasticity and free of yield platform
  • Method for manufacturing cold-rolled medium manganese steel plate with high strength and plasticity and free of yield platform

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preparation example Construction

[0034] In the specific implementation process, the high-strength plastic product and non-yield platform cold-rolled medium manganese steel plate and its preparation method described in the present invention specifically include the following steps:

[0035] (1) Smelting medium manganese steel into steel ingots, the specific alloy composition is based on mass percentage C=0.1-0.15%, Mn=6.9-7.2%, Si=1-1.2%, P<0.005%, S<0.003%, Al =0.05~1%, the balance is Fe and unavoidable impurities, heat the ingot to 1650°C, keep it warm for 2~3h, and forge it into a billet;

[0036] (2) Put the billet into a high-temperature furnace at 1100-1200°C, keep it warm for 2-3 hours, and hot-roll it into a thin plate with a thickness of 4-5mm after 9 passes. The initial rolling temperature is 1100-1150°C, and the final rolling temperature is not low. at 900°C, then air cooled to room temperature.

[0037] (3) Heat treatment before cold rolling: Put the hot-rolled steel plate into the RX-36-10 box-ty...

Embodiment 1

[0046] In this example, the preparation method of cold-rolled medium-manganese steel plate with high-strength plastic product and no-yield platform, its alloy composition and weight percentage are respectively: C=0.1%, Mn=6.9%, Si=1%, P=0.0042% , S=0.0025%, Al=0.052%, and the balance is Fe and unavoidable impurities.

[0047] In this embodiment, the high-strength plastic product non-yielding platform cold-rolled medium manganese steel plate and its preparation method, the specific steps are as follows:

[0048] Step 1, smelting and forging:

[0049] According to the alloy composition ratio of cold-rolled medium-manganese steel with high-strength plastic product and no-yield platform, smelting is carried out at 1650°C, and steel ingots with a thickness of 100-110mm are forged afterward;

[0050] Step 2, hot rolling:

[0051] Heat the billet to 1100°C and keep it warm for 2 hours;

[0052] The starting rolling temperature is 1100°C, the final rolling temperature is 930°C, the...

Embodiment 2

[0064] In this example, the preparation method of cold-rolled medium-manganese steel plate with high-strength plastic product without yield platform, its alloy composition and weight percentage are: C 0.1%, Si 1.3%, Mn 7.13%, P=0.0035%, S 0.0028 %, Al0.052%, O 0.0026%, N 0.0031%, and the rest are Fe and unavoidable impurities.

[0065] In this embodiment, the preparation method of the cold-rolled medium-manganese steel plate with high-strength plastic product without yield platform, the specific steps are as follows:

[0066] Step 1, smelting and forging:

[0067] According to the alloy composition ratio of cold-rolled medium-manganese steel with high-strength plastic product and no-yield platform, it is melted at 1650°C, and then forged into a steel ingot with a thickness of 100mm;

[0068] Step 2, hot rolling:

[0069] Heat the billet to 1150°C and keep it warm for 3h;

[0070] The starting rolling temperature is 1150°C, the final rolling temperature is 930°C, the rolling...

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Abstract

The invention relates to the technical field of automobile steel, in particular to a method for manufacturing a cold-rolled medium manganese steel plate with high strength and plasticity and free of yield platform. The manufacturing method mainly comprises the following steps of (1) smelting and forging; (2) full-austenitizing rolling, wherein a steel blank is heated to 1100-1200 DEG C, heat preservation is carried out for 2-3 hours, then full-austenitizing rolling is carried out, the steel blank is rolled to 4-5mm thick, and the steel blank is naturally cooled to room temperature; (3) pre-annealing before cold rolling, wherein the steel plate subjected to hot rolling is heated to 640-650 DEG C in a two-phase-region along with a furnace, heat preservation is carried out for 6-8 hours, thenthe steel plate is cooled to 200-300 DEG C along with the furnace, and then the steel plate is air cooled to the room temperature; (4) cold rolling, wherein the steel plate subjected to hot rolling and annealing is rolled to 1-2mm thick by a cold rolling machine; and (5) two-step heat treatment after cold rolling, wherein the purpose is to change the structure and the shape of the steel plate, the shape of the steel plate is changed into a strip shape from an isometric shape, and the structure of the steel plate is composed of ferrite and austenite. According to the manufacturing method, thesteel plate with high strength and plasticity is obtained, meanwhile, the stress-strain curve is continuously yield, and the common yield platform phenomenon in cold-rolled manganese steel is eliminated.

Description

technical field [0001] The invention relates to the technical field of steel for automobiles, in particular to a method for preparing a high-strength plastic product without yield platform cold-rolled medium manganese steel plate. Background technique [0002] Energy saving, environmental protection, light weight and safety have become the development trend of the automobile industry, making automobile manufacturers increase the use of high-strength, high-plasticity, low-density automotive steel. Advanced high-strength steel can reduce the weight of the car body while increasing the strength, reduce energy consumption, improve vehicle performance, and reduce CO 2 emissions; and its high strength improves the impact absorption work in car collisions and improves the safety of cars. As the representative of the third generation of advanced high-strength steel, medium manganese steel is favored by the automotive industry due to its excellent mechanical properties such as alloy...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C21D8/02
CPCC21D8/0236C21D8/0247C22C33/04C22C38/02C22C38/04C22C38/06
Inventor 许云波韩仃停邹英胡智评陈树青
Owner NORTHEASTERN UNIV
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