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A kind of preparation method of high-strength medium manganese steel plate

A manganese steel plate, high-strength technology, applied in the field of preparation of high-strength medium manganese steel plate, can solve problems such as Lüders strip deformation, steel surface wrinkles, no macro work hardening, etc.

Active Publication Date: 2019-11-12
江苏育材堂车身技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large number of literature studies have shown that after reverse phase transformation annealing of severely cold-rolled medium-manganese steel, equiaxed ferrite and austenite structures are formed, and Lüders band deformation is easy to occur during the deformation process, without macroscopic work hardening, and Causes surface wrinkles of steel parts, which cannot meet the requirements of stamping and forming of automobile sheets

Method used

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  • A kind of preparation method of high-strength medium manganese steel plate
  • A kind of preparation method of high-strength medium manganese steel plate
  • A kind of preparation method of high-strength medium manganese steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) Smelting and forging: 1# steel is smelted in a vacuum induction furnace, and its composition is shown in Table 1. The obtained molten steel is cast and forged to obtain a billet of 60mm×60mm×300mm.

[0065] (2) Hot rolling: heat the cast slab to 1150°C for 3 hours, start rolling at 1000°C, go through 7 passes of hot rolling, and finish at 800°C, with a total cumulative reduction of 96%, single pass The reduction ratio was 30%. Air-cool to room temperature after hot-rolling, and the thickness of the hot-rolled sheet is 2.5mm. Such as figure 1 As shown, the hot-rolled microstructure is dominated by lath martensite.

[0066] (3) Primary annealing: put the hot-rolled sheet into a box furnace at 620°C for 10 hours to simulate bell annealing, and air-cool to room temperature. figure 2 It is the SEM image of 1# steel annealed at 620°C for 10h and the surface scan image of the corresponding Mn element; the structure is lath ferrite and austenite, and there is cementite ...

Embodiment 2

[0073] (1) Smelting and forging: 2# steel was smelted in a vacuum induction furnace. The composition is shown in Table 1. The obtained molten steel was cast and forged to obtain a billet of 60mm×60mm×300mm.

[0074] (2) Hot rolling: heat the cast slab to 1200°C for 2 hours, start rolling at 1050°C, after 6 passes of hot rolling, finish rolling at 820°C, the total cumulative reduction is 96%, single pass The reduction ratio was 30%. Air cooling to 600°C after hot rolling, then furnace cooling, simulated coiling, the thickness of the hot rolled sheet is 2.4mm.

[0075] (3) Primary annealing: put the hot-rolled sheet into a box furnace at 650°C for 24 hours to simulate bell annealing, and air-cool to room temperature.

[0076] (4) Cold rolling: the above-mentioned annealed steel plate is cold-rolled, and the total cold-rolling reduction is 0% (no cold-rolling), 10%, and 15% respectively to obtain a cold-rolled plate. The cold-rolling reduction of the comparison process The amou...

Embodiment 3

[0082] (1) Smelting and forging: 3# steel was smelted in a vacuum induction furnace. The composition is shown in Table 1. The obtained molten steel was cast and forged to obtain a billet of 60mm×60mm×300mm.

[0083] (2) Hot rolling: heat the cast slab to 1250°C for 4 hours, start rolling at 1050°C, after 7 passes of hot rolling, finish at 780°C, total cumulative reduction is 95%, single pass The reduction ratio was 30%. Air-cool to room temperature after hot-rolling, and the thickness of the hot-rolled sheet is 3.1mm.

[0084] (3) Primary annealing: put the hot-rolled sheet into a box furnace at 600°C for 36 hours, simulate bell annealing, and air-cool to room temperature.

[0085](4) Cold rolling: the above-mentioned annealed steel plate is cold-rolled, and the total cold-rolling reduction is respectively 0% (no cold-rolling), 10%, and 18%, to obtain a cold-rolled plate, and the cold-rolling reduction of the comparison process The amounts are 40% and 50%.

[0086] (5) Seco...

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Abstract

A method for preparing a high-strength medium-manganese steel plate, belonging to the technical field of high-strength and tough steel plates; including the steps: 1) smelting according to the composition ratio of the high-strength medium-manganese steel plate, and then forging the blank after continuous casting or die casting; 2) adding the blank to heat preservation , after multiple passes of hot rolling and air cooling to room temperature, hot-rolled plates or hot-rolled coils are obtained; 3) After heating and heat preservation, the primary annealed plate is obtained by cooling, and 4) or 5) is performed directly; 4) The primary annealed steel plate is Cold rolling to obtain a cold-rolled plate; 5) Heating and heat preservation and then cooling to room temperature to obtain a high-strength medium manganese steel plate; its yield strength is 450-1000MPa, tensile strength is 800-1500MPa, elongation is 18%-60%, and uniaxial tensile strength is There is no Lüders band during stretching, and the yield elongation is ≤1%; while ensuring high strength and plastic accumulation, the steel plate shows continuous yielding when deformed, avoiding the occurrence of Lüders band deformation, which is beneficial to the cold stamping forming of the steel plate.

Description

technical field [0001] The invention belongs to the technical field of high-strength and tough steel plates, and in particular provides a preparation method of high-strength medium-manganese steel plates. Background technique [0002] High strength and toughness have always been the goal of the development of steel materials. The use of high-strength and toughness materials can improve the safety of parts, and can reduce the amount of materials used on the premise of ensuring safety, and realize the weight reduction of parts. All automobile manufacturers are working hard Realize vehicle weight reduction. With the rapid development of my country's automobile industry, the problems of energy consumption and environmental pollution have become increasingly prominent. Although the application of new energy in automobiles has slowed down the problem of environmental pollution, it has put forward higher requirements for the lightweight of automobiles. Iron and steel materials are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/58C22C38/38C22C38/04C22C38/34C22C38/02C22C38/06C22C38/12C22C38/14C22C38/16C22C38/08C22C38/32C22C38/54C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
CPCC21D8/0226C21D8/0236C21D8/0263C21D8/0273C21D2211/001C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/34C22C38/38C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 易红亮杨达朋杜鹏举吴迪
Owner 江苏育材堂车身技术有限公司
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