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High-strength plastic-laden low-carbon silicon-manganese q&p steel plate and its preparation method by asynchronous rolling

A high-strength plastic product, asynchronous rolling technology, applied in the field of material processing, to achieve good plasticity, reduce rolling force, and refine grains

Active Publication Date: 2018-05-04
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem in the prior art that improving the mechanical properties of Q&P steel is mainly concentrated in the heat treatment stage, the present invention provides a high-strength plasticity low-carbon silicon-manganese series Q&P steel plate and a preparation method of asynchronous rolling. The asynchronous rolling method is adopted in the rolling stage, the purpose is to effectively refine the grains through asynchronous rolling, and produce low-carbon silicon-manganese Q&P steel with high strength and plastic product

Method used

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  • High-strength plastic-laden low-carbon silicon-manganese q&p steel plate and its preparation method by asynchronous rolling
  • High-strength plastic-laden low-carbon silicon-manganese q&p steel plate and its preparation method by asynchronous rolling
  • High-strength plastic-laden low-carbon silicon-manganese q&p steel plate and its preparation method by asynchronous rolling

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]A high-strength ductile low-carbon silicon-manganese Q&P steel plate, the mass percentage of its chemical components is: C: 0.18%, Mn: 1.44%, Si: 1.48%, Al: 0.15%, Nb: 0.025%, and The amount is Fe and other unavoidable impurities.

[0042] The preparation method of the asynchronous rolling of the above-mentioned high-strength plasticity low-carbon silicon-manganese series Q&P steel plate comprises the following steps:

[0043] Step 1, prepare the slab:

[0044] After smelting and casting according to the chemical composition of high-strength plasticity low-carbon silicon-manganese series Q&P steel, a slab with a thickness of 30mm is obtained, wherein the forging heating temperature is 1250°C, the holding time is 3h, and the forging deformation temperature is 900-1050°C;

[0045] Step 2, asynchronous rolling:

[0046] (1) Heat the Q&P steel slab to 1200°C for 2 hours;

[0047] (2) After asynchronously rolling the Q&P steel slabs after heat preservation, air-cool to roo...

Embodiment 2

[0053] A high-strength plastic-laden low-carbon silicon-manganese Q&P steel plate, the mass percentage of its chemical components is: C: 0.21%, Mn: 1.52%, Si: 1.55%, Al: 0.13%, Nb: 0.05%, and The amount is Fe and other unavoidable impurities.

[0054] The preparation method of the asynchronous rolling of the above-mentioned high-strength plasticity low-carbon silicon-manganese series Q&P steel plate comprises the following steps:

[0055] Step 1, prepare the slab:

[0056] After smelting and casting according to the chemical composition of high-strength plasticity low-carbon silicon-manganese Q&P steel, a slab with a thickness of 30mm is obtained. The forging heating temperature is 1220°C, the holding time is 2.5h, and the forging deformation temperature is 900-1050°C. ;

[0057] Step 2, asynchronous rolling:

[0058] (1) Heat the Q&P steel slab to 1250°C for 2 hours;

[0059] (2) After asynchronously rolling the Q&P steel slabs after heat preservation, air-cool to room te...

Embodiment 3

[0065] A high-strength plastic-laden low-carbon silicon-manganese Q&P steel plate, the mass percentage of its chemical components is: C: 0.23%, Mn: 1.58%, Si: 1.60%, Al: 0.17%, Nb: 0.06%, and The amount is Fe and other unavoidable impurities.

[0066] The preparation method of the asynchronous rolling of the above-mentioned high-strength plasticity low-carbon silicon-manganese series Q&P steel plate comprises the following steps:

[0067] Step 1, prepare the slab:

[0068] After smelting and casting according to the chemical composition of high-strength plasticity low-carbon silicon-manganese Q&P steel, a slab with a thickness of 30mm was obtained. The forging heating temperature was 1200°C, the holding time was 2h, and the forging deformation temperature was 900-1050°C.

[0069] Step 2, asynchronous rolling:

[0070] (1) Heat the Q&P steel slab to 1230°C for 2 hours;

[0071] (2) After asynchronously rolling the Q&P steel slabs after heat preservation, air-cool to room tem...

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Abstract

A high-strength plastic-deposited low-carbon silicon-manganese series Q&P steel plate and a preparation method for asynchronous rolling; the mass percentage content of the steel plate components: C: 0.18~0.23%, Mn: 1.40~1.60%, Si: 1.30~1.60%, Al: 0.10~0.20%, Nb: 0.02~0.06%, S: <0.01%, P: <0.01%, the remaining Fe and unavoidable impurities, thickness ‑‑mm; Method: 1) Smelt according to Q&P steel composition, cast billet After that, the slab is forged; 2) The slab is heated and insulated, and after asynchronous rolling, it is air-cooled to room temperature to obtain a rolled steel plate; 3) After the rolled steel plate is insulated at the two-phase zone, it is quenched to the martensitic transformation zone, insulated, and then heated. The Q&P steel plate is obtained by air-cooling to room temperature; the Q&P steel plate of the present invention is a mixed multi-phase structure of martensite, ferrite and retained austenite, with a yield strength of 510-640MPa and a tensile strength of 720 ~860MPa, the elongation is 38~44%, and the strong plastic volume is 27600~34700MPa·%.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a high-strength plastic product low-carbon silicon-manganese Q&P steel plate and a preparation method of asynchronous rolling. Background technique [0002] While automobiles bring convenience to people, they also bring many problems such as traffic congestion and environmental pollution. Therefore, the development of "environmentally friendly vehicles" characterized by low fuel consumption and low emissions has become a future development trend. Statistics show that every 10% reduction in the quality of the car itself can save 3% to 7% of fuel. Therefore, the weight reduction of automobiles is an important way to reduce fuel consumption, and it is of great significance to energy saving and environmental improvement. Automobile lightweight has become the development trend of the advanced automobile industry, which brings challenges to the research and development ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C21D8/02
CPCC21D8/0221C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 唐正友卢兴超黄家能丁桦梁孟甜蔡志辉
Owner NORTHEASTERN UNIV LIAONING
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