Manufacturing method of 1000MPa-grade high-reaming type cold-rolled bainite steel

A technology of bainite steel and manufacturing method, which is applied in the field of materials, can solve the problems that are not conducive to large-scale industrial production, increase the production cost of steel plants, and easily cause banded structures, etc., so as to improve industrial production efficiency, improve uniformity, The effect of refining the tissue

Active Publication Date: 2017-05-10
NORTHEASTERN UNIV
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  • Application Information

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Problems solved by technology

, the tensile strength of the steel plate is 900-1300MPa, and the plasticity is 24-37%; but this method adds such a high Mn content, it is easy to form a banded structure, which is not conducive to ensuring the uniformity of the structure, and it is easy to cause local forming cracks
[0007] Chinese patent CN105506478A introduces a high-formability cold-rolled ultra-high-strength steel plate, steel strip and its manufacturing method. The composition weight percentage is: C: 0.15-0.35%, Si: 1.0-2.0%, Mn: 1.6-2.6 %, Mo: 0.1-0.4%, P≤0.02%, S≤0.004%, N≤0.005%, Nb: 0.015-0.04%, Ti: 0.02-0.06%, Al: 0.015-0.045%, B: 0.0003-0.001 %, and, B≥P%/30, and the rest are Fe and unavoidable impurities. The tensile strength of the cold-rolled ultra-high-strength steel plate in this method is ≥980MPa, the elongation is ≥15%, the hole expansion rate is ≥40%, and the performance is bal

Method used

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  • Manufacturing method of 1000MPa-grade high-reaming type cold-rolled bainite steel
  • Manufacturing method of 1000MPa-grade high-reaming type cold-rolled bainite steel

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Smelting and casting according to the set composition to make a slab, the composition contains by weight percentage: C 0.19%, Si 1.3%, Mn 1.5%, Al 0.01%, Nb 0.045%, P≤0.010%, S≤0.010%, the rest Fe and unavoidable impurities;

[0045] The billet is heated at 1200±30°C for 2~3h and then hot rolled, the rolling start temperature is 1150~1180°C, the final rolling temperature is 850~900°C, the total reduction is 91%, and the hot rolled steel plate is obtained;

[0046] Cold-rolling the hot-rolled steel plate after pickling, with a total reduction rate of 65%, to obtain a cold-rolled steel plate;

[0047] Wash the cold-rolled steel sheet with alkali to remove the rolling oil, raise the temperature to 870°C at a rate of 50°C / s, and keep it warm for 5s for austenitization;

[0048] Cool the austenitized cold-rolled steel plate to 360°C at a rate of 80°C / s, hold it for 150s, and then cool it to room temperature to make a high-hole-expanding cold-rolled bainite steel with a tens...

Embodiment 2

[0050] Method is with embodiment 1, and difference is:

[0051] (1) The composition of the slab contains by weight percentage: C 0.25%, Si 1.6%, Mn 1.75%, Al 0.05%, Nb 0.05%, P≤0.010%, S≤0.010%, and the rest are Fe and unavoidable impurities;

[0052] (2) The casting slab is heated at 1200±30°C for 2~3h and then hot-rolled. The starting rolling temperature is 1180°C, the final rolling temperature is 900°C, and the total reduction is 93%;

[0053] (3) The total reduction rate of cold rolling is 89%;

[0054] (4) Raise the temperature to 950°C at a rate of 300°C / s, and hold for 120s for austenitization;

[0055] (5) The cold-rolled steel plate is cooled to 420°C at a rate of 150°C / s, held for 500s, and then cooled to room temperature to make a high-expansion cold-rolled bainite steel with a tensile strength of 1000MPa and retained austenite Volume fraction of 17.2%, tensile strength Rm=1135MPa, elongation A 50 mm=17.6%, expansion rate=62%.

Embodiment 3

[0057] Method is with embodiment 1, and difference is:

[0058] (1) The composition of the slab contains by weight percentage: C 0.20%, Si 1.40%, Mn 1.6%, Al 0.03%, Nb 0.045%, P≤0.010%, S≤0.010%, and the rest are Fe and unavoidable impurities;

[0059] (2) The casting slab is heated at 1200±30°C for 2~3 hours and then hot-rolled. The starting rolling temperature is 1150°C, the final rolling temperature is 880°C, and the total reduction is 92.5%;

[0060] (3) The total reduction rate of cold rolling is 79%;

[0061] (4) Raise the temperature to 900°C at a rate of 80°C / s, and hold for 30s for austenitization;

[0062] (5) The cold-rolled steel plate is cooled to 400°C at a rate of 100°C / s, held for 180s, and then cooled to room temperature to make a high-expansion cold-rolled bainite steel with a tensile strength of 1000MPa and retained austenite Volume fraction of 16.1%, tensile strength Rm=1043MPa, elongation A 50 mm=24.7%, expansion rate=58%.

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Abstract

The invention relates to a manufacturing method of 1000MPa-grade high-reaming type cold-rolled bainite steel. The manufacturing method of the 1000MPa-grade high-reaming type cold-rolled bainite steel comprises the following steps of (1) smelting and casting a casting blank, which is prepared from the following components: 0.19 to 0.25 percent of C, 1.3 to 1.6 percent of Si, 1.5 to 1.75 percent of Mn, 0.045 to 0.05 percent of Nb, 0.01 to 0.05 percent of Al, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, and the balance Fe; (2) heating for 2 to 3h at the temperature of 1200+/-30 DEG C, and then hot rolling; (3) cold rolling after acid pickling; (4) keeping warm at the temperature of 870 to 950 DEG C for 5 to 120s, and then austenitizing; and (5) cooling to 360 to 420 DEG C, keeping warm for 150 to 500s, and then cooling to the room temperature. According to the manufacturing method of the 1000MPa-grade high-reaming type cold-rolled bainite steel provided by the invention, through a reasonable optimal composition design, and by utilizing fast heating and follow-up superfast cooling continuous annealing processes, a structure of the steel can be refined, the uniformity of the structure is improved, and high strength ductility and local forming performance of the material are ensured.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for manufacturing 1000MPa-level high-hole-expanding cold-rolled bainite steel. Background technique [0002] The driving resistance of a car is directly proportional to the weight of the car. The increase in the weight of the car will consume most of the fuel consumption on its own weight. When the speed is below 100 kilometers per hour, the weight factor determines 80% of the fuel consumption. According to the report of the International Aluminum Association, for every 10% reduction in vehicle weight, fuel consumption can be reduced by 6-8%. Therefore, lightweight is an important way to save fuel; "Made in China 2025" ten areas of energy conservation and new energy vehicles clearly propose the development of lightweight materials to form a complete industrial system and innovation system from key components to complete vehicles. The current new direction ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/06C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0247C21D2211/001C21D2211/002C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 李建平张俊潇蓝慧芳花福安
Owner NORTHEASTERN UNIV
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