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One-steel dual-purpose cold-rolled high-strength steel based on carbon partitioning process and manufacturing method thereof

A technology of carbon distribution and high-strength steel, which is applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of inability to cover strength levels and steel types, extremely high production line capacity requirements, and difficult process control, etc., to achieve product integration Good performance, reduce the production and operation cost of the enterprise, and avoid the effect of reheating process

Active Publication Date: 2020-04-07
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above technical solutions are all based on carbon partitioning technology. The initial structure is formed by quenching first, and then the carbon partitioning is carried out by heating again to finally form part of the retained austenite structure to obtain higher strength and plasticity, but it cannot cover different strength levels and The type of steel, the reheating method has extremely high requirements on the production line capacity and the process control is difficult, and the cost of steel per ton increases by 50 to 100 yuan. Therefore, there is an urgent need for a method that can cover different strength levels and steel types, which is suitable for industrial production and process. Easy to control, high-strength steel production method that can reduce costs and increase efficiency for enterprises

Method used

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  • One-steel dual-purpose cold-rolled high-strength steel based on carbon partitioning process and manufacturing method thereof
  • One-steel dual-purpose cold-rolled high-strength steel based on carbon partitioning process and manufacturing method thereof
  • One-steel dual-purpose cold-rolled high-strength steel based on carbon partitioning process and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Production of TRIP780 steel grades:

[0024] The smelting chemical composition includes: 0.20% C, 1.6% Si, 1.9% Mn, 0.20% Cr, 0.040% Nb, 0.035% Ti, 0.035% Al, 0.0021% B, 0.007% S, 0.003% P in terms of weight percentage.

[0025] Hot rolling process:

[0026] The heating temperature is 1230°C, and the heat preservation time is 2.2 hours; the starting rolling temperature is 1150°C; the intermediate billet temperature after rough rolling is 990°C; the final rolling temperature is 890°C; the coiling temperature is 710°C, and finally a 3.2mm thick hot rolled steel plate .

[0027] Cold rolling process:

[0028] The reduction rate of cold rolling is 62.5%, the rolling target specification is 1.2mm, the temperature of the acid solution is 86°C, and the pickling speed is 110m / min.

[0029] The annealing process for TRIP780 production by rapid cooling to the bainite medium temperature transformation zone is:

[0030]

[0031] Through heat preservation in the two-phase zon...

Embodiment 2

[0035] QP980 steel production:

[0036] The smelting chemical composition includes: 0.22% C, 1.8% Si, 2.2% Mn, 0.25% Cr, 0.035% Nb, 0.04% Ti, 0.03% Al, 0.0025% B, 0.009% S, 0.007% P in terms of weight percentage.

[0037]Hot rolling process: heat the billet in a walking heating furnace at a heating temperature of 1250°C and hold for 2.3 hours; the starting rolling temperature is 1160°C; the intermediate billet temperature after rough rolling is 980°C; the final rolling temperature is 885°C; The coiling temperature is 700° C., and a hot-rolled steel sheet with a thickness of 2.5 mm is finally obtained.

[0038] Cold rolling process:

[0039] The reduction rate of cold rolling is 60%, the rolling target specification is 1.0mm, the temperature of the acid solution is 88°C, and the pickling speed is 100m / min.

[0040] The annealing process for QP980 production by rapid cooling to the martensitic low-temperature transformation zone is:

[0041]

[0042] Through heat preservat...

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Abstract

The invention belongs to the cold-rolled high-strength steel production and manufacturing technology field and and relates to one-steel dual-purpose cold-rolled high-strength steel based on a carbon partitioning process and a manufacturing method thereof. Chemical components comprise, by weight, 0.20%-0.30% of C, 1.5%-2.5% of Si, 2.0%-3.0% of Mn, 0.2%-0.4% of Cr, 0.03%-0.06% of Nb, 0.02%-0.10% ofTi, 0.02%-0.40% of Al, 0.002%-0.005% of B, S being less than 0.015%, P being less than 0.010% and the balance being Fe and inevitable inclusions. According to the method, production of TRIP780 and QP980 steel type and strength level products is completed through process control by using one component. The method provided by the invention is is suitable for industrial production, easy in process control and capable of reducing cost and increasing efficiency for enterprises.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled high-strength steel production and manufacturing, and relates to a dual-purpose cold-rolled high-strength steel based on a carbon distribution process and a manufacturing method thereof. Background technique [0002] With the increasing requirements of the automobile market for energy saving, environmental protection, safety, and comfort, the lightweight of automobile bodies has become an important trend in the development of automobile technology today, and the use of high-strength steel materials is currently one of the most economical and effective lightweight methods. Phase change induction Plasticity (TRIP) steel has been widely used in car body manufacturing and has played a very important role in the lightweight of automobiles. The characteristic products of the third-generation advanced high-strength steel represented by quenched partition (QP) steel are characterized by their excellent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D6/00C21D8/02C21D9/00C22C38/02C22C38/06C22C38/26C22C38/28C22C38/32C22C38/34C22C38/38
CPCC21D1/26C21D6/002C21D6/005C21D6/008C21D8/0221C21D9/0081C21D2211/001C21D2211/005C22C38/002C22C38/02C22C38/06C22C38/26C22C38/28C22C38/32C22C38/34C22C38/38
Inventor 王亚东韩丹王立刚杨天一陈虹宇
Owner BENGANG STEEL PLATES
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