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High-plasticity 780MPa-level cold rolled dual-phase steel and preparation method thereof

A dual-phase steel, high plasticity technology, applied in the direction of metal rolling, metal rolling, rolling mill control devices, etc., can solve unrealistic problems, achieve excellent welding performance, less demanding production equipment, and good formability

Inactive Publication Date: 2011-10-12
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not realistic for the high-speed jet cooling continuous annealing production line commonly used at present.

Method used

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  • High-plasticity 780MPa-level cold rolled dual-phase steel and preparation method thereof
  • High-plasticity 780MPa-level cold rolled dual-phase steel and preparation method thereof
  • High-plasticity 780MPa-level cold rolled dual-phase steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0068] A test steel chemical composition as shown in Table 1

[0069] Table 1 The chemical composition (Wt%) of trial production steel of the present invention

[0070] C

Si

mn

P

S

Alt

N

Fe

0.07

1.2

2.2

0.008

0.005

0.06

0.005

margin

[0071] B. Heating temperature of hot rolling slab: 1270°C; finishing temperature of hot rolling: 910°C; coiling temperature of hot rolling 690°C. The thickness of the hot-rolled sheet is 4.0mm.

[0072] C. The thickness of the cold-rolled sheet is 1.8mm.

[0073] D. Continuous annealing process parameter control as shown in Table 2

[0074] The continuous annealing temperature parameter that table 2 present invention adopts

[0075] warm up

heating

Soaking

slow cooling

fast cooling

Overdue

250℃

820℃

820℃

650℃

260℃

260℃

[0076] E. Flat elongation is controlled at 0.5%.

[0077] The pe...

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Abstract

The invention discloses a high-plasticity 780MPa-level cold rolled dual-phase steel and a preparation method thereof. The steel comprises the following chemical components in percentage by weight: 0.06 to 0.08 percent of C, 1.0 to 1.3 percent of Si, 2.1 to 2.3 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 0.02 to 0.07 percent of Alt, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities. According to the hot rolling process parameters, the heating temperature of a continuously cast bloom is 1,250+ / -30 DEG C, the final rolling temperature is 890+ / -30 DEG C, the coiling temperature is 670+ / -30 DEG C, the cold rolling press-down rate is 50 to 70 percent, and the continuous annealing process is controlled. The invention has the advantages that: the C equivalent weight of the steel is effectively reduced by regulating the components of the alloy based on a conventional gas jet cooling and continuous annealing mode, the elongation of the steel is improved, and considerable economic benefit can be brought.

Description

technical field [0001] The invention provides a high-plasticity 780MPa grade cold-rolled dual-phase steel and a preparation method thereof, which belong to the technical field of cold-rolled high-strength steel plates for automobiles, and are especially used for anti-collision parts and reinforcement parts for automobiles. Background technique [0002] Reducing fuel consumption and improving body safety are the development trends of the automobile industry. Reducing the weight of a car is an effective way to reduce fuel consumption, which requires the use of thinner steel plates. However, the thinning of the steel plate will inevitably lead to a decrease in the safety performance of the car body. In order to alleviate this contradiction, the use of high-strength and ultra-high-strength steel plates is the only way to design the car body. [0003] Introducing hard phases into steel is an effective method for steel strengthening, and dual-phase steel is a high-strength steel ...

Claims

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Application Information

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IPC IPC(8): C22C38/06B21B37/00C21D1/26C21D11/00
Inventor 邝霜乔建军陈波刘光明朱国森刘广会吴宁宁尉冬刘再旺王海全熊爱明滕华湘
Owner SHOUGANG CORPORATION
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