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Deep drawing dual-phase steel and production method thereof

A dual-phase steel and deep-drawing technology, applied in the field of deep-drawing forming steel, can solve the problems of poor deep-drawing performance of dual-phase steel, high investment cost, difficult to meet the production of cover parts, etc., and achieve the effect of good deep-drawing.

Active Publication Date: 2016-06-29
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the deep drawing performance of dual-phase steel is poor, and its plastic strain ratio (r value) is generally less than 1.0, which is difficult to meet the production of passenger car outer panels and panels with high stamping performance requirements
According to the Japanese patent, adding bell pre-annealing process before critical zone annealing can improve the deep drawing performance of dual-phase steel, but the investment cost is high

Method used

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  • Deep drawing dual-phase steel and production method thereof
  • Deep drawing dual-phase steel and production method thereof
  • Deep drawing dual-phase steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A deep drawing dual-phase steel provided in this example has the following chemical composition weight percentages: C: 0.024%, Si: 0.3%, Mn: 1.8%, P: 0.046%, S: 0.004%, Alt: 0.04% , N: 0.004%, Nb: 0.072%, and the balance is Fe and trace elements.

[0046] A method for producing the above-mentioned deep drawing dual-phase steel provided in this embodiment includes the following steps:

[0047] Step A1: Continuous casting of molten steel to obtain a slab; during the smelting process, the end point temperature of the converter is 1730°C, 400kg of alloy ferrophosphorus, 120kg of medium carbon ferromanganese, 600kg of slag lime, and 200kg of fluorite are added during the tapping process; Add 250kg of aluminum particles, 1300kg of ferrosilicon, 4000kg of manganese metal, 120kg of ferrophosphorus and 295kg of ferroniobium during the RH refining process. When the smelting is completed, the weight percentages of the chemical components are: C: 0.024%, Si: 0.4%, Mn: 1.75%, P: 0....

Embodiment 2

[0067] The difference between this example and Example 1 is that the deep drawing dual-phase steel provided in this example has the following chemical composition weight percentages: C: 0.018%, Si: 0.2%, Mn: 1.6%, P: 0.056%, S: 0.004%, Alt: 0.025%, N: 0.004%, Nb: 0.082%, and the balance is Fe and trace elements.

[0068] A method for producing the above-mentioned deep drawing dual-phase steel provided in this embodiment includes the following steps:

[0069] Step A1: The molten steel is continuously cast after smelting to obtain a slab; during the smelting process, the end point temperature of the converter is 1715°C, and 400kg of alloy ferrophosphorus, 140kg of micro-carbon ferromanganese, 300kg of slag lime, and 400kg of pre-melted slag are added during the tapping process; Then add 250kg of aluminum particles, 625kg of ferrosilicon, 3750kg of manganese metal, 50kg of ferrophosphorus, and 285kg of ferroniobium into the RH refining process. When the smelting is completed, th...

Embodiment 3

[0084] The difference between this example and Example 1 is that the deep drawing dual-phase steel provided in this example has the following chemical composition weight percentages: C: 0.025%, Si: 0.5%, Mn: 1.9%, P: 0.08%, S: 0.008%, Alt: 0.07%, N: 0.0014%, Nb: 0.1%, and the balance is Fe and trace elements.

[0085] A method for producing the above-mentioned deep drawing dual-phase steel provided in this embodiment includes the following steps:

[0086] Step A1: Continuous casting of molten steel to obtain a slab; during the smelting process, the end point temperature of the converter is 1740°C, and 450kg of alloy ferrophosphorus, 150kg of micro-carbon ferromanganese, 800kg of slag lime, and 200kg of fluorite are added during the tapping process; Add 350Kg of aluminum particles, 1560kg of ferrosilicon, 4450kg of metal manganese, 180kg of ferrophosphorus, and 345kg of ferroniobium during the RH refining process. When the smelting is completed, the weight percentages of the c...

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Abstract

The invention discloses deep-stamping dual-phase steel. The deep-stamping dual-phase steel comprises the following chemical components in percentage by mass: 0.018%%-0.025% of C, 0.2%-0.5% of Si, 1.6%-1.9% of Mn, 0.07%-0.1% of Nb, 0.05%-0.08% of P, less than or equal to 0.004% of S, 0.02%-0.07% of Alt, less than or equal to 0.004% of N and the balance of Fe and trace elements, wherein the content ratio of the Nb element to the C element is in the range of (Nb / 93) / (C / 12) being equal to 0.2-0.7. The invention also discloses a deep-stamping dual-phase steel production method. According to the deep-stamping dual-phase steel and the production method provided by the invention, the deep-stamping dual-phase steel with a high plastic strain ratio r can be obtained, so that the deep-stamping dual-phase steel has good deep-stamping performance under high tensile strength.

Description

technical field [0001] The invention relates to the technical field of deep drawing formed steel, in particular to a deep drawing dual-phase steel and a production method thereof. Background technique [0002] Nowadays, it is the development trend of the automobile industry to reduce the fuel cost and improve the safety of the vehicle body. Reducing the vehicle's own weight is an effective way to reduce fuel costs, which requires the use of thinner steel plates. However, the thinning of steel will inevitably lead to the reduction of the safety performance of the automobile body. In order to alleviate such contradictions, more and more automobile factories favor the use of high-strength and ultra-high-strength steel. Since most high-strength steel sheets for automobiles need to be stamped to form auto parts, this requires high-strength steel sheets for automobiles to have better deep drawability. Dual-phase steel (DualPhaseSteel, referred to as DP) is one of the high-streng...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C33/04C21D8/04
Inventor 姜英花尉冬王海全熊爱明刘光明
Owner SHOUGANG CORPORATION
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