Ultrawide SEDDQ deep-drawing automobile sheet and production method thereof

An automotive sheet and wide-width technology, applied in the field of steel rolling, can solve the problems of uneven heating, deviation of furnace area, strip bending, etc., and achieve the effects of excellent mechanical performance indicators, reducing belt breakage and parking accidents, and good surface quality.

Active Publication Date: 2015-02-25
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness specifications of ultra-wide SEDDQ grade deep-drawn automotive sheets are mainly concentrated between 0.6mm and 0.9mm. This kind of steel coil with a large aspect ratio is very easy to be unreasonable due to the shape and process system under the high-temperature annealing state in the furnace. Interaction, causing strip bending and scratches, which can easily lead to strip breakage in the furnace
[0003] The ultra-wide and ultra-deep drawing SEDDQ grade is an IF steel product, which is mainly used in the outer covering parts of automobiles. The front and rear and the overall side wall, roof and other parts, this kind of IF steel with a large aspect ratio requires high production technology. In the annealing state, hot scoops caused by uneven heating in the strip steel furnace are very likely to occur, causing deviation in the furnace area, resulting in production accidents such as slowing down of the strip steel until it stops

Method used

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  • Ultrawide SEDDQ deep-drawing automobile sheet and production method thereof
  • Ultrawide SEDDQ deep-drawing automobile sheet and production method thereof
  • Ultrawide SEDDQ deep-drawing automobile sheet and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of ultra-wide SEDDQ grade deep-drawn automobile plate provided by the invention, its chemical composition weight percent is:

[0024] C: 0.0020-0.0035%; Si≤0.03%; Mn: 0.15-0.20%; P≤0.012%; S≤0.015%; For Fe and other trace elements.

[0025] C in IF steel is a solid solution strengthening element, and its contribution to the strength has a great influence. In view of the low strength of the ultra-wide SEDDQ grade deep-drawing automobile sheet, the thermal deformation resistance is low, resulting in unstable production status in the furnace, and it is necessary to avoid Excessive C content leads to deterioration of product formability. Therefore, the composition range of C is limited and strictly controlled between 0.0020-0.0035%. In the tempering machine process, the tension is optimized before and after the tempering machine and the setting of the working roll diameter of the tempering machine. Realize the small flat elongation of ultra-wide SEDDQ grade IF steel...

Embodiment 2

[0045] The difference between this example and Example 1 is that the mass percentage of the chemical composition of the slab is C: 0.0035%; Si: 0.005%; Mn: 0.20%; P: 0.002%; S: 0.0005%; Alt: 0.05% , N: 0.0010%, Ti: 0.07%, the balance is Fe and other trace elements. When heating the slab, the heating temperature was 1280°C. The finish rolling temperature of the hot-rolled sheet was 950°C. The coiling temperature was 720°C. When the hot-rolled coil is cold-rolled, the cold-rolling reduction rate is 84%. The thickness of the chilled roll is 0.8mm, and the flat elongation is 0.5%. The temperature of each section in the continuous annealing furnace is shown in Table 4:

[0046] Table four

[0047]

[0048] Other places are completely consistent with Embodiment 1.

Embodiment 3

[0050] The difference between this example and Example 1 is that the mass percentage of the chemical composition of the slab is C: 0.0030%; Si: 0.0015%; Mn: 0.18%; P: 0.0002%; S: 0.0105%; Alt: 0.04% , N: 0.00010%, Ti: 0.06%, the balance is Fe and other trace elements. When heating the slab, the heating temperature was 1260°C. The finish rolling temperature of the hot-rolled sheet was 940°C. The coiling temperature was 740°C. When the hot-rolled coil is cold-rolled, the cold-rolling reduction rate is 83%. The thickness of the chilled roll is 1.0 mm, and the flat elongation is 0.6%. The temperature of each section in the continuous annealing furnace is shown in Table 5:

[0051] Table five

[0052] Preheating section

[0053] （℃）

[0054] Other places are completely consistent with Embodiment 1.

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Abstract

The invention discloses an ultrawide SEDDQ deep-drawing automobile sheet which comprises the following chemical components in percentage by weight: 0.0020-0.0035% of C, at most 0.03% of Si, 0.15-0.20% of Mn, at most 0.012% of P, at most 0.015% of S, 0.03-0.05% of Alt, at most 0.0040% of N, 0.05-0.07% of Ti and the balance of Fe and other microelements. The invention also discloses a method for producing the ultrawide SEDDQ deep-drawing automobile sheet. According to the invention, components, annealing temperature, leveling technique and production scheme are reasonably controlled to simultaneously ensure the excellent mechanical properties of the ultrawide SEDDQ deep-drawing automobile sheet and implement the stable sheet pass of the steel strip in the furnace, thereby greatly reducing the furnace-region broken-strip shut-down accidents caused by in-furnace cold bleaching due to the conventional technique.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to an ultra-wide SEDDQ grade deep-drawn automobile plate and a production method thereof. Background technique [0002] Ultra-wide cold-rolled sheet is an ideal material for automotive panels, and high-grade ultra-wide SEDDQ grade products not only meet the deep drawing requirements of large automotive panels, but also reduce the high cost of purchasing tailor-welded blanks. The thickness specifications of ultra-wide SEDDQ grade deep-drawing automotive sheets are mainly concentrated between 0.6mm and 0.9mm. This kind of steel coil with a large aspect ratio is very likely to be unreasonable due to the shape and process system under the high-temperature annealing state in the furnace. The interaction will cause the strip steel to bend and scratch, which will easily lead to the broken strip in the furnace. [0003] The ultra-wide and ultra-deep drawing SEDDQ grade belongs to IF ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/04
Inventor 黄学启朱国森崔阳周建于孟李亚东郭志飞李一丁杜倩
Owner SHOUGANG CORPORATION
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