A low-strength thermoformed steel coil resistant to iron sheet shedding and its preparation method

A thermoforming, low-strength technology, used in metallurgy and steel rolling, which can solve the problems of high strength and easy peeling off of surface iron.

Active Publication Date: 2022-04-26
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention provides a low-strength iron-shedding-resistant thermoformed steel coil and a preparation method thereof. The low-strength iron-shedding-resistant thermoformed steel coil prepared by the invention The steel can effectively solve the technical problem that the strength of the cold-rolled hot-formed steel is too high and the surface iron sheet is easy to fall off during stamping and forming in the prior art

Method used

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  • A low-strength thermoformed steel coil resistant to iron sheet shedding and its preparation method
  • A low-strength thermoformed steel coil resistant to iron sheet shedding and its preparation method
  • A low-strength thermoformed steel coil resistant to iron sheet shedding and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation method of the low-strength iron sheet peeling-resistant hot-formed steel coil according to the present invention comprises:

[0040] (1) After smelting and continuous casting molten iron or scrap steel, a steel slab is obtained; wherein, the steel slab contains: C0.20%, Si 0.20%, Mn 1.10%, Alt 0.02%, B 0.002%, P 0.02%, S 0.003%, N 0.005%, the balance is iron and inevitable impurities;

[0041] (2) heating the steel slab obtained in step (1), the heating temperature is 1260°C, and the heating time is 230min;

[0042] (3) rough rolling the steel slab obtained in step (2), and the rough rolling process adopts two rolling mills for rolling, wherein the "1+5" mode or "3+3" mode is used for rolling; rough rolling The thickness of the steel slab before is 237mm; the thickness of the steel slab after rough rolling is 30mm;

[0043] (4) finish rolling the strip obtained in step (3), the temperature of finish rolling is 850 ℃; the thickness of the steel slab aft...

Embodiment 2

[0054] The preparation method of the low-strength iron sheet peeling-resistant hot-formed steel coil according to the present invention comprises:

[0055] (1) After smelting and continuous casting molten iron or scrap steel, a steel slab is obtained; wherein, the steel slab contains: C0.25%, Si 0.30%, Mn 1.50%, Alt 0.06%, B 0.004%, P 0.01%, S 0.002%, N 0.003%, the balance is iron and inevitable impurities;

[0056] (2) heating the steel slab obtained in step (1), the heating temperature is 1300°C, and the heating time is 300min;

[0057] (3) rough rolling the steel slab obtained in step (2), and the rough rolling process adopts two rolling mills for rolling, wherein the "1+5" mode or "3+3" mode is used for rolling; rough rolling The thickness of the steel slab before is 237mm; the thickness of the steel slab after rough rolling is 40mm;

[0058] (4) finish rolling the strip obtained in step (3), the temperature of finish rolling is 1100 ℃; the thickness of the steel slab af...

Embodiment 3

[0069] The preparation method of the low-strength iron sheet peeling-resistant hot-formed steel coil according to the present invention comprises:

[0070] (1) After smelting and continuous casting molten iron or scrap steel, a steel slab is obtained; wherein, the steel slab contains: C0.22%, Si 0.25%, Mn 1.30%, Alt 0.035%, B 0.0025%, P 0.012%, S0.002%, N0.004%, the balance is iron and inevitable impurities;

[0071] (2) heating the steel slab obtained in step (1), the heating temperature is 1280°C, and the heating time is 300min;

[0072] (3) rough rolling the steel slab obtained in step (2), and the rough rolling process adopts two rolling mills for rolling, wherein the "1+5" mode or "3+3" mode is used for rolling; rough rolling The thickness of the steel slab before is 237mm; the thickness of the steel slab after rough rolling is 35mm;

[0073] (4) finish rolling the strip obtained in step (3), the temperature of finish rolling is 1100 ℃; the thickness of the steel slab a...

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Abstract

The invention belongs to the field of metallurgy and steel rolling, and in particular relates to a low-strength hot-formed steel coil resistant to iron sheet shedding, which comprises: C 0.20-0.25%, Si 0.20-0.30%, Mn 1.10-1.50%, Alt 0.02-0.06%, B 0.002~0.004%, P≤0.02%, S≤0.003%, N≤0.005%, the balance is iron and unavoidable impurities. The preparation method comprises the following steps: smelting and continuous casting to obtain steel slabs, sequentially heating, hot rolling, cooling and cold rolling the steel slabs to obtain steel strips; sequentially cleaning and oiling the steel strips , coiling to obtain the low-strength hot-formed steel coil steel coil that is resistant to iron sheet shedding; the cooling method is rear laminar cooling; the roughness of the roll used in the rolling process is 6.0-6.5 μm ; The surface roughness of the steel strip obtained after the cold rolling is 0.8-1.5 μm. The product and the preparation method of the invention can effectively solve the technical problem that the iron sheet on the surface is easy to fall off during stamping and forming because the strength of the cold-rolled hot-formed steel is too high.

Description

technical field [0001] The invention belongs to the field of metallurgy and steel rolling, and in particular relates to a method for preparing a low-strength heat-formed steel coil resistant to falling off of iron sheets and a product thereof. Background technique [0002] An important way to realize the lightweight of automobiles is to apply a large number of high-strength and ultra-high-strength steel plates in auto parts. However, as the strength of the steel plate increases, its stamping performance declines rapidly. Those high-strength and ultra-high-strength steel plates are prone to cracking and severe springback when stamping at room temperature, and the stamping of complex-shaped parts is especially difficult. [0003] The use of hot-formed steel plates is an effective way to solve the above problems. It can not only effectively reduce the weight of the vehicle body, reduce fuel consumption, but also improve the safety and comfort of the vehicle. [0004] Hot-forme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02C21D1/74C21D1/18
CPCC22C38/02C22C38/04C22C38/06C22C38/002C21D8/0226C21D8/0263C21D8/0236C21D1/74C21D1/18C21D2211/008C21D2211/002
Inventor 李润昌周纪名张环宇罗新龙范红妹徐德超夏银锋巫雪松
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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