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Deep-drawn-grade Ti-IF cold-rolled steel plate and preparation method thereof

A technology of cold-rolled steel sheet and deep-drawing grade, which is applied in the field of deep-drawing Ti-IF cold-rolled steel sheet and its preparation, can solve the problems of influence, unfavorable steel sheet performance, residual stress of steel sheet, etc., and achieve low yield ratio, good The effect of high plasticity and plastic strain ratio

Inactive Publication Date: 2017-06-13
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the steel plate is cold-rolled, it will produce different degrees of work hardening, resulting in residual stress inside the steel plate, which will adversely affect the performance of the steel plate

Method used

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  • Deep-drawn-grade Ti-IF cold-rolled steel plate and preparation method thereof
  • Deep-drawn-grade Ti-IF cold-rolled steel plate and preparation method thereof
  • Deep-drawn-grade Ti-IF cold-rolled steel plate and preparation method thereof

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preparation example Construction

[0028] The preparation method of deep-drawing grade Ti-IF cold-rolled steel plate specifically comprises the following steps:

[0029] Step 1: smelting and continuous casting;

[0030] Hot metal pretreatment, converter smelting, RH furnace refining, casting machine continuous casting. Steelmaking process control [O] ≤ 20ppm, [N] ≤ 30ppm, molten steel composition for casting machine is C: 0.001-0.003%, Si: 0.004-0.006%, Mn: 0.14-0.16, P: ≤ 0.010%, S ≤ 0.006%, Ti: 0.055-0.075%.

[0031] Step 2: Slab heating;

[0032] The heating process is strictly controlled within the furnace time, and the furnace temperature is 1210±15°C.

[0033] Step 3: Rolling;

[0034] Including rough rolling and finishing rolling, rough rolling adopts 2-stand rolling mill for rough rolling, and finish rolling adopts 7-stand continuous variable crown (Continuously variable crown, cvc) rolling mill for finishing rolling. The start rolling temperature of finish rolling is 1050±15°C, and the finish roll...

Embodiment 1

[0042]The molten iron is subjected to desulfurization pretreatment, and the top-bottom combined blowing converter is used to smelt the molten iron to decarburize and dephosphorize the molten steel to obtain molten steel, and the scrap steel is added to the converter. Then the molten steel after converter smelting is subjected to RH operation, and the in-situ temperature is 1630-1660°C, and deep decarburization treatment is carried out, the target is 20ppm. After the decarburization is completed, aluminum particles are added for deoxidation according to the fixed oxygen situation, and alloys such as titanium and iron are added to adjust the composition. , to ensure [O] in molten steel ≤ 20ppm. Smelting according to the chemical composition shown in Table 1, the superheat of slab continuous casting is 25°C, and the continuous casting process should use carbon-free tundish covering agent to avoid carbon increase in the casting process. After that, slab cleaning, slow cooling, and...

Embodiment 2

[0044] The molten iron is subjected to desulfurization pretreatment, and the top-bottom combined blowing converter is used to smelt the molten iron to decarburize and dephosphorize the molten steel to obtain molten steel, and the scrap steel is added to the converter. Then the molten steel after converter smelting is subjected to RH operation, and the in-situ temperature is 1630-1660°C, and deep decarburization treatment is carried out, the target is 20ppm. After the decarburization is completed, aluminum particles are added for deoxidation according to the fixed oxygen situation, and alloys such as titanium and iron are added to adjust the composition. , to ensure [O] in molten steel ≤ 20ppm. Smelting according to the chemical composition shown in Table 1, the superheat of slab continuous casting is 25°C, and the continuous casting process should use carbon-free tundish covering agent to avoid carbon increase in the casting process. After that, slab cleaning, slow cooling, an...

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Abstract

The invention discloses a deep-drawn-grade Ti-IF cold-rolled steel plate. The cold-rolled steel plate comprises the following chemical components in percentage by mass: 0.001-0.003% of C, 0.004-0.006% of Si, 0.14-0.16% of Mn, P not more than 0.010%, S not more than 0.006%, and 0.055-0.075% of Ti. The invention further discloses a preparation method of the deep-drawn-grade Ti-IF cold-rolled steel plate. A steel strip prepared by the deep-drawn-grade Ti-IF cold-rolled steel plate has such performances as low yield ratio, excellent plasticity, high plastic strain ratio and excellent punching formation, and is suitable for the demands of such complex forming modes as the punching process.

Description

technical field [0001] The invention relates to a production technology of IF steel, in particular to a deep-drawing grade Ti-IF cold-rolled steel plate and a preparation method thereof. Background technique [0002] IF is the abbreviation of Interstitial Free, so IF steel is also called "interstitial atom-free steel". Since there are no interstitial solid solution C and N atoms in the steel, the steel has excellent deep drawing performance and non-aging performance. The composition of IF steel is characterized by ultra-low carbon, microalloying, basically no C and N interstitial atoms, and the steel is pure. By adding Nb or Ti microalloying elements to ultra-low carbon steel, carbon and nitride precipitation are formed to achieve the purpose of no interstitial atoms. In the manufacturing process, ultra-low carbon treatment and purification treatment of molten steel in the steelmaking and continuous casting process are required to reduce the addition of microalloying elemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/14C21D8/02
CPCC22C38/02C21D8/0236C21D8/0273C22C38/04C22C38/14
Inventor 郭冬青张秀飞
Owner INNER MONGOLIA BAOTOU STEEL UNION
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