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High-strength cold-rolled steel plate having excellent deep drawability and in-coil material uniformity, and method for manufacturing same

一种冷轧钢板、制造方法的技术，应用在制造工具、金属轧制、炉等方向，达到操作性提高、卷材内材质均匀性良好的效果

Active Publication Date: 2014-06-11
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this technology, the target steel plate is a ferritic single-phase steel based on ultra-low carbon steel IF steel (Interstitial free steel, interstitial free steel), and high-strength steel with a tensile strength of 440 MPa or more steel plate is not mentioned at all

Method used

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  • High-strength cold-rolled steel plate having excellent deep drawability and in-coil material uniformity, and method for manufacturing same
  • High-strength cold-rolled steel plate having excellent deep drawability and in-coil material uniformity, and method for manufacturing same
  • High-strength cold-rolled steel plate having excellent deep drawability and in-coil material uniformity, and method for manufacturing same

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Effect test

Embodiment 1

[0148] Hereinafter, the present invention will be further described by way of examples.

[0149] Molten steel having the composition shown in Table 1 was melted in a converter and formed into slabs by continuous casting. These steel slabs were heated to 1220° C., hot-rolled, and coiled to form a hot-rolled sheet having a thickness of 4.0 mm. In addition, the rolling temperature and rolling ratio of the final pass and the pass preceding the final pass of the above-mentioned hot rolling, the average cooling rate from the beginning of cooling to 720°C after the finish rolling, and the coiling temperature are shown in the table. 2. In addition, the time from the end of finish rolling to the start of cooling was within 3 seconds.

[0150] Next, the hot-rolled steel sheets obtained above were pickled, and then cold-rolled under the conditions shown in Table 2 to form cold-rolled steel sheets with a thickness of 1.2 mm. Next, continuous annealing was performed under the conditions...

Embodiment 2

[0167] Steels having the chemical compositions of steels D, G, and L shown in Table 1 were melted in a converter, and formed into steel slabs by continuous casting. These steel slabs were heated to 1220° C., hot-rolled, and coiled to form a hot-rolled sheet having a thickness of 4.0 mm. In addition, the rolling temperature and rolling ratio of the final pass and the pass preceding the final pass during the finishing rolling of the above-mentioned hot rolling, and the average cooling rate and coiling temperature from the beginning of cooling to 720°C after finishing rolling are shown in the table 4. In addition, the time from the end of finish rolling to the start of cooling was within 3 seconds.

[0168] Next, the obtained hot-rolled steel sheets were pickled and then cold-rolled under the conditions shown in Table 4 to form cold-rolled steel sheets with a thickness of 1.2 mm. Next, continuous annealing was performed under the conditions described in Table 4, and skin pass r...

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Abstract

Proposed are a high-strength cold-rolled steel plate having an excellent deep drawability and in-coil material uniformity, and a method for manufacturing same. The component composition is as follows, in weight%: C: 0.010 to 0.060%, Si: more than 0.5 to 1.5%, Mn: 1.0 to 3.0%, P: 0.005 to 0.100%, S: 0.010% or less, sol.Al: 0.005 to 0.500%, N: 0.0100% or less, Nb: 0.010 to 0.100%, and Ti: 0.015 to 0.150%, wherein (Nb / 93) / (C / 12) < 0.20, 0.005 <= C* <= 0.025, and (Nb / 93 + Ti* / 48) / (C / 12) >= 0.150 (where C* = C - (12 / 93)Nb - (12 / 48)Ti*, Ti* = Ti - (48 / 14)N - (48 / 32)S) are satisfied; and the remainder is iron and unavoidable impurities. The structure has a ferrite phase representing no less than 70% in area ratio, and a martensite phase representing no less than 3% in area ratio. The tensile strength is no less than 440 MPa and the average r value is no less than 1.20.

Description

technical field [0001] The present invention relates to a high-strength cold-rolled steel sheet suitable for use in inner and outer panels of automobile bodies, etc., which is excellent in deep drawability and material uniformity in a coil, and a manufacturing method thereof. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, in order to limit CO 2 emissions, calls for improved vehicle fuel efficiency. In addition, in order to ensure the safety of occupants in the event of a vehicle collision, it is also required to improve the safety centering on the collision characteristics of the vehicle body. In addition, in response to such demands, weight reduction and strengthening of automobile bodies are being actively promoted. [0003] In order to satisfy both the weight reduction and reinforcement of the automobile body, it is effective to achieve weight reduction by increasing the strength of raw materials and thinning the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21B1/26B21B3/00C21D9/48C22C38/14C22C38/60
CPCC21D2211/008C22C38/14C22C38/04C22C38/008C21D8/0236C22C38/001C21D8/0263C22C38/22C22C38/02C22C38/12C22C38/60C22C38/00C22C38/26C22C38/06B21B1/26C22C38/28C21D8/0463B21B3/00C22C38/16C21D2211/005C22C38/08C21D8/0405C21D9/48C22C38/24C21D8/0436
Inventor 木村英之长泷康伸奥田金晴河村健二
Owner JFE STEEL CORP
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