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Hot-dip galvanized steel sheet and production method therefor

一种热镀锌钢板、制造方法的技术，应用在制造工具、热浸镀工艺、化学仪器和方法等方向，能够解决未提及拉伸强度高强度钢板等问题，达到材质均匀性优良、材质均匀性良好、优良耐碰撞性能的效果

Active Publication Date: 2014-10-08
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 there is no mention of a steel plate with a tensile strength of 590 MPa or more. high strength steel plate

Method used

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  • Hot-dip galvanized steel sheet and production method therefor
  • Hot-dip galvanized steel sheet and production method therefor
  • Hot-dip galvanized steel sheet and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] The molten steel containing the components shown in Table 1 was smelted in a converter, and a slab having a thickness of 230 mm was produced by a continuous casting method. After heating these billets to 1220°C, they were hot-rolled and coiled to obtain a hot-rolled sheet having a thickness of 3.5 mm. In addition, in the finish rolling of the above-mentioned hot rolling, the rolling temperature and rolling ratio of the final pass and the pass preceding the final pass, and the average cooling rate from the start of cooling after the finish rolling to a temperature range of 720° C. or lower , the coiling temperature is shown in Table 2. In addition, the time from the end of finish rolling to the start of cooling was set within 3 seconds.

[0134] Next, the hot-rolled sheet obtained above was pickled, and then cold-rolled under the conditions shown in Table 2 to prepare a cold-rolled steel sheet having a thickness of 1.4 mm. It was annealed and subjected to temper rollin...

Embodiment 2

[0149]The molten steel having the chemical compositions of steels G and P shown in Table 1 was smelted in a converter, and a slab having a thickness of 230 mm was produced by a continuous casting method. After heating these billets to 1220°C, they were hot-rolled and coiled to obtain a hot-rolled sheet having a thickness of 3.5 mm. In addition, in the finish rolling of the above-mentioned hot rolling, the rolling temperature and rolling ratio of the final pass and the pass preceding the final pass, and the average cooling rate from the start of cooling after the finish rolling to a temperature range of 720° C. or lower , the coiling temperature is shown in Table 4. In addition, the time from the end of finish rolling to the start of cooling was set within 3 seconds.

[0150] Next, the hot-rolled sheet obtained above was pickled, and then cold-rolled under the conditions shown in Table 4 to obtain a cold-rolled steel sheet having a thickness of 1.4 mm. It was annealed and sub...

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Abstract

Provided are a high-strength hot-dip galvanized steel sheet and a production method therefor, the hot-dip galvanized steel sheet maintaining a high yield ratio (YR) and a high bake hardening amount (BH amount) from the perspective of improving collision resistance performance, and having excellent material properties, in particular strength and internal uniformity of an elongated coil, at TS not less than 590 MPa. The hot-dip galvanized steel sheet has a structure that: contains, in mass%, 0.060%-0.13% C, 0.01%-0.7% Si, 1.0%-3.0% Mn, 0.005%-0.100% P, less than 0.010% S, 0.005%-0.100% sol. Al, less than 0.0100% N, 0.005%-0.10% Nb, and 0.03%-0.15% Ti; fulfills the relationship (Nb / 93+Ti* / 48) / (C / 12)>0.08 (Ti* = Ti-(48 / 14)N-(48 / 32)S); and includes ferrite having an average crystal particle diameter of less than 15 [mu]m and an area ratio of at least 80%, and martenite having an area ratio of 1%-15%.

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet excellent in crash resistance and material uniformity in a coil, and a method for producing the same, and in particular, to a technique applicable to a high-strength sheet steel suitable for use as a structural member of an automobile. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, in order to limit CO 2 In addition, in order to ensure the safety of occupants in the event of a vehicle collision, it is also strongly required to improve the safety centering on the collision characteristics of the automobile body. In order to meet these demands, it is necessary to satisfy both the weight reduction and the high strength of the automobile body, and from the viewpoint of reducing the thickness of the steel sheet, which is the material of the automobile body, and improving the crash resistance within the range where the rigi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/58C21D8/02C21D9/46C23C2/06C23C2/26
CPCC21D2211/008C22C38/22C23C2/06C22C38/14C22C38/04C22C38/58C23C2/02C22C38/24C21D9/46C22C38/001Y10T428/12799C22C38/60C22C38/06C22C38/38C21D2211/005C22C38/08C21D1/26C21D8/0263C22C38/28C22C38/008C21D8/0236C22C38/002C21D8/0273C22C38/02C21D8/0226C22C38/12C23C2/26C22C38/16B32B15/013Y10T428/12972C23C2/29C23C2/024C23C2/0224C23C2/285C22C38/00C22C38/26C22C38/30C22C38/10C25D5/36C25D5/38C25D5/50C25D3/22
Inventor 木村英之高岛克利金子真次郎
Owner JFE STEEL CORP
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