Hot-dip galvanized steel sheet

一种热浸镀锌钢板、钢板的技术，应用在热浸镀工艺、热处理炉、热处理设备等方向，能够解决韧性差、钢板韧性下降等问题，达到耐氢脆性优良、高拉伸强度和屈服比的效果

Active Publication Date: 2019-01-04
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with tempered martensite and lower bainite, upper bainite is a structure with poor toughness, so steel plates with upper bainite as the main structure may have lower toughness

Method used

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  • Hot-dip galvanized steel sheet
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  • Hot-dip galvanized steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0158] Steel having the chemical composition shown in Table 1 was melted to form a slab, and the slab was hot-rolled under the hot-rolling conditions shown in Table 2 to form a hot-rolled steel sheet with a thickness of 3 mm. After pickling this hot-rolled steel sheet, it cold-rolled under the cold-rolling conditions (reduction ratio) shown in Table 2, and it produced the cold-rolled steel sheet of thickness 1.2mm. The empty column in Table 1 indicates that the content of this element is lower than the detection limit, and the rest is Fe and impurities. Underlines in Table 1 indicate that the values ​​are outside the scope of the present invention.

[0159]

[0160] Table 2

[0161]

[0162] R1: the total reduction rate from below 1050°C to the final pass

[0163] R2: The reduction rate of the final pass

[0164] FT: temperature of the final pass

[0165] Δt: Elapsed time from the end of finishing rolling to the beginning of cooling

[0166] For the obtained cold-roll...

Embodiment 2

[0190] Some of the steel sheets with the chemical compositions shown in Table 1 were hot-rolled under the hot-rolling conditions shown in Table 6 to obtain hot-rolled steel sheets with a thickness of 3 mm. After pickling the hot-rolled steel sheets, cold rolling was performed under the cold-rolling conditions (reduction ratio) shown in Table 6 to obtain cold-rolled steel sheets with a thickness of 1.2 mm.

[0191] Table 6

[0192]

[0193] R1: the total reduction rate from below 1050°C to the final pass

[0194] R2: The reduction rate of the final pass

[0195] FT: temperature of the final pass

[0196] Δt: Elapsed time from the end of finishing rolling to the beginning of cooling

[0197] For the obtained cold-rolled steel plate in figure 2 and heat treatment under the heat treatment conditions shown in Table 7, and then in figure 2 Hot-dip galvanizing was performed under the coating conditions shown in Table 7. Furthermore, in figure 2 Under the conditions shown...

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Abstract

This hot-dip galvanized steel sheet has a specific chemical composition and a steel structure that is represented as: containing, in terms of area ratio, polygonal ferrite in an amount not more than 10%, upper bainite in an amount not more than 20%, residual austenite in an amount not more than 5%, and martensite in an amount not less than 70%; and a martensite that includes Fe carbides at a number density not less than 1*106 / mm2, that is contained in an amount not less than 50% of the entire amount of martensite, and that has an average effective crystal grain size of not more than 5.0 [mu]m.

Description

technical field [0001] The present invention relates to a high-yield and ultra-high-strength hot-dip galvanized steel sheet excellent in hydrogen embrittlement resistance. Specifically, it mainly relates to a high-yield and ultra-high-strength hot-dip galvanized steel sheet for automobiles that is formed into various shapes by press working or the like and has excellent formability and excellent hydrogen embrittlement resistance. Background technique [0002] In recent years, reduction in fuel consumption of automobiles has been demanded from the viewpoint of limiting the emission of greenhouse gases as a measure against global warming. Therefore, in order to reduce the weight of the vehicle body and ensure crash safety, the application of high-strength steel sheets is expanding. In addition, hot-dip galvanized ultra-high-strength steel sheets are required for parts requiring rust resistance. [0003] Especially recently, the demand for ultra-high-strength steel sheets wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/58C23C2/06
CPCC21D9/46C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/28C22C38/32C23C2/06C21D2211/004C21D2211/008C22C38/001C22C38/002C22C38/005C22C38/06C23C2/02C23C2/024C23C2/26C23C2/0224C22C38/34C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C22C38/00C22C38/18C22C38/40C22C38/24C22C38/38C22C38/22C22C38/20C22C38/26C23C30/005C23C2/40C23C30/00C23C2/34B32B15/00B32B15/04Y10T428/12951Y10T428/26B32B15/043Y10T428/12799B32B15/013Y10T428/12958Y10T428/12972B32B15/01B32B15/18
Inventor 横山卓史林邦夫东昌史樱田荣作川田裕之虻川玄纪
Owner NIPPON STEEL CORP
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