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High-strength hot-rolled steel sheet and manufacturing process therefor

A technology of hot-rolled steel plate and manufacturing method, which is applied in the field of high-strength hot-rolled steel plate and its manufacturing, and can solve the problems of ductility, extension flangeability deterioration, etc.

Inactive Publication Date: 2015-10-21
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when TiC is integrated and precipitated in the matrix of the parent phase, the ductility and stretch-flangeability deteriorate

Method used

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  • High-strength hot-rolled steel sheet and manufacturing process therefor
  • High-strength hot-rolled steel sheet and manufacturing process therefor
  • High-strength hot-rolled steel sheet and manufacturing process therefor

Examples

Experimental program
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Effect test

Embodiment

[0130] will have the composition shown in Table 1 and Ar 3 Steel slabs (No.A to Q) at the transformation point were heated to 1200 to 1290°C, and hot rolled steel sheets (No.1 to 23) were produced under the hot rolling conditions shown in Table 2. The plate thickness is 2.0-4.0mm. It should be noted that Ar in Table 1 3 The phase transition point was obtained by the method described above. For some hot-rolled steel sheets (No. 3, 4, 9-11, 16, 18, 19), after pickling, they are passed through the hot-dip galvanizing line, thus, at the soaking temperature shown in Table 2 An annealing treatment is performed, and a hot-dip galvanizing treatment is further performed. It should be noted that the hot-dip galvanizing treatment is the following treatment: the hot-rolled steel sheet after the annealing treatment is immersed in a galvanizing bath (0.1 mass% Al-Zn) at 480° C., and each side is formed on both surfaces of the steel sheet. The amount is 45g / m 2 Hot-dip galvanizing layer...

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Abstract

Provided are a high-strength hot-rolled steel sheet with excellent burring workability and a manufacturing process therefor. This high-strength hot-rolled steel sheet with excellent burring workability has: a composition that contains, in mass%, 0.03 to 0.1% of C, less than 0.5% of Si, more than 0.7 to less than 1.2% of Mn, up to 0.05% of P, up to 0.005% of S, up to 0.01% of N, up to 0.1% of Al, and 0.1 to 0.25% of Ti so as to satisfy the relationships Ti*≥0.1 and C×(48 / 12)-0.14<Ti*<C×(48 / 12)+0.08 [wherein Ti*=Ti-N×(48 / 14)-S×(48 / 32), and C, S, N and Ti are contents (mass%) of these elements respectively], with the balance consisting of Fe and unavoidable impurities; and a structure that has a ferrite fraction exceeding 90% and that contains Ti-containing carbide precipitates, at least 70% of which have particle diameters of less than 9nm.

Description

technical field [0001] The present invention relates to a high-strength hot-rolled steel sheet excellent in deburring formability and a method for producing the same. The high-strength hot-rolled steel sheet of the present invention is mainly used for automotive body components, such as structural parts such as body members and frames, and driving components such as suspensions (suspensions). chassis parts). However, it is not limited to these uses. Background technique [0002] In recent years, in order to achieve weight saving of automobile bodies (automotive bodies), high-strength steel sheets have been actively used as raw materials for automobile parts. Utilization of high-strength steel plates as structural parts of automobiles has become widespread. In addition, in order to further reduce the weight of automobile bodies, it is strongly desired to apply high-strength steel sheets not only to frame members, but also to running members, which generally use hot-rolled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/54C23C2/02C23C2/06C23C2/28
CPCC21D9/46C22C38/00C22C38/001C22C38/02C22C38/04C22C38/06C22C38/14C22C38/54C23C2/02C23C2/06C23C2/28C23C2/40C21D8/0426C21D8/0463C21D2211/004C21D2211/005C22C38/002C22C38/005C22C38/08C22C38/12C22C38/22C22C38/28Y02P10/20C23C2/024C23C2/0224
Inventor 中岛胜己山崎和彦上力
Owner JFE STEEL CORP
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