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High-strength hot-rolled steel sheet and production method thereof

A kind of hot-rolled steel sheet and technology of manufacturing method, applied in the field of high-strength hot-rolled steel sheet and its manufacture

Active Publication Date: 2015-10-07
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the prior art, the actual situation is that there is no high-strength hot-rolled steel sheet with sufficient workability that can be applied to parts that are formed by strict deburring processing such as automobile running parts, and high-strength hot-rolled steel sheets with excellent workability are desired. rolled steel

Method used

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  • High-strength hot-rolled steel sheet and production method thereof
  • High-strength hot-rolled steel sheet and production method thereof
  • High-strength hot-rolled steel sheet and production method thereof

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Embodiment

[0127] will have the composition shown in Table 1 and Ar 3 Steel slabs (No.A to P) at the transformation point were heated to 1200 to 1290°C, and hot rolled steel sheets (No.1 to 22) were produced under the hot rolling conditions shown in Table 2. The plate thickness is 1.2 to 3.2 mm. 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, 10, 14, 16, 18-20), after pickling, they are passed through the hot-dip galvanizing production line, thus, in the soaking shown in Table 2 Annealing treatment is carried out at high temperature, and hot-dip galvanizing treatment is further carried out. 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...

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Abstract

A high-strength hot-rolled steel sheet with excellent burring workability, and a production method thereof are provided. This high-strength hot-rolled steel sheet with excellent burring workability has a composition which includes, in mass%, C: 0.06%-0.13%, Si: less than 0.5%, Mn: greater than 0.5% and less than or equal to 1.4%, P: 0.05% or less, S: 0.005% or less, N: 0.01% or less, Al: 0.1% or less, Ti: 0.05%-0.25% and V: greater than 0.15% and less than or equal to 0.4%, such that S, N, Ti and V satisfy Ti* + V ≧ 0.35 (here, Ti*=Ti-N×(48 / 14)-S×(48 / 32), and S, N, Ti and V represent the content (in mass%) of each element), with the remainder consisting of Fe and unavoidable impurities, and is of a material in which the ferrite phase fraction exceeds 90%, carbides containing Ti are precipitated, and 70% or more of said carbides have a particle diameter 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
CPCC21D8/0226C21D9/46C21D2211/004C21D2211/005C22C38/00C22C38/02C22C38/14C22C38/54C23C2/02C23C2/06C23C2/28C23C2/40Y02W30/54Y02P10/20C23C2/024C23C2/0224C22C38/001C22C38/002C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/24C22C38/28
Inventor 中岛胜己山崎和彦上力
Owner JFE STEEL CORP
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