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Galvanized steel sheet and production method therefor

A technology of galvanized steel sheet and manufacturing method, applied in manufacturing tools, chemical instruments and methods, hot-dip plating process, etc., can solve the problem of not considering the characteristics of hydrogen embrittlement resistance, reduce the amount of hydrogen intrusion, excellent low temperature toughness, mechanical Excellent effect

Active Publication Date: 2020-12-04
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Patent Document 7 does not consider hydrogen embrittlement resistance

Method used

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  • Galvanized steel sheet and production method therefor
  • Galvanized steel sheet and production method therefor
  • Galvanized steel sheet and production method therefor

Examples

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Embodiment

[0235]Next, an embodiment of the present invention will be described. The conditions in the examples are examples of conditions used to confirm the feasibility and effects of the present invention. The present invention is not limited to this example of conditions. As long as the object of the present invention can be achieved without departing from the spirit of the present invention, various conditions can be adopted in the present invention.

[0236]The steel having the chemical composition shown in Table 1A and Table 1B was cast to produce a slab. Table 1B shows the Ac of each steel obtained from the following relational expression3Point and Ms point. These slabs were hot-rolled under the conditions shown in Table 2A and Table 2B to produce hot-rolled steel sheets. Then, the hot-rolled steel sheet is pickled to remove the oxide scale on the surface. Then, cold rolling was performed to obtain a steel sheet. The obtained steel sheet was subjected to continuous hot-dip galvanizing tre...

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Abstract

One embodiment of the invention discloses a galvanized steel sheet comprising a steel sheet having a prescribed chemical composition; and a galvanized layer. The steel sheet has a steel composition ina range of 1 / 8-3 / 8 thickness, centered on one fourth of thickness from the surface, and contains: 0-10 vol% of ferrite, 0-30 vol% of bainite, at least 50 vol% of tempered martensite, 0-10 vol% freshmartensite, more than 10 vol% and no more than 30 vol% residual austenite, and 0-5 vol% pearlite. The galvanized steel sheet: has, per steel plate mass, no more than 0.40 ppm hydrogen released when the steel plate is heated from room temperature to 200 DEG C after the galvanized layer is removed; has a tensile strength of at least 1,470 MPa, and does not crack in a U-bending test during which a stress equivalent to 1,000 MPa is applied for 24 hours.

Description

Technical field[0001]The invention relates to a galvanized steel sheet and a manufacturing method thereof.[0002]This application claims priority based on the patent application No. 2018-088418 filed in Japan on May 1, 2018, and the content is incorporated herein.Background technique[0003]In recent years, from the viewpoint of greenhouse gas emission restrictions accompanying global warming measures, it is required to improve the fuel efficiency of automobiles. In order to ensure the weight reduction and collision safety of the car body, the application of high-strength steel sheets is increasing. Especially recently, the demand for ultra-high-strength steel sheets with a tensile strength of 1470 MPa or more has been increasing. In addition, there is a need for a high-strength hot-dip galvanized steel sheet in which a hot-dip galvanized layer is applied to the surface of a portion that requires rust resistance in the vehicle body.[0004]When such a high-strength hot-dip galvanized ste...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D9/46C22C38/60C22C18/04
CPCC22C38/00C22C18/04C21D9/46C22C38/60C22C38/48C22C38/50C22C38/001C21D6/005B32B15/013C21D6/008C22C38/008C21D1/26C22C38/005C22C38/44C22C38/002C22C38/42C22C38/54C22C38/46C21D6/004C22C38/02C22C38/06C22C38/58C23C2/02C23C2/06C23C2/28C23C2/40C23C2/261C23C2/29C23C2/024C23C2/0224C21D2211/001C21D2211/002C21D2211/005C21D2211/008C21D2211/009
Inventor 横山卓史林邦夫中田匡浩山口裕司内田智史
Owner NIPPON STEEL CORP