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Galvanized steel sheet and manufacturing method thereof

A technology for galvanized steel sheets and steel sheets, applied in manufacturing tools, chemical instruments and methods, and hot-dip galvanizing processes, which can solve problems such as hydrogen embrittlement resistance without consideration, and achieve reduced hydrogen intrusion, excellent low-temperature toughness, and mechanical properties excellent effect

Active Publication Date: 2021-09-17
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 manufacturing method thereof
  • Galvanized steel sheet and manufacturing method thereof
  • Galvanized steel sheet and manufacturing method thereof

Examples

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Effect test

Embodiment

[0235] Next, examples of the present invention will be described. The conditions in the examples are examples of conditions employed to confirm the practicability and effects of the present invention. The present invention is not limited to this conditional example. The present invention can adopt various conditions as long as the object of the present invention can be achieved without departing from the gist of the present invention.

[0236] Steels having the chemical compositions shown in Table 1A and Table 1B were cast to produce slabs. Table 1B shows the Ac of each steel obtained from the following relational formula 3 Point 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 scale on the surface. Then, cold rolling was performed to obtain steel sheets. The obtained steel sheets were subjected to continuous hot-dip galvanizing under the...

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Abstract

A galvanized steel sheet according to one aspect of the present invention includes a steel sheet having a predetermined chemical composition and a galvanized layer. In the above-mentioned steel plate, the steel structure in the range of 1 / 8 thickness to 3 / 8 thickness centering on 1 / 4 thickness from the surface contains ferrite: 0 to 10%, bainite: 0% by volume. -30%, tempered martensite: 50% or more, young martensite: 0-10%, retained austenite: more than 10% and less than 30%, and pearlite: 0-5%. After the galvanized steel sheet is removed from the galvanized layer, the amount of hydrogen released when the steel sheet is heated from room temperature to 200°C relative to the unit mass of the steel sheet is 0.40ppm or less, and the tensile strength is 1470MPa or more, equivalent to 24 hours of application. No cracks occurred in the U-shaped bending test at a stress of 1000 MPa.

Description

technical field [0001] The present invention relates to a galvanized steel sheet and a manufacturing method thereof. [0002] This application claims priority based on Patent Application No. 2018-088418 filed in Japan on May 1, 2018, the contents of which are incorporated herein by reference. Background technique [0003] In recent years, from the viewpoint of the reduction of greenhouse gas emissions accompanying the global warming countermeasures, the fuel efficiency of automobiles has been improved, and the application of high-strength steel sheets has been increasing in order to ensure the weight reduction and collision safety of the car body. Especially recently, the demand for an ultra-high-strength steel sheet having a tensile strength of 1470 MPa or more has been increasing. In addition, there is a demand for high-strength hot-dip galvanized steel sheets in which a hot-dip galvanized layer is applied to the surface of parts requiring rust resistance in the vehicle b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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
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