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High-strength plated steel sheet and method for producing same

A manufacturing method and high-strength technology, applied in the direction of manufacturing tools, chemical instruments and methods, hot-dip galvanizing process, etc., can solve the problems of poor wettability and non-plating of hot-dip galvanizing

Inactive Publication Date: 2017-08-29
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Si and Mn are easily oxidizable elements, and the wettability of hot-dip galvanizing is significantly deteriorated due to Si oxide, Mn oxide, and composite oxide film having a composite oxide of Si and Mn formed on the surface. Problems such as non-plating occur

Method used

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  • High-strength plated steel sheet and method for producing same
  • High-strength plated steel sheet and method for producing same
  • High-strength plated steel sheet and method for producing same

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Embodiment

[0266] Hereinafter, the present invention will be described in more detail by enumerating the examples, but the present invention is not limited by the following examples, and of course it can also be implemented in a range that can meet the stated and hereinafter-described gist, and these are also included in within the technical scope of the present invention.

[0267] A slab containing the ingredients shown in Table 1 below and the balance being iron and unavoidable impurities was heated to 1250°C and hot rolled to 2.4mm at a finish rolling temperature of 900°C, as shown in Tables 2 to 4. Coiled at a temperature of 100°C to produce a hot-rolled steel sheet. In addition, for Nos. 24 to 32, 37, 39, and 41 shown in Table 3 below, and Nos. 43, 45, 47 to 49, and 52 shown in Table 4 below, the coiled hot-rolled steel sheets were placed into the ceramic fiber insulation device for insulation. The following Table 3 and Table 4 show the time when the temperature was kept at 500° C...

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Abstract

Provided are a hot-dip galvanized steel sheet and an alloyed hot-dip galvanized steel sheet having a tensile strength of at least 980 MPa, having excellent plating properties, and having excellent workability in terms of extensibility, bendability and hole expandability, and delayed fracture resistance. Disclosed is a high-strength plated steel sheet that is a plated steel sheet having a hot-dip galvanized layer or an alloyed hot-dip galvanized layer on the surface of a base material steel sheet, and that comprises, in order from the interface between the base material steel sheet and the galvanized layer toward the base material steel sheet side: an inner oxide layer including at least one type of oxide selected from the group consisting of Si and Mn; a soft layer that is a layer including said inner oxide layer, and that has a Vickers hardness which is 90% or less of the Vickers hardness at a t / 4 position of the base material steel sheet, where t is the thickness of the base material steel sheet; and a hard layer constituted by a structure including, with respect to the entire metallographic structure, from 20 to 85% by area of a low-temperature transformation-forming phase, greater than 10% and less than or equal to 70% by area of polygonal ferrite, and greater than or equal to 5% by volume of retained austenite. The average depth D of the soft layer is 20 mu m or greater, the average depth d of the inner oxide layer is 4 mu m or greater and less than D, and the tensile strength is 980 MPa or greater.

Description

Technical field [0001] The present invention relates to a high-strength plated steel plate with a tensile strength of 980 MPa or more, good plating properties, excellent processability including elongation, bending and hole expandability, and delayed fracture resistance, and further relates to a manufacturing method thereof. The plated steel sheet of the present invention includes both a hot-dip galvanized steel sheet and an alloyed hot-dip galvanized steel sheet. Background technique [0002] Hot-dip galvanized steel sheets and alloyed hot-dip galvanized steel sheets commonly used in fields such as automobiles and transport aircrafts are required not only to have high strength, but also to have elongation, bendability, and hole expandability (the same as stretch flangeability). (meaning) has excellent processability and is further required to have excellent delayed fracture resistance. [0003] In order to ensure high strength and workability, it is effective to add a larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/60
CPCC21D8/0226C21D8/0236C22C38/02C22C38/04C22C38/06C23C2/06C23C2/40C21D2211/008C21D2211/001C21D2211/002C23C2/0224C23C2/026C23C2/024C21D1/74C21D8/0247C22C38/002C22C38/005C22C38/08C22C38/12C22C38/14C22C38/16C22C38/38B32B15/013C21D9/46C22C38/001C23C2/261C23C2/29C22C38/60C21D8/0263
Inventor 二村裕一池田宗朗中屋道治
Owner KOBE STEEL LTD
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