High-strength zinc-plated steel sheet and high-strength steel sheet having superior moldability, and method for producing each

A high-strength steel plate and manufacturing method technology, applied in the direction of manufacturing tools, chemical instruments and methods, metal rolling, etc., can solve the problems of insufficient formability and processing difficulties, and achieve the effect of excellent formability

Active Publication Date: 2014-04-09
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in recent years, with the rapid increase in strength of high-strength steel sheets, the formability of high-strength steel sheets with a maximum tensile stress of 900 MPa or more is insufficient, and processing with local deformation represented by stretch flange processing occurs. difficult question

Method used

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  • High-strength zinc-plated steel sheet and high-strength steel sheet having superior moldability, and method for producing each
  • High-strength zinc-plated steel sheet and high-strength steel sheet having superior moldability, and method for producing each
  • High-strength zinc-plated steel sheet and high-strength steel sheet having superior moldability, and method for producing each

Examples

Experimental program
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Effect test

Embodiment

[0155] Hereinafter, the high-strength steel sheet excellent in formability, the high-strength galvanized steel sheet of the present invention, and their manufacturing methods will be more specifically described using examples. Of course, the present invention is not limited to the following examples, and can be implemented with appropriate additions and changes within the range that can fit the gist of the present invention, and all of them are included in the technical scope of the present invention.

[0156] Slabs having chemical components (compositions) of A to AG shown in Tables 1 and 2 were cast, and hot rolling, cooling, coiling, and pickling were performed under the conditions shown in Tables 3 to 5 immediately after casting. Then, experimental examples 5, 14, 19, 24, 29, 34, 39, 44, 49, 54, 59, 98, 102, and 119 are in the state of hot-rolled steel sheets, and other experimental examples are according to tables 3 to 6 after pickling Cold rolling was carried out under t...

experiment example 115

[0220] Experimental Example 115 is an example in which the hot rolling finish temperature is low, and the microstructure is inhomogeneously elongated in one direction, so the ductility and stretch-flangeability are inferior.

[0221] In Experimental Examples 12, 17, 106, and 111, the heating rate from (maximum heating temperature −20° C.) in the heating step was high, the retained austenite phase became unstable, and the stretch flangeability was poor.

experiment example 28

[0222] Experimental Example 28 is an example in which the maximum heating temperature in the annealing process was high, and the soft structure was not sufficiently formed, and the ductility was poor.

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Abstract

This high-strength zinc-plated steel sheet and high-strength steel sheet having superior moldability and obtaining superior ductility and stretch-flanging properties while securing the high strength of a maximum tensile strength of at least 900 MPa have a predetermined component composition, the steel sheet structure containing 1-20% by volume fraction of a residual austenite phase, the martensite transformation point of the residual austenite phase being no greater than -60 DEG C.

Description

technical field [0001] The present invention relates to a high-strength steel sheet excellent in formability, a high-strength galvanized steel sheet, and methods for producing them. Background technique [0002] In recent years, there has been an increasing demand for higher strength of steel sheets used in automobiles and the like. In particular, high-strength steel sheets with a maximum tensile stress of 900 MPa or more have been used for the purpose of improving crash safety and the like. Such high-strength steel sheets are formed in large quantities and at low cost by press working similarly to mild steel sheets, and are supplied as components. [0003] However, in recent years, with the rapid increase in strength of high-strength steel sheets, the formability of high-strength steel sheets with a maximum tensile stress of 900 MPa or more is insufficient, and processing with local deformation represented by stretch flange processing occurs. difficult question. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21B3/00C21D9/46C22C38/58C23C2/06C23C2/28C25D5/26
CPCC23C2/28C21D2211/008C23C2/06C22C38/04C22C38/58C21D9/46C22C38/001C22C38/22C22C38/26C22C38/06C22C38/28C22C38/38C22C38/14C22C38/34C23C2/02C21D2211/001C22C38/005C22C38/12C21D8/0205C22C38/002C21D8/0263C21D8/0236B32B15/013C22C38/02C22C38/16C22C38/08C22C38/32C21D2211/002Y10T428/12799C23C2/29C23C2/024C23C2/0224B21B3/00C25D5/36
Inventor 川田裕之丸山直纪村里映信南昭畅安井健志山口裕司杉浦夏子
Owner NIPPON STEEL CORP
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