High-strength hot-dip galvanized steel sheet with excellent spot weldability and stability of material properties

A technology of hot-dip galvanized steel sheet and temperature setting, which is applied in the field of hot-dip galvanized steel sheet, which can solve the problems of insufficient stability of steel sheet material and undisclosed steel sheet, etc., and achieve the effect of excellent spot weldability and excellent tensile strength

Inactive Publication Date: 2006-11-08
KOBE STEEL LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of JP-A-198459 / 1989, JP-A-105960 / 1993 and JP-A-193419 / 1999 discloses steel sheets produced for this purpose
Therefore, the material properties of the steel plates disclosed therein are not stable enough

Method used

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  • High-strength hot-dip galvanized steel sheet with excellent spot weldability and stability of material properties
  • High-strength hot-dip galvanized steel sheet with excellent spot weldability and stability of material properties
  • High-strength hot-dip galvanized steel sheet with excellent spot weldability and stability of material properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Each of A-O type steels having the chemical composition given in Table 1 was melted in a converter to form a 230 mm thick slab. Each of these samples was hot-rolled under the following conditions: a heating temperature of 1200°C; a finish rolling temperature of 850-900°C; and a coiling temperature of 510-600°C. As a result, a hot-rolled steel sheet having a thickness of 2.8 mm was obtained. Then, each hot-rolled steel sheet was pickled to remove surface scales, and then cold-rolled, thereby obtaining a 2.0 mm-thick cold-rolled steel sheet. As shown in Table 2, the cold-rolled steel sheets thus obtained were annealed under annealing (soaking) conditions, and then subjected to hot-dip galvanizing treatment (cooling and galvanizing) under hot-dip galvanizing conditions in order to obtain plated steel sheets with one side Hot-dip galvanized steel sheet (one side: 45g / m 2 ).

[0053] The strength (TS), yield strength (YP) and elongation (EL) of the steel sheet thus obtain...

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Abstract

A high-strength hot-dip galvanized steel sheet is provided which comprises a composite structure consisting essentially of ferrite and martensite. The steel comprises, by mass %, C: 0.05 to 0.12%, Si: not more than 0.05%, Mn: 2.7 to 3.5%, Cr: 0.2 to 0.5%, Mo: 0.2 to 0.5%, Al: not more than 0.10%, P: not more than 0.03%, and S: not more than 0.03%. The high-strength hot-dip galvanized steel sheet has not only excellent spot weldability, but also excellent 'stability of material properties', including tensile strength, total elongation, and yield strength, in a high range of strengths from 780 to 1180 MPa, even if the manufacturing condition (especially, the condition of the cooling process after annealing the steel sheet) is changed.

Description

technical field [0001] The present invention relates to a hot-dip galvanized steel sheet having excellent spot weldability and stability of material properties. Specifically, the present invention relates to a high-strength hot-dip galvanized steel sheet excellent in spot weldability and stability of material properties including tensile strength (TS), elongation (total elongation , EL) and yield strength (YP), within a wide range of tensile strength (TS) of 780 to 1180 MPa, these properties change very little regardless of the post-cooling conditions of the steel sheet after annealing (soaking). Background technique [0002] Recently, there has been an increasing demand for improvement in crash safety of vehicles and the like. High-strength steel plates are widely used in frames of vehicle bodies and the like to ensure the safety of passengers upon impact and to improve fuel economy by reducing an increase in vehicle weight due to equipping fail-safe devices. In particula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C21D7/00C21D8/00C21D9/46C22C38/00C22C38/04C22C38/38C23C2/02C23C2/06C23C2/40
CPCC21D8/00Y10T428/12799Y10T428/12972B03B5/62B05B1/00B09C1/02
Inventor 内海幸博山本胜大
Owner KOBE STEEL LTD
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