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Hot dip zinc plated steel sheet having high strength and method for producing the same

A technology of hot-dip galvanized steel sheet and manufacturing method, which can be applied to manufacturing tools, hot-dip galvanizing process, heat treatment furnace, etc., and can solve problems such as difficulty in strength

Inactive Publication Date: 2003-11-19
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the high-strength hot-dip galvanized steel sheet produced by the method described in JP-A-7-54051 has a structure formed by finely dispersing pearlite or cementite in the ferrite matrix, so it can stably obtain a tensile strength exceeding 700 MPa. Tensile strength, especially the strength of more than 780MPa is very difficult

Method used

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  • Hot dip zinc plated steel sheet having high strength and method for producing the same
  • Hot dip zinc plated steel sheet having high strength and method for producing the same
  • Hot dip zinc plated steel sheet having high strength and method for producing the same

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Embodiment 1

[0037] What table 1 shows is that the steel A-R in the composition range of the present invention and the steel a-k outside the composition range are placed in the converter to cast ingots, and the billet is obtained by continuous casting. After hot rolling under the conditions in the scope of the present invention shown in Table 2, Carry out cold rolling with cold rolling ratio 60%, carry out galvanizing according to the condition in the scope of the present invention shown in Table 2 on continuous hot-dip galvanizing production line, the high-strength hot-dip galvanized steel sheet of the thickness 1.4mm of making.

[0038] Then, the second phase was observed with an electron microscope, the amount of remaining austenite was measured by X-ray diffraction, and the tensile strength TS was measured by a tensile test. In addition, in order to evaluate the characteristics of the HAZ after laser welding, an Ericsson test (cupping test) was performed on the base material and the las...

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Abstract

The invention relates to a high strength hot-dip galvanized steel sheet consisting essentially of 0.03 to 0.25% C, 0.7% or less Si, 1.4 to 3.5% Mn, 0.05% or less P, 0.01% or less S, 0.05 to 1% Cr, 0.005 to 0.1% Nb, by mass, and balance of Fe, and being made of a composite structure of ferrite and secondary phase, and having an average grain size of the composite structure of 10 mu m or smaller. Since the high strength hot-dip galvanized steel sheet of the present invention hardly induces softening at HAZ during welding, it is applicable to structural members of automobiles for Tailor Welded Blanks (TWB).

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet with a tensile strength exceeding 700 MPa, in particular to a high-strength hot-dip galvanized steel sheet that is less prone to softening in the heat-affected zone (HAZ) during welding and has excellent processability and its manufacture method. Background technique [0002] High-strength hot-dip galvanized steel sheets with a tensile strength exceeding 440MPa are widely used in building components, mechanical structural components, automotive structural components, etc. due to their excellent corrosion resistance and high strength characteristics. [0003] In recent years, requirements for workability have become increasingly strict, and proposals to improve the workability of such high-strength galvanized steel sheets have also been increasing. For example, the method proposed in Japanese Unexamined Publication No. 5-311244 is to heat the Si-Mn-P series hot-rolled steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/46C21D8/02C22C38/00C22C38/02C22C38/26C22C38/38C23C2/02C23C2/06C23C2/40
CPCY10T428/12799C21D2211/008C23C2/40C23C2/06C22C38/02C21D8/0278C23C2/02C22C38/38C21D8/0205C22C38/26C21D2211/005C21D2211/002C23C2/024C23C2/0224
Inventor 长泷康伸北野总人佐藤健太郎岩渊正洋蒲昭
Owner JFE STEEL CORP
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