Hot-dip galvanized steel sheet with high tensile strength and superior processability and method for producing same

A hot-dip galvanized steel sheet, excellent workability technology, applied in manufacturing tools, chemical instruments and methods, heat treatment furnaces, etc., and can solve the problems of characteristics (strength deviation, insufficient uniformity of steel sheet characteristics, insufficient ends, etc., To achieve the effect of good surface quality and excellent workability

Active Publication Date: 2013-01-30
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, especially when a strength of 980 MPa or higher is to be obtained, the uniformity of properties of the steel sheet tends to be insufficient, and in particular, variations in properties (strength, etc.) tend to occur in the width direction of the steel plate. Problems such as inability to obtain sufficient characteristics

Method used

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  • Hot-dip galvanized steel sheet with high tensile strength and superior processability and method for producing same
  • Hot-dip galvanized steel sheet with high tensile strength and superior processability and method for producing same
  • Hot-dip galvanized steel sheet with high tensile strength and superior processability and method for producing same

Examples

Experimental program
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Effect test

Embodiment 1

[0142] Molten steel having the composition shown in Table 1 was smelted and continuously cast by a generally known method to obtain a 250 mm thick steel billet (steel raw material). After heating these slabs to 1250°C, rough rolling was performed, finish rolling was performed at the finishing temperature shown in Table 2, and coiling was performed at the coiling temperature shown in Table 2 to obtain steel sheets with a thickness of 2.3 mm. Hot rolled sheet.

[0143] The various hot-rolled sheets obtained as described above were subjected to continuous annealing treatment through a continuous hot-dip galvanizing line at the annealing temperature and holding time at the annealing temperature under the conditions shown in Table 2, and then immersed in molten zinc at 550°C. , performing a hot-dip galvanizing treatment to form a hot-dip galvanized film on the surface, thereby manufacturing a hot-dip galvanized steel sheet. It should be noted that the amount of coating adhesion is...

Embodiment 2

[0179] The molten steel with the composition shown in Table 5 was smelted and continuously cast by a generally known method to obtain a steel slab (steel raw material) with a thickness of 250 mm. After heating these slabs to 1250° C., rough rolling was carried out. The implementation settings are shown in Table 6. Finish rolling at the finishing temperature shown in Table 6, cooling at the average cooling rate (average cooling rate from finishing rolling temperature to coiling temperature) shown in Table 6, and coiling at the coiling temperature shown in Table 6 , to obtain a hot-rolled steel plate with a plate thickness of 2.3 mm.

[0180] Various hot-rolled sheets obtained as described above were subjected to continuous annealing treatment by a continuous hot-dip galvanizing line at the annealing temperature and holding time at the annealing temperature under the conditions shown in Table 6, and then immersed in molten zinc at 550°C. A hot-dip galvanizing treatment is perfor...

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Abstract

Disclosed is a hot-dip galvanized steel sheet with high tensile strength that is provided with both strength and processability (elongation and stretch flangeability) and a method for producing the same. Specifically disclosed is a hot-dip galvanized steel sheet with high tensile strength that has tensile strength of 980 MPa or greater and superior processability. This hot-dip galvanized steel sheet has a composition containing 0.07 - 0.13% C, 0.3% or less Si, 0.5 - 2.0% Mn, 0.025% or less P, 0.005% or less S, 0.0060% or less N, 0.06% or less Al, 0.10 - 0.14% or less Ti, and 0.15 - 0.30% V (% by mass) such that S and N satisfy Ti >= 0.10 + (N / 14*48 + S / 32*48) and 0.8 <= (Ti / 48 + V / 51) / (C / 12) <= 1.2 (wherein C, Ti, V, S and N are the content for each element in % by mass). The composition further contains 0.04 - 0.1% V in solid solution and 0.05% or less Ti in solid solution, and the remainder is Fe and unavoidable impurities. The hot-dip galvanized steel sheet has a matrix that is 97% or more in areal proportion of the overall structure of the ferrite phase and a hot-dip galvanized coating or alloyed hot-dip galvanized coating on the surface of a hot-rolled steel sheet that has fine carbide that has an average particle diameter of less than 10 nm and contains Ti and V dispersed and precipitated, with a structure forming 0.007 or more in areal proportion of the overall structure of that fine carbide.

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet having both a high tensile strength (TS) of 980 MPa or higher and excellent workability, which is suitable as a raw material for automotive parts and the like, and a method for producing the same. Background technique [0002] Recently, from the viewpoint of protecting the global environment, in order to reduce CO 2 Emissions are required to reduce the weight of the car body and improve the fuel efficiency of the car. In addition, in order to ensure the safety of the occupants in the event of a collision, it is also required to strengthen the vehicle body and improve the crash safety of the vehicle body. In this way, in order to simultaneously reduce the weight of the automobile body and improve safety, it is effective to increase the strength of the raw materials for automobile parts and reduce the thickness of the plate within the range where rigidity does not become a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/38C21D8/02C21D9/46C23C2/06
CPCC23C2/02C21D8/0426C22C38/14C21D9/48C23C2/06C22C38/12C22C38/04C21D2211/005C21D2211/004C21D8/021C22C38/06C22C38/02C21D8/0226B32B15/013C21D9/56C21D8/0473C22C38/001C23C2/0224C22C38/38C21D8/02C21D9/46
Inventor 有贺珠子中岛胜己船川义正
Owner JFE STEEL CORP
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