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Steel sheet hot-dip-coated with Zn-Al-Mg-based system, and process of manufacturing same

一种制造方法、热浸镀的技术，应用在热浸镀工艺、化学仪器和方法、涂层等方向，达到耐蚀性优良、加工性良好的效果

Active Publication Date: 2013-11-27
NISSHIN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the studies of the inventors, even if the method of this document is followed, it is not necessarily easy to stably avoid molten metal embrittlement cracking during welding of hot-dipped Zn-Al-Mg-based alloy steel sheets.

Method used

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  • Steel sheet hot-dip-coated with Zn-Al-Mg-based system, and process of manufacturing same
  • Steel sheet hot-dip-coated with Zn-Al-Mg-based system, and process of manufacturing same
  • Steel sheet hot-dip-coated with Zn-Al-Mg-based system, and process of manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Various steels with the compositions shown in Table 1 were smelted, and the slabs were heated to 1250°C, and then hot-rolled at a finish rolling temperature of 880°C and a coiling temperature of 530-700°C to obtain hot-rolled steel strips. Table 1 shows the thickness of the hot-rolled steel strip and the aforementioned H1 value or H2 value, and Table 4 shows the coiling temperature.

[0109] [Table 1]

[0110]

[0111] Underline: outside the scope of the present invention

[0112] After the hot-rolled steel strip is pickled, it is annealed at 550-730°C in a hydrogen-nitrogen mixed gas through a continuous hot-dip coating line, and cooled to about 420°C at an average cooling rate of 5°C / s. After that, in a state where the surface of the steel sheet is not in contact with the atmosphere, it is immersed in a Zn-Al-Mg system hot-dip coating bath having the following coating bath composition, and then lifted, and the coated steel plate is obtained by a gas wiping method....

Embodiment 2

[0147] Various steels having the compositions shown in Table 5 were melted, and hot-dipped Zn—Al—Mg-based steel sheets were obtained under the same production conditions as in Example 1. Table 5 shows the thickness of the hot-rolled steel strip and the aforementioned H3, and Table 6 shows the coiling temperature.

[0148] [table 5]

[0149]

[0150] Underline: outside the scope of the present invention

[0151] For each hot-dipped Zn-Al-Mg-based steel sheet, various tests were performed by the same method as in Example 1, and the characteristics thereof were evaluated. The results are shown in Table 6.

[0152] [Table 6]

[0153]

[0154] Underline: Outside the range specified by the invention Double underline: Insufficient characteristics

[0155] The material of the example of the present invention has a hole expansion ratio λ of more than 70% and a maximum base metal cracking depth of 0.1mm or less, and has excellent hole expansion and bending and resistance to mo...

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Abstract

[Problem] To provide a steel sheet hot-dip-plated with a Zn-Al-Mg-based alloy coating, which is remarkably improved in point of all the burring workability, the liquid metal embrittlement cracking resistance and the corrosion resistance in the welded part thereof, as a steel material favorable for arc-welded structural members. [Means for Resolution] A plated steel sheet having a Zn-Al-Mg-based alloy coating layer formed by hot-dipping on the surface of a base steel sheet for welded structural members, wherein the base steel sheet has a specific chemical composition and has a metallographic structure of such that Ti-containing precipitates having a mean particle diameter of at most 20 nm are dispersed in the matrix formed of a ferrite phase therein, and wherein the liquid metal embrittlement cracking sensitivity index H3 value of the base steel sheet represented by the following formula (3) and indicating the relationship between the contents of the steel components and the thickness t (mm) of the steel sheet is at most 2.90: H3 Value=C / 0.2+Si / 5.0+Mn / 1.3+Cr / 1.0+Mo / 1.2+0.4t-0.7(Cr+Mo)1 / 2(3)

Description

technical field [0001] The invention relates to a hot-dip Zn-Al-Mg steel plate and its manufacturing method. The steel plate is suitable for various arc welding structural parts represented by automobile body bottom parts such as cantilevers or suspension parts. Its resistance to molten metal Excellent embrittlement and cracking properties. Background technique [0002] Conventionally, underbody parts such as cantilevers and suspension members of automobiles are used by forming hot-rolled steel sheets into predetermined shapes by extrusion or the like, joining them by arc welding, and then applying cationic electrodeposition coating. However, Fe scales are formed on the surface of the steel sheet due to welding heat input during arc welding in the weld seam region and the vicinity of the seam end region. The scales are often peeled off together with the cationic electrodeposited coating film due to fatigue due to vibration of a running car, and in this case, corrosion often...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/38C21D8/02C22C18/04C23C2/06C23C2/40
CPCC22C38/14C21D8/0205C21D8/0278C22C38/002C23C2/02C23C2/06C23C2/40C22C38/04C21D2211/005C21D2211/004C22C18/04C22C38/06B60R13/00C22C38/02B32B15/013C22C38/28C22C38/001C22C38/38C22C23/02C22C23/04C22C38/12C22C38/32Y10T428/12799C23C2/024C23C2/0224C21D8/02
Inventor 平田健太郎片桐幸男藤原进细见和昭浦中将明
Owner NISSHIN STEEL CO LTD
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