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A kind of hot-dip aluminum-zinc alloy steel plate and preparation method thereof

A zinc alloy and hot-dip aluminum technology, applied in hot-dip galvanizing process, metal material coating process, coating, etc., can solve the problem of high formability, good surface quality, low-carbon aluminum-killed steel hot-dip aluminum-zinc alloy plate Difficult to achieve and other problems, to achieve the effect of good weldability, high formability, and high surface quality

Active Publication Date: 2016-03-16
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve better surface quality and higher formability for low-carbon aluminum-killed steel hot-dip aluminum-zinc alloy sheets within the range of maintaining 250-310MPa yield strength and 350-380MPa tensile strength, especially difficult to obtain greater than 30% elongation

Method used

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  • A kind of hot-dip aluminum-zinc alloy steel plate and preparation method thereof
  • A kind of hot-dip aluminum-zinc alloy steel plate and preparation method thereof
  • A kind of hot-dip aluminum-zinc alloy steel plate and preparation method thereof

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preparation example Construction

[0039] According to the present invention, the preparation method of the hot-dip aluminum-zinc alloy steel sheet usually further includes passivating the obtained steel sheet, and the present invention preferably adopts chromium-free passivation. The passivation method is not particularly limited, and may be a conventional passivation method in the art. Preferably, the passivation is to use an environment-friendly chromium-free passivation solution to carry out surface treatment on the strip steel by means of roll coating, and the conditions of the passivation include: the roll speed ratio of the roll coating coating and the dipping roll is 130: 70, the rolling pressure of the upper roller is 50-110daN, and the rolling pressure of the lower roller is 70-140daN. Under this condition, the film thickness can be uniform and stable without obvious color difference.

[0040] Through the above preparation method, a hot-dip aluminum-zinc alloy with a yield strength of 250-310MPa, a t...

Embodiment 1-3

[0043] This example is used to illustrate the hot-dip aluminum-zinc alloy steel sheet and its preparation method of the present invention.

[0044] The steel slabs obtained by continuous casting (the composition of which is shown in Table 1) are hot-rolled and cold-rolled (the finishing rolling temperature of hot rolling is 1000°C, the finishing rolling temperature is 870°C, and the coiling temperature is 720°C ; The cold-rolling reduction rate is 70%) to obtain cold-rolled steel sheets. Alkaline cleaning, electrolytic cleaning, annealing and aluminum-zinc alloy plating are carried out on the continuous hot-dip galvanizing unit at a transmission speed of 100m / min. Among them, the alkaline cleaning conditions are: the free alkalinity is controlled at 72Pt, and the temperature is 83°C; the electrolytic cleaning conditions are: the free alkalinity is controlled at 72Pt, the temperature is 83°C, and the electrolytic current is controlled at 7000A; the above annealing is at 760°C ...

Embodiment 4

[0046] According to the method in Example 1, the difference is that the alkaline cleaning conditions are: the free alkalinity is controlled at 70Pt, and the temperature is 80°C; the conditions for electrolytic cleaning are: the free alkalinity is controlled at 70Pt, the temperature is 80°C, and the electrolytic current In 6800A, the resulting hot-dip galvalume steel sheet see figure 2 .

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Abstract

The invention discloses a hot-dipped aluminum-zinc alloy steel plate. The hot-dipped aluminum-zinc alloy steel plate comprises a steel plate base material and an aluminum-zinc alloy clad layer which is arranged on the surface of the steel plate base material, wherein the steel plate base material contains the following ingredients by adopting the total weight of the steel plate base material as a benchmark: 0.01 to 0.039 percent by weight of C, 0.15 to 0.19 percent by weight of Mn, less than 0.015 percent by weight of P, 0.02 to 0.07 percent by weight of Al, 0.005 to 0.025 percent by weight of Ti, less than 0.05 percent by weight of Si, less than 0.015 percent by weight of S, 99.59 to 99.8 percent by weight of Fe and the balance of unavoidable impurities. The invention also discloses a preparation method of the hot-dipped aluminum-zinc alloy steel plate. By adopting the preparation method, the yield strength of the prepared hot-dipped aluminum-zinc alloy steel plate is maintained at 250MPa to 310MPa, the tensile strength is 300MPa to 380MPa, the surface quality is good, and the forming performance is high.

Description

technical field [0001] The invention relates to a hot-dip aluminum-zinc alloy steel plate and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of science and technology, the application range of hot-dip aluminum-zinc alloy steel sheets has become more and more extensive. Among them, the hot-dip aluminum-zinc alloy steel sheets used in electric control cabinets tend to be better under the condition of meeting a certain strength. Excellent surface quality, high formability, welding performance and other developments. However, it is difficult to achieve better surface quality and higher formability for low-carbon aluminum-killed steel hot-dip galvanized alloy sheets within the range of maintaining 250-310MPa yield strength and 350-380MPa tensile strength, especially difficult to obtain greater than 30% elongation. [0003] Therefore, there is an urgent need for a hot-dip aluminum-zinc alloy sheet that can achieve a certai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02C23C2/12
Inventor 付佑春郑之旺王敏莉张功庭岳安宏王礞余灿生
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP