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Hot-dipped aluminum-zinc alloy steel plate and manufacturing method thereof

A zinc alloy, hot-dip aluminum technology, applied in hot-dip plating process, metal material coating process, coating, etc. Surface quality, cost-effective effects

Active Publication Date: 2014-09-24
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, this invention relates to SPCD steel strips with a yield strength of 240 MPa or less and a tensile strength of 270 MPa or less, and does not involve the hot-dip galvanizing process and surface quality control of high-strength steel

Method used

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  • Hot-dipped aluminum-zinc alloy steel plate and manufacturing method thereof
  • Hot-dipped aluminum-zinc alloy steel plate and manufacturing method thereof
  • Hot-dipped aluminum-zinc alloy steel plate and manufacturing method thereof

Examples

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preparation example Construction

[0041] 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.

[0042] Through the above preparation method, it is possible to prepare a hot-dip galvalume with a yield strength hi...

Embodiment 1-3

[0045] This example is used to illustrate the hot-dip aluminum-zinc alloy steel sheet and its preparation method of the present invention.

[0046] The steel slabs obtained by the continuous casting method are hot-rolled and cold-rolled (the starting temperature of the hot rolling finish rolling is 1050°C, the final rolling temperature is 860°C, and the coiling temperature is 600°C; the cold rolling reduction rate is 65% ) 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 alkali cleaning conditions are: the free alkalinity is controlled at 75Pt, and the temperature is 80°C; the electrolytic cleaning conditions are: the free alkalinity is controlled at 75Pt, the temperature is 85°C, and the electrolytic current is controlled at 7000A; the above annealing is at 750°C Perform annealing for 35s; after...

Embodiment 4

[0048] According to the method in Example 1, the difference is that the alkaline cleaning conditions are: the free alkalinity is controlled at 65Pt, and the temperature is 70°C; the conditions for electrolytic cleaning are: the free alkalinity is controlled at 65Pt, the temperature is 75°C, and the electrolytic current At 6500A, 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 which includes a steel plate base material and an aluminum-zinc alloy coating on a surface of the steel plate base material, wherein the steel plate base material comprises, based on the total weight of the steel plate base material, 0.04-0.12 wt% of carbon, 0.2-0.6 wt% of manganese, 0.02-0.1 wt% of phosphorus, 0.01-0.05 wt% of titanium, 0.02-0.07 wt% of aluminum, less than 0.05 wt% of silicon, less than 0.015 wt% of sulfur, 98.99-99.71 wt% of ferrum and the balance unavoidable impurities. The invention also discloses a manufacturing method of the hot-dipped aluminum-zinc alloy steel plate. By means of the manufacturing method, the hot-dipped aluminum-zinc alloy steel plate which is high in strength and good in surface quality can be manufactured. The manufacturing method is simple in technology and low in cost.

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, as the requirements for energy saving, emission reduction, energy consumption, product stability and safety of hot-dip aluminum-zinc alloy steel sheets for building structures and household appliances have become higher and higher, the requirements for high-strength, high-surface quality, thin coatings The demand for hot-dip aluminum-zinc alloy steel sheets is also increasing. [0003] At present, this type of steel plate with excellent performance is mainly prepared by controlling the composition and production process. For example, CN101736195A discloses a hot-dip aluminum-zinc alloy steel plate and its production method. The steel plate base material used for the hot-dip aluminum-zinc alloy steel plate Containing greater than 0.03% to 0.1% by weight of C, 0.15-0.35% by weight of Mn, 0.001-0.02% by weigh...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02C23C2/06C23C2/40C23C2/20
Inventor 张功庭郑之旺刘春富岳安宏王敏莉
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP