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High-strength low-alloy hot-dip aluminized and galvanized steel strip and production method thereof

A high-strength, low-alloy, production method technology, applied in the direction of hot-dip plating process, metal material coating process, coating, etc., can solve the problems of high strength and low yield strength, and achieve low production cost and excellent manufacturing process. Simple, uniform coating effect

Active Publication Date: 2015-01-07
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN200310106261.3 discloses a hot-dip aluminum-zinc alloy steel plate and its manufacturing method. The method adopts ordinary cold-rolled substrates to produce aluminum-zinc-coated products. The yield strength is greater than 228MPa and the elongation is about 20%, but it cannot meet the requirements. Requirements for yield strength 410-570MPa
However, it cannot meet the requirements of yield strength 410-570MPa and elongation at break greater than 15%.
[0006] Chinese patent CN200710093976.8 discloses a hot-dip galvanized steel sheet / strip for deep drawing and its production method. The method uses IF steel substrates to produce galvanized products. The yield strength is 140-220MPa, and the tensile strength is 260-350MPa. The elongation is greater than 30%, but it cannot meet the requirement of yield strength of 410-570MPa
However, high-strength low-alloy hot-dip galvanized products with a yield strength of 410-570MPa, a tensile strength of not less than 470MPa, and an elongation of more than 15% are blank at home and abroad.

Method used

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  • High-strength low-alloy hot-dip aluminized and galvanized steel strip and production method thereof
  • High-strength low-alloy hot-dip aluminized and galvanized steel strip and production method thereof
  • High-strength low-alloy hot-dip aluminized and galvanized steel strip and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] According to the chemical composition shown in Table 1, after smelting and casting, the billet is obtained, and then hot rolling is carried out in the hot rolling heating furnace, and the hot rolling final rolling and hot rolling coil are carried out on the hot rolling line, and then cold rolling The hot rolling and cold rolling process conditions are shown in Table 2.

[0049] Before entering the continuous annealing furnace, the above-mentioned substrate strip steel is sent to the cleaning device to remove grease, iron powder and dust on the surface of the strip steel. Then the cleaned strip is squeezed by a squeeze roller and dried by hot air. The cleaned strip enters the continuous annealing furnace for annealing treatment. The annealing treatment includes four processes of preheating, heating, soaking and cooling, and the composition of the protective gas in the furnace is: 30% hydrogen and 70% nitrogen. The process conditions of annealing treatment are shown in ...

Embodiment 2

[0054] The embodiment is the same as that in Example 1, wherein the protective gas composition in the continuous annealing furnace is: 25% hydrogen and 75% nitrogen. During hot dipping, the temperature of the solution in the zinc pot is 600°C, the immersion time of the steel substrate in the zinc pot is 5 seconds, and the coating thickness reaches the set value through the air knife control system. After the steel strip is hot-dip galvanized in a zinc pot, it enters the air cooling system of the cooling tower for cooling at a cooling rate of 45°C / s.

Embodiment 3

[0056] The implementation mode is the same as that in Example 1, wherein the protective gas composition in the furnace is: 35% hydrogen and 65% nitrogen. During hot dipping, the temperature of the solution in the zinc pot is 570°C, the immersion time of the steel substrate in the zinc pot is 6 seconds, and the coating thickness reaches the set value through the air knife control system. After the steel strip is hot-dip galvanized, it enters the air cooling system of the cooling tower for cooling, and the cooling rate is 45°C / s.

[0057] Table 1 Unit: weight percentage

[0058]

[0059] Table 2

[0060]

[0061] table 3

[0062]

[0063]

[0064] Table 4

[0065]

[0066] It can be seen from Table 4 that the yield strength of the high-strength low-alloy hot-dip galvalume steel strip produced by the present invention is 410-570 MPa, the tensile strength is ≥ 470 MPa, and the elongation at break is ≥ 15%. The coating is uniform, dense, and of appropriate thickn...

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Abstract

The invention relates to a high-strength low-alloy hot-dip aluminized and galvanized steel strip and a production method thereof. The hot-dip aluminized and galvanized steel strip comprises a steel base plate and an alloy coating, wherein the steel base plate comprises the following chemical components in percentage by weight: 0.02-0.10% of C, 0.5-1.2% of Mn, 0.01-0.07% of P, 0.01-0.12% of Nb, less than or equal to 0.0080% of N, less than or equal to 0.02% of S and the balance of Fe and inevitable impurities, wherein Nb-0.22C-1.1N is equal to or greater than 0.01% and less than or equal to 0.1% and Mn / 1.7S is equal to or greater than 8; the alloy coating comprises the following chemical components in percentage by weight: 50-58% of Al, 40-45% of Zn, 1.0-2.0% of Si, 0.005-0.020% of Ti and the balance of unavoidable impurities. According to the hot-dip aluminized and galvanized steel strip, by virtue of smelting, casting, carrying out hot rolling and cold rolling, continuously annealing and carrying out hot-dip aluminizing and galvanizing, the aluminum-zinc coating is evenly and densely adhered to the steel base plate, the obtained low-alloy hot-dip aluminized and galvanized steel strip has the yield strength of 410-570MPa, the tensile strength equal to or greater than 470MPa and elongation equal to or greater than 15% and has both good strength and toughness and excellent corrosion resistance. The production process is low in cost and high in steel plate yield.

Description

technical field [0001] The invention belongs to the field of coiled steel plate material production, and in particular relates to a high-strength low-alloy hot-dip aluminum-zinc steel strip and a production method thereof. Background technique [0002] Due to its low cost and good strength and toughness, high-strength low-alloy steel has attracted widespread attention and been applied all over the world. Generally, the C component in steel is ≤0.1%. By adding alloy elements such as Ti and Nb, carbonitrides are formed with atoms such as C and N in the matrix, and these carbonitrides are precipitated in a small amount in the matrix to hinder the movement of dislocations. Thereby obtaining higher steel plate strength. People can choose pure Ti, pure Nb or Ti, Nb composite composition design to achieve the expected performance goals, but in terms of cost economy and performance stability, the type and ratio of the alloy added are the key factors that determine the manufacturabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/02C22C21/10C23C2/12C23C2/40
Inventor 马雪丹顾进荣田新芳
Owner BAOSHAN IRON & STEEL CO LTD
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