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Hot-dip aluminizing zincium steel plate/belt for deep drawing and method for producing the same

A production method and hot-dip aluminum technology, which are applied in hot-dip plating process, chemical instruments and methods, heat treatment furnaces, etc., can solve the problems of inability to reach deep drawing level, inability to meet deep drawing, inability to meet corrosion resistance and high temperature resistance, etc. , to achieve the effect of simple manufacturing process, excellent deep drawing performance and appropriate thickness

Active Publication Date: 2009-01-28
BAOSHAN IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0008] Before the present invention was made, due to the relatively high strength of the Al-Zn coating (yield strength about 440MPa), general Al-Zn products could not meet the requirements of deep drawing level, such as CN200310106261.3, which discloses a hot-dip Al-Zn alloy steel plate And its manufacturing method, the method of this invention adopts common cold-rolled base plate to produce galvanized product, and its yield strength is all greater than 228MPa, and elongation is about 20%, can not satisfy the requirement of deep drawing
However, although the IF steel plated with pure zinc has deep drawing performance, it cannot meet the performance requirements of corrosion resistance and high temperature resistance.

Method used

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  • Hot-dip aluminizing zincium steel plate/belt for deep drawing and method for producing the same

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Embodiment 1

[0033] In this embodiment, the IF steel cold-rolled plate with a thickness of 0.5 mm, a width of 920 mm, and three-dimensional r values ​​greater than 1.8 is selected as the substrate, and its chemical composition is C: 0.002%, Si: 0.005%, and Mn: 0.14. %, P: 0.011%, S: 0.0076%, Ti: 0.057%, and the balance is Fe and unavoidable impurities.

[0034] First, the above-mentioned IF steel cold-rolled substrate strip is sent to the cleaning device to remove grease, iron powder and dust on the surface of the strip. Then the cleaned strip is squeezed by a squeeze roller and dried by hot air. The cleaned steel strip enters the continuous annealing furnace for annealing treatment (including four processes of preheating, heating, soaking and cooling). The protective gas composition in the furnace is: hydrogen 28%, nitrogen 72%. The temperature in the preheating section is 764°C, and the preheating time is 6.2 seconds; the temperature in the heating section is 614°C, and the heating time...

Embodiment 2

[0038] In this embodiment, IF steel with brand name DC04 and specifications (thickness 1.0mm, width 1090mm) is selected as the substrate, and its chemical composition is, C: 0.0017%, Si; 0.015%, Mn: 0.137%, P: 0.0127%, S: 0.0061%, Ti: 0.0529%, the balance is Fe and unavoidable impurities.

[0039]First, the above-mentioned IF steel cold-rolled substrate strip is sent to the cleaning device to remove grease, iron powder and dust on the surface of the strip. Then the cleaned strip is squeezed by a squeeze roller and dried by hot air. The cleaned steel strip enters the continuous annealing furnace for annealing treatment (including four processes of heating, heating, soaking and cooling), and the composition of the protective gas in the furnace is: hydrogen 27%, nitrogen 73%. The temperature in the preheating section is 782°C, and the preheating time is 12.5 seconds; the temperature in the heating section is 609°C, and the heating time is 18 seconds; the temperature in the soaki...

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Abstract

The invention provides a deep drawing hot-dipped al-zn steel plate / strip and a production method thereof. The deep drawing hot-dipped al-zn steel plate / strip comprises an IF steel substrate and an alloy coating and the chemical constituents of the substrate (wt percent) are that C is less than or equal to 0.01, Si is less than or equal to 0.12, Mn is less than or equal to 0.6, P is less than or equal to 0.1, S is less than or equal to 0.045, Ti is less than or equal to 0.3 and the allowance is Fe and inevitable impurities. The production method comprises substrate degreasing treatment, annealing treatment and hot dipping, and the annealing treatment is carried out in a continuous annealing furnace and protective gas contents in the annealing furnace are 10 to 60 percent. The yield strength of the steel plate / strip of the invention reaches 140 to 220 MPa, the tensile strength is 260 to 350 MPa and the elongation is more than 30 percent; the production method of the invention is simple in production process and strong in operability.

Description

technical field [0001] The invention belongs to the field of coiled steel sheet material production, and more specifically relates to a hot-dip galvanized steel sheet / strip for deep drawing and a production method thereof. Background technique [0002] Ultra-deep drawing cold-rolled steel, that is, IF steel (interstitial-free steel), full name Interstitial-Free Steel, sometimes called ultra-low carbon steel, has excellent deep drawing performance, elongation and r value can reach 50% and 2.0 or above. It is the latest generation of cold-rolled steel plate with the best deep drawing performance in the world after boiling steel and low-carbon aluminum-killed steel. IF steel can be divided into ordinary grade IF steel with r≥1.8 and high-end grade IF steel with r≥2.0. [0003] IF steel was successfully developed for the first time in 1949. It was not until the 1980s that with the further development of metallurgical production technology, low-carbon steel with C≤0.002% could ...

Claims

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Application Information

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IPC IPC(8): B32B15/01C22C38/00C23C2/12C21D9/46C21D9/52C23C2/26
Inventor 马雪丹顾进荣田新芳
Owner BAOSHAN IRON & STEEL CO LTD
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