Aluminum-zinc hot plating deep drawing steel with thick gauge of more than 1.2 mm, and manufacturing method thereof
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A manufacturing method, hot-dip aluminum technology, applied in manufacturing tools, metal rolling, temperature control, etc., can solve the problems of low output of home appliance boards and unattainable surface quality, so as to reduce production costs, improve production efficiency, and ensure yield performance effect
Inactive Publication Date: 2013-09-25
SHANGHAI MEISHAN IRON & STEEL CO LTD
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It mainly solves the existing technical problems that the surface quality cannot meet the requirements of the home appliance board and the output is low due to the reduction of the annealing speed to ensure the deep drawing performance.
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Embodiment 1-4
[0047] Table 3 Cold rolling and annealing process control parameters of Examples 1-4 of the present invention
[0048] Cold rolling and annealing parameters Cold rolling reduction / % Temperature of soaking section / ℃ soaking time / s set up 65～85 840-880 40-90 Example 1 65 880 40 Example 2 70 860 60 Example 3 78 850 80 Example 4 85 840 90 Comparative example 1 59.243 830 68 Comparative example 2 87 815 70
[0049] The mechanical properties of the hot-dip galvanized steel strip for ultra-deep drawing obtained by the above method are shown in Table 4.
[0050] Table 4 Mechanical properties of cold rolled samples
[0051] Performance Yield strength / MPa Tensile strength / MPa Elongation after break / % Example 1 142 295 38.5 Example 2 140 290 40 Example 3 135 280 41 Example 4 127 280 43.5 Comparative example 1 200 296 40.5 Comparative example 2 175 280...
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Abstract
The present invention relates to an aluminum-zinc plating deep drawing steel and a manufacturing method thereof. In the prior art, annealing rate reduction is adopted to ensure a deep drawing performance, such that the surface quality can not meet household appliance plate requirements, and a yield is low. With the present invention, the technical problems in the prior art are mainly solved. The manufacturing method comprises: smelting according to components, sequentially carrying out hot metal desulphurization, converter top and bottom composite blowing, steel ladle bottom argon blowing, RH furnace refining, protection casting through blowing Ar to low carbon steel protection slag, heating with a slab heating furnace, descaling, rough rolling, fine rolling, controlled cooling on the rear segment, and coiling to obtain a hot rolling slab, carrying out re-uncoiling, and carrying out acid washing, cold rolling and continuous annealing to obtain the finished product, wherein a continuous casting slab heating temperature is 1180-1220 DEG C, an intermediate billet after rough rolling is subjected to coiling through a hot coiling box, uncoiled, and then enters a first pass stand of the fine rolling, a fine rolling starting temperature is 990-1030 DEG C, a fine rolling end temperature is 890-??930 DEG C, a coiling temperature after fine rolling is 690-730 DEG C, a cold rolling reduction rate is 65-85%, an annealing temperature of the cold-rolled hard state strip steel at the soaking segment of the continuous annealing furnace is 840-880 DEG C, and a time of the strip steel at the soaking segment is 40-90 s.
Description
technical field [0001] The invention relates to an galvanized deep-drawing steel and a manufacturing method thereof, in particular to a hot-dip galvanized strip steel for deep drawing with a thickness greater than 1.2 mm and a manufacturing method thereof. Background technique [0002] With the advancement of the policy of sending home appliances to the countryside, the price competition in the home appliance industry has intensified. In order to maintain a high level of profitability, all manufacturers use low-cost materials to replace high-cost materials, and hot-dip galvanized strip steel for deep drawing with a thickness greater than 1.2mm came into being. [0003] This hot-dip galvanized material is mainly used to replace electro-galvanized products, and is used to produce bottom plates or back plates that require deep drawing in washing machines, air conditioners, and televisions. Compared with electro-galvanized materials, the cost of hot-dip aluminum-zinc from raw m...
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