A method for eliminating white marks on galvanized home appliance board
A technology for home appliances and white marks, applied in hot-dip galvanizing process, furnace, heat treatment equipment, etc., can solve the problem of irregular distribution of white marks on galvanized home appliance boards, improve product quality and market competitiveness, and achieve high indirect benefits Effect
Active Publication Date: 2021-12-14
ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD +1
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Problems solved by technology
[0004] (1) Morphology and distribution: The distribution of white mark defects on galvanized home appliance sheets is irregular, and may occur on the upper and lower surfaces, and the position on the horizontal and longitudinal surface of the strip is not fixed, but once it appears, it is continuous, such as the entire half roll, or white marks
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[0022] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0023] figure 1 It is the comparison diagram of the macroscopic and enlarged morphology of the white mark area and the normal area of the galvanized home appliance plate; among them, figure 1 (a) is the macroscopic appearance of white mark area and normal area of galvanized home appliance sheet; figure 1 (b) is a sample of galvanized home appliance panels. Areas A and C are normal panels (no white mark defects), and area B is the area with white marks. The pictures are 50 times magnified for different positions and roughness detection positions. figure 1 (c) is the morphology of the normal area of the galvanized home appliance panel A and the position of the detected roughness, figure 1 (d) is the morphology and roughness detection position of the white mark area of galvanized home appliance board B, figure 1 (e) is the morphology of the...
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Abstract
The invention discloses a method for eliminating white marks on a galvanized home appliance plate. The galvanized home appliance plate is formed after passing through molten iron, slab, hot-rolled coil, and hard-rolled coil; wherein, the hot-rolled coil is specifically: using a hot rolling mill, The slab is heated by a heating furnace, then rough rolled, finish rolled, and laminar flow cooled, and finally coiled into hot rolled coils. The hot rolling process parameters are: final rolling temperature 880±20°C, coiling temperature 650± 20°C, enter the next acid rolling process, and produce hard rolled coils. Through the present invention, the amount of white marks on galvanized home appliance boards is reduced from 248 tons to 0 tons. According to the calculation of 500 yuan / ton of galvanized defective products, 124,000 yuan of losses can be recovered every month; secondly, the indirect benefits are also relatively high, mainly After the white mark problem of galvanized home appliance panels is solved, the product quality and market competitiveness of galvanized home appliance panels will be further improved.
Description
technical field [0001] The invention relates to the technical field of galvanized home appliance panels, in particular to a method for eliminating white marks on galvanized home appliance panels. Background technique [0002] Shagang Cold Rolling has two acid tandem rolling units with an annual output of 2 million 1420 mm and one hot-dip galvanizing unit with an annual output of 400,000 tons. The hot-dip galvanizing unit is designed and engineered by German SMS SMS, and the core equipment is imported from abroad. The production line is advanced in technology and can provide high-precision and high-quality hot-dip galvanized sheets for subsequent processes. The products are mainly positioned as high-end home appliance sheets, automotive sheets and high-end architectural color-coated sheets. Shagang's hot-dip galvanizing line reached the production capacity at the end of 2015. At the beginning of operation, it mainly produced building panels. From 2017, it gradually began to d...
Claims
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IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/08C22C38/16C23C2/06C23C2/40C21D1/26C21D6/00C21D8/02C21D9/52B21C37/02
CPCC22C33/04C22C38/004C22C38/02C22C38/04C22C38/002C22C38/16C22C38/08C21D1/26C21D6/008C21D6/005C21D6/001C21D8/0221C21D9/52C23C2/06C23C2/40B21C37/02
Inventor 赵刚曹垒张婷马燕
Owner ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD