What are the applications of DX51D+Z80 coil in the construction industry?
It can be used in steel structure construction projects such as buildings, bridges, towers, tunnels, and airports, as well as roofs and walls.
In automotive manufacturing, what parts are DX51D+Z80 coils used for?
It can be used in the manufacture of components such as automobile bodies, doors, roofs, and floors.
What are the common quality defects of DX51D+Z80 coils?
Main defects include peeling, scratches, dull spots, zinc particles, thick edges, air knife streaks, air knife scrapes, exposed steel, inclusions, mechanical damage, poor steel base performance, wavy edges, warping, dimensional inconsistencies, embossing, zinc layer thickness inconsistencies, and roller marks.
What causes zinc layer peeling? Surface oxidation, the presence of silicon compounds, contaminated cold rolling emulsion, high dew points of the oxidizing atmosphere and shielding gas in the NOF section, an inappropriate air-fuel ratio, low hydrogen flow, oxygen infiltration into the furnace, low strip entry temperature, low RWP section furnace pressure and door draft, low NOF section furnace temperature, incomplete grease evaporation, low aluminum content in the zinc pot, excessive unit speed, inadequate reduction, short zinc bath residence time, and excessively thick coatings can all lead to zinc layer shedding.
How does white rust form?
The main causes of white rust include poor passivation, insufficient or uneven passivation film thickness, lack of surface oil application or residual moisture on the strip surface, moisture on the strip surface during coiling, incomplete passivation drying, moisture or rain exposure during transportation or storage, prolonged storage of finished products, and contact or storage of galvanized sheet with other corrosive media such as acids and alkalis.