Factory For Black Hot Rolled Low Carbon Steel Strip Coil in Building Material
It adheres for the tenet “Honest, industrious, enterprising, innovative” to develop new products and solutions continuously. It regards shoppers, success as its individual success. Let us produce prosperous future hand in hand for Factory For Black Hot Rolled Low Carbon Steel Strip Coil in Building Material, We welcome consumers all around the word to make contact with us for upcoming enterprise interactions. Our goods are the best. Once Selected, Ideal Forever!
It adheres for the tenet “Honest, industrious, enterprising, innovative” to develop new products and solutions continuously. It regards shoppers, success as its individual success. Let us produce prosperous future hand in hand for China Carbon Steel Coil and Steel, The development of our company not only needs the guarantee of quality, reasonable price and perfect service, but also relies on our customer’s trust and support! In the future, we’ll continue with the most experienced and high quality service to supply the most competitive price, Together with our customers and achieve win-win! Welcome to inquiry and consult!
Defects mainly include: falling off, scratches, passivation spots, zinc particles, thick edges, air knife stripes, air knife scratches, exposed steel, inclusions, mechanical damage, poor performance of steel base, wavy edges, ladles, improper size, embossing, improper thickness of zinc layer, roller printing, etc.
The main reasons for zinc layer falling off are: surface oxidation, silicon compounds, too dirty cold rolling emulsion, too high oxidation atmosphere in NOF section and dew point of protective gas, unreasonable air-fuel ratio, low hydrogen flow, oxygen infiltration in the furnace, low temperature of strip steel entering the pot, low furnace pressure in RWP section and air suction in furnace door, low furnace temperature in NOF section, endless oil evaporation, low aluminum content in zinc pot, too fast unit speed, insufficient reduction, too short residence time in zinc liquid The coating is too thick.
The causes of white rust and black spots are: black spots are formed by the further oxidation of white rust.
The main causes of white rust are:
(1) Poor passivation, insufficient or uneven passivation film thickness;
(2) The surface is not oiled or there is residual water on the surface of the strip steel;
(3) There is moisture on the surface of strip steel during coiling;
(4) Passivation is not completely dried;
(5) Damp or rain during transportation or storage;
(6) The storage time of finished products is too long;
(7) The galvanized sheet is in contact with or stored with other corrosive media such as acid and alkali.
The finished products can be stored in the warehouse for up to three months to avoid oxidation.
It adheres for the tenet “Honest, industrious, enterprising, innovative” to develop new products and solutions continuously. It regards shoppers, success as its individual success. Let us produce prosperous future hand in hand for Factory For Black Hot Rolled Low Carbon Steel Strip Coil in Building Material, We welcome consumers all around the word to make contact with us for upcoming enterprise interactions. Our goods are the best. Once Selected, Ideal Forever!
Factory For China Carbon Steel Coil and Steel, The development of our company not only needs the guarantee of quality, reasonable price and perfect service, but also relies on our customer’s trust and support! In the future, we’ll continue with the most experienced and high quality service to supply the most competitive price, Together with our customers and achieve win-win! Welcome to inquiry and consult!
