Dx51d Dx52D Dx53D Z140 Galvanized Steel Coil
Popular specifications are in short supply!
click to get the specification sheet!
Dx51d z140 refers to steel products with high formability for cold forming, as indicated in the first letter D. The letter X indicates no specific substrate. The numbers 5 and 1 show the steel grade bearing its serial number, while the second D represents the hot-dip galvanizing code.
This galvanized steel coil has a high coating of pure zinc (Z) with a base material of low carbon. It underwent several stages of chemical process to protect it from abrasion and corrosion even after years of use. The zinc coating prevents rust from attacking the surface and inner parts. The steel undergoes a hot bath of molten zinc to become a permanent part of it and not work as a sealer or paint.
The addition of z140 refers to the zinc coating mass, which has a greater mass for weldability, formability, and bending applications.
- What does z140 mean?
Z140 is a coating designation of the galvanized steel coils. Its minimum total coating mass for both surfaces have a symbol of g/m2 or grams per square meter. Under this designation, the steel got a triple spot test of 140 and a single spot test of 120 g/m2.
The guidance value for coating thickness per surface has a symbol μm, a ten (10) μm typical value with a range of 7 to 15. The surface quality of Z140 is X for the letter A under Normal spangle (N). The Minimized spangle (M) has a triple X under the letters A, B, and C.
The Normal spangle is the result of the zinc coating solidifying naturally to form zinc crystals or no spangle. The Minimized spangle is the product of influencing the solidification of the zinc coating to produce a few spangles, and some spangles are not visible.
- Product Process
1 The crane lifts the coil to the inlet saddle, and the roll-up trolley takes the steel coil from the saddle and sends it to the unwinder drum.
2 The uncoiler rotates, the unwinding knife swings, and the steel head enters the pinch straightening machine
3 The strip runs forward, and the upper roll and the next roll are sheared and welded on the narrow seam welder.
4 strip steel is sprayed by alkali solution, lye scrubbing, electrolytic degreasing, water scrubbing, spray cleaning and drying, then enters the inlet looper
5 strip steel through the correcting roller, steering roller, tension roller into the vertical reduction annealing furnace
6 The strip steel is heat treated in an annealing furnace and then enters the zinc pot along the nose of the furnace.
7 The strip steel is attached with a layer of zinc liquid from the surface of the zinc pot. The compressed air blown by the air knife blows off the excess zinc liquid to ensure uniform thickness of the zinc layer.
8 strip steel enters air cooling, and then enters water quenching tank to cool
9 Strip steel through the finishing machine, tension leveler, enter the chemical treatment section for passivation treatment (line 5 has fingerprint resistance)
10 The strip enters the export looper, and the loop is inspected and oiled into the coiler for winding. When the required coil weight is reached, the coil is divided.
11 The unloading trolley removes the steel coil from the coiler, and the crane lifts the steel coil to the finished product warehouse for packaging.
- Surface Display
Surface state of Galvanized steel coil: Due to different treatment methods in the coating process, the surface state is different, forming Zero spangle, small spangle, Regular spangle and big spangle .
|
Regular spangle zinc coating |
In the normal solidification process of the zinc layer, the zinc crystal grains are freely grown to form a coating having a distinct zinc flower morphology.
|
|
small spangle zinc coating |
During the solidification of the zinc layer, the zinc grains are artificially restricted to form as fine a zinc coating as possible.
|
|
Zero spangle zinc coating |
By adjusting the chemical composition of the plating solution, there is no visible visible zinc flower morphology, and the surface is uniformly coated.
|
Popular specifications are in short supply!
click to get the specification sheet!
