Dx51d Z150 Galvanized Steel Coil
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Dx51d Z150 galvanized steel coil is a coating and steel grade designation under the ASTM A653 / A653M requirements or specifications. The direct function of coating thickness is to protect the steel product against atmospheric corrosion.
- What is dx51d z150 Galvanized Steel Coil?
Manufacturers describe dx51d z150 material as a mild steel zinc-coating to steel products. Specifically, dx51d is a steel grade characterized by its cold-forming bending and profiling qualities. This steel grade corresponds to the steel number 1.0917.
Consequently, Z150 is the coating designation, and Zinc (Z) is the type of coating applied. However, other types of coating layers available for this steel grade include aluminum-silicon-alloy (AS), aluminum-zinc-alloy (AZ), zinc-magnesium-alloy (ZM), zinc-aluminum-alloy (ZA), and zinc-iron-alloy (ZF).
Under the Z150 specification, galvanized steel coils must have a minimum zinc coating weight of 150 grams per square meter (g/m2) on both sides. The product must pass the triple-spot test (TST).
During corrosion, the zinc coating protects the steel from rusting. When exposed to corrosive environments, the zinc coating will corrode instead of the steel. Hence, the common logic for zinc-coating is that a thicker zinc coating corresponds to a more significant layer of protection.
- What does z150 mean?
Z150 in Dx51d Z150 Galvanized Steel Coil is the actual coating designation.
Z in Z150 denotes the zinc-coating of the product; manufacturers supply the steel product with zinc coatings or simply zinc-coated. Meanwhile, the numeric 150 represents the product's minimum zinc coating weight of 150 g/m2 as determined by the triple-spot test (TST).
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- 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.
- Galvanized Surface Selection
|
Use of The Environment |
Recommended Zinc Thickness |
|
Indoor Use |
Z10 or Z12 (100g/㎡or 120g/㎡) |
|
Suburbs |
Z20 and Painting (200g/㎡) |
|
Urban or Industrial Area |
Z27 (270g/㎡) or G90 (US Standard) and painted |
|
Coastal Area |
Thicker than Z27 (270g/㎡) or G90 (US Standard) and painted |
|
Punch or Deep Drawing Application |
Thicker than Z27 (270grams/㎡) or G90 (US Standard) avoid coating peeling after stamping |
|
Surface Treatment Type |
Code |
Features |
|
Chromic Acid Treatment |
C |
Good corrosion resistance, suitable for bare state |
|
Chromic Acid Treatment+Oiling |
S |
Good corrosion resistance |
|
Phosphoric Acid Treatment (Including Sealing Treatment) |
P |
Have a certain corrosion resistance, good paint performance |
|
Phosphoric Acid Treatment (Including Sealing Treatment)+Oiling |
Q |
Has a certain corrosion resistance, good paint performance, prevent rust during transportation and storage |
|
Phosphoric Acid Treatment (Excluding Sealing Treatment) |
T |
Have a certain corrosion resistance, good paint performance |
|
Phosphoric Acid Treatment (Excluding Sealing Treatment)+Oiling |
V |
Has a certain corrosion resistance, good paint performance, and prevent rust |
|
Oiling |
O |
Prevent rust during transportation and storage |
|
No Treatment |
M |
Suitable for immediate painting |
