What is galvanized steel coil DX51D?
DX51D is one of the main grades of galvanized steel coil (strip) defined in the European standard EN 10346:2015.
D: stands for "Ductility", indicating that this grade of steel focuses on good forming performance.
51: is a serial number that identifies its specific mechanical properties and application range (usually refers to general forming purposes).
D (suffix): In the EN 10346 standard, the suffix letters (D, B, A) are used to distinguish different surface quality grades:
D: stands for "surface quality specified by the purchaser" or understood as "ordinary surface", suitable for most uses that do not require extremely demanding surface appearance (such as structural parts, some internal parts of home appliances, etc.). This is the most common and widely used grade.
Core Technology
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The core of DX51D steel coil production lies in the hot-dip galvanizing process:
1. Pre-treatment: The substrate of high-quality cold-rolled or hot-rolled steel coil is strictly cleaned (degreasing, pickling, rinsing, and plating) to ensure that the surface is absolutely clean and activated.
2. Hot-dip galvanizing: The steel strip is immersed in molten zinc liquid (about 450°C), and the iron-zinc reaction occurs to form a strong metallurgical bonding layer.
3. Zinc spangle control: By controlling the composition of zinc liquid (such as adding aluminum and antimony) and cooling method, different appearances (such as ordinary zinc spangles, small zinc spangles, and no zinc spangle smooth surface) can be obtained.
4. Post-treatment: It may include chromium passivation, oiling, smooth rolling, etc. to further improve corrosion resistance, processability or surface quality.
Zinc layer protection
Physical barrier: Isolates the steel substrate from the corrosive medium (water vapor, oxygen).
Electrochemical protection: Zinc has a more negative potential than iron, and acts as a sacrificial anode to corrode preferentially, protecting the steel substrate.
Self-healing: Zinc corrosion products (such as basic zinc carbonate) can fill tiny scratches and provide additional protection.
Specifications
| Parameter Category | Specific Item | Typical Range/Options |
|---|---|---|
| Substrate material | Steel grade | Meets DX51D requirements of EN 10346 |
| Substrate standard | - | EN 10346 |
| Coating type | - | Pure zinc coating (Z) |
| Coating weight | Common grades | Z100 (100 g/m²), Z140 (140 g/m²), Z180 (180 g/m²), Z200 (200 g/m²), Z275 (275 g/m²) |
|---|---|---|
| Surface structure | - | Normal spangle (N), small spangle (M), no spangle (brightening) (A) |
| Surface treatment | - | Passivated (C), oiled (O), passivated + oiled (CO) |
| Thickness (substrate) | General range | 0.30 mm - 3.00 mm (thicker or thinner can be customized) |
|---|---|---|
| Width | General range | 600 mm - 1500 mm (or divided into strips according to customer requirements) |
| Inner diameter | - | 508 mm (20 inches) / 610 mm (24 inches) |
Packaging and Shipping
Why choose us?
- Quality assurance, reliable source: We exclusively cooperate with large first-tier steel mills to ensure that each roll of DX51D complies with the EN 10346 standard, provides a complete material certificate (MTC), and has stable quality.
- Adequate stock and complete specifications: Large standing inventory covers common thickness (0.3mm-3.0mm), width, coating (Z100-Z275), and surface type (ordinary zinc flower/small zinc flower/smooth finish).
- Professional service, precise matching: A team of senior technical consultants provides you with free material selection guidance, and recommends the most cost-effective DX51D solution (coating, surface, treatment) according to your application scenario, processing method and budget to avoid performance waste or insufficient.
