What is DX51D?
DX51D is a grade of hot-dip galvanized low-carbon steel under EN 10346, which is primarily used for cold-forming applications. It offers excellent corrosion resistance and flexibility. It is usually used in construction, automotive manufacturing, and household appliances due to its versatility.
Breaking Down the DX51D Designation
"D" – Cold Forming Steel
"X" – Unspecified Rolling State. It can be either hot-rolled or cold-rolled.
"51" – Steel Grade Serial Number. The higher numbers (e.g., 52, 53, 54) indicate better formability.
"D" – Hot-Dip Galvanized Coating
"+Z, +ZF, etc." – Coating Types.
DX51D Equivalent Steel Grade and Material Number
| Region | Standard | Equivalent Grade |
| Europe | EN 10346 | DX51D |
| United States | ASTM A653 | A653/A653M Class B |
| Japan | JIS G3302 | SGCC |
| China | GB/T 2518 | Q195/Q235 |
| India | IS 277 | IS 277 |
| German | DIN EN 10130, DIN 1623 | 1.0322, 1.0335, DC01, DC04, DD11, DD13, St12, St14, St22, StW24, USt3, USt4 |
Material Number
1.0917: Material number based on the European material standard EN 10027-2.
1.0226: Confirmed as the most commonly used material number for DX51D under the EN 10346 standard
DX51D Steel Chemical Composition
| C | Si | Mn | P | S | Ti |
| max 0.18 | max 0.5 | max 1.2 | max 0.12 | max 0.045 | max 0.3 |
DX51D Steel Mechanical Property
| Mechanical Property | Value | Value |
| Tensile Strength | 270-500 MPa | 39,200-72,500 psi |
| Elongation | ≥ 22% | ≥ 22% |
Coating Parameters
- Zinc coating weight: Common specifications include 80g/m², 120g/m², 150g/m², 180g/m², and 275g/m². The specific zinc coating weight depends on the usage environment and customer requirements.
- Zinc coating thickness: The zinc coating thickness is related to the zinc coating weight. For example, an 80g/m² zinc coating has a thickness of approximately 11μm, while an 180g/m² zinc coating has a thickness of approximately 27μm.
Tolerances
- Thickness tolerance: For example, for steel sheets with a thickness between 0.6mm and 0.8mm, the tolerance is ±0.06mm; for thicknesses between 0.8mm and 1mm, the tolerance is ±0.07mm; for thicknesses between 1mm and 1.2mm, the tolerance is ±0.08mm, and so on.
- Width tolerance: Generally within ±5mm.
- Length tolerance: Usually within ±10mm, but the specific tolerance range may vary depending on the manufacturer and customer requirements.
Mechanical Properties
| Grade | Coating | Standard | Yield strength Re (MPa) | Tensile strength Rm (MPa) | Elongation A80 (min %) | r90 (min) | n90 (min) |
|---|---|---|---|---|---|---|---|
| DX51D | Z, ZA, ZF | EN 10346 | - | 270 – 500 | 22 | - | - |
| DX52D | Z, ZA, ZF | EN 10346 | 140 – 300 ²) | 270 – 420 | 26 | - | - |
| DX53D | Z, ZA, ZF | EN 10346 | 140 – 260 | 270 – 380 | 30 | - | - |
| DX54D | Z, ZA, ZF | EN 10346 | 120 – 220 | 260 – 350 | 36 | 1.6 ⁴) | 0.18 |
| DX56D | Z, ZA, ZF | EN 10346 | 120 – 180 | 260 – 350 | 39 | 1.9 ⁵) | 0.21 ⁵) |
| DX57D | Z, ZA | EN 10346 | 120 – 170 | 260 – 350 | 41 | 2.1 ⁵) | 0.22 |
FAQ:
1. How long does DX51D galvanized steel resist corrosion?
Answer: Service life depends on zinc coating weight and environment. With Z275 coating, DX51D can provide 20–40 years of corrosion protection in normal atmospheric conditions.
2. Can DX51D galvanized steel be painted or coated?
Answer: Yes. DX51D is suitable for painting, powder coating, and color coating after proper surface preparation.
3. What coil weights are commonly supplied?
Answer: Standard coil weight ranges from 3–8 tons, with customization available based on customer handling requirements.
4. What are the packaging methods for DX51D steel coil?
Answer: Standard export packing includes steel strips, waterproof paper, inner & outer protective covers, and wooden or steel pallets.
5. Is DX51D galvanized steel suitable for outdoor use?
Answer: Yes. Its zinc coating provides excellent corrosion protection, making it ideal for outdoor construction and infrastructure projects.