What Is DX51D?
DX51D is a steel grade designation for galvanized steel coils. The "DX" part indicates the base material. When the base material is cold-rolled steel, it corresponds to the dc01 grade; when the base material is hot-rolled steel, it corresponds to the DD11 grade. The "51" represents the steel series number, indicating that this steel is based on low-carbon steel, with 51 being the most common grade, and higher grades include 52, 53, and 54. The final "D" indicates that the material has good bending and forming properties.
Galvanizing products are widely used in industry, agriculture, animal husbandry and fishery, energy, transportation, chemical industry, light industry, home appliances, construction, communications, national defense and other fields.
Product Parameters
|
Product Name |
DX51D Z150 Galvanized Sheet |
|
Thickness |
0.12mm-6.00mm |
|
Width |
600mm-1500mm |
|
Length |
1m-12m, Support Customization |
|
Standard |
AISI, ASTM, DIN, JIS, GB, JIS, SUS, EN, etc. |
|
Zinc Layer |
Hot Galvanizing: 60-275g/m² |
|
Pre-galvanized: 80-275g/m² |
Chemical Composition
|
Standard |
Grade |
C |
Si |
Mn |
P |
S |
Ti |
|
Forcold Forming Chinese Standard |
DX51D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
DX52D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX53D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX54D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX56D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX57D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
Forcold Forming Japanese Standard |
SGCC |
0.15 |
0.50 |
0.80 |
0.050 |
0.030 |
0.025 |
|
SGCD1 |
0.12 |
0.50 |
0.60 |
0.040 |
0.030 |
0.025 |
|
|
SGCD3 |
0.08 |
0.50 |
0.45 |
0.030 |
0.030 |
0.025 |
|
|
SGCD4 |
0.06 |
0.50 |
0.45 |
0.030 |
0.030 |
0.025 |
|
|
For Structure Japanese Standard |
SGC340 |
0.25 |
0.50 |
1.70 |
0.200 |
0.035 |
0.025 |
|
SGC400 |
0.25 |
0.50 |
1.70 |
0.200 |
0.035 |
0.150 |
|
|
SGC490 |
0.30 |
0.50 |
2.00 |
0.200 |
0.035 |
0.025 |
|
|
SGC510 |
0.30 |
0.50 |
2.50 |
0.200 |
0.035 |
0.025 |
|
|
For Structure AISI Standard |
S220GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
S250GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
|
S280GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
|
S320GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
|
S350GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.150 |
|
|
S550GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.150 |
Performance in Different Environments
1. Indoor Applications
For indoor construction, manufacturing, and storage environments where humidity is low, Z100 to Z180 coatings are sufficient. DX51D galvanized steel maintains structural integrity and resists minor moisture exposure, making it ideal for HVAC ducts, cabinets, and interior panels.
2. General Outdoor Applications
For general outdoor use, such as roofing, wall cladding, fencing, and light structural elements, Z180 to Z275 coatings are recommended. These coatings provide long-term protection against rain, sunlight, and moderate environmental pollution.
3. Coastal and Marine Environments
Saltwater, high humidity, and strong winds can accelerate corrosion. In such cases, Z275 to Z350+ coatings are necessary to protect DX51D steel structures, including bridges, piers, coastal roofing, and outdoor machinery housings.
4. Industrial and High-Corrosion Zones
Factories, chemical plants, and industrial complexes often contain acidic or corrosive atmospheres. For these harsh environments, Z350+ or higher coating grades are essential to ensure maximum durability and minimize maintenance costs.
DX51D's elongation and tensile properties enable high repeatability in manufacturing without cracking or coating delamination.
Choosing the right galvanized steel ensures efficient production and stable final product quality. That is why GNEE STEEL prioritizes coating adhesion tests and partner feedback loops - helping customers reduce scrap rate and production variations through consistent DX51D galvanized supplies.
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Mechanical Properties of DX Grades (EN 10346)
| 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 | 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 | 0.18 |
| DX56D | Z, ZA, ZF | EN 10346 | 120 - 180 | 260 - 350 | 39 | 1.9 | 0.21 |
| DX57D | Z, ZA | EN 10346 | 120 - 170 | 260 - 350 | 41 | 2.1 | 0.22 |
FAQ：
1. How can the zinc coating thickness be checked?
Answer: Coating thickness can be measured using magnetic thickness gauges or X-ray equipment, and verified through coating weight markings such as Z100, Z180, or Z275.
2. What surface finishes are available for DX51D galvanized steel?
Answer: Available surface finishes include regular spangle, minimized spangle, zero spangle, oiled, dry, chromated, and anti-fingerprint.
3. What is the yield strength of DX51D galvanized steel?
Answer: The typical minimum yield strength of DX51D is 140 MPa, with tensile strength usually between 270–500 MPa.
4. 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.
5. Can DX51D galvanized steel be painted or coated?
Answer: Yes. DX51D is suitable for painting, powder coating, and color coating after proper surface preparation.