Hot-dip galvanized steel
Hot-dip galvanized steel S280GD in accordance with the EN 10346 standard is a high-quality structural steel that has been specially developed for use in structural engineering and building construction. With the material number 1.0244, S280GD has a minimum yield strength Rp0.2 of 280 N/mm² and thus joins the higher strength classes of galvanized structural steels. Hot-dip galvanizing in accordance with EN 10346 guarantees a uniform zinc coating on the steel surface, which effectively protects the base material against corrosion. Thanks to the various coating systems (+Z, +ZF, +ZA, +ZM, +AZ and +AS), the material can be precisely adapted to different climatic and mechanical stresses.
The name S280GD is derived from European standard EN 10346 and stands for:
- S: Structural grade steel.
- 280: Minimum yield strength of 280 MPa.
- GD: Suitable for continuous hot-dip galvanization.
Specifications Table
| Quality | Standard | Material No. | Available coatings |
|---|---|---|---|
| S280GD | DIN EN 10346 | 1.0244 | +Z, +ZF, +ZA, +ZM, +AZ, +AS |
| Testing direction | Yield strengthRP02 (MPa) |
Tensil Strength Rm (MPa) |
Elongation A80 (in %) |
|---|---|---|---|
| L | ≥ 280 | ≥ 360 | ≥ 18 |
| C % |
Si % |
Mn % |
P % |
S % |
|---|---|---|---|---|
| ≤ 0,20 | ≤ 0,60 | ≤ 1,70 | ≤ 0,10 | ≤ 0,045 |
S280GD Steel Equivalent Grades
Under EN10346:2015, the equivalent grade for S280GD is 1.0244.
Additional Equivalent Materials (for reference only):
EN 10346: 1.0244
DIN 17162: StE280-3Z
ASTM A653: Grade 40 (structural)
JIS G3302: SGCC (structural use)
S280GD Steel Properties
High Corrosion Resistance:
The hot-dip galvanizing process creates a durable zinc coating that effectively prevents rust, ensuring the steel can withstand prolonged exposure to humidity and wet conditions.
Enhanced Structural Stability:
S280GD maintains its mechanical performance under both static and dynamic loads, making it reliable for load-bearing frameworks and dynamic structures like bridges and cranes.
Excellent Formability:
This steel grade can be easily shaped into complex components such as roofing profiles, wall cladding, and structural panels without cracking or losing surface quality.
Strong Coating Adhesion:
The zinc coating is tightly bonded to the steel surface, ensuring long-term corrosion protection even after cutting, bending, or forming.
Outstanding Weather Resistance:
S280GD resists environmental wear in harsh climates, including prolonged exposure to rain, snow, and temperature fluctuations, ensuring a consistent performance over time.
High Heat Reflectivity and Insulation Capability:
Its surface can reflect a significant amount of radiant heat, helping to maintain stable interior temperatures in structures and making it an effective material for energy-efficient roofing or insulation.
S280GD Galvanized Steel Applications
- Building and Construction: Roofing sheets, wall cladding, structural panels, siding, and light framing components.
- Automotive Industry: Exterior body panels, inner reinforcements, undercarriage parts, and structural beams.
- HVAC Systems and Ductwork: Ventilation ducts, air conditioning units, exhaust systems, and heating panels.
- Consumer Appliances: Washing machine drums, refrigerator doors, oven liners, and microwave casings.
- Industrial Equipment: Storage tanks, light industrial frameworks, agricultural machinery parts, and container panels.
Zinc Thickness
| Zinc Coating Grade | Zinc Coating (g/m²) | Corrosion Resistance | Typical Applications | Remarks |
| Z30 | 30 | Very low | Indoor parts, home appliance inner panels, ventilation ducts | Not suitable for outdoor use |
| Z60 | 60 |
Low |
Indoor structures, temporary facilities | Low cost |
| Z80 | 80 | Medium | Light steel structures, base metal for PPGI | Good cost performance |
| Z100 | 100 | Medium | PPGI, fencing, general construction
|
Common export grade |
| Z120 | 120 | Medium-High |
|
Longer service life |
| Z140 | 140 | Medium-High | Industrial buildings, agricultural facilities | Suitable for outdoor use |
| Z180 | 180 | High | Long-term outdoor structures, equipment housings
|
Recommended for outdoor use |
| Z200 | 200 | Very high | Humid environments, heavy structures
|
Higher cost |
| Z275 | 275 | Excellent
|
Coastal areas, solar mounting systems, high-corrosion environments | High standard |
- Spangle
The "spangle" is a type of surface morphology found on hot-dip galvanized (pure zinc-coated) steel coils. When the steel strip passes through the zinc pot, its surface becomes coated with liquid zinc. As the zinc layer naturally solidifies, zinc grains nucleate and grow, forming what is known as "spangle."
The name "spangle" comes from the fact that the complete zinc crystals display a snowflake-like pattern, which is quite vivid and descriptive.
Available Steel Grade
|
Grade |
Yield Strength MPa≥ |
Tensile Strength MPa≥ |
Elongation A%≥ |
|
DX51D Z/ZM/AZ/AM |
240-380 |
270-500 |
22 |
|
DX52D Z/ZM/AZ/AM |
140-300 |
270-420 |
26 |
|
DX53D Z/ZM/AZ/AM |
140-260 |
270-380 |
30 |
|
DX54D Z/ZM/AZ/AM |
120-220 |
260-350 |
36 |
|
S220GD Z/ZM/AM |
220 |
300 |
20 |
|
S250GD Z/ZM/AZ/AM |
250 |
330 |
19 |
|
S280GD Z/ZM/AM |
280 |
360 |
18 |
|
S300GD A/AM |
300 |
380 |
18 |
|
S320GD Z/ZM/AM |
320 |
390 |
17 |
|
S350GD Z/ZM/AZ/AM |
350 |
420 |
16 |
|
S450GD A/AM |
450 |
480 |
15 |
|
S550GD Z/ZM/AZ/AM |
550 |
550 |
- |
FAQ：
What is the typical tensile strength?
Minimum tensile strength is around 360 MPa.
What is the minimum elongation?
Minimum elongation A80 is typically 18 % (varies slightly with thickness).
What thicknesses are available for S280GD sheet/coils?
Thickness can range from about 0.12 mm up to 6.0 mm or more upon request.
Can S280GD be supplied with customized widths and lengths?
Yes - widths (e.g., 600–2000 mm) and lengths/coils can be customized.
What types of galvanization processes are used?
It supports hot-dip galvanizing, electro-galvanizing, and pre-galvanizing.
How thick can the zinc coating be?
Zinc coating weights typically range from Z30 to Z600 g/m² double-sided.