S280GD Steel Grades
High-Performance Hot-Dip Galvanized Steel for Construction and Structural Applications
- Technical Support
S280GD Steel Technical Specifications & Applications
S280GD is a hot-dip galvanized structural steel grade compliant with EN 10346, offering a minimum yield strength of 280 MPa. It provides an optimal balance of strength, formability, and corrosion resistance, making it suitable for various applications in construction and manufacturing.
This steel grade is widely used in structural framing, purlins, and heavy-duty roll-formed sections. Its excellent weldability and cold-forming properties allow for efficient processing in bending, cutting, stamping, and roll-forming operations.
Manufactured under stringent quality controls, S280GD meets international standards, ensuring reliable performance in galvanized and structural steel applications.
As a core product of Hengze Steel Group, S280GD is trusted globally for durable, high-performance galvanized structural steel solutions in construction, engineering, and manufacturing sectors.
Table of Contents
1. Typical Uses & Selection Guidance
- Structural Applications S280GD is a hot-dip galvanized structural steel grade compliant with EN 10346, featuring a minimum yield strength of 280 MPa. It offers an optimal balance of strength, formability, and corrosion resistance, making it suitable for various applications in construction and manufacturing.
- Corrosion Protection When hot-dip galvanized or metallic-coated (Zinc, Zinc-Aluminium), S280GD provides reliable corrosion resistance for roofing, wall cladding, gutters, and general building applications, particularly in mild to moderate environments. The zinc coating offers a robust barrier against corrosion, extending the life of the steel.
- Forming Advantages The higher yield strength of S280GD allows for easier bending, tighter radii, and reduced risk of cracking, making it ideal for complex profiles, detailed fabrication, and applications requiring superior formability.
2. Technical Specifications Table
1. Chemical Composition Requirements (Maximum %)
| Steel Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Aluminum (Al) |
|---|---|---|---|---|---|---|
| S280GD | ≤ 0.20% | ≤ 1.70% | ≤ 0.10% | ≤ 0.045% | ≤ 0.60% | — |
2. Mechanical Property Requirements (Maximum Values)
| Steel Grade | Min. Yield Strength (MPa) | Min. Tensile Strength (MPa) | Min. Elongation (%) Lo=80mm | Bend Angle (°) | Mandrel Diameter (× Thickness t) |
|---|---|---|---|---|---|
| S280GD | ≥ 280 | ≥ 360 | ≥ 18 | 90 | 6t |
3. Coating Adhesion (180° Bend Test) Requirements
| Coating Class | Mandrel Diameter (× Thickness t) |
|---|---|
| Z100, Z200 | 1t |
| Z275, Z350, Z450, AZ150, AZ200, AM100, AM125, AM150, AM175, AM200, AM225 | 2t |
| Z600 | 3t |
4. Applicable Hot-Dip Metallic Coating Types
| Coating Class | Composition (%) | Key Features |
|---|---|---|
| Z (Zinc) | ≥99% Zinc | Basic corrosion protection; suitable for general use. |
| ZA (Zinc-Aluminium) | 95% Zn, 5% Al | Improved corrosion resistance over pure zinc. |
| ZF (Zinc-Iron) | Zinc with iron alloy | Enhanced hardness and wear resistance. |
| ZM (Zinc-Magnesium) | Zn with 2–4% Mg, 5–13% Al | Superior corrosion resistance in harsh environments. |
| AZ (Aluminium-Zinc) | 55% Al, 43.5% Zn, 1.5% Si | Excellent corrosion resistance and heat reflectivity. |
| AM (Aluminium-Magnesium) | Al with Mg alloy | High corrosion resistance; suitable for high-temperature applications. |
3. S280GD vs S320GD — What’s the Difference?
| Property | S280GD Steel | S320GD Steel |
|---|---|---|
| Yield Strength | ≥ 280 MPa | ≥ 320 MPa |
| Tensile Strength | 360–510 MPa | 390–510 MPa |
| Elongation (80mm) | ≥ 18% | ≥ 17% |
| Bendability | 180° with 6t mandrel | 180° with 6t mandrel |
S280GD Steel FAQ：
S280GD is a non-alloy structural steel with a minimum yield strength of 280 MPa, making it suitable for load-bearing applications. It offers excellent corrosion resistance due to its hot-dip galvanized coating and is commonly used in construction and manufacturing. The steel is available in various coatings, including Z (zinc), ZF (zinc-iron), ZA (zinc-aluminium), AZ (aluminium-zinc), and AS (aluminium-silicon), each providing specific benefits for different environmental conditions.
S280GD is widely used in structural framing, purlins, and heavy-duty roll-formed sections. Its excellent weldability and cold-forming properties allow for efficient processing in bending, cutting, stamping, and roll-forming operations. The steel's corrosion resistance makes it suitable for various applications in construction and manufacturing.
S280GD galvanized steel, especially the version with +AZ (aluminium-zinc) coating, performs well in high-temperature environments and maintains structural integrity. The aluminium-zinc coating offers superior corrosion resistance and heat reflectivity, making it ideal for applications exposed to elevated temperatures.
S280GD+Z275 galvanized steel, with a 275 g/m² zinc layer, provides excellent corrosion resistance and can be used in outdoor environments for more than 20 years. The longevity depends on factors such as environmental conditions and maintenance practices. SteelPRO Group's strict quality control ensures its long-term stability in a variety of environments.
