Hot-dip galvanized steel S320GD
Hot-dip galvanized steel S320GD in accordance with the EN 10346 standard is a high-strength structural steel specially designed for demanding applications in structural engineering and building construction. With the material number 1.0250, S320GD has a minimum yield strength Rp0.2 of 320 N/mm² and is therefore one of the steels in the higher strength classes. Hot-dip galvanizing in accordance with EN 10346 ensures that a homogeneously applied zinc coating permanently protects the base material against corrosion. The available coatings +Z, +ZF, +ZA, +ZM, +AZ and +AS allow targeted adaptation to different environmental conditions and mechanical stresses, which means that S320GD achieves exceptional durability and cost-effectiveness in construction projects.
S320GD Galvanized Steel Coil Mecahmical Properties
| Property | Value |
| Tensile Strength (Rm) | 290 – 390 MPa |
| 0.2% Proof Strength (Rp0.2) | ≥ 320 MPa |
| Minimum Elongation (Lo = 80 mm) (A) | ≥ 17% |
S320GD Galvanized Steel Coil Chemical Composition
| Element | Maximum Content (%) |
| Carbon (C) | 0.2 |
| Silicon (Si) | 0.6 |
| Manganese (Mn) | 1.7 |
| Phosphorus (P) | 0.1 |
| Sulfur (S) | 0.045 |
Note:
The minimum elongation requirement varies with thickness:
- 0.5 mm < t ≤ 0.7 mm: The minimum elongation is reduced by 2% compared to the listed value.
- 0.35 mm < t ≤ 0.5 mm: The minimum elongation is reduced by 4% compared to the listed value.
- t ≤ 0.35 mm: The minimum elongation is reduced by 7% compared to the listed value.
The tensile strength range for this grade can vary by up to 140 MPa, depending on processing conditions and coating specifications.
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 |
Frequently Asked Questions (FAQ)
Q: What is the S320GD grade in structural steels?
A: The S320GD grade refers to a type of coated structural steel with a yield strength of at least 320 MPa, commonly used for its good strength and formability. It is often utilized in a range of industries, including construction and manufacturing.
Q: How is S320GD steel typically coated?
A: S320GD steel is commonly coated through a continuous hot-dip process, using materials like zinc or a zinc-iron alloy (ZF) for corrosion protection. This coating enhances the steel's durability in harsh environments.
Q: What are the common applications of S320GD steel?
A: S320GD steel is widely used in constructing roofs, enclosures, and other structural components due to its good weldability, strength, and corrosion resistance. Its high-quality finish makes it suitable for both visible and structural applications.
Q: What are the dimensional specifications for S320GD steel coils?
A: S320GD steel coils are available in various thicknesses, typically ranging from 0.35 mm to 0.50 mm. These coils are produced to meet specific industry standards and dimensional requirements.
Q: How does the zinc coating on S320GD steel improve its properties?
A: The zinc coating on S320GD steel provides better corrosion resistance, significantly enhancing the steel's longevity and performance in harsh environments. This is crucial for maintaining the integrity of structures exposed to the elements.
Q: What standards govern the production of S320GD steel?
A: The production of S320GD steel is regulated by standards such as EN 10147, which specify the chemical composition, mechanical properties, and coating requirements to ensure consistent quality and performance.
Q: Can S320GD steel be used for welding applications?
A: Yes, S320GD steel offers good weldability, making it suitable for various welding applications in construction and manufacturing. Its low-carbon content and specific alloying elements facilitate welding processes.
