Galvanized steel
Looking for detailed specifications of S350GD steel for your structural project? You've come to the right place. As a direct steel factory with over 15 years of experience, GNEE Steel supplies EN 10346-compliant S350GD galvanized steel plates with clear, standardized specifications. In this guide, we'll break down its chemical composition, mechanical properties, dimensional ranges, and coating standards to help you verify compliance and suitability.
Galvanized steel plates
S350GD steel is a high-strength structural steel grade, often supplied as galvanized plates (with a zinc coating) for enhanced corrosion resistance. It belongs to the EN 10346 standard family, alongside grades like S280GD and S320GD-with S350GD offering the highest yield strength among these common structural grades.
Widely used in construction, automotive, and machinery industries, S350GD steel balances strength and formability, making it ideal for load-bearing parts like beams, chassis, and frames that require both durability and processing flexibility.
Chemical Composition Specifications of S350GD Steel
The chemical composition of S350GD steel directly determines its strength, weldability, and formability. GNEE Steel strictly adheres to EN 10346 standards, with the following controlled element ranges:
| Element | Content (%) | Max/Min Requirement | Role in S350GD Steel Performance |
|---|---|---|---|
| Carbon (C) | ≤0.12 | Max 0.12 | Ensures high strength without excessive brittleness; maintains weldability |
| Manganese (Mn) | ≤1.60 | Max 1.60 | Enhances tensile strength and toughness; improves cold-forming ability |
| Phosphorus (P) | ≤0.035 | Max 0.035 | Minimized to prevent cold cracking during welding and bending |
| Sulfur (S) | ≤0.030 | Max 0.030 | Reduced to avoid corrosion pits and improve surface quality |
| Silicon (Si) | ≤0.50 | Max 0.50 | Boosts strength and enhances adhesion of the zinc coating (for galvanized versions) |
| Aluminum (Al) | ≥0.020 | Min 0.020 | Controls grain size for consistent mechanical properties across the material |
All batches of GNEE's S350GD steel include a mill test certificate (MTC) with actual chemical analysis data, ensuring traceability and compliance.
Mechanical Property Specifications of S350GD Steel
Mechanical properties are critical for structural applications-S350GD steel's specifications are designed to meet heavy-load and safety requirements. Below are the standard and actual performance ranges for GNEE's S350GD galvanized steel plates:
| Mechanical Property | EN 10346 Standard Requirement | GNEE Steel Actual Performance | Test Method |
|---|---|---|---|
| Yield Strength (Rp0.2) | ≥350 MPa | 360-400 MPa | EN ISO 6892-1 |
| Tensile Strength (Rm) | 410-550 MPa | 420-540 MPa | EN ISO 6892-1 |
| Elongation (A80mm) | ≥17% | 18-22% | EN ISO 6892-1 |
| Impact Energy (0℃) | ≥27 J | ≥30 J | EN ISO 148-1 |
| Bending Performance | Pass (180° bend, r=1.5×thickness) | Pass (180° bend, r=1.5×thickness) | EN ISO 7438 |
Key highlights:
The minimum yield strength of 350 MPa ensures S350GD steel can withstand heavy static and dynamic loads.
Elongation above 17% allows for cold forming (e.g., bending, stamping) without cracking-critical for complex structural parts.
High impact energy at 0℃ ensures performance in low-temperature environments, such as northern construction projects.
Dimensional Specifications of S350GD Galvanized Steel Plates
GNEE Steel offers S350GD galvanized steel plates in a wide range of dimensions, with strict tolerances to ensure compatibility with standard construction and manufacturing processes.
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Standard Thickness and Width Ranges
| Thickness Range | Tolerance (±mm) | Width Range | Tolerance (±mm) | Typical Application |
|---|---|---|---|---|
| 2.0-4.0mm | 0.05 | 1250-1500mm | 2.0 | Light structural parts, automotive components |
| 4.0-8.0mm | 0.08 | 1500-2000mm | 3.0 | Medium-load beams, machinery frames |
| 8.0-12.0mm | 0.10 | 1500-2000mm | 3.0 | Heavy support structures, marine parts |
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Length Options and Customization
Standard lengths: 3000mm, 4000mm, 6000mm, 8000mm (with length tolerance ±5mm).
Custom lengths: Available from 2000mm to 12000mm (minimum order quantity: 5 tons for custom lengths).
Precision cutting: CNC cutting services for complex shapes (e.g., rectangular blanks, notched plates) with tolerance ±0.5mm.
Zinc Coating Specifications for S350GD Galvanized Steel
For S350GD galvanized steel plates, the zinc coating specification is a key factor in corrosion resistance. GNEE Steel offers two common coating grades to meet different environment needs:
| Coating Grade | Total Zinc Coating Weight (g/m²) | Coating Thickness (μm) | Salt Spray Test Result | Suitable Environment |
|---|---|---|---|---|
| Z140 | ≥140 | ≥20 | No red rust for ≥600h | Urban inland areas, indoor use |
| Z275 | ≥275 | ≥38 | No red rust for ≥1200h | Coastal areas, outdoor heavy-duty use |
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Additional Coating Requirements
Adhesion: After 180° bending (radius = 1.5×thickness), the coating must not peel or crack (tested per EN ISO 20462).
Surface finish: Uniform silver-gray appearance, free of defects like zinc spangles, dents, or scratches (surface quality class: A per EN 10346).
Passivation option: Optional chromate passivation coating for extra corrosion resistance in high-humidity environments.
The specifications of S350GD galvanized steel-from chemical composition and mechanical properties to dimensions and coating standards-are designed for high-strength, durable structural applications. GNEE Steel's products fully comply with EN 10346, providing consistent quality and reliability for construction, automotive, and machinery projects.
If you need to verify specific specifications for your project, or require customized dimensions of S350GD galvanized steel plates, our team is ready to assist. Contact GNEE Steel now to request a detailed MTC sample, get a personalized quotation, or discuss your S350GD steel specification needs!
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