S350GD Steel Grades
High-Strength Hot-Dip Galvanized Steel for Structural and Industrial Applications
- Technical Support
S350GD Steel Technical Specifications & Applications
S350GD is a high-strength, hot-dip galvanized structural steel grade compliant with EN 10346, offering a minimum yield strength of 350 MPa. It combines 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, S350GD meets international standards, ensuring reliable performance in galvanized and structural steel applications.
As a core product of Hengze Steel Group, S350GD 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
S350GD is a high-strength hot-dip galvanized structural steel grade compliant with EN 10346, featuring a minimum yield strength of 350 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), S350GD 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 S350GD 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 %)
| Element | Max. Content (%) |
|---|---|
| Carbon (C) | ≤ 0.20% |
| Silicon (Si) | ≤ 0.60% |
| Manganese (Mn) | ≤ 1.70% |
| Phosphorus (P) | ≤ 0.10% |
| Sulfur (S) | ≤ 0.045% |
2. Mechanical Property Requirements (Maximum Values)
| Property | Value |
|---|---|
| Minimum Yield Strength (Rp₀.₂) | ≥ 350 MPa |
| Tensile Strength (Rm) | 420–560 MPa |
| Minimum Elongation (A₈₀) | ≥ 16% |
| Bend Angle | 90° |
| Mandrel Diameter (× Thickness t) | 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. S350GD vs S390GD — What’s the Difference?
| Property | S350GD Steel | S380GD Steel |
|---|---|---|
| Yield Strength (Rp₀.₂) | ≥ 350 MPa | ≥ 380 MPa |
| Tensile Strength (Rm) | 420–550 MPa | 470–600 MPa |
| Elongation (A₈₀) | ≥ 16% | ≥ 14% |
| Bendability | 180° with 6t mandrel | 180° |
S350GD Steel FAQ：
S350GD is a high-strength, hot-dip galvanized structural steel grade conforming to EN 10346. It has a minimum yield strength of 350 MPa and combines excellent formability, corrosion resistance, and weldability, making it ideal for demanding structural and industrial applications.
S350GD exhibits superior mechanical performance for structural use:
Yield Strength (Rp₀.₂): ≥ 350 MPa
Tensile Strength (Rm): 420–560 MPa
Elongation (A₈₀): ≥ 16%
These properties ensure high load-bearing capacity while maintaining good formability.
S350GD is widely used in:
Construction: Structural framing, roofing, and wall cladding
Automotive Industry: Reinforcement components and body panels
Industrial Equipment & Appliances: Durable exterior panels and fabricated structures
Its combination of strength, corrosion resistance, and formability makes it suitable for both light and heavy-duty applications.
S350GD offers several advantages for structural and industrial projects:
Enhanced Durability: Zinc coating provides long-term corrosion protection
High Strength: Supports heavy structural loads with reliability
Excellent Formability: Compatible with bending, stamping, roll-forming, and welding operations
These attributes make S350GD a preferred choice for high-performance, long-lasting steel solutions.
