Wanzhi Group is a leading manufacturer of quality steel products in accordance with international standards, including high-performance S320GD galvanized steel according to EN 10346. As part of our comprehensive steel portfolio, which includes DX51D galvanized steel, S350GD+Z and S550GD, S320GD+Z has become the preferred choice for structural applications that require high strength-to-weight ratios and excellent durability.
Wanzhi – S320GD Galvanized Steel
S320GD galvanized steel represents hot-dip galvanized structural plate with a minimum yield strength of 320 MPa. Other grades of galvanized steel according to EN 10346, ASTM A653 and JIS G3302 can also be produced. Our state-of-the-art equipment ensures strict compliance with mechanical properties, and surface quality (lace size, smoothness) can be customized to meet aesthetically demanding applications.
Specifications
| Material | SGCC,S350GD+Z,S550GD+Z,DX51D,DX52D,DX53D, etc |
|---|---|
| Thickness | 0.12mm-6mm |
| Width | The conventional width below 0.5mm is 1000mm, 1200mm, and above is 1000, 1250mm |
| coil weight | 8-10 tons /customized |
| Tolerance | "+/-0.02 mm |
| Substrate Type | Hot rolled coil, Cold rolled coil |
| Surface structure | Zero spangles, Small spangles, Regular spangles, Big spangles |
| Zinc layer thickness | 30g/㎡-275g/㎡ (Z275/G90) |
| Standard | AISI, ASTM, BS, GB, JIS |
| Implementation standards | GB/T2518 GB/T25052, EN10346, JIS G3302, ASTMA653 |
| Certificates | SGS, ISO 9001,CE |
Mechanical Properties
| Parameter | Standard Requirement | Typical Value | Testing Standard |
| Yield Strength (Rp0.2) | ≥320 MPa | 340-380 MPa | ISO 6892-1 |
| Tensile Strength (Rm) | 420-540 MPa | 440-500 MPa | ISO 6892-1 |
| Elongation (A80mm) | ≥10% | 12-16% | ISO 6892-1 |
| Bendability (180°) | d=0a | No cracking | ISO 7438 |
| Hardness (HV) | – | 110-150 | ISO 6507 |
Global Standard Grade Comparison
| Property | Europe EN 10346 | China GB/T 2518 | USA ASTM A653 | Japan JIS G3302 |
| Grade | S320GD+Z | S320GD+Z | SS Grade 50 | SGHC490 |
| Yield Strength | ≥320 MPa | ≥320 MPa | ≥345 MPa | ≥490 MPa |
| Coating Symbol | +Z/+AZ/+ZM | +Z/+AZ/+ZM | Type B/G90 | Z12/Z18/Z22 |
S320GD Galvanized Steel Advantages and Applications
S320GD galvanized steel offers high strength, excellent corrosion resistance and machinability for the production of custom cut sheets for structural fabrication, precision strips for automotive components, pre-fabricated roofing/siding systems, OEM profiles for specialized industrial applications and more.
Benefits
Structural Integrity: 320MPa yield strength allows for lighter design weight without compromising load carrying capacity
Corrosion Resistance: Salt spray resistance from 500-2000 hours, with selectable coating thicknesses to suit the application environment, the thicker the coating the better the corrosion resistance.
Durability: 20-50 years against atmospheric corrosion (ISO 9223).
Moldability: S320GD +Z maintains good plasticity despite its higher strength.
Applications
Automotive manufacturing: body cladding, chassis cross members, engine mounts, as well as electromagnetically shielded truck trailer chassis, container corner posts and battery housings for electric vehicles.
Construction: curtain wall keels, roof tiles and structural frames with spans greater than 30 meters, seismic bracing systems and highly loaded mezzanine floors.
Machinery and equipment: equipment housings, supports, conveyor belt frames and heavy machinery requiring fatigue resistance (>106 cycles).
Chemical: chemical tanks, pipelines. Marine: Hull structures, etc.
Renewable Energy Systems: Wind turbine tower internals, solar tracker torque tubes and hydroelectric gate reinforcements.
Specialized infrastructure: cold storage facilities, coastal walkways and industrial flooring systems.
S320GD galvanized steel Manufacturing Excellence
Wanzhi Group is ISO 9001:2015 and ISO 14001:2015 certified, with factory production lines (located in Boxing County, Binzhou City, Shandong Province, China), quality control rooms, sample rooms, etc. We can provide free samples of regular specifications and support third-party testing organizations to inspect goods.
Production Capabilities
- Two continuous galvanizing lines (CGL) with annual capacity 600,000 MT
- Thickness range: 0.12–6.0mm (standard)
- Standard grades: 5-15 days
- Custom orders: 15-45 days
Coating diversity
Value-Added Services
- Surface Treatments: Chromate passivation, phosphating, oiling
- Secondary Processing:Precision slitting (tolerance ±0.1mm)， CNC punching (min. hole Ø 3mm)， Robotic bending (accuracy ±0.5°)，painting (PVDF, SMP, polyester)， Profiling Systems:Trapezoidal roofing/Standing seam systems，etc.
Global Customer Validation – S320GD Galvanized Steel
Our S320GD galvanized steel products have been used in iconic projects in dozens of countries, including structural support for parks in the United Arab Emirates, coastal bridge reinforcement systems in Australia, purlin production in Singapore, and large-span factory buildings in Mongolia.
S320GD+Z，S320GD+AZ, S320GD+ZM Coating Technology
Galvanized, aluminized zinc and magnesium zinc-aluminum are three popular metal-coated steels. The material and thickness of the coating determines the main properties and areas of application. Pure zinc coatings can be used in construction and industrial production, aluminized zinc coatings can be used for solar farms, industrial roofs, heat exchangers, etc., and magnesium zinc-aluminum coatings are suited for all kinds of applications in extreme environments.
| Property | S320GD+Z | S320GD+AZ (Galvalume) | S320GD+ZM (ZAM) |
| Coating Composition | 99.9% Zn | 55% Al, 43.4% Zn, 1.6% Si | 92% Zn, 6% Al, 2% Mg |
| Corrosion Mechanism | Sacrificial protection | Barrier + sacrificial | Self-healing barrier |
| Salt Spray Resistance | 120-250h/µm | 200-400h/µm | 300-600h/µm |
| Thermal Stability | Stable to 200°C | Stable to 315°C | Stable to 400°C |
| Surface Conductivity | 15-20 μΩ·cm | 25-35 μΩ·cm | 20-30 μΩ·cm |
| Forming Limitations | None | Avoid sharp bends | Radius ≥ 2t |
| Welding Compatibility | All methods | Laser/GMAW preferred | Resistance welding |
| Lifecycle Cost | $0.85/kg (20yr) | $0.70/kg (30yr) | $0.65/kg (40yr) |
S320GD + Z VS S550GD+Z Performance Economics
| Parameter | S320GD galvanized steel | S550GD galvanized steel |
| Yield Strength | 320 MPa (design limit) | 550 MPa |
| Elongation | 12-16% | 5-8% |
| Notch Toughness | 40J @ -20°C | 27J @ 0°C |
| Fabrication Cost | $120/T (forming) | $220/T (heating required) |
| Connection Design | Standard bolts (8.8) | HV bolts (10.9) |
| Lifecycle ROI | 4.2 years payback | 6.8 years payback |
| Optimal Use Cases | Weight-critical structures | Ultra-high static loads |
S320GD galvanized steel is 45% stronger than S220GD while retaining 85% formability, making it an optimal solution for conventional steel when its properties are stretched to the limit. Ideal for weight sensitive projects where structural efficiency is desired.