Wanzhi Group provides high-strength hot-dip galvanized steel solutions with zinc coatings such as S350GD+Z275 Z100 Z140 Z200 for construction, industry, and automotive manufacturing.
What is S350GD+Z275?
S350GD+Z275 is a common steel grade that refers to a hot-dip galvanized structural steel with a minimum yield strength of 350 MPa and a zinc coating of 275 grams per square meter. This steel is used in many applications where high strength and excellent corrosion protection are required, such as automotive parts, building structures, roofing materials, etc.
S350GD
- S stands for Structural Steel. 350 indicates the minimum yield of the steel.
- 350 means that the steel has a minimum yield strength of 350 MPa (megapascals, megabulls per square millimeter), which is the maximum stress that the steel can withstand before deformation.
- GD means that the steel is Galvanized Steel, i.e. the surface of the steel has been hot-dip galvanized to improve its corrosion resistance.
Z275
Z denotes that the steel is galvanized. 275 denotes a mass of 275 grams of zinc per square metre of steel surface, which means that 275 grams of zinc per square metre of steel plate are coated to provide better corrosion protection.
| Characteristics | Parameters | Advantages |
|---|---|---|
| Coating weight | 275 g/m² (both sides) | High corrosion resistance for harsh environments |
| Salt spray test life | ≥1000 hours without red rust | More durable than normal galvanizing (Z140) |
| Surface treatments | Chromated / Chrome-free passivation | Enhanced coating adhesion, environmentally friendly compliant |
Mechanical Properties (EN 10346)
| Performance Indicators | Parameters | Test Standards |
|---|---|---|
| Yield strength (Rp0.2) | ≥350 MPa | ISO 6892-1 |
| Tensile strength (Rm) | 420-550 MPa | ISO 6892-1 |
| Elongation (A80) | ≥14% (thickness ≤3 mm) | ISO 6892-1 |
| Hardness (HV) | 130-210 HV | ISO 6507 |
| Flexural properties | Cold bending at 180° without cracking | ISO 7438 |
Execution standards
- EN 10346 (European Standard)
- ASTM A653 (American Standard equivalent grade: G90, but with different mechanical properties)
S350GD+Z275 for Sale
Wanzhi Group provides high-quality hot-dip galvanized steel for architectural and industrial applications, with thickness, width, length, zinc coating, galvanizing process, and surface finish customized to meet the needs of each application. In addition, we also have
G30 Galvanized Steel
G60 Galvanized Steel
SGCC Galvanized Steel Coil
Q235 Galvanized Steel
Galvanized Steel G90
z275 Galvanized Steel for Sale
Popular Materials
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 |
Case
S350GD+Z275 vs DX51D +Z275
| Comparative items | S350GD+Z275 | DX51D+Z275 |
|---|---|---|
| Standard basis | EN 10346 (Structural steels) | EN 10346 (Cold-formed steels) |
| Substrate type | High-strength microalloyed steel | Low-carbon steel (soft steel) |
| Yield strength (Rp0.2) | ≥350 MPa | ≥140 MPa |
| Tensile strength (Rm) | 420-550 MPa | 270-350 MPa |
| Elongation (A80) | ≥14% (thickness ≤3 mm) | ≥22% (high ductility) |
| Galvanization (Z275) | 275 g/m² on both sides (same corrosion resistance) | 275 g/m² on both sides (same corrosion resistance) |
| Main applications | Load-bearing structures (plants, bridges, truck chassis) | Cold-formed parts (household appliances, light construction, ventilation ducts) |
| Machinability | Pre-drilling/welding required (high-strength steel difficult to press) | Direct pressing and bending possible (mild steel easy to form) |
| Cost | Higher (micro-alloyed composition + high strength) | Lower (ordinary mild steel) |
S350GD+Z275 Hot-Dipped Galvanized Steel Factory
Wanzhi S350GD+Z275 Hot Dipped Galvanized Steel Factory has been certified by ISO9001, ISO14001D, etc. The products are per international standards, such as ASTM, JIS, etc. We can satisfy the customized needs of different sizes, surface treatments, and strength requirements, with a minimum MOQ of 10 tons, and the fastest delivery time of 5 days.
S350GD+Z275 Hot-dip galvanized steel production process
Substrate preparation
- Raw material: Cold rolled steel coils (SPHC, S350GD substrate)
- Cleaning: Alkaline degreasing (60-80°C, pH 10-12) → Hydrochloric acid pickling (concentration 15-20%) → Washing → Drying.
Hot dip galvanizing (key steps)
- Annealing: to eliminate cold rolling stress and improve formability
- Zinc pot galvanizing: zinc layer weight control (Z275=275g/m²±10%)
- Air knife adjustment: to ensure uniform plating without zinc tumors and leakage
- Cooling: to avoid excessive zinc bloom, which will affect the adhesion of subsequent coatings
Post-processing & Inspection
- Passivation: chromate treatment (or environmental protection chrome-free passivation).
- Oiling: anti-rust oil (light or heavy, according to customer’s requirement).
- Inspection: Plating weight. Mechanical properties.
Factory Production Line
Our hot-dip galvanized steel production line is located in Boxing County, Binzhou City, Shandong Province, China, with 2 hot-dip galvanized production lines in the factory and an average monthly production of 10,000 tons. In addition, we have salt spray tests, bending tests, and other quality inspection instruments in our laboratory, contact us for free samples!
Material Certificate
EN 10346
ISO 9001
ISO 14001
RoHS/REACH
Customer Feedback
S350GD+Z275 Advantages and Applications
S350GD+Z275 is the ideal combination of high strength + high zinc coating for corrosion resistant + load bearing applications (e.g. industrial buildings, transportation equipment).
Advantages
✅ Corrosion resistance: the zinc coating weight of 275 grams provides strong protection of the steel against humidity, salt spray, seaside, and acidic environments.
✅ High strength: Yield strength of 350 MPa enables it to withstand high loads.
✅ Machinability: Suitable for stamping, bending, forming, and various welding processes.
✅ Long service life: S350GD+Z275 hot-dip galvanized steel sheet has a longer service life and better durability than ordinary steel.
Applications
✅ Building structure: Roofing of industrial plants and warehouses (wind and corrosion-resistant), fences, guardrails, and enclosures.
✅ Automobile Manufacturing: body structure, bumper beams, truck chassis, trailer parts (high strength + rust resistance).
✅ Agricultural Equipment: Agricultural Machinery, Grain Silos, Farm Fences (Resistant to Moisture, Chemicals).
✅ Power facilities: transmission towers, substation supports (long-term outdoor use).
Need a high-strength load-bearing structural solution? Are looking for a hot-dip galvanized steel solution with high environmental corrosiveness (e.g. seaside, industrial area) and long-term durability? Welcome to contact Wanzhi Group!