S250GD Steel Grades
Durable Hot-Dip Galvanized Steel for Construction, Manufacturing, and Structural Applications
- Technical Support
S250GD Steel Technical Specifications & Applications
S250GD is a hot-dip galvanized structural steel grade compliant with EN 10346, featuring a minimum yield strength of 250 MPa. It offers an optimal balance of 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, S250GD meets international standards, ensuring reliable performance in galvanized and structural steel applications.
As a core product of Hengze Steel Group, S250GD 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
S250GD is a hot-dip galvanized structural steel grade compliant with EN 10346, featuring a minimum yield strength of 250 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), S250GD 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 S250GD 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 %)
| Steel Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Aluminum (Al) |
|---|---|---|---|---|---|---|
| S250GD | ≤ 0.20 | ≤ 1.70 | ≤ 0.10 | ≤ 0.045 | ≤ 0.60 | — |
2. Mechanical Property Requirements (Maximum Values)
| Steel Grade | Min. Yield Strength (MPa) | Min. Tensile Strength (MPa) | Min. Elongation (%) Lo=80mm | Bend Angle (°) | Mandrel Diameter (× Thickness t) |
|---|---|---|---|---|---|
| S250GD | ≥ 250 | ≥ 330 | ≥ 19 | 90 | 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. S250GD vs S280GD — What’s the Difference?
| Property | S250GD Steel | S280GD Steel |
|---|---|---|
| Yield Strength | ≥ 250 MPa | ≥ 280 MPa |
| Tensile Strength | 330–450 MPa | 360–510 MPa |
| Elongation (80mm) | ≥ 19% | ≥ 18% |
| Bendability | 180° with 6t mandrel | 180° with 6t mandrel |
S250GD Steel FAQ：
S250GD steel exhibits a minimum yield strength of 250 MPa, a minimum tensile strength of 330 MPa, and an elongation of at least 19% at 80 mm gauge length. These properties ensure its suitability for various structural applications.
S220GD steel exhibits a minimum yield strength of 220 MPa, a tensile strength ranging from 300 to 440 MPa, and an elongation at break of at least 20%. These properties ensure reliable structural integrity and formability for various applications.
S250GD offers multiple metallic coatings to enhance durability and corrosion resistance:
Z (Zinc): Basic corrosion protection for general environments.
ZA (Zinc-Aluminium): Improved corrosion resistance over pure zinc.
ZF (Zinc-Iron): Increased hardness and wear resistance.
ZM (Zinc-Magnesium): Superior protection in coastal or high-corrosion areas.
AZ (Aluminium-Zinc): Excellent corrosion resistance with heat reflectivity.
AM (Aluminium-Magnesium): High corrosion resistance for high-temperature or harsh conditions.
These coatings extend the service life of steel in roofing, cladding, and structural applications.
S250GD is widely applied in sectors requiring durable, galvanized steel solutions:
Construction: Roof panels, wall cladding, structural frameworks, safety barriers.
Automotive: Vehicle body panels, chassis reinforcements, underbody protection.
Appliances: Housing for washing machines, refrigerators, air conditioners, microwaves.
Electrical & Industrial: Cable trays, electrical enclosures, transformer housings, conduit systems.
Its combination of strength, corrosion resistance, and formability makes it ideal for both industrial and civil engineering projects.
