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S250GD Galvanized Steel: Definitions, Properties, and Applications
- John
S250GD galvanized steel from SteelPro Group is a top choice for construction and manufacturing. Its strong zinc coating ensures corrosion resistance and durability.
Keep reading to find out why this galvanized metal is the preferred choice for engineers and constructors alike!
What is S250GD | 1.0242？
S250GD (1.0242) is a structural steel grade under EN 10346, mainly used for galvanized steel. “S” denotes structural steel, “250” indicates the minimum yield strength in MPa, and “GD” signifies its suitability for galvanization. It contains carbon, manganese, and silicon, with stringent limits on sulfur and phosphorus. Common methods include hot-dip and electro-galvanizing, producing galvanized sheets or coils for construction, appliances, and automotive industries.
S250GD Steel Equivalent Grade
| Standard | Equivalent Grade |
| BS | FeE250G |
| ASTM | Grade B (ASTM A 466 M) |
| GB | Q235 |
| JIS | SGC340 |
S250GD | 1.0242 Chemical Composition
| Element | Maximum Content (%) |
| Carbon (C) | 0.2 |
| Manganese (Mn) | 1.7 |
| Silicon (Si) | 0.5 |
| Phosphorus (P) | 0.1 |
| Sulfur (S) | 0.045 |
| Nitrogen (N) | 0.012 |
| Aluminum (Al) | 0.015 |
Impurities like sulfur, phosphorus, and nitrogen reduce S250GD’s performance. Sulfur weakens toughness, causing cracking, while phosphorus increases brittleness. Nitrogen hardens the steel, leading to brittleness over time. SteelPRO Group strictly controls these impurities, ensuring stable quality and improved durability for high-performance applications.
S250GD Steel Mechanical Properties
| Steel Grade | Yield Strength MPa ≥ | Tensile Strength MPa ≥ | After Breakage Percent Elongation % ≥ | Coating Adhesion | |
| Nominal Thickness mm ≤ 0.7 | Nominal Thickness mm > 0.7 | Bending Center Diameter (a = plate thickness) | |||
| S250GD+Z, S250GD+ZF, S250GD+ZA, S250GD+ZM, S250GD+AZ, S250GD+AS | 250 | 330 | 17 | 19 | 1a |
Elongation After Fracture of S250GD
The elongation after break of S250GD varies with thickness. The higher the elongation, the better the ductility of the steel, adapting to various forming processes and not prone to cracking.
- For thicknesses of 0.7 mm or less, the elongation reaches 17% or more.
- For thicknesses greater than 0.7 mm, the elongation increases to 19% or more.
This exceptional ductility ensures our S250GD particularly suitable for processing needs that require high ductility and durability without cracking or breaking during processing.
S250GD Galvanized Steel Advantages
Our S250GD galvanized steel excels in strength, durability and processability, helping customers easily meet various needs in the construction and manufacturing fields with high performance and cost-effectiveness:
- High strength and good stability: S250GD guarantees a yield strength of at least 250 MPa, which can maintain structural stability under high loads, while many similar products are slightly lacking in strength.
- Excellent ductility and suitable for forming: S250GD has a higher elongation after fracture than ordinary steel on the market, and is not easy to crack during the forming process, making it very suitable for complex processing.
- Excellent corrosion resistance: We have optimized the galvanizing process to ensure that the steel can be used for a long time in humid or highly polluted environments, reducing corrosion losses, while other products have a relatively short service life in these environments.
- Good weldability and more convenient construction: It can be easily welded without preheating, saving construction time and cost, while other materials usually require more processes.
- Environmentally sustainable: S250GD has a high recycling rate and meets green manufacturing standards, making it an ideal choice for environmentally friendly projects.
How does S250GD compare to other galvanized steel grades in terms of cost and performance?
S250GD is competitively priced compared to higher grades like S280GD. It offers a balanced performance for general structural applications, making it a cost-effective choice without sacrificing essential strength and durability.
S250GD Galvanized Steel Surface Treatment
S250GD galvanized steel can be treated in a variety of ways to improve its corrosion resistance and appearance. SteelPRO Group offers you a variety of surface treatment options:
S250GD Steel Surface Quality Grades
Depending on the application and surface requirements, S250GD has four surface quality grades:
- FA grade: If your application does not require appearance, such as internal structures or hidden parts, FA grade is sufficient to meet the needs.
- FB grade: For occasions with medium surface requirements, such as mechanical internal parts.
- FC grade: If the steel will be directly displayed, such as for external parts, FC is recommended, with a cleaner and smoother surface.
- FD grade: Best suited for high-quality appearance parts, such as automotive panels or decorative surfaces, with almost no surface defects and excellent visual effects.
S250GD Steel Surface Treatments Types
We offer a variety of surface treatments to meet different protection and aesthetic needs:
- Chromating: If your steel needs to be exposed to humid or corrosive environments for a long time, chromating can significantly improve corrosion resistance.
- Phosphate treatment: suitable for projects that require painting, enhances paint adhesion and ensures a stronger paint surface.
- Oiling: provides temporary anti-rust effect during product storage and transportation, suitable for steel that requires short-term protection.
- Painting: increases both protection and aesthetics. If your project has decorative requirements for the appearance, you can choose painting.
S250GD Galvanized Steel Coating Types
Different coating types can meet various application scenarios. You can choose the appropriate coating according to your needs:
- +Z (zinc): suitable for protection needs in general environments, it is the most basic choice.
- +ZF (zinc-iron alloy): If the project requires welding construction, it is recommended to choose +ZF coating, which has better welding performance.
- +ZA (zinc-aluminum): used for structures exposed to harsh environments, such as outdoor buildings, with excellent anti-corrosion effect.
- +ZM (zinc-magnesium): For applications that require complex molding, +ZM coating can provide better formability.
- +AZ (aluminum-zinc): very suitable for architectural applications such as roofs, both anti-corrosion and anti-oxidation.
- +AS (aluminum silicon): suitable for use in high temperature environments, such as components of industrial heating equipment, with strong heat resistance.
Coating Range Forms of S250GD Steel
| Coating Form | Applicable Surface Structure | Weight Range of Coatings g/m² (A/B) |
| Equally Coating (Zinc Coating\Zn-Fe Alloy Coating) | Z, G, GX, N, R, S, O | 40/40~225/225 |
| Differential Coating b | N, R, S, O | 30~150 (each side) |
The galvanized coating on S250GD steel greatly enhances its corrosion resistance by forming a protective shield against moisture and environmental factors. This ensures durability and reliability across various applications. We take pride in using advanced surface treatments and coatings that further optimize S250GD’s performance, making it the preferred choice for demanding projects across multiple industries.
S250GD Galvanized Steel Processing
If you are concerned about the processing method of S250GD, we provide a variety of processing options to customize the performance and appearance of the steel according to your needs. Here is a brief introduction to the process flow from pre-treatment to post-treatment, so that you can have more confidence in our product processing technology!
1. Pretreatment
- Pickling: Remove rust on the surface of the steel with hydrochloric acid at 60-80°C to prepare for subsequent processing.
- Passivation: Enhance the corrosion resistance of the steel and is suitable for use in humid or corrosive environments.
2. Processing process
- Shearing: Cut the steel into the shape you need through cold cutting.
- Stamping: Thanks to the excellent ductility of S250GD, it can be formed at room temperature, which is very suitable for diverse forming needs.
- Welding: S250GD supports spot welding and arc welding, and does not require preheating, which is convenient for construction and saves costs.
- Bending: We can cold bend, and the bending radius is consistent with the thickness of the steel to avoid cracking during processing.
- Stretch forming: can be stretched into complex shapes without breaking, suitable for projects with special forming requirements.
3. Post-processing
- Coating/painting: further improves corrosion resistance and helps paint adhesion, suitable for applications with aesthetic and protection requirements.
- Rust-proof oil coating: provides short-term rust protection during storage and transportation.
- Anti-fingerprint treatment: reduces surface fingerprints and smudges, suitable for parts with high appearance requirements.
4. Heat treatment (optional)
- Stress relief: if higher toughness is required, the brittleness and internal stress of steel can be eliminated at 500-600℃, which is usually only used when there is a special need.
How does the galvanization process enhance the performance of S250GD?
Our S250GD galvanized steel uses an advanced galvanizing process to form a uniform and strongly adherent zinc layer, which effectively improves corrosion resistance. Even if the surface is scratched, the zinc layer can provide excellent cathodic protection to prevent further corrosion of the steel, making it more durable and reliable in harsh environments.
S250GD Galvanized Steel Products We Provide
Our S250GD is a high-performance steel that is ideal for construction and manufacturing, and our range of plates, coils and tubes can meet different application needs.
S250GD Galvanized Steel Products Dimension
| Product Type | Thickness (mm / inch) | Width / Outer Diameter (mm / inch) | Length (mm / ft) |
| S250GD Sheet | 0.30 – 3.00 mm (0.012 – 0.118″) | 800 – 1830 mm (31.5 – 72″) | Up to 6,000 mm (Up to 19.69 ft) |
| S250GD Coil | 0.30 – 3.00 mm (0.012 – 0.118″) | 800 – 1830 mm (31.5 – 72″) | Custom length available |
| S250GD Pipe | 1.5 – 12.0 mm (0.059 – 0.472″) | 21.3 – 219.1 mm (0.84 – 8.63″) | Up to 12,000 mm (Up to 39.37 ft) |
S250GD Galvanized Steel Sheet
S250GD galvanized steel sheets are widely used in building structures, roofing, wall cladding, and industrial applications. With a uniform zinc coating and excellent corrosion resistance, they provide durability and aesthetic appeal. Sheets can be used directly or further processed for painting and forming.
S250GD Galvanized Steel Coil
S250GD galvanized steel coil is designed for large-scale processing and various forming applications. It can be easily cut and welded, making it suitable for automotive parts, household appliances, and building materials.
We offer two galvanizing options:
- Hot-dip galvanizing – Provides superior corrosion resistance.
- Electro-galvanizing – Offers a smoother, more refined appearance.
S250GD Galvanized Steel Pipe
S250GD galvanized steel pipe is ideal for structural support, piping systems, and ventilation equipment. It features:
- Excellent corrosion resistance and durability, ensuring long-term performance in harsh environments.
- A smooth, easy-to-clean surface, making it suitable for construction and industrial applications.
For custom sizes and specifications, feel free to contact us—we’ll recommend the best solution for your needs!
S250GD Galvanized Steel Applications
Our S250GD galvanized steel products are used in a wide range of applications due to their strength, corrosion resistance and good processability, mainly including:
- Construction: structures such as roofs, wall panels, garage doors, etc., to ensure the durability and beauty of the building.
- Automobile manufacturing: body panels, chassis and other parts, providing corrosion and impact protection.
- Household appliances: refrigerators, washing machines and other shells, rust prevention and extended service life.
- Industrial equipment: ventilation ducts, storage tanks, etc., suitable for high humidity or corrosive environments.
- Electrical equipment and hardware: junction boxes, decorative parts, etc., beautiful appearance, corrosion resistance and durability.
- Agricultural equipment: greenhouse structures, agricultural machinery, etc., strong weather resistance, suitable for outdoor applications.
S250GD Galvanized Steel Manufacturer
SteelPRO Group offers a wide range of S250GD products including plates, coils and tubes to meet a variety of application needs. Our S250GD galvanized steel has excellent corrosion resistance and processing flexibility, especially suitable for high-strength and durable applications such as building structures, roofing, and exterior wall cladding. Coils are suitable for large-scale processing, while tubes are suitable for structural support and piping systems. Tell us what you need and we will recommend the most suitable solution for you!
