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S550GD | 1.0531 Steel : Properties, Process, Uses
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S550GD is a high-strength, corrosion-resistant galvanized steel, ideal for construction, automotive, and industrial applications. We’ll walk through its composition, properties, production, machining, and surface treatments, helping you determine how S550GD can enhance your project’s durability and performance.
Want to see how S550GD can enhance your next project? Contact us today for expert advice or a customized quote!
What is S550GD Steel?
S550GD is a structural steel with a 550 MPa yield strength, compliant with EN 10346. It’s 98-99% iron, 0.1-0.2% carbon, available as galvanized flat-rolled steel. “S” denotes structural, “550” yield strength, and “GD” galvanization. Coatings such as +Z and +ZF offer protection. Suitable for building, automotive, and industrial machinery. Comparable to FeE550G, EU number 1.0531.
S550GD Steel Chemical Composition
In order to ensure the excellent performance of S550GD steel, we have made a precise ratio of its chemical composition. Next, we will show its key components in detail.
| Element | Content (%) |
| Iron, Fe | 98-99 |
| Carbon, C | 0.1-0.2 |
| Manganese, Mn | ≤ 1.5 |
| Phosphorus, P | ≤ 0.1 |
| Sulfur, S | ≤ 0.045 |
| Silicon, Si | ≤ 0.6 |
| Nitrogen, N | ≤ 0.012 |
| Aluminum, Al | ≤ 0.015 |
S550GD Steel Mechanical Properties
In addition to its excellent chemical composition, our S550GD galvanized steel also has outstanding mechanical properties:
| Property | Metric | Imperial |
| Tensile Strength | 550-620 MPa | 79.8-89.9 ksi |
| Yield Strength | ≥ 550 MPa | ≥ 79.8 ksi |
| Brinell Hardness | 150-190 HB | 150-190 HB |
| Rockwell Hardness | 80-90 HRB | 80-90 HRB |
| Vickers Hardness | 160-200 HV | 160-200 HV |
| Elongation | 15-20% | 15-20% |
| Elastic Modulus | 210 GPa | 30,500 ksi |
| Fracture Elongation (≤ 0.7mm) | ≥ 12% | ≥ 12% |
| Fracture Elongation (> 0.7mm) | ≥ 14% | ≥ 14% |
| Coating Adhesion (Bend Radius) | 0T-2T (0-2x thickness) | 0T-2T (0-2x thickness) |
S550GD Steel Production Processes
At SteelPRO Group, we strictly control every production link to ensure that each batch of S550GD galvanized steel has excellent performance and high quality to meet your various needs.
- Smelting: First, we melt iron and carbon at high temperatures and add specific alloying elements to ensure the basic strength and performance of the steel.
- Continuous Casting: The molten steel is cast into thick plates to prepare for subsequent processing to ensure the uniformity and structural stability of the steel.
- Hot Rolling: The steel plates are heated to 1100°C and hot rolled, using higher rolling pressures to ensure the strength of the steel, meeting the high strength requirements of S550GD.
- Cold Rolling: During the cold rolling process, we process with precise dimensions and smooth surfaces, using higher pressures to ensure the strength and quality of the steel.
- Annealing: The steel is heated to 700-900°C for annealing, relieving internal stresses while maintaining its high strength and toughness.
- Galvanizing: Finally, the steel is hot-dip galvanized, coating it with a layer of zinc for enhanced corrosion resistance. Depending on the application requirements, we offer different coating options such as zinc-iron coating (+ZF) and aluminum-zinc coating (+AZ) to provide long-term protection for steel.
S550GD Steel Machining
At SteelPRO Group, we offer a variety of advanced processing methods to ensure that S550GD steel can be precisely processed according to our customers’ needs. No matter what processing method your project requires, our technical team can provide you with professional support to ensure product quality and efficiency.
Cutting
S550GD steel is suitable for technologies such as laser cutting, plasma cutting and shearing. These cutting methods can process the steel quickly and efficiently, but due to its high hardness, we recommend using sharper tools and appropriately reducing processing speeds to ensure cutting results and tool life.
Related Reading: How to Cut Galvanized Steel?
Cold Bending
S550GD steel performs well in cold bending and is well suited for forming structural components. However, for tighter bending requirements, we recommend the use of specialized tools to better control the strength of the steel and ensure processing accuracy and product quality.
Stamping
Due to the high durability of S550GD steel, it is well suited for heavy-duty stamping processes and is widely used in the manufacturing industry. However, the durability of the stamping tool is also crucial, and we provide our customers with high-quality stamping tools to ensure long-term stable processing results.
Forming
S550GD is also suitable for processing complex shapes and can meet various design requirements. To avoid cracks, we recommend that you take extra care during processing to ensure that the steel is not overstressed during the forming process.
Welding
S550GD steel supports a variety of welding methods, including standard techniques such as MIG, TIG and spot welding. Although the fusion zone and heat-affected zone during welding require special attention, we provide additional protection to ensure that the corrosion resistance of the steel is not affected after welding, thereby extending the service life.
More Details for: Can You Weld Galvanized Steel?
What Are The Temperature Limits For S550GD Steel?
SteelPRO Group’s S550GD steel can withstand temperatures up to 400°C. With aluminum-zinc or aluminum-silicon coatings, our S550GD is more stable in high temperature environments and is suitable for applications with high temperature requirements such as construction, automotive and industrial equipment. Choosing our products, you can rest assured that they will be used in harsh conditions.
S550GD Steel Sheet and Plate Specifications
SteelPro Group provides high-quality S550GD steel sheets and plates with various custom options. We offer custom cutting, slitting, and surface treatments to meet specific project requirements.
| Product Form | Thickness (mm / inch) | Width (mm / inch) | Length (mm / inch) |
| S550GD Steel Sheet | 0.3 – 3.0 mm (0.012 – 0.12″) | 600 – 1850 mm (23.6 – 72.8″) | 1000 – 6000 mm (39.4 – 236″) |
| S550GD Steel Plate | 3.0 – 12.0 mm (0.12 – 0.47″) | 600 – 2000 mm (23.6 – 78.7″) | 1000 – 12000 mm (39.4 – 472″) |
S550GD Steel Surface Treatment
At SteelPRO Group, we use advanced surface treatment technology to ensure that S550GD steel has excellent performance in various application scenarios and prolongs the service life of the product.
Quality Grades: Available in FB, FC, FD, NA, MA, and MC to meet specific appearance and functional needs.
Coating Types:
- +Z: Zinc coating for basic corrosion resistance.
- +ZF: Zinc-iron for enhanced durability.
- +ZA: Zinc-aluminum for added wear resistance.
- +ZM: Zinc-magnesium for robust chemical and weather protection.
- +AZ: Aluminum-zinc for heat and corrosion resistance, ideal for high-temperature uses.
- +AS: Aluminum-silicon, specifically for applications involving high heat.
- Color Coating: We offer a variety of color coating options that not only improve corrosion protection but also meet the appearance requirements of industries such as construction and home appliances, helping customers find the perfect balance between beauty and functionality.
Additional Options: We provide additional protection processes such as chemical passivation, chromate treatment and oil film coating to ensure that S550GD steel is fully protected during transportation, storage and use.
Foils: Available in types like zinc, aluminum-zinc, magnesium-zinc, and aluminum-silicon, commonly used for insulation, structural layering, and protective wrapping.
Maximum Coating Thickness: Defined by the base material, enabling customized performance for various uses.
Can S550GD Be Used With Color Coating For Aesthetic Applications?
Yes, SteelPRO Group’s S550GD steel can be color coated to improve corrosion resistance and enhance aesthetics for applications requiring visual appeal such as architectural panels and appliance housings.
Is S550GD Compatible With Powder Coating?
Yes, S550GD is compatible with powder coating, which provides an additional layer of corrosion protection and aesthetic finish, making it ideal for exposed or decorative applications.
More Details for: Can You Powder Coat Galvanized Steel?
S550GD Steel Characteristics
SteelPRO Group’s S550GD steel has significant advantages in corrosion resistance, strength and processing performance. Compared with other brands of galvanized steel, we use exquisite production technology and quality control to ensure that each roll of S550GD can provide higher reliability and durability to meet the diverse needs of customers.
Excellent Corrosion Resistance
We provide S550GD with a variety of high-quality coatings (such as +Z, +ZF and +ZA) to ensure that it still has excellent corrosion resistance in harsh environments, reduce maintenance costs and extend service life. Compared with other brands, our coatings are more uniform and durable, and can better cope with extreme environments.
High Strength Performance
S550GD has a yield strength of 550 MPa, which is much higher than similar products (such as S500GD). This enables our S550GD to better cope with high-load applications such as construction and heavy machinery, providing greater structural stability and safety.
Excellent Processing Performance
S550GD has excellent processing performance in cold forming, cutting and stamping, and is suitable for various precision processing needs. Compared with other brands, our S550GD has stronger stability during processing, reduces cracks and deformation problems during processing, and ensures processing results.
Higher Cost-effectiveness
SteelPRO Group ensures that S550GD can provide customers with more competitive prices while ensuring high strength and performance through efficient production processes and strict quality control, helping customers to reduce costs while meeting project needs.
Optimized Springback Effect
Due to the high strength characteristics of S550GD, we have specially optimized the springback effect that may occur during roll forming. By precisely adjusting production parameters, we ensure that S550GD maintains high precision during forming, avoiding shape errors that may occur in other brands of products.
Suitable for a Variety of Applications
Although S550GD is suitable for light deep drawing, its high yield strength also performs well in other applications. We ensure its excellent performance in light and medium forming needs through precise process control.
How Does S550GD Compare To Alloyed Steels In Cost?
S550GD is typically more affordable than alloyed steels with similar strength levels, offering a cost-effective option for applications requiring high yield strength without the need for alloying elements.
Can S550GD Be Used For Deep Drawing?
While S550GD is suitable for light drawing, its high yield strength may limit its formability for deep drawing. Other grades with lower strength, like S250GD, might be more suitable for deep drawing needs.
S550GD Steel Application
- Construction: Structural beams, wall panels, and framing components.
- Automotive: Chassis parts, reinforcement beams, and impact-resistant components.
- Appliances: Washing machine drums, refrigerator liners, and oven housings.
- Roofing and Cladding: Roof panels, exterior wall cladding, and soffits.
- HVAC Systems: Ductwork, air conditioning enclosures, and ventilation panels.
- Agricultural Equipment: Tractor frames, plow blades, and storage tanks.
- Storage Containers: Fuel tanks, chemical storage units, and water tanks.
- Electrical Enclosures: Switchgear cabinets, control panels, and transformer cases.
Reliable S550GD Steel Manufacturer
At SteelPRO Group, our inventory includes high-quality S550GD products in a variety of formats, ensuring you have the material you need when you need it:
- S550GD Galvanized Steel Sheet
- S550GD Galvanized Steel Coil
- S550GD Galvanized Steel Pipe
- S550GD Galvanized Steel Roof Sheet
Contact us today to discuss your specific requirements or request a quote and let us help you find the right solution for your project.
