S355ML STEEL – WIND AND SOLAR STRUCTURAL STEEL
S355ML STEEL – WIND AND SOLAR STRUCTURAL STEEL
S355ML steel is a high-strength, wind turbine sower structural steel with a yield strength of 355 MPa. “S” denotes structural steel, “355” is the yield strength, “M” means thermomechanically rolled, and “L” indicates low-temperature toughness. Composed of 97% iron with small amounts of carbon and manganese, it’s used in bridges, buildings, and offshore structures. It offers excellent strength and toughness, typically in solid plates or sections, and is processed through hot rolling.
Description
What is S355ML
S355ML steel is composed of 97% iron, with 0.16% carbon, 1.35% manganese, and other elements. Available as solid plates or sections in steel grey, this thermomechanically rolled structural steel offers high yield strength (355 MPa) and excellent low-temperature toughness. It is primarily used in bridges, buildings, and offshore structures and is processed through hot rolling.Characteristics of S355ML Steel
S355ML steel is characterized by high strength, excellent toughness, and superior weldability. It withstands significant wind loads and dynamic forces, resists brittle fracture, and performs well in low temperatures, making it ideal for offshore and high-altitude installations. Its fatigue resistance ensures long-term structural stability, and its durability resists environmental degradation for an extended service life. Additionally, S355ML offers superior corrosion resistance for marine environments, reducing maintenance needs. Its formability allows for complex shapes, supporting efficient tower design. The material aligns with renewable energy standards, supporting sustainable manufacturing practices, and is cost-effective, balancing performance and affordability for optimal project economics.Chemical Compositions
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.20 |
| Silicon (Si) | ≤ 0.50 |
| Manganese (Mn) | 1.10 – 1.70 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Nitrogen (N) | ≤ 0.014 |
| Chromium (Cr) | ≤ 0.30 |
| Nickel (Ni) | ≤ 0.30 |
| Molybdenum (Mo) | ≤ 0.10 |
| Copper (Cu) | ≤ 0.55 |
| Vanadium (V) | ≤ 0.12 |
| Niobium (Nb) | ≤ 0.05 |
| Titanium (Ti) | ≤ 0.05 |
Physical Properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Melting Point | 1420°C – 1460°C | 2588°F – 2660°F |
| Boiling Point | – | – |
| Thermal Conductivity | 35 W/m·K | 20.2 BTU·in/hr·ft²·°F |
| Electrical Conductivity | – | – |
| Specific Heat Capacity | 500 J/kg·K | 0.12 BTU/lb·°F |
| Thermal Expansion Coefficient | 12 x 10⁻⁶ /°C | 6.7 x 10⁻⁶ /°F |
| Electrical Resistivity | 0.6 x 10⁻⁶ Ω·m | 0.6 x 10⁻⁶ Ω·m |
Mechanical Properties
| Property | Value (Metric) | Value (Imperial) |
|---|---|---|
| Tensile Strength | 490-630 MPa | 71-91 ksi |
| Yield Strength | 355 MPa | 51 ksi |
| Brinell Hardness (HB) | 130-180 | 130-180 |
| Rockwell Hardness (HRC) | 70-75 | 70-75 |
| Vickers Hardness (HV) | 140-190 | 140-190 |
| Elongation | 20-25% | 20-25% |
| Elastic Modulus | 210 GPa | 30.5 Msi |
Industries & Applications
| Industry | Application Examples |
|---|---|
| Construction Industry | High-rise building support beams, Bridge girders and trusses, Stadium roof structures, Heavy-duty crane components |
| Marine Industry | Offshore platform support structures, Ship hull reinforcements, Dock and port infrastructure, Underwater pipeline supports |
| Energy Industry | Oil rig structural elements, Hydroelectric dam components, Nuclear power plant containment structures, Geothermal power plant support frames |
| Transportation Industry | Railway bridge components, Heavy-duty truck chassis, Container ship structural elements, Aircraft hangar frameworks |
| Mining Industry | Mine shaft support structures, Heavy equipment frames, Ore processing plant structures, Conveyor system support frames |
| Aerospace Industry | Rocket launch pad structures, Satellite ground station frameworks, Aircraft maintenance hangar beams, Space vehicle assembly facility supports |
Machining
S355ML Heat Treating Instructions: S355ML steel is typically supplied in a thermomechanically rolled condition, which enhances its strength and toughness. Additional heat treatment is generally not required, but it can be normalized or stress-relieved if needed for specific applications.
S355ML Surface Finish: The surface of S355ML steel can be treated through methods such as shot blasting, painting, or galvanizing to improve corrosion resistance and ensure long-term durability in harsh environments.
Custom grades can be produced upon request to meet specific requirements.
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