EN 10225 S355G4 + M Introduce
EN 10225 S355G4 + M steels were developed primarily for use in the offshore oil and gas industry and is used extensively within the industry due to their excellent fabrication properties. The steels are well-suited to fabrication and welding and have good cold workability characteristics enabling section sizes to be reduced and weight savings to be achieved. Opportunities for cost reduction can also be achieved by eliminating mechanical properties welding, for example the non-standard welding preparations and greater welding speed due to lower heat inputs.
Smelting temperature:1866°C - 1111°C
Application:Weldable structural steel with fixed offshore structure - Technical delivery conditions
EN 10225 S355G4 + M Material Chemical Composition
The chemical composition of the EN 10225 S355G4 + M steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | - | 0.1000 |
| Titanium (Ti) | - | 0.0500 |
| Silicon (Si) | - | 0.5000 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0350 |
| Nickel (Ni) | - | 0.3000 |
| Niobium (Nb) | - | 0.0500 |
| Nitrogen (N) | - | 0.0150 |
| Molybdenum (Mo) | - | 0.2000 |
| Manganese (Mn) | - | 1.6000 |
| Copper (Cu) | - | 0.3500 |
| Carbon (C) | - | 0.1600 |
| Aluminum (Al) | 0.0200 | - |
EN 10225 S355G4 + M Material Mechanical Properties
Fatigue strength is an important mechanical property of EN 10225 S355G4 + M steel. This steel has a fatigue strength of 360 MPa, which is very high for a steel of this class. This means that it is highly resistant to fatigue-induced failure even when under constant cyclic stresses. This makes EN 10225 S355G4 + M steel an ideal choice for components and structures subject to regular or prolonged cyclic stresses.
The mechanical properties of the EN 10225 S355G4 + M steel are as follows:
| YieldRp0.2 | ≤ 127 (MPa) |
| TeileRm | ≤ 716 (MPa) |
| ImpactKV/Ku | 13(J) |
| ElongationA | 32% |
| Reduction in cross section on fractureZ | 12% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 433 |
EN 10225 S355G4 + M Material Thermal Properties
The thermal performance parameters of the EN 10225 S355G4 + M steel are as follows:
| Temperature (°C) | 41 | 862 | 338 |
| Modulus of elasticity (GPa) | - | 727 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 23 |
| Thermal conductivity (W/m·°C) | - | 14.3 | 24.2 |
| Specific thermal capacity (J/kg·°C) | - | 141 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.41 | - | - |
| Deity (kg/dm³) | - | - | 221 |
| Poisson’s coefficient, ν | - | - | 333 |
EN 10225 S355G4 + M Material Machining Technology
The main advantages of using EN 10225 S355G4 + Ms are as follows:
• Excellent weldability
• Enhanced fatigue performance
• Improved sectional properties which allows analysis of smaller components with less material
• Reduction in fabrication and welding costs
• Enhanced corrosion resistance compared with traditional carbon-manganese steels
• High strength, good toughness and impact resistance
• Good cold workability
• Improved fracture toughness