EN 10225 S355G7 + M Introduce
The main motivation of this EN 10225 standard was to create a unified and reliable set of procedures and requirements when constructing offshore structures such as offshore platforms or oil rigs. The S355G2+N steel grade is used in applications ranging from equipment used on platform and topsides to mooring piles, anchor chains, and risers. This steel grade offers excellent corrosion resistance, high tensile and yield strength, and fatigue strength.
Smelting temperature:1897°C - 1192°C
Application:Weldable structural steel with fixed offshore structure - Technical delivery conditions
EN 10225 S355G7 + M Material Chemical Composition
The chemical composition of the EN 10225 S355G7 + M steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | - | 0.0600 |
| Titanium (Ti) | - | 0.0250 |
| Tin (Sn) | - | 0.0200 |
| Silicon (Si) | 0.1500 | 0.5500 |
| Antimony (Sb) | - | 0.0100 |
| Sulfur (S) | - | 0.0100 |
| Lead (Pb) | - | 0.0100 |
| PhOsphorus (P) | - | 0.0200 |
| Nickel (Ni) | - | 0.5000 |
| (Nb+V) | - | 0.0600 |
| (Nb+Ti+V) | - | 0.0800 |
| Niobium (Nb) | - | 0.0400 |
| Nitrogen (N) | - | 0.0100 |
| Molybdenum (Mo) | - | 0.0800 |
| Manganese (Mn) | 1.0000 | 1.6500 |
| Copper (Cu) | - | 0.3000 |
| (Cr+Ni+Cu+Mo) | - | 0.9000 |
| Chromium (Cr) | - | 0.2500 |
| (CEV) | - | 0.4300 |
| Calcium (Ca) | - | 0.0050 |
| Carbon (C) | - | 0.1400 |
| Bismuth (Bi) | - | 0.0100 |
| Boron (B) | - | 0.0005 |
| Arsenic (As) | - | 0.0300 |
| Aluminum (Al) | 0.0150 | 0.0550 |
EN 10225 S355G7 + M Material Mechanical Properties
EN 10225 S355G7 + M steel has a wide range of physical properties that make it an ideal material for many different uses. It has a relatively low density of approximately 7.68 g/cm3, which makes it an excellent option for applications where strength to weight ratio is important. The high chromium content of the alloy also gives it excellent corrosion resistance, making it a suitable material for use in corrosive environments. Another benefit of its composition is good formability, as the alloy tends to be malleable enough to cold form as well as heat treatable.
The mechanical properties of the EN 10225 S355G7 + M steel are as follows:
| YieldRp0.2 | ≤ 739 (MPa) |
| TeileRm | ≤ 573 (MPa) |
| ImpactKV/Ku | 22(J) |
| ElongationA | 42% |
| Reduction in cross section on fractureZ | 44% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 442 |
EN 10225 S355G7 + M Material Thermal Properties
The thermal performance parameters of the EN 10225 S355G7 + M steel are as follows:
| Temperature (°C) | 21 | 787 | 482 |
| Modulus of elasticity (GPa) | - | 337 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 41 |
| Thermal conductivity (W/m·°C) | - | 32.3 | 44.2 |
| Specific thermal capacity (J/kg·°C) | - | 434 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.44 | - | - |
| Deity (kg/dm³) | - | - | 113 |
| Poisson’s coefficient, ν | - | - | 243 |
EN 10225 S355G7 + M Material Machining Technology
EN 10225 S355G7 + M steel is an alloy of iron, carbon, and other elements. It has a combination of excellent properties, such as strength, toughness, fatigue resistance, and weldability, which make it an ideal material for use in a wide range of components and applications. While the steel's optimal characteristics can be achieved through cold and hot forming processes, machining is one of the key manufacturing processes used when manufacturing parts and components from EN 10225 S355G7 + M steel.