EN 10225 S420G6 + QT Introduce
The EN 10225 standard is incredibly important for industries such as the offshore expeditions and machinery production. This is the standard that must be used for materials that adhere to structural criteria for the offshore industry and since offshore components are very expensive, it is important that the materials used in their construction adhere to this standard. The EN 10225 standard is an important standard that is necessary to ensure that these materials meet certain requirements, such as weldability and fatigue, which makes them more durable and reliable. As offshore components are often used in extreme conditions, such as salt water, the EN 10225 standard is necessary to ensure that they will be able to stand up to these conditions.
Smelting temperature:1743°C - 1717°C
Application:Weldable structural steel with fixed offshore structure - Technical delivery conditions
EN 10225 S420G6 + QT Material Chemical Composition
The chemical composition of the EN 10225 S420G6 + QT steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | - | 0.1000 |
| Titanium (Ti) | - | 0.0400 |
| Tin (Sn) | - | 0.0200 |
| Silicon (Si) | 0.1500 | 0.5500 |
| Antimony (Sb) | - | 0.0100 |
| Sulfur (S) | - | 0.0070 |
| Lead (Pb) | - | 0.0100 |
| PhOsphorus (P) | - | 0.0250 |
| Nickel (Ni) | - | 0.6500 |
| (Nb+V) | - | 0.1000 |
| (Nb+Ti+V) | - | 0.1200 |
| Niobium (Nb) | - | 0.0500 |
| Nitrogen (N) | - | 0.0140 |
| Molybdenum (Mo) | - | 0.2500 |
| Manganese (Mn) | 1.0000 | 1.6500 |
| Copper (Cu) | - | 0.3000 |
| (Cr+Ni+Cu+Mo) | - | 0.8000 |
| Chromium (Cr) | - | 0.3000 |
| Calcium (Ca) | - | 0.0050 |
| Carbon (C) | - | 0.1600 |
| Bismuth (Bi) | - | 0.0100 |
| Boron (B) | - | 0.0005 |
| Arsenic (As) | - | 0.0200 |
| Aluminum (Al) | - | 0.0600 |
EN 10225 S420G6 + QT Material Mechanical Properties
EN 10225 S420G6 + QT 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 S420G6 + QT steel are as follows:
| YieldRp0.2 | ≤ 876 (MPa) |
| TeileRm | ≤ 675 (MPa) |
| ImpactKV/Ku | 14(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 22% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 312 |
EN 10225 S420G6 + QT Material Thermal Properties
The thermal performance parameters of the EN 10225 S420G6 + QT steel are as follows:
| Temperature (°C) | 42 | 537 | 826 |
| Modulus of elasticity (GPa) | - | 924 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 11.3 | 13.2 |
| Specific thermal capacity (J/kg·°C) | - | 424 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.21 | - | - |
| Deity (kg/dm³) | - | - | 121 |
| Poisson’s coefficient, ν | - | - | 434 |
EN 10225 S420G6 + QT Material Machining Technology
One of the benefits of EN 10225 S420G6 + QT steel is its good corrosion resistance, but for some applications this may not be enough. In these cases, surface treatments can be used to further improve the alloy's corrosion resistance. These treatments can include different coating methods, such as galvanizing or painting, as well as stainless-steel finishing. These treatments can help to further protect the steel from corrosion and improve its durability in corrosive environments.