EN 10225 1.1184 + QT Introduce
The EN 10225 steel standard defines the rules and regulations regarding the usage of the S355G2+N steel grade in the fabrication of offshore structures. The standard ensures a consistent quality of product by requiring that all the raw material used be of top quality and by instituting specific quality control measures during the uncoiling, cold and hot processing, and welding processes. By implementing these rules, the EN 10225 steel standard can be relied upon to produce products that meet all of the requirements pertaining to safety and reliability.
Smelting temperature:1124°C - 1646°C
Application:Weldable structural steel with fixed offshore structure - Technical delivery conditions
EN 10225 1.1184 + QT Material Chemical Composition
The chemical composition of the EN 10225 1.1184 + QT steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | - | 0.1000 |
| Titanium (Ti) | - | 0.0200 |
| Tin (Sn) | - | 0.0200 |
| Silicon (Si) | 0.1500 | 0.5500 |
| Antimony (Sb) | - | 0.0100 |
| Sulfur (S) | - | 0.0100 |
| Lead (Pb) | - | 0.0100 |
| PhOsphorus (P) | - | 0.0250 |
| Nickel (Ni) | - | 0.3000 |
| (Nb+V+Ti) | - | 0.1200 |
| (Nb+V) | - | 0.1000 |
| Niobium (Nb) | - | 0.0500 |
| Nitrogen (N) | - | 0.0140 |
| Molybdenum (Mo) | - | 0.0800 |
| Manganese (Mn) | - | 1.6000 |
| Copper (Cu) | - | 0.3500 |
| (Cr+Ni+Cu+Mo) | - | 0.8000 |
| Chromium (Cr) | - | 0.2500 |
| Calcium (Ca) | - | 0.0050 |
| Carbon (C) | - | 0.1800 |
| Bismuth (Bi) | - | 0.0100 |
| Boron (B) | - | 0.0005 |
| Arsenic (As) | - | 0.0200 |
| Aluminum (Al) | - | 0.0600 |
EN 10225 1.1184 + QT Material Mechanical Properties
EN 10225 1.1184 + QT steel also has excellent corrosion resistance. This is due to the addition of alloying elements, such as chromium, molybdenum, and nickel. These elements form a protective oxide layer on the surface of the steel, which prevents further corrosion. This makes EN 10225 1.1184 + QT steel an ideal choice for applications where corrosion resistance is a must.
The mechanical properties of the EN 10225 1.1184 + QT steel are as follows:
| YieldRp0.2 | ≤ 724 (MPa) |
| TeileRm | ≤ 357 (MPa) |
| ImpactKV/Ku | 42(J) |
| ElongationA | 32% |
| Reduction in cross section on fractureZ | 23% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 141 |
EN 10225 1.1184 + QT Material Thermal Properties
The thermal performance parameters of the EN 10225 1.1184 + QT steel are as follows:
| Temperature (°C) | 14 | 956 | 984 |
| Modulus of elasticity (GPa) | - | 784 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 11.3 | 21.2 |
| Specific thermal capacity (J/kg·°C) | - | 221 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.24 | - | - |
| Deity (kg/dm³) | - | - | 413 |
| Poisson’s coefficient, ν | - | - | 333 |
EN 10225 1.1184 + QT Material Machining Technology
Machining is the process of shaping and cutting material, and in the case of EN 10225 1.1184 + QT steel, it involves several activities such as drilling, milling, grinding, and turning. Machining EN 10225 1.1184 + QT steel is challenging because of its hardness, but it is possible to achieve good results if the correct cutting tools, cutting conditions, and machine power settings are used.