GB/T 9711 PSL2 Grade L320Q Introduce
GB/T 9711 is the standard of petroleum and natural gas industries, which specifies the steel pipe properties and materials, transportation technical conditions and test methods. Steel pipes must meet the requirements of GB/T 9711 PSL2 Grade L320Q before they can be put into use.
Smelting temperature:1923°C - 1392°C
Application:Oil and gas industry, steel pipe for pipeline transportation system
GB/T 9711 PSL2 Grade L320Q Material Chemical Composition
The chemical composition of the GB/T 9711 PSL2 Grade L320Q steel are as follows:
| Element | Min | Max |
|---|---|---|
| Titanium (Ti) | - | 0.0400 |
| Niobium (Nb) | - | 0.0500 |
| Vanadium (V) | - | 0.0500 |
| Sulfur (S) | - | 0.0150 |
| PhOsphorus (P) | - | 0.0250 |
| Manganese (Mn) | - | 1.4000 |
| Silicon (Si) | - | 0.4500 |
| Carbon (C) | - | 0.1800 |
GB/T 9711 PSL2 Grade L320Q Material Mechanical Properties
The mechanical properties of GB/T 9711 PSL2 Grade L320Q steel are also impacted by its chemical composition. The strength of this steel is typically in the range of 410-490 MPa, with the higher end of this range reaching up to 550 MPa. This strength makes it a popular choice for applications that require high durability and strength.Another important property is its tensile strength, which is the maximum force that can be applied to the material before it fails. GB/T 9711 PSL2 Grade L320Q steel typically has a tensile strength of between 620-790 MPa, but it can reach up to 1000 MPa in some grades.
The mechanical properties of the GB/T 9711 PSL2 Grade L320Q steel are as follows:
| YieldRp0.2 | ≤ 684 (MPa) |
| TeileRm | ≤ 173 (MPa) |
| ImpactKV/Ku | 23(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 12% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 411 |
GB/T 9711 PSL2 Grade L320Q Material Thermal Properties
The thermal performance parameters of the GB/T 9711 PSL2 Grade L320Q steel are as follows:
| Temperature (°C) | 33 | 939 | 263 |
| Modulus of elasticity (GPa) | - | 845 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 24 |
| Thermal conductivity (W/m·°C) | - | 33.3 | 13.2 |
| Specific thermal capacity (J/kg·°C) | - | 214 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.24 | - | - |
| Deity (kg/dm³) | - | - | 323 |
| Poisson’s coefficient, ν | - | - | 244 |
GB/T 9711 PSL2 Grade L320Q Material Machining Technology
GB/T 9711 PSL2 Grade L320Q steel is also highly weldable, which is important for applications that require joining of different pieces of steel. This steel has high levels of carbon and low levels of sulfur, which allows for strong welds that can withstand high temperatures.