GB/T 9711 PSL2 Grade L245Q Introduce
The GB/T 9711 steel standard is a national standard of the People's Republic of China for petroleum and natural gas industries. It was established in April 1996 and revised in 2011, replacing GB/T 3676-1986 and in part the SY/T 6 194-1996 standards. This standard is applicable to the steel pipes items for the both welded and seamless line pipes with the pipes diameters that range from the nominal diameter of 21.3mm to 606.4 mm. The pipe dimensional tolerance conformity and the standardized surface roughness values were also updated in the latest revision.
Smelting temperature:1588°C - 1462°C
Application:Oil and gas industry, steel pipe for pipeline transportation system
GB/T 9711 PSL2 Grade L245Q Material Chemical Composition
The chemical composition of the GB/T 9711 PSL2 Grade L245Q 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 L245Q Material Mechanical Properties
The yield strength of GB/T 9711 PSL2 Grade L245Q steel is also important as it defines the limit of the material's elasticity before it permanently deforms. The yield strength of the steel ranges anywhere from 320-480 MPa, with some grades having a yield strength of up to 550 MPa.
The mechanical properties of the GB/T 9711 PSL2 Grade L245Q steel are as follows:
| YieldRp0.2 | ≤ 713 (MPa) |
| TeileRm | ≤ 219 (MPa) |
| ImpactKV/Ku | 11(J) |
| ElongationA | 41% |
| Reduction in cross section on fractureZ | 34% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 122 |
GB/T 9711 PSL2 Grade L245Q Material Thermal Properties
The thermal performance parameters of the GB/T 9711 PSL2 Grade L245Q steel are as follows:
| Temperature (°C) | 32 | 676 | 456 |
| Modulus of elasticity (GPa) | - | 146 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 41 |
| Thermal conductivity (W/m·°C) | - | 33.3 | 42.2 |
| Specific thermal capacity (J/kg·°C) | - | 434 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.32 | - | - |
| Deity (kg/dm³) | - | - | 442 |
| Poisson’s coefficient, ν | - | - | 343 |
GB/T 9711 PSL2 Grade L245Q Material Machining Technology
The advantages of machining GB/T 9711 PSL2 Grade L245Q steel include improved product accuracy and precision, increased production efficiency, and reduced costs. In addition, the surface finish of the machined component can be enhanced, which can help to increase its longevity. On the other hand, the machining of GB/T 9711 PSL2 Grade L245Q steel can also lead to an increase in tool wear, an increase in residual stress, and even deformation of the part.