GB/T 9711 PSL2 Grade X70Q Introduce
GB/T 9711 PSL2 Grade X70Q applies to the pipes and pipelines for the transportation of petroleum, natural gas and coal dust in the oil and gas industry. It is also suitable for other fluid, gas and solid transportation that meet the requirements of the related definitions. The pipes and pipelines are usually made from the carbon structural steel and alloy structural steel, which must conform to the specified mechanical properties uniaxial or biaxial tensile test.
Smelting temperature:1611°C - 1242°C
Application:Oil and gas industry, steel pipe for pipeline transportation system
GB/T 9711 PSL2 Grade X70Q Material Chemical Composition
The chemical composition of the GB/T 9711 PSL2 Grade X70Q steel are as follows:
| Element | Min | Max |
|---|---|---|
| Sulfur (S) | - | 0.0150 |
| PhOsphorus (P) | - | 0.0250 |
| Manganese (Mn) | - | 1.8000 |
| Silicon (Si) | - | 0.4500 |
| Carbon (C) | - | 0.1800 |
GB/T 9711 PSL2 Grade X70Q Material Mechanical Properties
The yield strength of GB/T 9711 PSL2 Grade X70Q 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 X70Q steel are as follows:
| YieldRp0.2 | ≤ 267 (MPa) |
| TeileRm | ≤ 288 (MPa) |
| ImpactKV/Ku | 43(J) |
| ElongationA | 22% |
| Reduction in cross section on fractureZ | 22% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 133 |
GB/T 9711 PSL2 Grade X70Q Material Thermal Properties
The thermal performance parameters of the GB/T 9711 PSL2 Grade X70Q steel are as follows:
| Temperature (°C) | 12 | 656 | 189 |
| Modulus of elasticity (GPa) | - | 812 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 11 |
| Thermal conductivity (W/m·°C) | - | 23.3 | 13.2 |
| Specific thermal capacity (J/kg·°C) | - | 342 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.43 | - | - |
| Deity (kg/dm³) | - | - | 333 |
| Poisson’s coefficient, ν | - | - | 322 |
GB/T 9711 PSL2 Grade X70Q Material Machining Technology
GB/T 9711 PSL2 Grade X70Q Steel is one of the most important materials used in construction and engineering. Steel products have a wide range of uses ranging from consumer goods to aerospace components. Different types of steels are produced to meet different needs and requirements depending on the application. GB/T 9711 PSL2 Grade X70Q steel is a Chinese industry standard steel grade used for pipeline transportation systems in the petroleum and natural gas industries. GB/T 9711 PSL2 Grade X70Q steel is widely used in the manufacture of oil and gas pipelines due to its excellent mechanical properties and corrosion resistance. This article will focus on the mechanical properties of GB/T 9711 PSL2 Grade X70Q steel including its yield and tensile strength, mechanical properties at elevated temperatures, wear resistance and fatigue performance.