GB/T 9711 PSL2 Grade BQ 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 BQ before they can be put into use.
Smelting temperature:1926°C - 1969°C
Application:Oil and gas industry, steel pipe for pipeline transportation system
GB/T 9711 PSL2 Grade BQ Material Chemical Composition
The chemical composition of the GB/T 9711 PSL2 Grade BQ 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 BQ Material Mechanical Properties
GB/T 9711 PSL2 Grade BQ steel also has excellent ductility, which makes it an ideal choice for applications that require bending and forming. The steel has an elongation rate of between 20 and 30%, which ensures excellent formability without sacrificing strength.
The mechanical properties of the GB/T 9711 PSL2 Grade BQ steel are as follows:
| YieldRp0.2 | ≤ 713 (MPa) |
| TeileRm | ≤ 452 (MPa) |
| ImpactKV/Ku | 23(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 13% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 233 |
GB/T 9711 PSL2 Grade BQ Material Thermal Properties
The thermal performance parameters of the GB/T 9711 PSL2 Grade BQ steel are as follows:
| Temperature (°C) | 23 | 579 | 442 |
| Modulus of elasticity (GPa) | - | 113 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 31 |
| Thermal conductivity (W/m·°C) | - | 21.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 421 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.14 | - | - |
| Deity (kg/dm³) | - | - | 311 |
| Poisson’s coefficient, ν | - | - | 224 |
GB/T 9711 PSL2 Grade BQ Material Machining Technology
The main machining processes for GB/T 9711 PSL2 Grade BQ steel include turning, milling, drilling and grinding. Each of these processes can be used to produce components of various sizes and complexity, depending on the application.
Turning is a process in which a rotating tool removes, or cuts, material from the surface of the workpiece. This process is typically used to produce components with round, curved and intricate shapes.
Milling is a process that uses a rotary cutting tool, such as an end mill, to remove material from the workpiece. This process can produce components with flat, angled and complex surfaces.
Drilling is a process in which a drill bit is used to make a number of small holes in the surface of the workpiece. This process is commonly used to produce components with a large number of holes or in components that require a large number of tapped holes.
Grinding is a process in which an abrasive material is used to remove material from the surface of the workpiece using a rotating grinding wheel. This process can produce precision features, such as a flat surface, as well as intricate shapes or patterns.