API SPEC 5L Grade A - PSL1 Introduce
API SPEC 5L Grade A - PSL1 is a steel pipe specification for pipeline transportation, published by the American Petroleum Institute (API). API SPEC 5L specifies a range of requirements, including chemical composition, mechanical properties, dimensions, and physical characteristics of steel pipes. These requirements are designed to ensure that the steel pipes have sufficient strength, toughness, and corrosion resistance to meet the demands of various environments.
Smelting temperature:1538°C - 1423°C
Application:Line pipe
API SPEC 5L Grade A - PSL1 Material Chemical Composition
The chemical composition of the API SPEC 5L Grade A - PSL1 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | - | 0.2200 |
| Manganese (Mn) | - | 0.9000 |
| PhOsphorus (P) | - | 0.0300 |
| Sulfur (S) | - | 0.0300 |
| Nickel (Ni) | - | 0.5000 |
| Chromium (Cr) | - | 0.5000 |
| Molybdenum (Mo) | - | 0.1500 |
| Copper (Cu) | - | 0.5000 |
| Boron (B) | - | 0.0010 |
API SPEC 5L Grade A - PSL1 Material Mechanical Properties
Yield strength refers to the minimum amount of stress a material can withstand before it starts to deform plastically. For API SPEC 5L Grade A - PSL1, the minimum yield strength for steel pipes is specified as a function of the pipe grade and size. For example, for Grade X52 pipes with a diameter of less than 2.375 inches, the minimum yield strength is 52,000 psi (or 360 MPa).
The mechanical properties of the API SPEC 5L Grade A - PSL1 steel are as follows:
| YieldRp0.2 | ≤ 272 (MPa) |
| TeileRm | ≤ 892 (MPa) |
| ImpactKV/Ku | 24(J) |
| ElongationA | 12% |
| Reduction in cross section on fractureZ | 41% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 111 |
API SPEC 5L Grade A - PSL1 Material Thermal Properties
The thermal performance parameters of the API SPEC 5L Grade A - PSL1 steel are as follows:
| Temperature (°C) | 42 | 252 | 522 |
| Modulus of elasticity (GPa) | - | 897 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 22 |
| Thermal conductivity (W/m·°C) | - | 31.3 | 34.2 |
| Specific thermal capacity (J/kg·°C) | - | 424 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.41 | - | - |
| Deity (kg/dm³) | - | - | 344 |
| Poisson’s coefficient, ν | - | - | 231 |