API SPEC 5L L390 - PSL1 Introduce
API SPEC 5L L390 - 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:1919°C - 1657°C
Application:Line pipe
API SPEC 5L L390 - PSL1 Material Chemical Composition
The chemical composition of the API SPEC 5L L390 - PSL1 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | - | 0.2600 |
| Carbon (C) | - | 0.2800 |
| Manganese (Mn) | - | 1.4000 |
| 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 |
| (Nb+Ti+V) | - | 0.1500 |
API SPEC 5L L390 - PSL1 Material Mechanical Properties
API SPEC 5L L390 - PSL1 requires that steel pipes meet certain Charpy V-notch (CVN) impact test requirements. The CVN test involves striking a notched sample with a pendulum and measuring the amount of energy absorbed by the sample before it fractures. The minimum CVN energy absorption is specified as a function of pipe grade and testing temperature.
The mechanical properties of the API SPEC 5L L390 - PSL1 steel are as follows:
| YieldRp0.2 | ≤ 235 (MPa) |
| TeileRm | ≤ 487 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 14% |
| Reduction in cross section on fractureZ | 31% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 412 |
API SPEC 5L L390 - PSL1 Material Thermal Properties
The thermal performance parameters of the API SPEC 5L L390 - PSL1 steel are as follows:
| Temperature (°C) | 21 | 587 | 269 |
| Modulus of elasticity (GPa) | - | 644 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 13 |
| Thermal conductivity (W/m·°C) | - | 14.3 | 21.2 |
| Specific thermal capacity (J/kg·°C) | - | 333 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.13 | - | - |
| Deity (kg/dm³) | - | - | 233 |
| Poisson’s coefficient, ν | - | - | 421 |