ISO 3183 PSL2 Grade L390N Introduce
The ISO 3183 PSL2 Grade L390N series of international standards are applicable to steels related to the construction of pipelines and line pipes.This series includes six categories of steel grades based on the anticipated application and location of use. These arePurchaser standards refer to self-determined by the user to obtain the desired steel grade.
1. Carbon Steel Grades – L245, L290, L320, L360, L390, L415, L450
2. Low alloy steel grades – L245NB, L290NB, L360NB, L415NB, L450QS
3. High alloy steel grades – L485, L555, L625, L690
4. High yield strength steel grades – L245N, L290N, L360N, L415N, L450Q
5. High corrosion resistance steel grades – L245NE, L290NE, L360NE, L415NE, L450QE
6. Extra high strength steel grades – L485N, L555M, L625N, L690NB
Smelting temperature:1141°C - 1532°C
Application:Petroleum and natural gas industries -- Steel pipe for pipeline transportation systems
ISO 3183 PSL2 Grade L390N Material Mechanical Properties
The mechanical properties of ISO 3183 PSL2 Grade L390N are determined through the combination of chemistry, heat treatment, and mechanical processing. Generally speaking, the mechanical properties of ISO 3183 PSL2 Grade L390N can be improved by increasing the levels of alloying elements, such as carbon and manganese. ISO 3183 PSL2 Grade L390N is often classified as a medium carbon steel with a yield strength of at least 250 MPa (36 ksi). It is also classified as an alloy steel, which means it has a higher level of strength than low carbon steel and greater wear resistance than stainless steel. Generally, ISO 3183 PSL2 Grade L390N has excellent weldability and is suitable for cold forming and bending.
The mechanical properties of the ISO 3183 PSL2 Grade L390N steel are as follows:
| YieldRp0.2 | ≤ 654 (MPa) |
| TeileRm | ≤ 623 (MPa) |
| ImpactKV/Ku | 32(J) |
| ElongationA | 13% |
| Reduction in cross section on fractureZ | 41% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 234 |
ISO 3183 PSL2 Grade L390N Material Thermal Properties
The thermal performance parameters of the ISO 3183 PSL2 Grade L390N steel are as follows:
| Temperature (°C) | 44 | 182 | 941 |
| Modulus of elasticity (GPa) | - | 422 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 13 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 24.2 |
| Specific thermal capacity (J/kg·°C) | - | 141 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.13 | - | - |
| Deity (kg/dm³) | - | - | 424 |
| Poisson’s coefficient, ν | - | - | 411 |
ISO 3183 PSL2 Grade L390N Material Machining Technology
The machining parameters of ISO 3183 PSL2 Grade L390N may vary depending on the specific application. In general, care must be taken to ensure that the cutting speed, feed rate, and depth of cut are suitable for the material. The operator should also be aware of the proper cutting direction to avoid tool breakage and other machining problems.