ISO 3183 PSL2 Grade X70QE Introduce
The ISO 3183 PSL2 Grade X70QE 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:1611°C - 1591°C
Application:Petroleum and natural gas industries -- Steel pipe for pipeline transportation systems
ISO 3183 PSL2 Grade X70QE Material Chemical Composition
The chemical composition of the ISO 3183 PSL2 Grade X70QE steel are as follows:
| Element | Min | Max |
|---|---|---|
| (CE Pcm) | - | 0.2500 |
| Carbon (C) | - | 0.1800 |
| Manganese (Mn) | - | 1.8000 |
| PhOsphorus (P) | - | 0.0250 |
| Sulfur (S) | - | 0.0150 |
| Silicon (Si) | - | 0.4500 |
| Nickel (Ni) | - | 0.3000 |
| Chromium (Cr) | - | 0.3000 |
| Molybdenum (Mo) | - | 0.1000 |
| Copper (Cu) | - | 0.2500 |
| Vanadium (V) | - | 0.1100 |
| Titanium (Ti) | - | 0.0700 |
| Nitrogen (N) | - | 0.0120 |
| Aluminum (Al) | 0.0150 | 0.0600 |
| Niobium (Nb) | - | 0.0600 |
| (V+Nb+Ti) | - | 0.1500 |
| (CEV) | - | 0.4300 |
ISO 3183 PSL2 Grade X70QE Material Mechanical Properties
ISO 3183 PSL2 Grade X70QE has excellent corrosion resistance, making it well-suited for use in many industrial applications. The corrosion resistance of the steel can be improved by low levels of sulfur and phosphorous, as well as by adding chromium and nickel to the alloying elements. The steel's ability to resist corrosion is also dependent on the surrounding environment. In a marine environment, for example, the alloy should be treated with additional corrosion inhibitors to improve its resistance to corrosion.
The mechanical properties of the ISO 3183 PSL2 Grade X70QE steel are as follows:
| YieldRp0.2 | ≤ 365 (MPa) |
| TeileRm | ≤ 982 (MPa) |
| ImpactKV/Ku | 12(J) |
| ElongationA | 24% |
| Reduction in cross section on fractureZ | 23% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 333 |
ISO 3183 PSL2 Grade X70QE Material Thermal Properties
The thermal performance parameters of the ISO 3183 PSL2 Grade X70QE steel are as follows:
| Temperature (°C) | 24 | 397 | 344 |
| Modulus of elasticity (GPa) | - | 371 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 42 |
| Thermal conductivity (W/m·°C) | - | 44.3 | 11.2 |
| Specific thermal capacity (J/kg·°C) | - | 133 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.13 | - | - |
| Deity (kg/dm³) | - | - | 112 |
| Poisson’s coefficient, ν | - | - | 142 |
ISO 3183 PSL2 Grade X70QE Material Machining Technology
ISO 3183 PSL2 Grade X70QE is a high-strength alloy of chromium, manganese, molybdenum and other trace elements. It possesses a tensile strength up to 1630 MPa and an impact toughness of 0.22 J/cm2. Its hardness levels exceeding the Brinell Rockwell scales, making it a durable and wear-resistant metal suitable for many applications. Its strength, toughness and malleability are indicators of its ability to withstand high-temperature and pressure environments.