What is API 5L X70 PSL2 specification?
Phoebe Han
Steel Export Manager/Manufacturer/Supplier from BEBON STEEL([email protected]) )
The API 5L X70 PSL2 specification is part of the API 5L standard the American Petroleum Institute (API) set for producing line pipes used in transportation systems for oil, gas, and other fluids. Here's a detailed explanation:
API 5L X70 PSL2 Specification Details
Grade:
X70 refers to the steel's minimum yield strength, which is 70,300 psi (485 MPa).
Product Levels:
API 5L pipes are classified into two product specification levels: PSL1: Basic requirements.
PSL2: Higher requirements with additional chemical, mechanical, and testing properties.
PSL2 is more stringent than PSL1 and is typically used in critical pipeline projects.
Key Requirements for PSL2:
a. Chemical Composition:
Lower carbon content compared to PSL1, ensuring better weldability.
Controlled levels of sulfur (S) and phosphorus (P) to reduce impurities.
b. Mechanical Properties:
Yield Strength: Minimum 485 MPa.
Tensile Strength: Typically around 565 MPa to 758 MPa.
Charpy Impact Test: Ensures toughness at low temperatures.
c. Manufacturing Process:
PSL2 pipes require stricter control of manufacturing processes.
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Heat treatment, such as quenching and tempering, may be applied to meet specific mechanical properties.
d. Testing:
Mandatory non-destructive testing (NDT) such as ultrasonic or radiographic testing.
Hydrostatic tests to confirm pressure containment.
Toughness tests, especially in cases of low-temperature environments.
Applications:
Used for transporting oil, gas, and other fluids under high pressure.
Suitable for environments where high strength and toughness are critical.
Dimensions and Types:
Can be supplied in seamless or welded form.
Typically produced in sizes ranging from 0.405 inches (10.3 mm) to 80 inches (2,030 mm) in outer diameter.
Marking and Certification:
Pipes are marked with details like grade, PSL level, dimensions, heat number, and manufacturer’s identification.
A mill test certificate (MTC) is provided, confirming compliance with the specification.
If you need more specific details, such as the chemical composition limits or a comparison between PSL1 and PSL2, feel free to ask!
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