API 5L Classifies Pipeline Pipes into Two Levels: PSL1 and PSL2
PSL1 (Product Specification Level 1) primarily focuses on basic mechanical properties and chemical composition requirements, without the stringent testing and additional conditions imposed on PSL2. PSL1 pipeline pipes are typically used in low-pressure or medium-pressure environments, such as onshore oil and gas transmission pipelines, where cost-effectiveness and practicality are prioritized.
Chemical Composition
PSL1 pipeline pipes have relatively simple carbon content and alloying elements. They are usually made of carbon steel with small amounts of manganese and silicon to ensure basic strength and weldability. In contrast, PSL2 pipeline pipes or higher-grade pipes (such as those used for high-pressure or low-temperature applications) may contain more alloying elements, such as chromium, nickel, or molybdenum, to enhance corrosion resistance and toughness. This difference makes PSL1 pipes more cost-effective due to simpler raw materials and manufacturing processes. For example, PSL1 pipes may cost several thousand RMB per ton, while higher-grade pipes can reach tens of thousands of RMB per ton, depending on specifications and market conditions.
Mechanical Performance
PSL1 pipeline pipes typically meet API 5L's basic requirements for yield and tensile strength, with yield strength ranging from 240 MPa to 550 MPa, depending on the grade (e.g., X42, X52, etc.). These properties are sufficient for most conventional applications, such as city gas pipelines or oil gathering systems. However, compared to PSL2 pipes, PSL1 pipes may have weaker impact toughness and fracture toughness.
PSL2 pipes require stricter impact testing and non-destructive inspection (NDT) to ensure safety in harsh environments (e.g., low-temperature or high-pressure conditions). PSL1 pipes are better suited for mild climates and low-pressure conditions, while PSL2 pipes are used in extreme environments, such as Arctic regions or deep-sea pipelines.
Specification
Size : OD:406-1422.40mm WT:1.65-40mm, Length: 6mtr-20mtr
Standard & Grade :API 5L PSL1./ PSL2. GR.B,X42, X45, X50, X60, X60, X65, X70, X80
Ends:Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
Coating: 3PE Coating;3PP Coating;FBE Coating;Epoxy Coating;Special Painting
Materials and Manufacture
The steel for both seamless and welded pipe shall be made by one or more of the following processes: open-hearth, electric furnace, or basic-oxygen. The weld seam of electric-resistance welded pipe in Grade B shall be heat treated after welding.
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Chemical Requirements |
Type S (seamless) |
Type E |
Type F |
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Download Chart |
(electric- resistance welded) |
(furnace- welded pipe) |
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Grade A |
Grade B |
Grade A |
Grade B |
Grade A |
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Carbon max. % |
0.25 |
0.30* |
0.25 |
0.30* |
0.3 |
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Manganese % |
0.95 |
1.2 |
0.95 |
1.2 |
1.2 |
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Phosphorous, max. % |
0.05 |
0.05 |
0.05 |
0.05 |
0.05 |
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Sulfur, max. % |
0.045 |
0.045 |
0.045 |
0.045 |
0.045 |
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Copper, max.% |
0.40 |
0.40 |
0.40 |
0.40 |
0.4 |
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Nickel, max. % |
0.40 |
0.40 |
0.40 |
0.40 |
0.4 |
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Chromium, max. % |
0.40 |
0.40 |
0.40 |
0.40 |
0.4 |
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Molybdenum, max. % |
0.15 |
0.15 |
0.15 |
0.15 |
0.15 |
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Vanadium, max. % |
0.08 |
0.08 |
0.08 |
0.08 |
0.08 |
GNEE API 5L PSL1 PSL2 LSAW steel pipe for sale
