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API5L seamless steel pipe
Core value: Ensure the safe, efficient and continuous transportation of oil, gas and other media under high pressure, long distance, complex geological and climatic conditions.
Core technology: Adopt seamless steel pipe manufacturing technology (hot rolling, cold drawing, etc.), the pipe body has no welds, which fundamentally eliminates the potential weak link and leakage risk point of the weld, ensuring the integrity and high integrity of the pipeline.
Core characteristics: It has high strength, high toughness, excellent compression resistance, deformation resistance and environmental stress cracking resistance, and can meet strict chemical composition and mechanical property requirements.
Why choose API5L seamless steel pipe?
Ultimate safety
Seamless structure eliminates hidden dangers of welds, making high-pressure transmission safer.
Excellent performance
High strength and high toughness, easily coping with geological movements and extreme climates.
Long life
Excellent corrosion resistance, significantly extending the service life of pipelines and reducing the cost of the entire life cycle.
Global access
Complies with the internationally authoritative API 5L standard and is the access permit for international energy projects.
Strictly follow API 5L standards
The API 5L standard provides extremely detailed and mandatory regulations on the materials, manufacturing processes, dimensional tolerances, mechanical properties, test methods, inspection rules and markings of pipeline steel pipes to ensure the consistency and reliability of products worldwide.
Analysis of key standard requirements
1. Steel grade: API 5L standard defines multiple strength grades, the most common ones are:
Analysis of key standard requirements
1. Steel grade: API 5L standard defines multiple strength grades, the most common ones are:
PSL1 (Product Specification Level 1): Basic requirements, suitable for general working conditions.
PSL2 (Product Specification Level 2): More stringent requirements, including higher impact toughness, stricter chemical composition control, more comprehensive non-destructive testing (usually requiring 100% ultrasonic and eddy current testing), more detailed marking and traceability. Suitable for more severe or critical environments (such as the Arctic, deep sea, and highly acidic environments).
| Steel Grade | PSL1 Minimum Yield Strength (MPa) | PSL2 Minimum Yield Strength (MPa) | Main Characteristics |
|---|---|---|---|
| A | 210 | - | Basic strength, general low-pressure transmission. |
| B | 245 | 245 | Most commonly used, cost-effective, widely used in medium and low pressure onshore pipelines. |
| X42 | 290 | 290 | Medium intensity demand. |
| X46 | 320 | 320 | Medium intensity demand. |
|---|---|---|---|
| X52 | 360 | 360 | Widely used, suitable for high pressure main lines. |
| X56 | 390 | 390 | High strength requirements. |
| X60 | 415 | 415 | Mainstream high strength, first choice for long-distance, high-volume pipelines. |
|---|---|---|---|
| X65 | 450 | 450 | Main steel grade for harsh environments such as deep sea and polar regions. |
| X70 | 485 | 485 | Ultra-high strength, reduced wall thickness/weight, significant economy. |
2. Dimensions:
Outside diameter (OD): Wide range, from small diameter of a few millimeters to large diameter of more than 1000mm, can be produced to meet different flow requirements. Common standard outside diameters are according to ASME B36.10M or specified by customers.
Wall thickness (WT): Calculated and determined according to design pressure, steel grade and pipe diameter, directly affecting pressure bearing capacity. Commonly expressed as Schedule Number (such as Sch 40, Sch 80, Sch 160), wall thickness value (mm or inch) or weight (kg/m).
Length: Usually fixed length (such as 6m, 12m) or variable length (R1, R2, R3).
| Parameters | Usual range (typical value) | Description |
|---|---|---|
| Outside diameter (OD) | 1/8" to 24" (10.3mm to 610mm+) | Covering small branch lines to large main pipelines |
| Wall thickness (WT) | Sch 10S to Sch XXS (or 1.24mm ~ 50mm+) | Designed according to pressure, steel grade, pipe diameter |
| Length | Single: 6m, 11.8m, 12m; or R1 (4.5-7m), R2 (7-10.5m), R3 (≥10.5m) | Fixed length is convenient for construction, and non-fixed length can reduce waste |
3. Chemical composition and mechanical properties: The standard has clear restrictions on the content of elements such as C, Mn, P, S, Si, etc. in each steel grade (PSL2 is stricter). Mechanical properties (yield strength YS, tensile strength TS, elongation EL) must meet the standards, and PSL2 also requires strict Charpy V-notch impact test (CVN) temperature and absorbed energy value.
4. Non-destructive testing (NDT): PSL1 requires sampling inspection, and PSL2 requires 100% pipe ultrasonic testing (UT) and 100% pipe end or full-length eddy current testing (ET) or magnetic particle testing (MT) to ensure that there are no harmful defects.
5. Hydrostatic test: Each steel pipe needs to be subjected to a hydrostatic test. The test pressure is calculated according to the standard formula, and the pressure holding time is sufficient to ensure the pressure-bearing and sealing performance of the pipe body.
6. Traceability: A complete marking system (steel stamp, inkjet coding, label) and document records (material report MTC, certificate of conformity CoC) ensure that the information of each steel pipe is clear and traceable.
Widely used
1. Oil and gas transportation
Long-distance oil/gas trunk lines: Onshore and submarine trunk pipelines, transporting high-pressure crude oil, refined oil, and natural gas (X52, X60, X65, X70 steel grades are the main ones).
Gathering pipelines: Branch pipelines connecting the wellhead to the processing station or the trunk line.
Urban gas pipeline network: Medium- and high-pressure transmission and distribution pipeline network (commonly used B, X42, X52 steel grades).
Shale gas/tight oil development: High-pressure pipelines used for fracturing fluid transportation and production fluid gathering.
2. Oil and gas exploration and development
Although API 5L is mainly for transmission pipes, the base pipes of oil well pipes (API 5CT) produced by seamless process, such as casing and oil pipes, are also often made of similar processes and materials, and are subjected to high pressure, high load and corrosive environment in drilling and production operations.
3. Chemical and petrochemical industry
Process pipelines for transporting high-temperature and high-pressure, flammable and explosive, toxic or highly corrosive chemical raw materials, intermediates and products (often using high steel grade or special materials/linings).
Thermal pipelines (steam pipelines).
4. Energy and Power
High-pressure seamless pipes, steam pipes, and water supply pipes for boilers in thermal power plants.
Conventional islands and some auxiliary pipelines of nuclear islands in nuclear power plants (must meet nuclear grade specifications).
Pipelines for new energy projects such as biomass energy and geothermal energy.
High-pressure hydraulic support systems for large bridges and buildings.
Pipe piles for piling (partial requirements).
High-pressure gas (such as air separation equipment) transportation.
Professional Buying Guide
1. Identify core requirements
Transmission media: oil, natural gas (ingredients? Containing H2S/CO2?), chemicals (corrosive?), water, steam (temperature and pressure?).
Design parameters: working pressure, working temperature, design life, safety factor.
Service environment: land (soil corrosive?), seabed (water depth, temperature), extremely cold/high temperature areas, seismic zones? Is HIC/SSC resistance required?
Steel grade: Calculate the required minimum yield strength based on the design pressure and pipe diameter, combined with environmental factors (such as low temperature toughness, SSC resistance requirements) and economic selection (such as commonly used X52, X60, X65).
2. Size
Outer diameter: Determined by the design flow rate and economic flow rate.
Wall thickness: Calculated and determined according to the standard formula (such as Barlow formula) based on the design pressure, steel grade, outer diameter, corrosion allowance, and considering manufacturing tolerances. Wall thickness uniformity is critical.
Length: Consider transportation restrictions, on-site construction conditions (such as welding station length) and reduce waste.
End form: Welded connections use flat ends (PE) or bevel ends (BE); threaded connections require threads and couplings (TC).
3. Strict control of material and manufacturing quality
PSL level: PSL2 is strongly recommended for critical or severe working conditions. Its stricter toughness, non-destructive testing and traceability requirements provide higher safety assurance.
Material certification: Suppliers must be required to provide a material report (MTC) that complies with the API 5L standard, including furnace batch number, chemical composition, mechanical properties, heat treatment, test results, etc.
Factory audit and certification: Manufacturers holding API Monogram (API monogram license) are preferred, which is the most direct proof of their API 5L production qualifications and quality system. Large projects should consider factory audits.
Third-party inspection: For major projects or high-demand pipes, hiring independent third-party inspection agencies (such as SGS, BV, DNV) to conduct on-site supervision (PMI) and inspection (size, appearance, non-destructive testing, water pressure testing, etc.) is an effective means to ensure quality.
Choose us: your trusted strategic partner for API5L seamless steel tube
As a professional trader with many years of experience in the steel industry, we not only provide products, but also strive to be a solid backing for the success of your project: our product range covers API 5L PSL1/PSL2 full range of steel grades (A/B/X42-X80) and full size specifications (outer diameter 1/8" - 24" and above, wall thickness SCH 10S - XXS) to meet your diverse needs.
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