Yuan Steel is a leading supplier of API 5L seamless pipe and industrial seamless carbon steel pipes for critical applications worldwide. Our seamless range covers multiple international standards including API 5L (Grade B, X42, X52, X60, X65, X70), ASTM A106 (Grade B/C), and ASTM A53 (Grade B), ensuring the right solution for every project requirement.
Key international standards
ASTM A106 Gr.B/C (high-temp service, –29 °C to 425 °C)
API 5L PSL-1/PSL-2 Gr.B, X42-X80 (line pipe, sour-service options)
ASTM A53 Gr.B (general/pressure, –29 °C to 425 °C)
ASTM A519 SAE 1020/1045 (mechanical tubing)
EN 10210/10216-1 P235GH-P265GH (structural & pressure)
GB/T 8163 (fluid), GB 3087 (medium-pressure boiler), GB 5310 (high-pressure boiler)
Our API 5L seamless pipe is manufactured to the American Petroleum Institute specification, the global standard for line pipe used in oil and gas transmission systems. Available in both PSL1 and PSL2 quality levels.
| API 5L Seamless Line Pipe | |
| Standard | API 5L / ISO 3183 |
| PSL Level | PSL1, PSL2 |
| Grades | Grade B, X42, X46, X52, X56, X60, X65, X70 |
| Size Range | OD 21.3mm – 660mm (½" – 26") | WT 2mm – 60mm |
| Delivery Condition | As-rolled (R), Normalized (N), Quenched & Tempered (Q), Thermomechanical (M) |
| Sour Service Option | Available upon request (with additional SSC testing per NACE MR0175) |
| Typical Applications | Oil & gas gathering lines, transmission pipelines, refinery utilities, offshore risers |
| Chemical Composition (Typical Values) | |||||
| Grade | C (Max) | Mn (Max) | P (Max) | S (Max) | CE (Max) |
| API 5L Grade B | 0.28% | 1.20% | 0.030% | 0.030% | 0.42% |
| API 5L X52 | 0.26% | 1.40% | 0.030% | 0.030% | 0.43% |
| API 5L X60 | 0.26% | 1.40% | 0.030% | 0.030% | 0.45% |
| Mechanical Properties | |||
| Grade | Yield Strength (Min) | Tensile Strength (Min) | Elongation |
| API 5L Grade B | 35,500 psi / 245 MPa | 60,200 psi / 415 MPa | ≥ 22% |
| API 5L X52 | 52,200 psi / 360 MPa | 66,700 psi / 460 MPa | ≥ 21% |
| API 5L X60 | 60,200 psi / 415 MPa | 75,400 psi / 520 MPa | ≥ 20% |
In addition to API 5L, we supply a full range of ASTM A106 seamless pipe for high-temperature service and ASTM A53 seamless pipe for general pressure and mechanical applications.
| ASTM A106 Seamless Carbon Steel Pipe | |
| Standard | ASTM A106 / ASME SA106 |
| Grades | Grade B, Grade C |
| Temperature Range | -29°C to 425°C (-20°F to 800°F) |
| Size Range | OD 6mm – 1220mm (¼" – 48") | WT 0.5mm – 160mm |
| Typical Applications | Boilers, superheaters, refineries, high-pressure process lines, power plants |
| ASTM A53 Seamless Pipe | |
| Standard | ASTM A53 / ASME SA53 |
| Type | Type S (Seamless) |
| Grades | Grade A, Grade B |
| Temperature Range | -29°C to 425°C (-20°F to 800°F) |
| Size Range | OD 6mm – 660mm (¼" – 26") | WT 1mm – 60mm |
| Typical Applications | General pressure service, mechanical applications, air, water, steam, structural |
| Why Choose Seamless Pipe? | |
| No Longitudinal Weld Seam | The absence of a weld seam eliminates the weakest point of welded pipe, providing uniform strength and pressure capacity throughout the pipe length. |
| Superior High-Temperature Performance | Seamless pipe maintains mechanical integrity at elevated temperatures up to 425°C, making it essential for boilers, superheaters, and refinery process lines. |
| Excellent Pressure Rating | Uniform wall thickness and consistent material properties give seamless pipe higher pressure ratings compared to welded alternatives of the same grade and wall. |
| Good Formability & Weldability | Despite being seamless, our pipes offer excellent ductility for bending, flanging, and coiling, while remaining weldable for field joints when required. |
| Wide Range of Grades & Standards | From API 5L Grade B to X70, ASTM A106 Gr.B/C, ASTM A53 Gr.B, and specialty grades like A333 Gr.6 for low-temperature service. |
| Full Traceability | Each pipe is marked with heat number, grade, and size, with complete Mill Test Reports (MTRs) documenting chemical and mechanical properties. |
1. Customized Technical Solutions
We offer comprehensive customization including OD, WT, and length adjustments, supplemented with specialized end finishing and anti-corrosion coatings. This technical flexibility makes our ASTM A106 seamless carbon steel pipe ideal for various project specifications.
2. Rigorous Quality Assurance
Implementing strict quality control from material selection to final inspection, each Industrial Seamless Carbon Steel Pipe undergoes multiple NDT tests and required testing, guaranteeing consistent compliance with industry standards and project requirements.
3. Professional Technical Support
Our engineering team provides end-to-end technical services, from product selection to installation guidance, ensuring optimal performance of every API 5L seamless carbon steel pipe in your operations.
4. Proven Product Excellence
Our API 5L Seamless Pipe strictly complies with standards, delivering superior strength and pressure capacity while maintaining excellent toughness in low-temperature environments. The enhanced corrosion resistance ensures reliable performance even in demanding service conditions.
5. Optimized Cost Efficiency
Through vertical integration and streamlined supply chain management, we maintain competitive pricing while ensuring product quality, providing clients with superior value line pipe solutions.
Oil & gas: casing, tubing, gathering lines, subsea jumpers.
Power: boiler water walls, super-heater coils, steam headers.
Refining & chemical: hydro-cracker, HF alky, high-pressure hydrogen lines (XS/XXS).
Mechanical: hydraulic cylinders, drill rods, auto drive-shafts, crane jibs.
Construction: arch bridge chords, roller coasters, jack-up leg chords.
Hainan Yuan Steel Pipe Supply Chain Co.,Ltd is one of the leading Industrial Seamless Carbon Steel Pipe distributors.
If you want to buy or import best high-quality Industrial API 5L seamless carbon steel pipe , please kindly feel free to contact us.
