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Help CenterAPI 5L X52 Carbon Steel Seamless Pipe, 4 Inch NPS, 12.5mm Wall Thickness, 12m Random Length
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Hemaokang Steel (Shandong) Co., Ltd. is a reliable manufacturer and exporter of high-grade steel pipes, backed by an annual export value of US$50–100 million and a dedicated team of 51–100 professionals. Our API 5L X52 Carbon Steel Seamless Pipe, 4 Inch NPS, 12.5mm Wall Thickness, 12m Random Length is engineered to meet the rigorous demands of oil, gas, and structural applications. With ISO9001 quality management certification, we ensure every pipe delivers consistent strength, dimensional accuracy, and long service life. This product combines superior mechanical properties with cost-effective performance, making it a top choice for pipeline projects worldwide.
Manufactured from premium carbon steel under strict API 5L specifications, the X52 grade offers excellent yield strength (360 MPa min) and tensile strength (460 MPa min), suitable for medium-pressure transmission lines and structural use. The seamless construction eliminates weld seams, enhancing reliability under high pressure and corrosive environments. Each pipe is produced with a 12.5mm heavy wall thickness, providing enhanced durability and resistance to external loads.
Key Features & Technical Specifications
- Standard & Grade: API 5L X52 (L360) – suitable for pipeline transportation systems as per ISO 3183.
- Size & Dimensions: 4 Inch NPS (Nominal Pipe Size, OD 114.3 mm) with 12.5 mm wall thickness (Schedule 160 approximate).
- Length: Random length up to 12 meters (38–40 ft), customizable upon request.
- Manufacturing Process: Seamless – hot rolled or cold drawn to ensure uniform wall thickness and superior surface finish.
- End Finish: Plain ends (standard) or beveled ends for welding; optional threading or coupling.
- Surface Coating: Black oiled, varnished, or anti-corrosion coatings (e.g., FBE, 3LPE) available on request.
- Testing & Inspection: Hydrostatic testing, ultrasonic inspection, chemical analysis, and mechanical property verification per API 5L requirements.
Typical Mechanical Properties (API 5L X52)
| Property | Value | Remarks |
|---|---|---|
| Yield Strength (min) | 360 MPa (52,200 psi) | Ensures safe working pressure |
| Tensile Strength (min) | 460 MPa (66,700 psi) | High ductility |
| Elongation (min) | 21% (2 in. gauge) | Good formability |
| Carbon Content (max) | 0.26% | Excellent weldability |
| Hydrostatic Test Pressure | Calculated per API 5L (min. 2,500 psi) | 100% tested |
Advantages & Customer Benefits
- High Strength-to-Weight Ratio: The X52 grade delivers optimal strength for medium-pressure pipelines without excessive material weight, reducing transportation and installation costs.
- Seamless Reliability: No welded joints means uniform wall thickness and no weak points, ideal for high-pressure gas and oil transmission as well as corrosive environments.
- Heavy Wall Durability: 12.5mm thickness provides extra protection against external damage, suitable for buried or offshore applications where mechanical loads are significant.
- Global Compliance: Manufactured under ISO9001 quality system and API 5L standard, ensuring acceptance in North America, South America, Europe, Middle East, Africa, and Asia markets.
- Customizable Options: End finishes, coatings, and lengths can be tailored to match your project requirements – simply consult our sales team.
- Consistent Supply: As a company with annual export value exceeding US$50 million, Hemaokang Steel maintains stable inventory and reliable logistics to meet large-volume orders.
Trust & Quality Assurance
Since our establishment in 2025, Hemaokang Steel (Shandong) Co., Ltd. has rapidly grown into a trusted steel pipe supplier with a team of 51–100 experienced professionals. Our products have been exported to over 10 major regions including North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, East Asia, Western Europe, and Central America. We hold ISO9001:2015 certification for quality management, and each pipe batch undergoes rigorous third-party inspection upon request. With a strong focus on customer satisfaction, we offer competitive pricing, fast delivery, and after-sales technical support. When you choose our API 5L X52 seamless pipes, you invest in durability, safety, and performance that keeps your projects on schedule and within budget.
Contact Hemaokang Steel today to discuss your specific pipe requirements. Our engineers are ready to provide detailed technical datasheets, quotations, and sample orders. We look forward to building a long-term partnership with you.
Frequently Asked Questions (FAQ)
1. What does API 5L X52 mean? What is the difference between X42, X52, X60?
API 5L X52 (also known as L360) denotes a minimum yield strength of 52,000 psi (360 MPa). Higher numbers (X60, X65) indicate increased strength, while lower numbers (X42) offer less. X52 is a common choice for medium-pressure oil and gas lines due to its balanced strength and weldability.
2. Can this pipe be used for high-pressure steam or water lines?
While the pipe is primarily designed for hydrocarbon transport, it can be used for other fluid services if the operating pressure and temperature are within the safe limits derived from API 5L. We recommend consulting a piping engineer for non-standard applications.
3. Is the pipe supplied with mill test certificates?
Yes, each bundle includes a Mill Test Certificate (MTC) with chemical composition and mechanical properties, conforming to API 5L and EN 10204 3.1. Third-party inspection (e.g., SGS, BV) is available at extra cost.
4. What is the maximum operating pressure for a 4-inch X52 pipe with 12.5mm wall?
Using API 5L formula (Barlow's formula) with design factor 0.72, the theoretical maximum allowable pressure is approximately 2,800 psi for seamless pipe. Actual safe working pressure depends on service conditions, temperature derating, and applicable code. Contact us for a detailed calculation.
5. Do you offer shorter lengths or custom lengths?
Yes, we can supply random lengths up to 12m, and we also offer fixed lengths (e.g., 6m, 9m, 12m) or other custom lengths based on your order quantity. Please specify your requirement when ordering.
6. What types of coatings are available for corrosion protection?
Standard coating is black oiled anti-rust. Optional coatings include fusion-bonded epoxy (FBE), three-layer polyethylene (3LPE), and galvanized (hot-dip). Lead times and costs vary – our sales team will advise the best option for your project.
7. What is the minimum order quantity (MOQ)?
Our MOQ for seamless pipes typically starts at 10 tons for common sizes, but we can accommodate smaller trial orders for new customers. For large-volume projects, we offer volume discounts and flexible payment terms.
8. How do you ensure the quality meets API 5L requirements?
Our production is controlled under ISO9001 quality system. Each pipe undergoes hydrostatic testing, ultrasonic inspection (optional), dimensional checks, and visual inspection. Random samples are taken for tensile and bend tests. All records are traceable.
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