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Help CenterGalvanized Pipe for Oil Transmission DN250 Sch40 API 5L Grade B
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Welcome to Hemaokang Steel (Shandong) Co., Ltd. – Your reliable partner for high-quality galvanized pipes. Our Galvanized Pipe for Oil Transmission DN250 Sch40 API 5L Grade B is engineered to meet the rigorous demands of the oil and gas industry. Manufactured with precision and backed by our ISO9001-certified quality management system, this pipe offers superior corrosion resistance, excellent mechanical properties, and long service life. With an annual export value exceeding US$50 million and a global footprint across North America, South America, Europe, and Asia, we are committed to delivering products that ensure the safety and efficiency of your oil transmission projects.
Product Overview
This galvanized pipe is specifically designed for the transportation of oil and other hydrocarbon fluids. It complies with the API 5L Grade B specification, which is the industry standard for line pipe. The DN250 (10 inches) nominal diameter and Schedule 40 wall thickness provide a balanced combination of flow capacity and pressure containment. The hot-dip galvanized coating ensures robust protection against corrosion in both above-ground and buried installations.
Key Features & Benefits
- API 5L Grade B Compliance: Meets strict chemical and mechanical requirements for oil and gas pipelines, ensuring reliable performance under high pressure.
- Hot-Dip Galvanized Coating: Provides excellent corrosion resistance, extending the pipe's service life even in harsh environments such as coastal areas or acidic soils.
- DN250 / Sch40 Dimensions: Optimized for medium-to-high flow rates with a standard wall thickness suitable for typical oil transmission pressures.
- Weldability: Beveled ends facilitate easy field welding, reducing installation time and labor costs.
- Customizable Lengths: Available in standard 6m or 12m lengths, or can be cut to your specific requirements.
- Rigorous Quality Control: Each pipe undergoes hydrostatic testing, dimensional inspection, and coating thickness verification to ensure defect-free products.
Technical Specifications
| Parameter | Value |
| Nominal Diameter (DN) | 250 mm (10 inches) |
| Wall Thickness (Schedule) | 40 (approx. 9.27 mm for 10" pipe) |
| Material Grade | API 5L Grade B (PSL1) |
| Yield Strength (min) | 35,000 psi (241 MPa) |
| Tensile Strength (min) | 60,000 psi (414 MPa) |
| Coating Thickness | ≥ 85 μm (average) |
| End Finish | Beveled (30°–35°) for welding |
| Length | 6m / 12m ± 50mm, or customized |
| Testing | Hydrostatic, Bend, Flattening, NDT |
Why Choose Hemaokang Steel?
Hemaokang Steel (Shandong) Co., Ltd. was established in 2025 but has quickly become a trusted supplier in the global steel market. Our team of 51–100 experienced professionals ensures that every pipe meets the highest standards. We have exported over US$50 million worth of steel products annually, serving diverse markets from Europe to Oceania. Our ISO9001:2015 certification guarantees a robust quality management system, from raw material procurement to final inspection. We also offer flexible customization options, including different lengths, coatings, and packaging, to meet your project-specific needs.
By choosing our galvanized pipe, you are investing in a product that has been rigorously tested for durability and performance. We provide full mill test certificates and third-party inspection reports upon request. Our logistics team ensures timely delivery to any port worldwide, with careful handling to prevent damage during transit.
Frequently Asked Questions (FAQ)
1. What is the difference between API 5L Grade B and other grades?
API 5L Grade B is a standard carbon steel grade for line pipe, offering good weldability and strength for moderate pressure applications. Higher grades like X42 or X52 are used for higher pressure, but Grade B is often sufficient for oil transmission where pressure is not extreme.
2. Can this pipe be used for natural gas transmission?
Yes, API 5L Grade B pipes are commonly used for natural gas, water, and oil. However, you should verify the specific pressure and environmental requirements of your project. The galvanized coating is suitable for gas transmission, but ensure compatibility with any additives.
3. How is the galvanized coating applied?
We use the hot-dip galvanizing process, where the pipe is immersed in molten zinc at approximately 450°C, creating a metallurgically bonded coating that provides superior corrosion protection compared to electro-galvanizing.
4. What is the maximum operating pressure for DN250 Sch40 pipe?
Based on API 5L Grade B, the allowable working pressure for a 10-inch Sch40 pipe is approximately 1,800 psi (12.4 MPa) at ambient temperature, depending on design factors. Please consult our engineering team for specific calculations.
5. Do you provide third-party inspection?
Absolutely. We can arrange inspection by SGS, BV, or any other accredited third-party agency at an additional cost. Mill certificates are provided standard with each shipment.
6. What is the minimum order quantity (MOQ)?
Our standard MOQ for this product is 20 tons. For smaller quantities, please contact us to discuss availability.
7. How long is the delivery time?
For standard specifications (6m/12m length, no special coating), delivery is typically 15–25 days after receiving the deposit. Custom orders may require longer lead time.
8. Is the pipe suitable for underground installation?
Yes, the hot-dip galvanized coating provides excellent protection against soil corrosion. For additional protection, you can also apply wrapping tape or cathodic protection as per project design.
Contact Hemaokang Steel today for a quotation or technical consultation. Let us supply the galvanized pipe that keeps your oil transmission running safely and efficiently.
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