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Help CenterSeamless Steel Pipe With 2-Year Warranty, Mill Test Report Included, ASTM A53 Grade B, 4 Inch Sch 40, 12m Length
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Welcome to Hemaokang Steel (Shandong) Co., Ltd. – your reliable partner for high-quality seamless steel pipes. As a young but rapidly growing enterprise founded in 2025, we have already achieved an annual export value of US$50 million to US$100 million, serving markets across North America, South America, Europe, Asia, Africa, and Oceania. Our ASTM A53 Grade B seamless steel pipe, 4 inch Sch 40, 12m length is a top choice for both structural and pressure applications. With a 2-year warranty and a Mill Test Report included, you can trust the material integrity and performance of every pipe we deliver.
This pipe is manufactured using advanced hot-rolling or cold-drawing processes, ensuring a uniform wall thickness and excellent mechanical properties. The ASTM A53 Grade B specification covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8 to NPS 26. Our product strictly complies with this standard, guaranteeing reliable strength, ductility, and weldability. Whether you need it for oil and gas transmission, plumbing, structural support, or mechanical applications, this pipe delivers consistent performance under demanding conditions.
Key Features & Technical Specifications
- Seamless Construction: No welded seam, reducing the risk of leakage and failure. Ideal for high-pressure and high-temperature applications.
- ASTM A53 Grade B Compliance: Meets chemical and mechanical requirements for carbon steel pipes. Minimum yield strength of 35,000 psi (240 MPa) and tensile strength of 60,000 psi (415 MPa).
- 4 Inch Nominal Size (Schedule 40): Outer diameter 4.500 inches (114.3 mm), wall thickness 0.237 inches (6.02 mm). Suitable for standard pressure ratings.
- 12 Meter Length: Standard length of 12 meters (40 feet), reducing the number of connections needed. Custom lengths available upon request.
- Mill Test Report Included: Each bundle is accompanied by a certified MTR documenting chemical composition, mechanical properties, and hydrostatic test results.
- 2-Year Warranty: Covers manufacturing defects. Our commitment to quality ensures your investment is protected.
- ISO9001:2015 Certified: Our production processes are managed under an ISO9001 quality management system, ensuring consistency and traceability.
- Surface Treatment: Black plain finish, oiled or varnished to prevent rust during transit. End caps are fitted to protect the threads (if applicable) or ends.
Product Parameters (Table)
| Parameter | Value |
| Standard | ASTM A53 Grade B |
| NPS (Nominal Pipe Size) | 4 inch (DN100) |
| Schedule | Sch 40 |
| Outside Diameter | 114.3 mm (4.500 in) |
| Wall Thickness | 6.02 mm (0.237 in) |
| Length | 12 m (40 ft) ± 50 mm |
| Yield Strength (min) | 240 MPa (35,000 psi) |
| Tensile Strength (min) | 415 MPa (60,000 psi) |
| Elongation (min) | 18% (in 2 in) |
| Testing | Hydrostatic, Bend, Flattening |
Customer Benefits
- Reliable Quality: With a Mill Test Report and 2-year warranty, you can verify the material integrity and have peace of mind.
- Cost Efficiency: 12-meter lengths reduce welding and coupling costs compared to shorter pipes. Seamless design lowers maintenance expenses.
- Versatility: Suitable for water, oil, gas, steam, and structural applications. Meets both industrial and commercial requirements.
- Global Standards: ASTM A53 Grade B is widely accepted in North America and many other regions, ensuring compatibility with existing systems.
- Customizable Options: We offer different lengths, surface treatments (galvanized, black, etc.), and packaging (bundles, crates, or containers) to meet your specific needs.
Why Choose Hemaokang Steel?
Although our company was established in 2025, we have quickly built a strong reputation backed by 51–100 experienced employees and an annual export value of US$50–100 million. Our factory is located in Liaocheng, Shandong, China – a renowned steel production hub. We hold ISO9001:2015 certification, ensuring that every pipe undergoes rigorous quality control from raw material sourcing to final inspection. Our mill test reports are thorough and transparent, giving you full traceability.
We serve a diverse global market, including North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, East Asia, Western Europe, Central America, Northern Europe, Southern Europe, South Asia, and the domestic market. Our team is dedicated to providing prompt responses, competitive pricing, and reliable logistics. Whether you need a small batch for a local project or a container load for a large-scale pipeline, we are ready to deliver.
Contact us today to request a quote or discuss your specific requirements. With our 2-year warranty and Mill Test Report included, you can buy with confidence. Let Hemaokang Steel be your trusted partner for seamless steel pipe solutions.
Frequently Asked Questions (FAQ)
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Q: What is the difference between seamless and welded steel pipe?
A: Seamless pipes are manufactured without any welding seam, providing higher strength and better resistance to pressure and corrosion. They are preferred for high-pressure applications. Welded pipes have a longitudinal or spiral seam and are generally more economical for lower-pressure uses. -
Q: Can you provide custom lengths other than 12 meters?
A: Yes, we can customize lengths according to your project requirements. Typical options include 6m, 9m, 12m, or random lengths. Please specify your desired length when ordering. -
Q: How is the pipe surface protected against rust during shipment?
A: Our standard treatment is a black plain finish with oil or varnish coating. We also apply plastic end caps to protect the ends. For additional protection, we offer galvanized surface or wrapping with anti-rust paper. Please inquire about options. -
Q: What is the warranty coverage?
A: We offer a 2-year warranty covering manufacturing defects in material and workmanship. The warranty does not cover damage caused by improper installation, misuse, or external factors. The Mill Test Report provides further assurance of material quality. -
Q: Do you provide third-party inspection services?
A: Yes, we can arrange for third-party inspection by agencies such as SGS, BV, or TÜV upon request. The cost of inspection will be quoted separately. Our mill test report is also available for your verification. -
Q: What is the minimum order quantity (MOQ)?
A: Our MOQ for this size is typically 1 ton (approximately 10 pieces of 12m length). For smaller quantities, please contact us to discuss availability and pricing. -
Q: Are these pipes suitable for underground water or gas lines?
A: Yes, ASTM A53 Grade B seamless pipes are commonly used for underground transmission of water, gas, and oil. However, for corrosive environments, we recommend a protective coating or galvanized finish. Please consult with our technical team for specific applications. -
Q: How can I verify the Mill Test Report?
A: Each shipment comes with a certified Mill Test Report that includes the chemical composition, mechanical properties, and hydrostatic test results. The report is traceable to the heat number and production batch. You can cross-check the data with the standards. If needed, we can also provide a sample report before shipment.
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