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Help CenterASTM A106 Gr.B Seamless Carbon Steel Pipe 1-24 Inch SCH40 SCH80 Custom Length Black Surface
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Hemaokang Steel (Shandong) Co., Ltd. is an export-oriented manufacturer located in Liaocheng, Shandong, China, and we supply ASTM A106 Gr.B seamless carbon steel pipe in nominal sizes ranging from 1 to 24 inches. These pipes are offered in SCH40 and SCH80 wall thickness, with a black surface finish and custom lengths to meet the requirements of pipelines, mechanical installations, and structural projects. With a team of 51-100 employees and an annual export value of US$50-100 million, we are committed to providing dependable supply and consistent product quality for global buyers.
ASTM A106 is a standard specification for seamless carbon steel pipes used in high-temperature service. Grade B is widely specified because it combines good strength, weldability, and ductility for industrial piping systems. The seamless manufacturing process creates a pipe body without a longitudinal seam, which improves pressure integrity and reduces the risk of weld-related defects.
- Seamless construction: No longitudinal weld seam, providing uniform strength and pressure resistance across the pipe body.
- ASTM A106 Gr.B material: Designed for high-temperature service and suitable for bending, flanging, and welding operations.
- Wide size coverage: Nominal sizes from 1 inch to 24 inch, covering SCH40 and SCH80 wall thickness schedules.
- Black surface finish: Helps protect the pipe surface during handling, storage, and shipping; can be coated or painted as needed.
- Custom lengths: Pipes can be supplied in fixed, double, or custom lengths to reduce material waste on site.
- Flexible end preparation: Plain ends, beveled ends, or other end types are available according to project specifications.
- Reliable documentation: Mill test certificates and inspection reports can be provided to support quality traceability.
| Parameter | Value |
| Standard | ASTM A106 |
| Grade | Gr.B |
| Size Range | 1 - 24 inch NPS |
| Wall Thickness | SCH40 / SCH80 |
| Length | Custom; commonly 5.8 m, 6 m, 11.8 m, 12 m or as required |
| Surface | Black surface / black painted finish |
| Pipe End | Plain end, beveled end, or special preparation on request |
| Packing | Bundles, seaworthy export packing, or as per customer requirement |
| Inspection | Mill test certificate, dimensional inspection, visual inspection |
The table below lists typical minimum mechanical requirements for ASTM A106 Gr.B seamless carbon steel pipe. Final test results should be confirmed through the supplied mill test certificate.
| Mechanical Property | Typical Value |
| Tensile Strength | 415 MPa min |
| Yield Strength | 240 MPa min |
| Chemical Composition | Per ASTM A106 requirements |
This seamless carbon steel pipe is suitable for both pressure and mechanical applications, especially in environments where the pipe may be exposed to elevated temperatures. The combination of SCH40 and SCH80 thicknesses gives buyers the flexibility to choose a heavier wall for higher pressure service or a lighter wall for general process piping. Since the pipe is produced without a seam, maintenance and inspection requirements are often simpler than welded alternatives, and the risk of hidden weld defects is reduced.
The black surface is a mill finish commonly applied to carbon steel pipe. It provides a basic protective layer and gives the pipe a uniform dark appearance. This finish is especially suitable for projects that plan to apply external insulation, wrapping, or coating at the job site. By ordering custom lengths, contractors can minimize cutting loss, reduce the number of butt welds, and shorten installation time. Our production planning team can coordinate to supply exact lengths for piping layouts, pipe racks, and mechanical assemblies.
- High-temperature and high-pressure piping systems
- Boiler and superheater lines
- Oil and gas process piping
- Refinery and petrochemical plants
- Water and steam pipelines
- Structural and mechanical components
- Power generation equipment
- General industrial plant construction
Hemaokang Steel operates with an ISO9001 quality management system and applies routine control measures during handling, storage, and preparation for shipment. Each order can be accompanied by mill test certificates and required shipping documents. Additional inspection options are available upon request:
- Chemical analysis and tensile testing
- Hydrostatic testing (available upon request)
- Ultrasonic or non-destructive testing (available upon request)
- Third-party inspection by buyer's designated inspector (available upon request)
- Factory-based supply from Shandong, China, with direct communication between buyer and supplier.
- Annual export value of US$50-100 million reflects export experience and order handling capacity.
- A team of 51-100 employees supports flexible order processing and timely coordination.
- Export via Qingdao port simplifies shipping to European, American, Asian, African, and Oceanian markets.
- ISO9001 quality management system supports consistent operational control and traceability.
We have supplied carbon steel pipe products to buyers in North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, Western Europe, Central America, Northern Europe, Southern Europe, South Asia, and the domestic market. From our location in Liaocheng, Shandong, we can coordinate production, inspection, packing, and port delivery to meet your project schedule. Contact us with your required size, wall thickness, length, and destination port, and our sales team will provide a clear quotation and delivery proposal.
Q: Is this pipe suitable for high-temperature service?
A: ASTM A106 is a standard for high-temperature service, and Gr.B is commonly used for steam, water, oil, and gas piping in industrial plants. Confirm your operating temperature and pressure with an engineer to select the correct wall thickness.
Q: What is the difference between SCH40 and SCH80?
A: SCH80 has a thicker wall than SCH40 at most nominal sizes, so it offers a higher pressure rating and additional corrosion allowance. SCH40 is often selected for general process piping, while SCH80 is used where higher strength or durability is needed.
Q: Can I order custom lengths?
A: Yes, custom lengths are available. Common lengths are 5.8 m, 6 m, 11.8 m, and 12 m, but we can also supply exact lengths according to your drawings or installation plan.
Q: What does black surface mean?
A: It usually means the pipe has a black mill finish or black paint/varnish layer on the outside surface. This finish provides temporary protection during storage and transit and can be coated or painted after installation.
Q: Do you provide test certificates?
A: Yes, mill test certificates and related inspection documents can be provided. Additional tests such as hydrostatic or non-destructive testing are available upon request.
Q: Can the pipe ends be beveled?
A: Yes, beveled ends can be prepared for butt welding, which helps improve joint quality and welding efficiency. Plain-end pipes are also available.
Q: Do you support export shipments from Qingdao?
A: Yes, we ship from Qingdao port and can arrange container or bulk loading depending on the order volume and destination. Our team can help plan the most suitable transportation method.
Q: How can I get a quotation?
A: Send us the required nominal size, schedule, length, quantity, and destination port. We will confirm the specification and provide a quotation based on current production availability.
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