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Help CenterCarbon Steel Seamless Pipe ASTM A53 GR.B SCH80 21.3mm OD Black Annealed
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Hemaokang Steel (Shandong) Co., Ltd. is a professional manufacturer and exporter of carbon steel pipes, with annual export value exceeding US$50 million. Our Carbon Steel Seamless Pipe ASTM A53 GR.B SCH80 21.3mm OD Black Annealed is engineered to meet the rigorous demands of industrial piping systems. Manufactured in our ISO9001-certified facility, this pipe offers superior strength, corrosion resistance, and dimensional accuracy, making it a reliable choice for critical applications worldwide.
This seamless pipe is produced from high-quality carbon steel billets, ensuring uniformity and freedom from weld defects. The black annealed finish provides a clean, scale-free surface that enhances weldability and paint adhesion. With a schedule 80 wall thickness, it delivers exceptional pressure-bearing capacity for high-stress environments.
Key Features & Benefits
- Seamless Construction: No welded seams eliminate weak points, ensuring uniform strength and resistance to pressure and fatigue.
- ASTM A53 GR.B Compliance: Meets international standards for carbon steel pipes, suitable for both pressure and structural applications.
- Schedule 80 Wall Thickness: Provides higher pressure rating and increased durability compared to standard wall pipes.
- Black Annealed Surface: Oxide-free, smooth finish that improves corrosion resistance and facilitates further processing like painting or coating.
- Precise Dimensions: 21.3mm outer diameter with tight tolerances ensures compatibility with standard fittings and flanges.
- Versatile Application: Ideal for oil and gas transmission, steam lines, water distribution, hydraulic systems, and structural supports.
- Customizable Length & End Finish: Available in plain, beveled, or threaded ends, and lengths from 6m to 12m or as required.
Technical Specifications
| Parameter | Value |
|---|---|
| Standard | ASTM A53 GR.B |
| Material | Carbon Steel (Grade B) |
| Outer Diameter | 21.3 mm |
| Wall Thickness (SCH80) | 3.73 mm (approx.) |
| Surface Finish | Black Annealed |
| Length | 6 m (customizable) |
| End Finish | Plain / Beveled / Threaded (optional) |
| Minimum Yield Strength | 240 MPa (35,000 psi) |
| Minimum Tensile Strength | 415 MPa (60,000 psi) |
Why Choose Hemaokang Steel?
With a dedicated team of 51–100 employees and an annual export volume of US$50 million–US$100 million, we have established a strong presence in global markets including North America, South America, Europe, Africa, and Asia. Our ISO9001 certification guarantees consistent quality control from raw material sourcing to final delivery. Each pipe undergoes rigorous inspection including dimensional checks, hydrostatic testing, and surface examination to ensure defect-free products.
We offer competitive pricing, flexible production schedules, and comprehensive after-sales support. Whether you need standard lengths or custom-sized orders, our experienced team is ready to meet your requirements. Trust Hemaokang Steel for your next project – contact us today for a quote or technical consultation.
Frequently Asked Questions
-
What is the difference between ASTM A53 GR.B and A106 GR.B?
ASTM A53 GR.B is a standard for carbon steel pipes used in both pressure and structural applications, while A106 GR.B is specifically for high-temperature service. A53 is more common for general usage and is acceptable for many applications. -
What does SCH80 mean?
Schedule 80 indicates a thicker wall compared to Schedule 40, providing higher pressure rating. For 21.3mm OD, SCH80 wall thickness is approximately 3.73mm. -
Is the black annealed finish suitable for painting?
Yes, the black annealed surface is free of scale and oil, providing excellent adhesion for paints, coatings, or lining. -
Can I get custom lengths or threaded ends?
Absolutely. We offer customizable lengths (6m, 8m, 12m, or as required) and end finishes including plain, beveled, and threaded upon request. -
Do you provide any certificates?
Yes, we provide mill test certificates (MTC) as per ASTM A53 standards, and our factory is ISO9001 certified. Additional third-party inspection is available upon request. -
What is the typical lead time?
For standard sizes, lead time is 15–20 working days. Custom orders may require 25–30 working days depending on quantity and specifications. -
How do you ensure product quality?
Every batch is tested for dimensional accuracy, chemical composition, mechanical properties, and hydrostatic pressure. We follow strict quality control procedures in line with ISO9001. -
What are the packaging options?
Pipes are bundled with steel straps, wrapped in waterproof material, and can be packed in containers or with wooden crates for added protection during transit.
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