China Black Carbon Erw Round Steel Pipe - Durable Supplier and Factory for Industrial Applications
Product Video
Product Overview
| Product Name | Black Steel Pipe |
| Material | Low Carbon Steel |
| Available Grades | Q195 (S195 / A53 Grade A) |
| Q235 (S235 / A53 Grade B / A500 Grade A) | |
| Q355 (S355JR / A500 Grade B / Grade C) | |
| Applicable Standards | GB/T3091, GB/T13793, API 5L, ASTM A53, A500, A36, ASTM A795 |
| Wall Thickness Range | ASTM A53 / A500 Sch10 – Sch80 |
| Surface Finish | Black oxide finish (natural or painted) |
| Pipe Ends | Plain, Beveled, or Grooved |
Types of Black Steel Pipe by Manufacturing Process
Black steel pipes can be categorized based on their production method into two main types: welded and seamless.
Welded pipes are produced by forming and welding steel plates or strips into a tubular shape, typically using the Electric Resistance Welding (ERW) method. This process allows for efficient production of long pipe sections at a relatively low cost while maintaining good mechanical performance and toughness.
Seamless pipes are manufactured through hot or cold rolling without any welding, resulting in a uniform structure throughout. The absence of seams eliminates weak points, offering superior strength and reliability, especially in high-pressure or extreme operating environments.
Common Applications of Black Steel Pipe
Black steel pipes are versatile and used across a wide range of industries, including construction, plumbing, and energy.
Ideal for high-pressure applications such as oil and gas transportation, where structural integrity and safety are critical. Their continuous grain structure ensures reliable performance under demanding conditions.
Commonly employed in low-to-medium pressure systems, including water supply, gas lines, and fire sprinkler networks. Their fire-resistant characteristics make them a dependable choice for safety-related installations.
Quality Control and Delivery Standards
We implement strict quality assurance measures throughout the production process:
- Random inspections are conducted by experienced QC personnel with over five years of industry expertise.
- Our testing facilities are CNAS-accredited, ensuring compliance with national and international standards.
- Third-party inspections by globally recognized agencies such as SGS or BV are welcome and can be arranged upon request.
Packaging and Shipping Information
Frequently Asked Questions (FAQ)
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Q What is black steel pipe and why is it called "black"?Black steel pipe gets its name from the dark iron oxide coating formed on its surface during the manufacturing process. Unlike galvanized pipe, it is not coated with zinc, giving it a natural black or dark gray appearance. This finish is either left as-is or painted for additional protection.
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Q What is the difference between welded and seamless black steel pipe?Welded black steel pipe (ERW) is made by forming steel strips into a tube and welding the seam, making it cost-effective for low-to-medium pressure applications. Seamless pipe is produced without welding through hot or cold rolling, providing a uniform structure with no seam — ideal for high-pressure and critical applications such as oil and gas transport.
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Q Which international standards does your black steel pipe comply with?Our black steel pipes comply with multiple international standards including GB/T3091, GB/T13793, API 5L, ASTM A53, ASTM A500, ASTM A36, and ASTM A795, ensuring suitability for projects across different regions and regulatory requirements.
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Q Can third-party inspections be arranged before shipment?Yes. We welcome third-party inspections by internationally recognized agencies such as SGS or Bureau Veritas (BV). These can be arranged upon request to ensure full transparency and product quality assurance before shipment.
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Q What are the available pipe end types and how are the pipes packaged for export?Black steel pipes are available with plain, beveled, or grooved ends to suit various connection methods. For export, pipes are bundled in hexagonal bundles secured with steel strips, with two nylon slings per bundle for safe and efficient loading and handling during sea transport.
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Q What is the typical lead time and which port is used for shipment?The standard delivery time is 20 to 30 days, depending on the order quantity and specifications. All shipments are dispatched from Tianjin Port, China, one of the major international shipping hubs in northern China.