China Black Carbon Erw Round Steel Pipe Suppliers - Factory Direct for Durable and Versatile 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
Pipes are packed in hexagonal bundles suitable for sea transport, secured with steel strips. Each bundle is equipped with two nylon slings for easy handling and loading.
Typically 20 to 30 days, depending on order quantity.
Tianjin Port, China