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Black Carbon Erw Round Steel Pipe - Durable & Reliable | China Suppliers & Factory Equipment

Black steel pipe, often referred to as carbon or mild steel pipe, is produced from low-carbon steel, resulting in a distinct dark surface due to the black oxide scale created during manufacturing. Although it doesn't have a protective coating, making it more prone to corrosion, it is ideal for dry environments or circumstances where additional surface protection can be applied. Renowned for its exceptional mechanical strength and durability, black steel pipes are extensively utilized across residential, commercial, and industrial sectors. Sourced from reliable suppliers and factories in China, these pipes are available in a wide variety of sizes and wall thicknesses, making them adaptable to various installation requirements. Whether you need black steel pipe for plumbing, structural applications, or other uses, you can trust the quality and performance that comes from established China suppliers

Product Details

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.

🔧 (1) Welded Black Steel Pipe

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.

⚙️ (2) Seamless Black Steel Pipe

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.

Oil & Gas Transportation: Seamless black steel pipes are ideal for high-pressure applications, where structural integrity and safety are critical. Their continuous grain structure ensures reliable performance under demanding conditions.
Water Supply & Gas Lines: Welded black steel pipes are commonly employed in low-to-medium pressure systems, including water supply and gas distribution networks.
Fire Sprinkler Systems: Their fire-resistant characteristics make welded black steel pipes a dependable choice for safety-related installations such as fire sprinkler networks.
Construction & Structural Use: Widely used in building frameworks, scaffolding, and structural support across commercial and industrial construction projects.

Quality Control and Delivery Standards

We implement strict quality assurance measures throughout the production process:

Experienced QC Team: Random inspections are conducted by experienced QC personnel with over five years of industry expertise.
CNAS-Accredited Facilities: Our testing facilities are CNAS-accredited, ensuring compliance with national and international standards.
Third-Party Inspection: Inspections by globally recognized agencies such as SGS or BV are welcome and can be arranged upon request.

Packaging and Shipping Information

📦 Packaging Details

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.

🕒 Delivery Time

Typically 20 to 30 days, depending on order quantity.

🚢 Port of Loading

Tianjin Port, China

Frequently Asked Questions (FAQ)

Q What is black steel pipe and why is it called "black"?

Black steel pipe gets its name from the dark black oxide coating that forms naturally on its surface during the manufacturing process. Unlike galvanized steel pipe, it is not coated with zinc, giving it a characteristic dark appearance. This finish provides a basic level of surface protection and is suitable for many dry or indoor applications.

Q What is the difference between welded (ERW) and seamless black steel pipe?

Welded (ERW) black steel pipes are formed by rolling steel strips and welding the seam using electric resistance, making them cost-effective for low-to-medium pressure applications. Seamless pipes are produced without any welding through hot or cold rolling, resulting in a uniform structure with no seam — ideal for high-pressure, high-temperature, or critical applications such as oil and gas pipelines.

Q Which international standards do your black steel pipes comply with?

Our black steel pipes comply with multiple international and national standards, including GB/T3091, GB/T13793, API 5L, ASTM A53, ASTM A500, ASTM A36, and ASTM A795. We can supply pipes to meet specific project requirements upon request.

Q Can I request third-party inspection before shipment?

Yes, absolutely. We welcome third-party inspections by globally recognized agencies such as SGS or Bureau Veritas (BV). These can be arranged prior to shipment to ensure the products meet your required specifications and quality standards.

Q What are the available pipe end types and wall thickness options?

We offer three pipe end types: Plain End, Beveled End, and Grooved End, to suit different connection and installation requirements. Wall thickness options follow ASTM A53 / A500 schedules ranging from Sch10 to Sch80, covering a wide range of pressure and structural needs.

Q How are the pipes packaged and what is the typical lead time?

Pipes are bundled in hexagonal packs secured with steel strips and fitted with two nylon slings for safe handling during sea freight. The standard delivery lead time is 20 to 30 days depending on order quantity, with shipment from Tianjin Port, China.