UNIASEN | Leading Carbon Steel Pipe Supplier in China

UNIASEN – Your Trusted Carbon Steel Pipe Manufacturer

Unisen (Tianjin) Co., Ltd. is a leading carbon steel pipe manufacturer, supplier, and exporter in China, dedicated to providing high-quality steel pipes and related products to customers around the world.

Our product line covers a variety of pipe types, including ERW pipes, SMLS pipes, line pipes, sprinkler pipe, shoulder pipes, OTCG, and pipe fittings, which are widely used in many industries such as petroleum, chemical, construction, water conservancy, and coal.

With modern production facilities and advanced automated steel pipe welding lines, our annual production capacity can reach 20,000 tons, enabling us to meet the diverse needs of our customers. Our team has over 20 experienced industry experts who will advise you and provide solutions to help you finish your projects more efficiently.

Learn More About Us

27

Years Experience

279

Project Done

235

Employees

1292

Happy Clients

Our Products

UNIASEN specializes in providing carbon steel pipes suitable for a diverse range of global projects. We can provide carbon steel pipe products in all standards and grades. We have more than 20,000 tons of steel pipes in stock.

ERW Steel Pipe

Electric Resistance Welded pipes manufactured to API 5L, ASTM A53, AS 1163, and other international standards.

• Standards: API 5L, ASTM A53, AS 1163

• Applications: Oil & Gas, Construction, Water Supply

• Stock Available: Yes

Galvanized Pipe

High-quality galvanized carbon steel pipes ideal for corrosion resistance in outdoor and humid environments.

• Standards: ASTM A53, BS 1387

• Applications: Fire Protection, Structural, Plumbing

• Coating: Hot-Dip Galvanized

LSAW Steel Pipe

Longitudinal Submerged Arc Welded pipes for high-pressure applications in oil, gas, and water transmission.

• Standards: API 5L, ASTM A252, AWWA C200

• Diameter Range: 16” – 60”

• Ideal for: Pipeline Projects

SSAW Steel Pipe

Spiral Submerged Arc Welded pipes for large-diameter pipeline systems with excellent weld integrity.

• Standards: API 5L, ASTM A252

• Applications: Water Transmission, Offshore

• Diameter: Up to 100 inches

CS Pipe Fittings

Carbon steel fittings including elbows, tees, reducers, and caps for seamless pipeline integration.

• Standards: ASME B16.1, ASTM A234

• Types: Buttweld, Socket Weld, Threaded

• Grades: WPB, WPC

Fire Sprinkler Pipe

UL Listed fire protection pipes designed for reliability and fast response in emergency systems.

• Standards: ASTM A795, UL/FM Approved

• Coating: Black or Galvanized

• Applications: Commercial Buildings, Factories

Steel Pipe Pile

Heavy-duty structural steel pipes used in foundation construction and marine engineering.

• Standards: ASTM A252, API 5L

• Applications: Bridges, Ports, Offshore Platforms

• Sizes: Customizable

Boiler Tubes

High-temperature resistant carbon steel tubes for power plants, refineries, and industrial boilers.

• Standards: ASTM A178, A192, A210

• Applications: Steam Generators, Heat Exchangers

• Precision: Seamless Construction

Hollow Section

Square, rectangular, and round hollow sections for structural and architectural applications.

• Standards: ASTM A500, EN 10219

• Applications: Construction, Scaffolding, Furniture

• Finish: Galvanized or Painted

Coated Pipe

Anti-corrosion coated pipes with FBE, 3LPE, or bitumen coatings for extended service life.

• Coatings: FBE, 3LPE, Coal Tar

• Standards: API 5L, ISO 21809

• Applications: Underground, Subsea

View All Products

Why Our Carbon Steel Pipes Are Popular Worldwide

Superior Quality

Manufactured in strict compliance with over 50 international standards including API 5L, ASTM A53, and EN10219.

On-Time Delivery

Over 20,000 tons of pipe products in stock. Delivery to port within 7 days for in-stock items.

Diversified Product Lines

We offer carbon steel pipes for different purposes including oil & gas, fire protection, construction, and water transmission.

Rich Experience

Serving oil and gas companies for over 20 years with in-depth cooperation with more than 1,000 well-known companies globally.

Our Projects

UNIASEN has rich experience in carbon steel pipe manufacturing. Its products are widely used in many industries worldwide, such as oil and gas, solar, water transmission, and construction.

MOGE Pipeline Project

Auckland Port Expansion

PDVSA Pipeline Project

Navojoa Solar Project

See More Successful Projects

Frequently Asked Questions

What standards do your steel pipes comply with?

Our carbon steel pipes comply with over 50 international standards including API 5L, API 5CT, ASTM A53, ASTM A106, AS 1074, EN 10255, and many others.

Do you offer custom pipe manufacturing?

Yes, we provide tailor-made carbon steel pipes based on customer specifications. Manufacturing lead time is usually within 30 days.

What is your production capacity?

Our annual production capacity reaches 20,000 tons, supported by modern production facilities and automated welding lines.

How fast can you deliver?

We have over 20,000 tons of pipe products in stock and can deliver to the port of shipment within 7 days.

Contact Us

UNIASEN has been a China Carbon Steel Pipe supplier, manufacturer, and exporter since 1998. We offer various oil, gas, and fire protection solutions. Our steel pipe experts are available online!

Get in Touch

Email: export@uniasen.com

Phone: +86 (22) 8381 2008

Address: No. 50 Youyi Rd., Hexi District, Tianjin, China

Hours: Mon to Fri: 10am – 6pm | Sat-Sun: 10am – 5pm

Visit Official Website to Contact