Top Carbon Steel Seamless Pipe Manufacturer & Supplier

Leading Carbon Steel Seamless Pipe Manufacturer

Looking for high-performance carbon steel seamless pipes? As an industry-leading manufacturer, we specialize in producing pipes with exceptional strength, uniform structure, and flawless finish—perfect for applications in oil & gas, construction, and heavy industry. Our carbon steel seamless pipes are crafted from premium raw materials, ensuring excellent pressure resistance, corrosion protection, and long service life. With flexible customization, competitive prices, and reliable global delivery, we help your projects run stronger, safer, and more efficiently.

Trusted Supplier of Seamless Carbon Steel Pipe

Founded in 2002, Dexin Steel Tube (China) Co., Ltd, under the brand name Dexin, has grown into a leading manufacturer and supplier of seamless carbon steel pipes in China and worldwide. With nearly two decades of expertise, Dexin has earned recognition for its high-quality products, strong inventory, and reliable global distribution network.

Dexin offers a complete range of seamless carbon steel pipes for industries including oil & gas, construction, power generation, automotive, and petrochemicals. Our products are manufactured to international standards, ensuring exceptional durability, performance, and safety in high-pressure and critical applications.

Our portfolio includes:

Seamless carbon steel pipe in a variety of sizes, schedules, and grades
Boiler and heat exchanger tubes
Line pipe for oil, gas, and water transportation
Custom processing services such as cutting, beveling, and threading

With advanced production facilities and a commitment to excellence, Dexin continues to deliver value-added solutions tailored to customer needs.

Contact our sales engineers today to request a competitive quotation or learn more about our seamless carbon steel pipe solutions. Trust Dexin as your reliable partner for quality, consistency, and long-term success.

Dexin – Your reliable source for seamless carbon steel pipe.

What is a Seamless Carbon Steel Pipe?

Seamless carbon steel pipe is a hollow steel product without welded seams, manufactured by hot rolling or cold drawing. It complies with major standards including ASTM A53, ASTM A106, API 5L, GB/T 8163 and EN 10216-2, and is widely used in oil and gas transportation, power engineering, petrochemical, boiler and high-pressure mechanical systems.

Seamless Carbon Steel Pipe Wall Thickness and Dimensions

Dexin can supply seamless carbon steel pipes in almost all industrial size combinations, from small precision tubes (8 mm OD) to large heavy-wall pipes (up to 1,422 mm OD and 150 mm thickness).

Thin wall / precision tubes

Medium wall structural pipes

Heavy wall pressure pipes

Custom sizes based on drawings

With 3 mature manufacturing processes (hot-rolled, cold-drawn, cold-rolled) and compliance with global standards, we ensure reliable delivery for projects that demand strength, accuracy, and durability.

Applications of Large-Diameter Carbon Steel Seamless Pipes

Large-diameter carbon steel seamless pipes (OD 273 mm and above) are the backbone of modern industrial infrastructure — chosen for their exceptional strength-to-cost ratio, reliable weldability and proven performance in high-pressure, high-temperature service across the world's most demanding sectors.

Energy

Oil & Gas Gathering & Transmission

Carbon steel seamless pipe dominates onshore oil and gas infrastructure because it combines the wall thickness needed for high operating pressures with the metallurgical consistency required for reliable girth-weld joints over hundreds of kilometres. API 5L-grade pipe in PSL2 specification is the de-facto material for gathering networks and trunk lines where cost efficiency and field-weldability are equally critical.

PSL2 chemistry controls ensure consistent HAZ properties across long-seam welds

HIC / SSC-resistant grades for sour gas and CO₂-rich production streams

Full-body UT and hydrostatic testing standard; mill TPI accepted

OD 273–914 mm WT 9.5–50 mm API 5L Gr.B / X52 / X65 / X70 PSL2 SMLS

Energy

Boiler & Power Station Piping

Chrome-moly alloy steel seamless pipes are the specified material for main steam headers, hot reheat lines and steam drum connections in coal-fired and gas-fired power plants. The addition of chromium and molybdenum gives these grades the creep rupture strength necessary to sustain decades of cyclic thermal loading at temperatures where plain carbon steel would rapidly degrade.

P11 / P22 for subcritical duty; P91 / P92 for supercritical and USC cycles

Normalized-and-tempered delivery condition; hardness-banded per ASME B31.1

Positive material identification (PMI) and charpy impact reports supplied as standard

OD 299–762 mm WT 16–80 mm ASTM A335 P11 / P22 / P91 / P92 GB/T 5310 certified

Chemical

Refinery Process Piping & Pressure Vessels

Inside petroleum refineries, seamless carbon and low-alloy steel pipes form the high-pressure interconnections between crude distillation units, hydrotreaters, catalytic crackers and coker drums. Seamless construction eliminates the weld seam — a known weak point under high-temperature hydrogen partial pressure — making these pipes the preferred choice wherever HTHA (high-temperature hydrogen attack) risk must be managed per API RP 941 Nelson curves.

Material selection governed by API RP 941 Nelson curves for HTHA resistance

1¼Cr-½Mo and 2¼Cr-1Mo for hydrotreater and hydrocracker service

PWHT-capable wall thicknesses; NACE MR0103 compliance available

OD 219–630 mm WT 8–60 mm ASTM A106 Gr.C · A335 P5 / P9 / P11 / P22 Hot-rolled

Mining

Mining Slurry Pipelines

Overland concentrate pipelines transporting iron ore, copper, coal or phosphate slurry over distances of tens to hundreds of kilometres represent one of the most mechanically punishing duties for any pipe material. Heavy-wall carbon steel seamless pipe is selected here not for corrosion performance but for its combination of high tensile strength, toughness under pressure surge and cost-effective repairability — replacement sections can be cut and butt-welded in the field without specialist equipment.

Extra-heavy wall (WT/OD > 0.1) absorbs pressure surges from pump trips and valve closures

Field-weldable with standard E7018 / E8018 consumables; no preheat above 200 °C

Cement mortar or rubber-lining options extend service life in highly abrasive applications

OD 325–914 mm WT 14–80 mm ASTM A106 Gr.B/C · API 5L X52 Hot-rolled + normalized

Construction

Structural Piling & Foundation Engineering

Open-ended steel pipe piles are driven or pressed into ground to support bridges, port quay walls, wind turbine foundations and high-rise building bases. The seamless construction provides uniform wall thickness around the full circumference — a critical advantage when piles are subjected to eccentric loading, lateral soil pressure and the repeated impact forces of pile-driving. Carbon steel's high modulus of elasticity makes pipe piles stiffer per unit weight than almost any alternative foundation element.

Uniform wall thickness withstands asymmetric driving forces without local buckling

High axial and lateral load capacity for bridges, port quays and turbine monopoles

EN 10219 / ASTM A252 / GB/T 8162 structural grades; lengths to 18 m standard

OD 406–1,219 mm WT 12–60 mm S355J2H · Q345B · ASTM A252 Gr.3 Hot-finished

All pipes can be supplied to GB, ASTM/ASME, DIN/EN, BS, JIS and GOST standards. Custom OD, wall thickness, length, end treatment and third-party inspection available on request.