Seamless Steel Pipe Production
Precision seamless steel pipe manufacturing using hot-rolling and cold-drawing processes for oil & gas, boilers, petrochemical, and mechanical engineering applications.
API 5L | ASTM A106 | ASTM A335 | EN 10216 | GB/T 8163 | GB 5310
What is Seamless Pipe?
Seamless steel pipe is manufactured by piercing a solid steel billet to form a hollow tube, without any welding seam. This process creates a pipe with uniform wall thickness, superior strength, and excellent pressure-bearing capacity compared to welded pipes.
CREATEEL supplies seamless pipes from leading Chinese mills using advanced rotary piercing, Assel rolling, and cold-drawing technology. Available in carbon steel, alloy steel, and stainless steel grades for the most demanding applications worldwide.
Manufacturing Process
From solid steel billet to precision seamless tube — each stage ensures metallurgical integrity and dimensional accuracy.
Steel Billet
Round carbon/alloy steel billets inspected for chemistry, surface quality.
Heating
Billets heated to 1200-1280°C in rotary hearth furnace for uniform temp.
Piercing
Mannesmann piercer creates hollow shell from solid billet.
Rolling
Plug mill or Assel mill elongates and reduces wall to target size.
Reeling
Reeling mill improves roundness and surface finish.
Sizing
Sizing mill achieves precise OD and wall thickness tolerances.
Cooling
Controlled cooling on walking beam to prevent residual stress.
Straightening
Rotary straightener corrects curvature to meet straightness specs.
Testing
Hydrostatic, UT, ET, and UT thickness testing per API 5L/ASTM.
Finishing
End facing, beveling, heat treatment, and protective packaging.
Our Seamless Pipe Products
Comprehensive range of seamless pipes and tubes for high-pressure, high-temperature, and corrosive environments.
Seamless Carbon Pipe
1/8″ to 36″ OD, WT 1.0-40mm. ASTM A106 Gr.B/C, API 5L Gr.B-X70.
OCTG Casing & Tubing
4-1/2″ to 20″ casing, 1.05″ to 4-1/2″ tubing. API 5CT.
Boiler Tube
1/2″ to 16″ OD. ASTM A213 T11/T22/T91, GB 5310 20G/12Cr1MoVG.
Alloy Steel Pipe
ASTM A335 P5/P9/P11/P22/P91. Chrome-moly for high-temp service.
Line Pipe
API 5L PSL1/PSL2, X42 to X80. Onshore & offshore pipelines.
Seamless Casing
H40 to Q125 grades. Premium thread connections available.
Technical Specifications
Carbon Steel (ASTM A106)
Grade A/B/C for high-temp service
OD: 1/8″ to 36″ | WT: SCH10 to SCH160
Max working temp: 425°C (Gr.A/B), 540°C (Gr.C)
Line Pipe (API 5L)
PSL1 & PSL2 | X42 to X80 grades
OD: 1/2″ to 36″ | WT: 1.73mm to 40mm
Seamless and welded available
OCTG (API 5CT)
Casing: 4-1/2″ to 20″ | H40 to Q125
Tubing: 1.05″ to 4-1/2″ | J55/K55/N80/L80/P110
Drill pipe available on request
Boiler & Heat Exchanger
ASTM A213 T11/T22/T91/TP304/TP316
GB 5310 20G, 12Cr1MoVG, 12Cr2MoWVTiB
UT, ET, hydrostatic testing
Alloy Steel (ASTM A335)
P1/P5/P9/P11/P12/P22/P91 grades
Chrome-moly for power plant piping
Normalized & tempered condition
Inspection & Certificates
Hydrostatic test per API 5L / ASTM
UT weld & laminar inspection
MTC EN 10204 3.1/3.2, SGS/BV/TUV
500,000+
Tons Annual Capacity
1/8″ – 36″
Diameter Range
60+
Countries Served
20+
Years of Experience
Application Scenarios
Oil & Gas Transportation
API 5L X42-X80 seamless line pipes for oil and gas transmission, gathering systems, and distribution networks. Suitable for sour service (H2S environment) and high-pressure applications up to 200 bar.
Power Generation
ASTM A335 P11/P22/P91 alloy steel pipes for main steam, reheat, and high-temperature piping in thermal power plants. Operating temperatures up to 620°C with creep resistance guaranteed.
Mechanical & Structural
Precision seamless tubes for hydraulic cylinders, automotive components, pressure vessels, and general engineering. DOM (drawn over mandrel) tubes available with tight ID tolerance.
Ready to Source Seamless Steel Pipes?
Contact our team for competitive pricing, mill test certificates, and reliable worldwide delivery.
Email: sales@createel.com | WhatsApp: +86 15602135951