QIDAMT
Product Overview
Our Carbon Steel Seamless Tube (also known as seamless steel pipe) is manufactured from high-quality carbon steel billets through hot rolling or cold drawing processes. With no welded seam, seamless tubes offer superior strength, pressure resistance, and reliability for high-pressure and high-temperature applications. We supply a comprehensive range of carbon steel seamless tubes in various grades, sizes, and specifications to meet your project requirements.
Specifications
Steel Grades: ASTM A106 Gr.B, A53 Gr.B, API 5L Gr.B, 20#, 45#, Q345B, 16Mn, ST37, ST52, 1020, 1045
Standard: ASTM A106, ASTM A53, API 5L, GB/T 8163, GB/T 3087, DIN 1626, EN 10210, JIS G3454
Outer Diameter (OD): 10.2 mm – 720 mm (1/2″ – 28″)
Wall Thickness (WT): 1.5 mm – 60 mm (SCH 10 – SCH 160, XXS)
Length: 5.8m, 6m, 11.8m, 12m, or as per customer request (SRL, DRL)
Surface Treatment: Black (varnished/oiled), Galvanized, 3PE/3PP Coated, FBE Coated, Painting
End Finish: Plain End, Beveled End, Threaded End (with coupling)
Tolerance: OD: ±1%, WT: ±10%, Length: ±50mm
Process: Hot Rolled (HR), Cold Drawn (CD), Cold Rolled (CR)
Key Features & Advantages
- Superior pressure resistance – no welded seam eliminates weak points
- Excellent mechanical properties – high tensile strength and toughness
- Wide size range – from small diameter precision tubes to large diameter pipes
- Customizable specifications – grades, sizes, lengths, and coatings tailored to your needs
- Rigorous quality control – full traceability from raw material to finished product
- Cost-effective – competitive pricing with bulk order discounts
- Fast delivery – large inventory for standard sizes, custom orders in 15-30 days
- Certified quality – ISO 9001, API Q1, CE, and third-party inspection available
Applications
- Oil and gas transmission pipelines
- Petroleum refining and petrochemical plants
- Power plants – boiler tubes, superheater tubes
- Hydraulic and pneumatic systems
- Construction and structural applications
- Mechanical engineering and machinery manufacturing
- Automotive and transportation components
- Water supply and sewage systems
- Heat exchangers and condensers
- Mining and mineral processing equipment
Quality Control & Testing
Every batch of our carbon steel seamless tubes undergoes strict quality control procedures:
Raw Material Inspection: Chemical composition analysis (spectrometer), dimensional verification
Process Control: In-line monitoring of rolling temperature, wall thickness, and surface quality
Finished Product Testing: Hydrostatic pressure test, ultrasonic flaw detection (UT), eddy current testing (ET), tensile test, impact test, hardness test, flattening test, flaring test
Surface Inspection: Visual inspection for cracks, folds, scars, and other defects
Documentation: Mill Test Certificate (MTC) per EN 10204 3.1, material traceability records
Packaging & Shipping
Packaging: Standard export packaging – bundles tied with steel strips, hexagonal bundles, wooden pallets or crates, end caps for protection, waterproof wrapping
Marking: Steel grade, size, heat number, standard, manufacturer logo (painted or stenciled)
Trade Terms: FOB, CIF, CFR, EXW, DDP
Payment: T/T (30% deposit, 70% before shipment), L/C at sight, Western Union, PayPal (sample orders)
Lead Time: Standard sizes in stock – 3-7 days; Custom sizes – 15-30 days
MOQ: 1 ton for standard sizes; custom orders negotiable
Loading Port: Qingdao, Shanghai, Tianjin, or as requested
Why Choose Us
With over 15 years of experience in steel manufacturing and export, we are a trusted supplier of carbon steel seamless tubes to customers in more than 50 countries. Our factory is equipped with advanced production lines and testing equipment, ensuring consistent quality and on-time delivery. We offer one-stop service from material selection to after-sales support, and our experienced engineering team can provide technical consultation and customized solutions for your specific applications. Contact us today for a competitive quote!
