Seamless Carbon Steel Tubes

Bright Surface. No Oxidation Scale. Superior Cleanliness.

• Oxygen-free furnace annealed
• Bright and clean surface finish
• No oxidation scale
• Smooth inner and outer surface
• Improved dimensional stability
• Excellent straightness
• Good machinability
• Suitable for heat exchanger applications
• Ideal for precision equipment

• Standards:

  • DIN 2391 / EN 10305-1 (Precision seamless steel tubes)

  • ASTM A179 / A192 (Boiler & heat exchanger)

  • ASTM A513 (Mechanical tubing)

  • Custom standards available upon request

• Grades:

  • Carbon steel: ST37.4, ST44, ST52, 10#, 20#, Q345

  • ASTM: A179, A192, 1010, 1020, 1026

• Outer Diameter (OD): 4 mm – 219 mm

• Wall Thickness (WT): 0.5 mm – 25 mm

• Delivery Condition:

  • BK (Cold drawn, hard)

  • GBK (Annealed, not bright)

  • NBK (Bright annealed, scale-free) — Recommended

• Length: Fixed lengths 3–25 meters, or custom lengths per request

• In-line eddy current testing (ET) / ultrasonic testing (UT)

• Tensile testing, flaring test, flattening test

• Microstructure analysis (metallographic inspection)

• Surface inspection: 100% visual inspection to ensure no scale, no rust, and consistent brightness

Advantages of Bright Annealed Tubes

Compared with normal annealed tubes:

• No surface oxidation
• No pickling required
• Cleaner internal surface
• Better appearance
• Improved corrosion resistance
• Ideal for clean applications

Why Choose Vulroc Seamless Carbon Steel Tubes

• Oxygen-free furnace annealing
• Bright surface quality
• No oxidation scale
• Tight dimensional tolerance
• Smooth ID surface
• Suitable for heat exchangers
• Custom sizes available
• Fast delivery

Packaging

• Bundled packing
• Plastic caps protection
• Anti-rust protection
• Wooden case packing
• Export standard packing