Cold Drawn Seamless Tubing Cold Finished Seamless Steel Tube For Mechanical Engineering

Summary:
BS6323-4 cold drawn seamless tubing is a precision-engineered carbon steel tube designed for demanding mechanical and general engineering applications. Manufactured via a seamless drawing process and cold finished to tight dimensional tolerances, these tubes provide excellent strength-to-weight ratios, superior surface finish, and consistent mechanical properties. They comply with BS 6323-4 delivery conditions (BK, BKW, GBK, NBK, GZP, NZP) and are often specified alongside comparable grades from ASTM, EN, JIS, GB, and GOST standards.

1. Material

BS6323-4 tubes are fabricated from low-carbon hot-rolled strip steel and cold drawn to achieve a refined grain structure, resulting in enhanced mechanical properties and surface finish. The typical base material is mild carbon steel, suitable for subsequent machining, welding, or forming operations.

2. Specifications

• Outside Diameter (O.D.): 6 mm to 280 mm

• Wall Thickness (W.T.): 1 mm to 30 mm

• Lengths: Random lengths of 4 m–7 m or cut-to-length per customer requirements

• Delivery Conditions:

  • BK (Cold finished/hard)

  • BKW (Cold finished/soft)

  • GBK (Annealed)

  • NBK (Normalized)

  • GZP, NZP (Bright annealed, normalized & de-scaled)

3. Chemical Composition

4. Mechanical Properties

5. Main Features

• Precision Finish: Tight tolerances on diameter (±1 %) and wall thickness (±10 %) ensure minimal post-machining

• Enhanced Strength: Cold drawing refines microstructure, boosting tensile and yield strengths over hot-finished equivalents

• Surface Quality: Smooth, scale-free surface reduces friction and wear in dynamic applications

• Consistent Performance: Uniform properties along tube length support high-precision assemblies

6. Standards

• British Standard: BS 6323-4:1982 (Cold finished seamless steel tubes)

• European: EN 10305-1 (Cold drawn tubes for hydraulic and pneumatic applications)

• American: ASTM A519 (Seamless carbon and alloy steel mechanical tubing)

• Japanese: JIS G3445 (Cold drawn carbon steel tubes for mechanical applications)

• Chinese: GB/T 3639 (Precision steel tubes — cold drawn or cold rolled)

7. Applications

7.1 General Application Areas

• Automotive components

• Hydraulic and pneumatic cylinders

• Mechanical engineering assemblies

• Precision machining parts

• Structural frameworks

7.2 Specific Uses

• Automotive: Drive shafts, axle components, steering linkages

• Hydraulics: Cylinder barrels, piston rods, valve bodies

• Machinery: Gear shafts, spindles, couplings

• General Engineering: Fixtures, jigs, frame supports

• Precision Devices: Instrument housings, hydraulic fittings

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,

it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact with me.