The manufacturing process involves cold drawing or cold rolling operations conducted entirely at room temperature, followed by basic finishing steps including straightening, end cutting, and surface cleaning. This simplified production workflow eliminates heat treatment stages, resulting in shorter lead times and reduced manufacturing costs while preserving the benefits of cold working.

These BK condition pipes exhibit exceptional mechanical strength and hardness due to work hardening during cold processing. The enhanced strength properties significantly surpass those of annealed (GBK) and normalized (NBK) tubes, though with reduced plasticity and toughness typically showing elongation rates between 10%-15% depending on material grade. The precise dimensional control achieved through cold working ensures tight outer diameter and wall thickness tolerances with excellent surface finish and low roughness values.

The superior surface quality of Cold Finished Steel Pipes presents clean, smooth surfaces free from oxide scale, requiring no additional polishing or surface treatment. However, the presence of residual internal stresses from cold working necessitates careful consideration for applications involving bending, welding, or complex forming operations, where preliminary annealing may be required to prevent cracking or deformation.

Technical Characteristics:

  • High strength and hardness through work hardening

  • Tight dimensional tolerances with excellent surface finish

  • Simplified manufacturing process without heat treatment

  • Immediate availability for assembly and basic machining

  • Cost-effective production with shorter lead times

  • Suitable for applications without complex secondary forming

Cold Finished Steel Pipes serve effectively in mechanical manufacturing for precision shafts, fasteners, and structural components where high stiffness and dimensional accuracy are paramount. These hard-condition tubes are widely used in hydraulic and pneumatic systems for short-stroke cylinders and pipe connectors requiring high strength without bending operations. The precision instrument industry utilizes these pipes for housings and drive shafts benefiting from their high precision and rigidity, while general engineering applications favor them for direct assembly situations where complex forming is unnecessary.

Supported by Tenjan's 21 years of seamless tube expertise and 30 years of technical experience in our R&D team, we provide customized cold finished solutions tailored to your specific application requirements. Our advanced manufacturing capabilities ensure each Cold Finished Steel Pipe (BK/+C) meets exact specifications for materials, dimensions, surface quality, and mechanical properties, delivering reliable performance for your engineering applications where high strength and precision are essential.