The protective atmosphere annealing technology ensures these precision annealed pipes maintain excellent surface quality while achieving uniform microstructure refinement. This sophisticated heat treatment process effectively eliminates internal stresses from cold working operations, significantly enhancing material ductility and toughness while maintaining adequate tensile strength. The resulting fully annealed condition provides superior plastic deformation capability, with elongation values typically exceeding 20% - substantially higher than hard-condition BK tubes.

These GBK pipes demonstrate exceptional dimensional stability with straightness typically within 1.5mm/m, outperforming non-annealed cold-worked tubes. The balanced mechanical properties, including approximately 315MPa tensile strength for St35 material grades, ensure reliable performance while maintaining excellent processability for subsequent manufacturing operations including bending, flaring, welding, and machining.

The primary advantage of our annealed seamless tubes lies in their exceptional processing adaptability and manufacturing flexibility. The significantly improved material plasticity enables seamless integration into various fabrication processes, making these tubes ideal for applications requiring complex forming operations or secondary processing. These properties make stress-relieved steel pipes particularly suitable for hydraulic systems, pneumatic equipment, automotive components, and agricultural machinery applications.

Technical Advantages:

  • Complete stress relief eliminating cold-working internal stresses

  • Enhanced ductility and toughness with elongation over 20%

  • Maintained tensile strength with balanced mechanical properties

  • Superior dimensional stability and straightness control

  • Excellent surface preservation through protective atmosphere annealing

  • Optimized processability for complex forming operations

Compared to alternative heat treatment conditions, our GBK annealed tubes provide superior plastic deformation characteristics versus BKS stress-relieved tubes and significantly better formability than normalized NBK condition tubes. When compared to non-heat-treated BK condition pipes, the GBK state offers dramatically improved plasticity while maintaining sufficient strength for most structural applications.

Backed by Tenjan's advanced fully automated heat treatment equipment with precise temperature control within ±2°C, we provide customized annealing solutions tailored to your specific application requirements. Our technical team ensures each precision annealed tube meets exact mechanical property specifications while maintaining consistent quality across all production batches, supporting your manufacturing needs with reliable material performance and technical expertise.