I-Beam Bending (NPI/NPV)

What Is NPI-NPV I-Beam Bending?

NPI-NPV bending is a metal forming process in which I-section steel profiles (NPI: narrow flange, NPV: parallel flange) are shaped into circular, semi-circular, or custom curved forms using hydraulic profile bending machines. Since these profiles serve as structural load-bearing elements, the bending process requires high precision and engineering expertise. At Ankay Büküm's Ankara Ostim facility, we bend a range of I-profiles from NPI 80 to NPI 300 and IPE 80 to IPE 400.

Application Areas

• Tunnels and Underground Structures: Tunnel support arches, metro station steel linings, and underground gallery reinforcements
• Steel Structures and Hangars: Main load-bearing elements of arched steel roofs, sports hall and exhibition venue dome structures
• Bridges: Curved girders for bridges, pedestrian overpasses, and viaduct elements
• Industrial Facilities: Circular platforms, rotary kiln supports, and large-diameter industrial frame structures
• Architectural Projects: Curved steel frames in modern architectural designs, glass roof supports, and decorative structural elements

Technical Capacity and Specifications

Our facility bends narrow-flange profiles from NPI 80 to NPI 300 and wide-flange profiles from IPE/HEA/HEB 80 to 400. Bending can be performed about the easy axis (perpendicular to profile axis) or the hard axis (parallel to profile axis). Minimum bending radius depends on profile size and is typically set at 6-8 times the profile height. Cold bending is preferred, with heat-assisted bending applied when necessary.

Quality Assurance

Since NPI-NPV bending involves structural steel elements, EN 1090-2 compliance is of paramount importance. After bending, every piece undergoes geometric inspection, deformation analysis, and ultrasonic testing when required. Deliveries are accompanied by EN 10204 3.1 certificates for material traceability.

Ankay Büküm stands out in structural steel profile bending with its modern Ankara Ostim facility and experienced team. For NPI and NPV profile bending needs ranging from tunnel projects to steel roofs, bridge girders to architectural designs, reach out to our technical team. With over 30 years of industry experience, we are ready to add value to your project.