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ONTON Technology Co.,Ltd
ONTON Technology Co.,Ltd  

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Bend / Rebend Test Result of Hollow Threaded Bar (SDA, IBO)
Bend / Rebend Test Result of Hollow Threaded Bar (SDA, IBO)
The ductility of hollow bars can be checked easily on site by a bend / rebend test:

Bending around 180° (U-shape) over a pin diameter D ≥ 6 x diameter of hollow bar e.g. for ONTON R32N D = 6 x 32 mm = 192 mm.

If there are visible cracks or the hollow bar breaks, there is not enough ductility as required in detail in ASTM A 615. "Specification for Low-Alloy Steel Deformed and Plain Bars for Concrete Reinforcement".

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