British Standard

BS 4449:1988 Carbon Steel Bars for the Reinforcement of Concrete

BS 4449:2005 Steel for the Reinforcement of Concrete

Tensile Properties

The absolute maximum permissible value of yield strength is 650MPa
For yield strength (Re), the upper yield (ReH) shall apply. Determine (Re) from the 0.2% proof strength (Rp0.2) if a yield phenomenon is not present.

Chemical Composition (Maximum% by Mass)

Ceq = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15