Standards for Prestressing steel
The standards for prestressing steel are:
BS 5896 ´Specification for high tensile steel wire and strand for the prestressing of concrete´ gives the requirements for steel wire and 7-wire strand.
BS 4486 ´Specification for hot rolled and hot rolled and processes high tensile alloy steel bars for the prestressing of concrete´ gives th requirements for preferred sizes of bars, with two nominal strength levels (835 and 1080 N/mm2).
Test methods to determine the properties of steel sheaths for tendons are covered by BS EN 524 ´Steel strip sheaths for prestressing tendons: test methods´.
Note that these Standards are in the process of being replaced by BS EN ISO 15630, ´Steel for the reinforcement and prestressing of concrete´.