This document specifies technical requirements for ribbed bars to be used as reinforcement in concrete.

This specification covers steel of type:

- S-400

- S-400W

Note:

The first letter "S" in the designation of steel stands for the word "Steel" in terminology "steel for the reinforcement of concrete". The next three digits represent the minimum characteristic value of the upper yield strength, . The letter "W" stands for weldable steel.

This specification covers products delivered as straight bars, whether manufactured as straight bars or straightened from coils. This specification applies to the coil, the straight bar, and the straight bar that has been straightened from a coil.

The production process is subject to the manufacturer's discretion as long as it meets all the requirements as detailed in this standard specification.

It does not apply to ribbed bars produced from finished products, such as plates and parts of railways.