Silver steel is common tool steel in the UK that is supplied as a centerless ground round bar. It is roughly equivalent to drill rod in the US.
The steel is defined under specification BS-1407, with the closest European equivalent being 1.2210 (although this steel contains vanadium). The composition is as follows: carbon 0.95?1.25, manganese 0.25?0.45, chromium 0.35?0.45, silicon 0.40 max, phosphorus 0.045 max, sulfur 0.045 max.
In the annealed state is has a hardness of 27 RHC. It can be hardened to 64 RHC.