Carbon steel:

Steel containing carbon up to about 1.2%, and only residual amounts of other elements except for those added for composition control, with silicon usually limited to 0.60 % and manganese to 1.65%

CPF is Czech forge producing open-die (free) forgings, closed-die (drop) forgings, steel forgings, aluminium forgings, copper forgings, brass forgings, titanium forgings, nimomic forgings like p.e. forged turbine blades, forged compressor blades, forged connecting rods, forged gear wheels, forged crankshafts, forged valves, forged rings, forged shafts, forged propeller blades and other types of hot forgings. CPF is certified by ISO 9001:2015, Det Norske Veritas (DNV), American Bureau of Shipping (ABS), Bureau Veritas (BV), Lloyd's Register of Shipping (LR), Germanischer Lloyd (GL), RINA, TÜV NORD, Korean Register of Shipping (KR), Česká dráhy (ČD), Deutsche Bahn (DB).