No surface treatment
This means it needs no surface treatment and can withstand corrosion attack by the elements much better than conventional structural steels.
In addition to its weather-resistance, the high strength of the steel can be utilised by machinery and equipment builders to lighten the tare weight of mobile machines and thus increase their payloads. This in turn reduces overall fuel consumption.
"These steels are ideal for use in various rolling stock applications, as well as in the lattice structures of power line pylons and in agricultural trailers, for example," says Thomas Hörnfeldt, Senior Vice President at Ruukki.
Ruukki Optim 550 W steel grade is used, among other things, in the body structures of the new trams currently being made by Transtech for use in Helsinki, Finland. The use of high-strength steels helps to lighten tram weight because the steel used can be thinner and still retain the properties required. A lighter tram structure means less energy is required to operate it.