This steel family is the most common on the market and includes all the main support elements such as frames, general installations, superstructures and all the elements needed to produce a device, a mechanism, etc.

Non-alloy structural steels are tough steels with a limited carbon content in which some quantities of manganese and silicon are added in order to reach a compromise between weldability and a good Rp/R ratio (high yield limit), thereby enabling a reduction of the load-bearing sections, with a resulting reduction in material costs of even up to 30%. In some cases they contain small quantities of chromium, nickel, etc., coming from scrap or from the raw material. The percentage content of these elements is so small that their influence is insignificant and they are not therefore considered in the Standard. The lack of alloy elements means that the hardening is limited. Non-alloy structural steels are also known as high-yield steels due to cold reduction by cold-drawing and cold-rolling.

These steels are also suitable for welding, hot and cold deformation. They are generally used in natural state, but they may be normalized or hardened and tempered when required for the specific use, such as for the production of shafts, lightly stressed machine parts, bolts and screws.

The most common non-alloy structural steels are:

S235JR – S235J2 – S275JR – S275J0 – S355J2 – E295 – E335