Structural steel – unalloyed

This is an alloy of iron with up to 0.22% carbon and other elements occurring more as impurities and not as a deliberate addition, but their content must not exceed the limits specified in the standards. Structural steel is divided into two groups, higher quality unalloyed steel and general purpose unalloyed steel. The higher quality steel is suitable for surface hardening, normalisation and quenching. It is used in the manufacture of parts for machinery and equipment not exposed to particular stresses. Rolled bars, drawn bars, cold-rolled sheets and hot-rolled sheets are available from high-grade unalloyed structural steel.

General-purpose non-alloyed structural steel is the simplest and cheapest steel to produce and is used wherever economics make it necessary. It is used in construction, heavy industry and transport. It is used in various types of steel structures, halls, bridges, platforms, masts, railway carriages, car body components, etc. It is available as rolled and drawn bars, hot-rolled sections, cold-formed sections, seamed and seamless tubes, heavy-walled tubes, cold-rolled thin sheets and hot-rolled heavy plates.

Below is a breakdown of these and the range available.

Non-alloy high-grade steel

 

General purpose non-alloy steel