These heavy duty structural sections are often referred to as H-beams and I-beams (because of their cross-sectional appearance). They are mainly used in the frames of industrial and hi-rise structures, are internationally traded and are a stockholder item in standard lengths. Dimensions are in metric, except in the USA where they are sold as “W” shapes in inches.

This is a type of iron, which unlike hard, brittle pig iron – such as is tapped from a blast furnace – is tough and malleable, allowing it to be forged and welded. It has a high tensile strength and is more corrosion resistant than steel. Wrought iron has a very low carbon content – lower than many steels – but importantly it has traces of manganese/sulphur/phosphorus/silicon-containing slag which give it a fibrous structure and which contributes to its desirable properties. 

Metals which after melting, casting and solidifying have been further worked in a hot or cold condition to alter their shape and/or dimensions by rolling, forging, extruding and drawing.

The specified minimum yield strength of steel used in pipe.