Steel is manufactured in two different ways – hot rolled or cold rolled. The temperature makes the difference – hot rolling is carried out at around 1000 degrees centigrade and it uses a process that prevents the steel from becoming hard as it is being worked. It is usually used for buildings with a large span, so for large storage buildings, or if heavy equipment or gantries need to be attached to the framework of the building.
Hot rolled steel is usually thicker than cold rolled steel and is, therefore, stronger and more robust. It is used for portal frame buildings and it’s also great for oddly shaped buildings rather than the traditional rectangle, as well as being useful for more corrosive environments.
National Steel Buildings can offer hot rolled steel buildings painted in whatever colour you choose, or it can be post galvanised to make it even stronger.
Cold rolling is carried out at room temperature. It doesn’t need to be cooled so there is less of a tendency for it to break which is sometimes the case with hot rolled. Although it’s only really been used extensively for construction purposes in the last two decades, it was first developed during the first world war. It suits smaller spans of up to around 24 metres.
It’s much lighter to handle, has a high strength to weight ratio and foundations for cold-rolled steel buildings do not need to be as deep as for those with hot rolled steel, which makes it more cost-effective. All of our Cold rolled steel structures are pre-galvanised, making them strong and durable.
National Steel Buildings can supply and erect a large range of both hot- and cold-rolled buildings so get in touch with us and we will give you a personal quotation.