Choosing a sheet metal material.

There is rarely a single right material, only the best fit for the job. The notes below cover the materials we work in most, what each is good at, and where it costs you. If you are not sure, tell us the environment, the loads and the finish, and we will recommend a material and thickness.

Mild steel

The default for a great deal of fabrication: strong, easy to form and weld, and the most cost-effective option for most jobs.

• Strong and readily formed, ideal for brackets, frames, enclosures and general fabrication.
• Not corrosion resistant on its own, so it needs paint, powder coat or galvanising if it will see moisture.
• Cold-reduced steel such as CR4 gives a smooth surface for a good painted finish; hot-rolled suits heavier gauges where finish matters less.

Stainless steel

Corrosion resistant, hygienic and good-looking, which is why it suits food, medical, architectural and outdoor work. Stainless welding and fabrication is a particular specialism of ours.

• 304 is the general-purpose grade for most architectural and interior work.
• 316 adds resistance for marine, coastal or chemical environments.
• More expensive than mild steel, and it work-hardens, so it needs the right technique and care to keep the finish clean and grain-matched.

Aluminium

Light and naturally corrosion resistant, aluminium is the go-to where weight matters or a part lives outdoors without a coating.

• Around a third the weight of steel, and corrosion resistant without finishing.
• Forms and machines well in the right grade; 5251 and 5083 form well, while 6082 is stronger.
• Softer than steel and marks more easily, and welding needs the correct technique and filler.

Coated and galvanised steel

Where you want corrosion protection without a separate finishing step, pre-galvanised or zinc-coated steel can be a practical middle ground.

• Gives built-in corrosion protection, useful for outdoor or damp environments.
• Cut and welded edges lose the coating locally and may need touching up.