Mild or galvanised steel: which should you choose?

“Mild steel” here refers to ungalvanised steel; this alone does not specify its grade or surface condition. State the material reference, thickness and required appearance, particularly for painted or visible parts.

Bare steel needs suitable protection when exposed to moisture. This may include surface preparation and painting: compare the complete system, not just the sheet price.

Galvanising provides a zinc coating that protects steel against corrosion. It does not make the part immune to every environment or replace choosing a suitable mechanical grade.

Distinguish sheet galvanised before cutting from an assembly hot-dip galvanised after fabrication. Treated surfaces, design constraints and possible repairs differ. Specify the required process when requesting a quote.

Operations after galvanising can locally damage the coating. Inspect cuts, welds and reworked areas to determine whether protection needs repairing.

Welding galvanised steel requires a suitable procedure, including fume control. Have the workshop define weld preparation, extraction and restoration of protection after assembly.

For a cover in a plant room, first describe humidity, cleaning, visible faces and joints. Then request a comparison, at identical geometry and quantity, between finished steel and galvanised sheet with any necessary repairs.

For an assembly with many welds, also ask whether protection after assembly is appropriate. This avoids selecting a cheap sheet whose finishing operations have not been costed.

Compare material, fabrication, finishing and expected maintenance costs. A galvanised surface is not necessarily as uniform as a painted one; provide a visual reference if appearance matters.