When quoting a metal fabrication job, the choice of material is not merely a technical specification the customer has asked for: it is a variable that substantially changes cost, processing time and, as a result, the final price. Understanding the practical differences between mild steel, galvanised steel and stainless helps you quote more accurately.
Bare mild steel (carbon steel)
It is the cheapest material and the simplest to work: cutting, welding and bending are all straightforward, with no special precautions. Its limitation is corrosion protection, which always requires a subsequent treatment — paint or galvanising — if the product is destined for outdoors or a damp environment. On the quote, the material cost is low but must always be accompanied by a finishing line.
Galvanised steel
Hot-dip galvanising protects steel from corrosion through an industrial treatment that adds lead time, because the fabricated piece goes out to an external zinc bath before returning to the shop for final assembly. Material cost is higher than bare steel, and welding on already-galvanised surfaces needs care because it produces fumes that must be handled properly. When quoting, galvanising should always be costed as a separate line, with a lead time added to production.
Stainless steel
It is the most expensive of the three, but offers corrosion resistance with no subsequent treatment and a finish that makes it the choice for exposed work, commercial kitchens, or anywhere appearance matters as much as function. Working it needs dedicated equipment — specific cutting discs, TIG welding for the cleanest finishes — and generally longer times than bare steel. The raw material cost, together with longer processing, shows up in a noticeably higher final price.
How this lands on the quote
A common mistake is to apply the same hourly cost coefficient and the same margin whatever the material. In reality, the choice of material should automatically trigger not only a different material price but also a different processing time and, for galvanised, a different lead time — three variables an accurate quote must keep separate rather than flattening into a generic average.