Choosing the wrong material is an expensive mistake. Laser cutting the right metal from the start saves you money, reduces rework, and produces a part that actually performs in its environment. This guide covers all five sheet metals available at QuickCut — what they are, where they excel, and when to avoid them.
Quick Comparison
| Material | Cost | Strength | Corrosion resistance | Weldability |
|---|---|---|---|---|
| Mild Steel | Lowest | Good | Poor (needs coating) | Excellent |
| Stainless 304 | High | Very good | Excellent | Good |
| 3CR12 | Medium | Good | Good | Good |
| BS430 | Medium | Good | Very good (indoors) | Moderate |
| Aluminium | Medium | Good (light) | Very good | Good |
Mild Steel
Mild Steel
The workhorse of sheet metal fabrication. Mild steel is the most affordable material and the easiest to cut, weld and paint. It rusts without a protective coating, but that's rarely a problem when powder coated or painted.
Best for: enclosures, brackets, frames, machine guards, general fabrication, any part that will be painted or powder coated.
Avoid when: the part will be exposed to moisture without a coating, or when hygiene is critical (food / medical environments).
Stainless Steel 304
Stainless Steel 304
The most widely used stainless steel grade worldwide. 304 contains 18% chromium and 8% nickel, giving it excellent corrosion resistance and a bright, attractive finish that requires no coating. It's significantly more expensive than mild steel but often eliminates finishing costs entirely.
Best for: food preparation surfaces, catering equipment, outdoor signage, marine environments, hygienic enclosures, decorative panels.
Avoid when: budget is tight and the part will be painted anyway — mild steel with powder coat achieves similar results at a fraction of the cost.
QuickCut offers 304. Grade 316 has higher chloride resistance for harsh marine or chemical environments, but for most South African applications 304 is sufficient.
3CR12 (Utility Stainless)
3CR12
A South African-developed utility stainless steel with around 12% chromium. It resists corrosion far better than mild steel at a lower cost than 304, and is widely used in mining, agriculture and materials handling. It's magnetic and welds well, but develops light surface staining over time outdoors, so it's chosen for durability rather than looks.
Best for: chutes, hoppers, trailer and truck parts, agricultural equipment, structural parts in wet or abrasive environments.
Avoid when: the part needs to stay bright and attractive without coating, as 3CR12 discolours more than 304 or BS430.
BS430 (Ferritic Stainless)
BS430
A ferritic (magnetic) stainless steel with roughly 17% chromium and no nickel, usually supplied with a bright or brushed finish. It looks like stainless and costs less than 304, which is why it's common on appliance panels and decorative trim.
Best for: kitchen appliance panels, whitegoods, splashbacks, indoor decorative panels, trim.
Avoid when: chloride exposure is a concern (coastal environments, salt spray), because 430 is less resistant than 304 in those conditions.
Aluminium
Aluminium
Aluminium is roughly one-third the weight of steel, which makes it the go-to choice when weight is critical. Common sheet alloys offer good formability, excellent corrosion resistance and moderate strength. It does not rust and develops a natural oxide layer that protects the surface.
Best for: aerospace and automotive parts, electronics enclosures, signage, any application where weight saving matters.
Avoid when: the part requires welding by someone without aluminium MIG/TIG experience — aluminium welding requires different technique and consumables than steel.
Which Material Should You Choose?
Here's a simple decision guide:
- Indoor, painted or powder coated → Mild Steel. Cheapest, easiest, most versatile.
- Food, hygiene, outdoor without coating → Stainless 304. Best all-round corrosion resistance.
- Tough, wet or abrasive conditions on a budget → 3CR12. Far better corrosion resistance than mild steel.
- Stainless look indoors, lower budget → BS430. Good middle ground.
- Weight critical → Aluminium. About one-third the weight of steel.
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