Mild Steel (MS) vs Stainless Steel (SS)
Mild steel (low-carbon steel) and stainless steel are two completely different families. MS is cheaper and stronger per rupee but rusts. SS contains chromium that forms a protective oxide layer, making it corrosion-resistant — but at 4–8× the price.
Side-by-side comparison
| Attribute | Mild Steel (MS) | Stainless Steel (SS) |
|---|---|---|
| Carbon content | 0.05–0.25% | 0.03–0.10% (austenitic) |
| Chromium | — | 10.5% minimum |
| Density | 7.85 g/cc | 7.93 g/cc (304) |
| Tensile strength | 400–550 MPa | 485–620 MPa |
| Corrosion resistance | Poor — rusts rapidly | Excellent |
| Cost per kg | ₹60–80 (baseline) | ₹180–280 (3–4×) |
| Weldability | Excellent | Good (use proper technique) |
| Magnetic | Yes | Usually no (austenitic) |
| Best for | Structural, automotive, construction | Food, marine, chemical, decorative |
When to choose Mild Steel (MS)
Choose mild steel for structural fabrication, automotive parts, construction beams, and any application that will be painted or galvanised — and where cost is critical.
Buy Mild Steel (MS) on MetaleMartWhen to choose Stainless Steel (SS)
Choose stainless steel when corrosion is a concern, when the surface must remain bright, or when long-term maintenance must be minimised — food, pharma, marine, architectural.
Buy Stainless Steel (SS) on MetaleMartFrequently asked questions
Can I paint mild steel to prevent rust?
Yes — primer + paint, galvanising, or powder coating all work well. But the protection lasts only as long as the coating remains intact.
Is stainless steel always better?
No — for hidden structural members that will be coated or buried in concrete, MS is more economical and equally durable.
What is the price ratio MS : SS?
Roughly 1 : 3 to 1 : 4 depending on grade. SS 202 narrows this to ~1 : 2.5; SS 316 widens it to ~1 : 5.