304 vs 316 Stainless Steel: What’s the Difference & Which Grade Should You Choose?
Quick Summary
Grade 304 and 316 are the two most widely used austenitic stainless steel grades in Malaysia. The primary difference is that 316 contains 2–3% molybdenum, giving it superior resistance to chloride corrosion and pitting. Grade 304 is the more affordable all-rounder, while 316 (typically 316L) is the necessary upgrade for marine, chemical, and saltwater-exposed applications.
This article compares both grades side by side – covering composition, performance, pricing, and practical guidance on which to use for common Malaysian applications.
“Should I use 304 or 316?”
It’s the most common question in stainless steel specification – and for good reason. These two grades look identical, feel identical, and in many indoor environments, perform almost identically. The difference only shows up when corrosion conditions get serious.
Choosing the wrong grade can mean replacing corroded equipment in 3–5 years instead of getting 20+ years of service life. But choosing the more expensive grade when it’s not needed means paying a significant premium for protection you don’t require.
Let’s break down exactly where each grade excels.
Chemical Composition
Both grades belong to the austenitic family – meaning they have a face-centred cubic crystal structure, are non-magnetic (or very slightly magnetic after cold working), and cannot be hardened by heat treatment.
The critical difference is in the alloying elements:
| Element |
Grade 304 |
Grade 316 / 316L |
Why It Matters |
| Chromium (Cr) |
18–20% |
16–18% |
Forms the corrosion-resistant passive layer |
| Nickel (Ni) |
8–10.5% |
10–14% |
Stabilises austenitic structure, improves toughness |
| Molybdenum (Mo) |
None |
2–3% |
Key differentiator – resists chloride pitting |
| Carbon (C) |
0.08% max |
0.03% max (316L) |
Low carbon reduces weld sensitisation |
According to the British Stainless Steel Association, the addition of molybdenum in 316 significantly improves resistance to pitting and crevice corrosion, particularly in chloride-containing environments. This single element is what justifies the price premium.
Corrosion Resistance: Where 316 Wins
In standard atmospheric conditions – indoor air, clean water, mild chemicals – both grades perform virtually the same. The divergence happens when chlorides enter the picture.
Chloride & Saltwater Exposure
Chloride ions (found in seawater, road salt, bleach, and many industrial chemicals) attack the passive layer that protects stainless steel from corrosion. Without molybdenum, grade 304 is vulnerable to pitting corrosion – small, deep holes that penetrate the surface and can lead to structural failure.
Grade 316’s molybdenum content strengthens the passive layer against chloride attack. This is why 316L is specified for coastal buildings in Malaysia, offshore platforms, swimming pool equipment, and chemical plants handling chlorinated solutions.
Acid Resistance
Grade 316 also outperforms 304 against sulphuric acid, phosphoric acid, and acetic acid at elevated temperatures. For food processing operations that involve acidic products (vinegar, citrus, fermented foods), 316L provides an extra margin of safety.
Mechanical Properties
The mechanical differences between the two grades are modest, but relevant for engineering applications:
| Property |
Grade 304 |
Grade 316L |
| Tensile Strength |
515–620 MPa |
485–620 MPa |
| Yield Strength (0.2%) |
205 MPa |
170 MPa |
| Elongation at Break |
40% |
40% |
| Hardness (Brinell) |
201 HB |
217 HB |
Both grades have excellent formability and weldability. Grade 304 has a slightly higher yield strength, but in practice, both perform similarly in structural and fabrication applications. The choice between them should be driven by corrosion requirements, not mechanical strength.
Price Difference
Grade 316L typically costs 20–30% more than 304 – and the gap widens when nickel and molybdenum prices rise on global commodity markets. According to industry data, nickel accounts for 35–45% of the raw material cost of 300-series alloys, and 316 uses more nickel plus the additional molybdenum.
For a Malaysian project, this price difference can be significant at scale. A contractor specifying 316L for an entire commercial kitchen when 304 would suffice could be adding 20–30% to the material budget unnecessarily. Conversely, specifying 304 for a coastal railing to save money will likely result in costly replacement within a few years.
The key principle: match the grade to the environment, not the budget. For detailed pricing information, see our stainless steel plate pricing guide.
Which Grade for Which Application?
| Application |
Recommended Grade |
Reason |
| Indoor kitchen equipment |
304 |
No chloride exposure, standard conditions |
| Architectural cladding (inland) |
304 |
Normal atmospheric corrosion only |
| Food processing (acidic products) |
316L |
Acid and chemical resistance required |
| Coastal railings & fixtures |
316L |
Saltwater/chloride exposure |
| Chemical tanks & vessels |
316L |
Chemical corrosion resistance |
| Decorative panels (indoor) |
304 or 430 |
Minimal corrosion risk, cost-driven |
| Automotive exhaust |
439 |
High-temperature performance |
| Swimming pool fittings |
316L |
Chlorinated water exposure |
Conclusion
The 304 vs 316 decision comes down to one question: will the material be exposed to chlorides or aggressive chemicals? If yes, 316L is the only responsible choice. If no, 304 delivers excellent performance at a lower price point.
Don’t over-specify (wasting budget on 316L where 304 will do) or under-specify (using 304 in a corrosive environment to save money). Either mistake costs more in the long run than getting the grade right from the start.
At NY Hardware, we stock both 304 and 316L plates in all standard sizes, with custom cutting available. Our team can help you determine the right grade for your specific application and environment. Get in touch for a quote.
For more guidance, explore our complete guide to stainless steel plate grades and sizes or learn how to choose a reliable supplier in Malaysia.