Ti-6Al-4V (Grade 5) vs 316 Stainless
Ti-6Al-4V and 316 Stainless both resist corrosion well, but they sit at opposite ends of the cost-versus-performance curve. The right pick depends on whether weight, machinability, and budget or chloride immunity and strength-to-weight drive your part.
The verdict
Choose Ti-6Al-4V when weight, fatigue life, or seawater/chloride corrosion are critical and you'll pay a premium to get them — aerospace, marine, and medical implants. Choose 316 Stainless when cost, easy welding and machining, and broad availability matter more than shaving weight. For most general-purpose corrosion-resistant parts, 316 is the pragmatic default; titanium is the specialist's upgrade.
Side-by-side data
| Property | Ti-6Al-4V (Grade 5) | 316 Stainless |
|---|---|---|
| Category | Titanium | Stainless Steel |
| Density (g/cm³) | 4.43 | 8.0 |
| Tensile strength (MPa) | 1000 | 515 |
| Yield strength (MPa) | 910 | 240 |
| Elongation (%) | 14 | 40 |
| Hardness | 36 HRC | 217 HB |
| Max service temp (°C) | 400 | 870 |
| Machinability | ●●●●● | ●●●●● |
| Corrosion resistance | ●●●●● | ●●●●● |
| Relative cost | ●●●●● | ●●●●● |
| Thermal cond. (W/m·K) | 6.7 | 16 |
| Typically used for | Aerospace & medical — best strength-to-weight | Marine, medical & chemical environments |
Which should you choose?
Choose Ti-6Al-4V if…
- Every gram counts — aerospace structures, drones, motorsport, or portable gear where strength-to-weight is decisive.
- The part sees warm seawater or chloride-rich media that can pit or crevice-corrode 316 over time.
- It's a load-bearing medical or dental implant needing biocompatibility plus high fatigue strength.
- You need high specific strength retained at moderately elevated temperatures (roughly up to ~300-400°C).
- The performance justifies higher material and machining cost in a low-to-mid volume, high-value part.
Choose 316 Stainless if…
- Budget and material availability matter — 316 costs a fraction of titanium and is stocked everywhere.
- The part must be welded routinely; 316 welds easily with standard filler and no inert-gas chamber.
- You're machining complex geometry in volume and want to avoid titanium's slow speeds, tool wear, and fire risk.
- Weight isn't critical, so a denser but cheaper, tougher material is the pragmatic pick.
- You need good ductility for forming, bending, or deep draws, plus solid general corrosion resistance.
Key differences that matter
- Strength-to-weight: Ti-6Al-4V's real edge isn't raw strength but specific strength — it roughly matches steel strength at about 60% of the density, the whole reason aerospace pays for it.
- Machinability: 316 is far easier and cheaper to machine; titanium's low thermal conductivity and work-hardening mean slow feeds, frequent tool changes, and flood coolant.
- Corrosion: Both resist most environments, but titanium's passive oxide is essentially immune to the chlorides and crevice attack that can eventually pit 316 in warm seawater.
- Weldability: 316 welds with conventional MIG/TIG; titanium demands full inert-gas shielding and back-purge because it embrittles by absorbing oxygen and nitrogen when hot.
- Cost: 316 wins decisively on both material price and total fabrication cost — titanium is justified only when its properties are genuinely required.
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Open the Material SelectorGet a Quote →Frequently asked questions
Is Ti-6Al-4V stronger than 316 Stainless?
Yes — Ti-6Al-4V has substantially higher yield and tensile strength than annealed 316, and an even larger advantage on a per-weight (specific strength) basis. 316 can be cold-worked to raise its strength, but it stays well below titanium while weighing much more.
Which is cheaper, titanium or 316 stainless?
316 Stainless is far cheaper — typically several times less per kilogram than Ti-6Al-4V, and cheaper still once you factor in faster machining and easier welding. Titanium's premium comes from both raw material and harder fabrication, so it's only worth it when weight or corrosion demands it.
Can I machine and weld Ti-6Al-4V like stainless?
Not as easily. Machining titanium needs slower speeds, sharp tooling, rigid setups, and good coolant due to heat buildup and fire risk from fine chips. Welding requires full inert-gas (argon) shielding, including back-purging, or the weld embrittles. 316 tolerates conventional machining and welding with standard equipment.
Which has better corrosion resistance in seawater?
Titanium. Both perform well, but Ti-6Al-4V is essentially immune to chloride pitting and crevice corrosion, while 316 can eventually pit or suffer crevice attack in warm, stagnant seawater. For long-term marine immersion or chemically aggressive service, titanium is the safer choice.
Why pick 316 if titanium outperforms it on most properties?
Because performance per dollar usually decides real projects. 316 is cheaper, universally available, far easier to weld and machine, tougher, and more ductile for forming. Unless you specifically need titanium's low weight, fatigue life, or chloride immunity, 316 delivers reliable corrosion resistance at a fraction of the total cost.
Property values are typical/nominal figures for early-stage guidance only and vary by temper, grade, supplier and heat treatment. Confirm critical specifications against a certified datasheet or with an mfgiq engineer before production.