Grade 2 vs Grade 5 Titanium: Which Should You Choose
In this blog, we’ll break down the properties, applications, and advantages of oxygen-free copper, helping you understand why it’s preferred over standard copper in various industries.
Grade 2 vs Grade 5 Titanium: Which Should You Choose?
Grade 2 and Grade 5 are the two most-used titanium grades — and they’re chosen for almost opposite reasons. Grade 2 is the corrosion-resistant all-rounder; Grade 5 is the high-strength alloy. Here’s how to decide.
Grade 2: commercially pure titanium
Grade 2 is unalloyed (commercially pure) titanium. Its strengths are excellent corrosion resistance, good weldability, and easy forming. Tensile strength sits in the ~345–485 MPa range — modest, but more than enough for chemical, marine, and architectural work where the enemy is corrosion, not load.
Grade 5: Ti-6Al-4V alloy
Grade 5 adds roughly 6% aluminium and 4% vanadium, pushing tensile strength to around 895–1000 MPa — close to triple Grade 2. That strength-to-weight ratio is why it dominates aerospace and high-stress structural parts. The trade-off: it’s harder to weld and form, and it costs more.
Quick comparison
- Strength: Grade 5 is far stronger; Grade 2 is moderate.
- Corrosion resistance: Both excellent; Grade 2 slightly better in some media.
- Weldability/formability: Grade 2 wins.
- Cost: Grade 2 is more economical.
- Best for: Grade 2 → chemical, marine, sheet work (titanium sheet specs). Grade 5 → aerospace and load-bearing parts, bar stock (titanium round bar).
FAQ
Is Grade 5 always better? No — if you don’t need the strength, Grade 2 is cheaper, easier to fabricate, and equally corrosion-resistant.
Which is used for medical implants? Both; Grade 23 (Grade 5 ELI) is common for implants requiring high purity.
Not sure which grade your project needs? Talk to our team or read the full titanium grades guide.
FAQ's
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A: Carbon steel relies on carbon content alone for its properties. Alloy steel adds elements like chromium, nickel, molybdenum, and vanadium to achieve specific improvements — higher strength, better low-temperature toughness, creep resistance, or corrosion resistance — giving it a far broader performance range than carbon steel.
A: For ambient to 400°C service, ASTM A516 Grade 70 is the standard choice. For high-temperature refinery or power plant use (up to 600°C), ASTM A387 Grade 11 or 22 (chrome-moly) applies. For cryogenic service down to -196°C, 9% nickel steel (ASTM A553) is required.
A: Wear-resistant grades like AR400/AR500 are quenched to martensitic hardness of 370–500 HB — 3–4× harder than structural grades like A572-50. They resist abrasive wear in mining and construction equipment but have limited weldability and are not suitable as primary structural members.
A: CE (= C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15) predicts susceptibility to hydrogen-induced cold cracking during welding. Sheets with CE above ~0.40 require preheating to slow cooling and allow hydrogen diffusion, preventing weld cracking. Always develop a qualified WPS based on the specific CE value.
