Ti Grade 1 (CP) vs Ti Grade 2 (CP)
Ti Grade 1 and Grade 2 are both commercially pure (CP) titanium, differing mainly in strength and formability. Grade 1 is the softest and most ductile CP grade, chosen when maximum formability is needed. Grade 2 is the workhorse standard, offering higher strength while remaining readily formable. Both share titanium's outstanding corrosion resistance, so the choice usually balances strength against forming demands.
The verdict
Choose Grade 1 when maximum formability and ductility are essential — deep draws, tight bends, and explosive cladding. Choose Grade 2 for the best all-round balance, when you need higher strength without giving up much workability, which is why it is the most widely used CP titanium grade.
Side-by-side data
| Property | Ti Grade 1 (CP) | Ti Grade 2 (CP) |
|---|---|---|
| Category | Titanium | Titanium |
| Density (g/cm³) | 4.51 | 4.51 |
| Tensile strength (MPa) | 240 | 485 |
| Yield strength (MPa) | 170 | 380 |
| Elongation (%) | 24 | 20 |
| Hardness | 120 HB | 200 HB |
| Max service temp (°C) | 425 | 425 |
| Machinability | ●●●●● | ●●●●● |
| Corrosion resistance | ●●●●● | ●●●●● |
| Relative cost | ●●●●● | ●●●●● |
| Thermal cond. (W/m·K) | 16 | 17 |
| Typically used for | Corrosion-resistant formed parts | Corrosion-critical, formable titanium |
Which should you choose?
Choose Ti Grade 1 (CP) when…
- Maximum formability and ductility are required for deep draws or tight bends
- The part is cold-formed sheet, plate cladding, or explosion-bonded layers
- Highest elongation (~24%) among the CP grades is needed
- Excellent corrosion resistance (rating 5.0) is essential in chemical service
- Strength demands are low and forming is the governing requirement
- Anode and equipment liners that prioritize workability over strength
Choose Ti Grade 2 (CP) when…
- You want the standard, most available CP titanium grade
- Higher strength (~485 MPa tensile, ~380 MPa yield) is needed than Grade 1 offers
- The part still requires good formability with ~20% elongation
- Corrosion resistance (rating 5.0) for chemical or marine service is critical
- A balanced strength-and-formability workhorse fits the application
- Heat exchangers, piping, and pressure-vessel components are involved
Key differences that matter
- Both are unalloyed commercially pure titanium with maximum corrosion resistance (rating 5.0)
- Grade 2 is stronger (tensile ~485 vs ~240 MPa, yield ~380 vs ~170 MPa) because of slightly higher controlled interstitials like oxygen
- Grade 1 is more ductile (elongation ~24% vs ~20%), making it the most formable CP grade
- Grade 2 is the industry-standard workhorse; Grade 1 is reserved for the most demanding forming and cladding
- Both have identical density (~4.51) and similar machinability (2.0), well below most steels
- Neither is heat-treatable to higher strength like the alpha-beta alloy Ti-6Al-4V; strength comes from grade chemistry
- Cost index is the same (4.5), so selection is driven by the strength-versus-formability tradeoff
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What actually makes Grade 2 stronger than Grade 1?
Both are commercially pure titanium, but Grade 2 contains slightly higher controlled levels of interstitial elements, chiefly oxygen and iron. These raise its strength to about 485 MPa tensile versus roughly 240 MPa for Grade 1. The tradeoff is marginally lower ductility, though Grade 2 remains very formable for most applications.
Do they differ in corrosion resistance?
Not meaningfully. Both Grade 1 and Grade 2 are commercially pure titanium and carry the maximum corrosion rating of 5.0, resisting seawater, many acids, and oxidizing chemicals through a stable passive oxide film. The choice between them is about strength and formability, not corrosion performance, which is excellent for both.
Which should I pick for a deep-drawn part?
Grade 1 is the better deep-drawing choice. Its higher elongation, around 24%, and lower strength make it the most formable CP grade, ideal for severe cold forming, deep draws, and explosive cladding. Grade 2 forms well too, but Grade 1 tolerates the tightest bends and deepest draws with less risk of cracking.
Can either be strengthened by heat treatment?
No. Commercially pure titanium grades are not significantly hardenable by heat treatment; their strength comes from chemistry and cold work. If you need much higher strength, you move to an alpha-beta alloy like Ti-6Al-4V, which can be heat-treated. For CP titanium, grade selection sets the strength level.
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.