Ti Grade 12 vs Ti Grade 7: Both enhanced-corrosion Ti — different alloying approaches
Ti Grade 12 vs Ti Grade 7
Side-by-side chemical composition and mechanical property comparison.
Overview
Ti Grade 12
Titanium alloy with 0.3% Mo + 0.8% Ni — improved crevice and reducing-acid corrosion resistance over CP grades. Strength similar to Grade 2 but much better in chemical environments containing hot brines and reducing acids. More cost-effective than Grade 7 (Pd). Used for heat exchangers, pressure vessels, and chemical processing equipment in corrosive service.
Ti Grade 7
3.7235
Palladium-enhanced commercially pure titanium — the most corrosion-resistant Ti grade. Same mechanical properties as Grade 2, but with 0.12-0.25% Pd for dramatically improved resistance to reducing acids (HCl, H2SO4) and crevice corrosion. Premium price justified only where extreme chemical resistance is needed. Used for chemical processing equipment, desalination plants, and chlor-alkali cells.
| Ti Grade 12 | Ti Grade 7 | |
|---|---|---|
| Material Number | — | 3.7235 |
| Category | Titanium | Titanium |
| Standard | ASTM B265 | ASTM B265 |
Chemical composition (wt%)
| Element | Ti Grade 12 | Ti Grade 7 | Overlap |
|---|---|---|---|
| C | 0–0.08% | 0–0.08% | OK |
| Mo | 0.2–0.4% | — | — |
| Ni | 0.6–0.9% | — | — |
| Ti | — | — | — |
Mechanical properties
| Property | Ti Grade 12 | Ti Grade 7 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 483 | ≥ 345 | MPa |
| yield_strength | ≥ 345 | ≥ 275 | MPa |
| elongation | ≥ 18 | ≥ 20 | % |
Compatibility Assessment
Grade 7 uses Pd (0.12-0.25%) for crevice corrosion resistance; Grade 12 uses Mo+Ni (cheaper). Both much better than Grade 2 in reducing acids. Grade 12 is stronger (UTS 483 vs 345 min). Grade 7 costs more (Pd premium). Choose Grade 12 for cost-effective chemical service; Grade 7 for maximum crevice resistance.
Frequently Asked Questions
Is Ti Grade 12 the same as Ti Grade 7?
Ti Grade 12 and Ti Grade 7 have a 80% composition overlap. Both enhanced-corrosion Ti — different alloying approaches
Can I replace Ti Grade 12 with Ti Grade 7?
In many cases, yes. The compositions overlap significantly (80%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between Ti Grade 12 and Ti Grade 7?
The main differences are in the following elements: overall alloying content. Ti Grade 12 is a Titanium grade, while Ti Grade 7 is a Titanium grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.