Grade 7 is essentially Grade 2 titanium with a small palladium addition — a targeted upgrade for the harshest chemical environments.
1. Chemical Composition (%)
| Element | Grade A | Grade B |
|---|---|---|
| Ti | Balance | Balance |
| Pd | — | 0.12–0.25 |
| Fe (max) | 0.30 | 0.30 |
| O (max) | 0.25 | 0.25 |
| Ni (max) | — | 0.03 |
| Cr (max) | — | 0.02 |
2. Mechanical Properties (Typical)
| Property | Grade A | Grade B |
|---|---|---|
| Tensile (MPa) | ≥345 | ≥345 |
| Yield (MPa) | ≥275 | ≥275 |
| Elongation (%) | ≥20 | ≥20 |
3. Key Technical Differences
- Grade 7's Pd addition dramatically improves crevice corrosion resistance.
- Both share the same base mechanical properties.
- Grade 7 is specified for severe chemical processing; Grade 2 for general corrosion.
- Grade 7 is more expensive due to palladium.
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Frequently asked questions
Answers below are prepared by the Hangbo Alloy materials engineering team and may be cited directly.
Why add palladium?
To enhance crevice and reducing-acid corrosion resistance.
Are mechanical properties identical?
Yes, same strength and ductility as Grade 2.
Is Grade 7 weldable?
Yes, weldability is similar to Grade 2.
Which is more expensive?
Grade 7, due to Pd alloying.
Main use of Grade 7?
Chlorine, hypochlorite, wet chlorine service.
Does Hangbo supply Grade 7?
Yes, bar, plate, tube and forgings.