Titanium Grade 16
Titanium Grade 16
Engineering Reference for Cost-Optimized Palladium-Alloyed Titanium
Titanium Grade 16 is a palladium-alloyed commercially pure titanium developed to provide enhanced corrosion resistance compared with Grade 2, while maintaining a lower cost profile than Grade 7.
It is designed for applications where corrosion risk exists, but does not justify the full upgrade to Grade 7.
In engineering practice, Grade 16 serves as a risk-balanced material option between standard CP titanium and high-palladium alloys.
1. Material Classification
Titanium Grade 16 belongs to the category of Palladium-Alloyed Commercially Pure Titanium.
Base material: Commercially Pure Titanium
Alloying element: Low-level Palladium (Pd)
Design purpose: Improve corrosion resistance in mildly aggressive environments
Grade 16 extends the usable range of CP titanium without significantly increasing material cost.
2. Chemical Composition (Engineering Perspective)
Titanium Grade 16 contains a smaller palladium addition than Grade 7.
Titanium (Ti): Balance
Palladium (Pd): ~0.04–0.08%
Oxygen, Iron, Nitrogen, Carbon, Hydrogen: Strictly controlled
The reduced palladium content provides partial corrosion enhancement while limiting cost impact.
3. Mechanical Properties
Mechanically, Grade 16 behaves similarly to other CP titanium grades:
Comparable strength to Grade 2
Excellent ductility and formability
Stable mechanical performance
Grade 16 is not a strength-driven material, but a corrosion-performance optimization.
4. Corrosion Resistance Characteristics
Grade 16 improves corrosion resistance by:
Enhancing re-passivation behavior
Improving stability in mildly reducing environments
Reducing sensitivity to localized corrosion
Engineering comparison
Grade 16 is effective where some corrosion uncertainty exists, but conditions are not extreme.
5. When Grade 16 Makes Engineering Sense
Grade 16 is often selected when:
Operating conditions are moderately aggressive
Flow conditions are generally good, but not guaranteed
Crevice risk exists but is limited
Budget constraints discourage full Grade 7 adoption
Engineering rule
Grade 16 is appropriate when risk exists, but extreme conservatism is unnecessary.
6. Typical Applications of Titanium Grade 16
Grade 16 is commonly used in:
Marine systems with controlled flow
Seawater heat exchangers with improved design
Industrial cooling systems
Desalination equipment under moderate conditions
Petrochemical systems with limited reducing environments
Grade 16 is frequently applied in selected zones, not throughout entire systems.
7. Product Forms Commonly Supplied in Grade 16
Titanium Grade 16 is available in standard CP titanium product forms:
Tubes and tubing
Pipes
Plates and sheets
Bars and forgings
This allows seamless integration into systems originally designed for CP titanium.
8. Grade 16 vs Grade 2 vs Grade 7 – Engineering Comparison
9. Engineering Limits and Proper Use
Grade 16 should not be used when:
Severe stagnation or fouling is expected
Strong reducing acids are present
Design conditions are highly uncertain
In such cases, Grade 7 provides a safer margin.
10. Applicable Standards and Specifications
Titanium Grade 16 is commonly supplied in accordance with:
ASTM B265 – Plates and sheets
ASTM B338 – Heat exchanger and condenser tubes
ASTM B861 / B862 – Pipes
ASTM B348 – Bars and billets
ASME SB equivalents
Material certification is typically provided per EN 10204 3.1 / 3.2.