Titanium Grade 16 tubes (UNS R52402) are made to ASTM B338 in seamless and welded form for service that needs more crevice corrosion resistance than Grade 2. Grade 16 is essentially Grade 2 titanium with 0.04% to 0.08% palladium, around one third of the palladium content used in Grade 7. This addition improves resistance in hot chloride environments and reducing acids, making Grade 16 a practical alternative to Grade 7 when material cost is also a consideration. Amardeep Steel supplies Titanium Grade 16 tubes with EN 10204 3.1 mill test certificates and full heat traceability. Compare our ASTM B338 Grade 7 titanium tubes, or browse our range of titanium pipes and tubes.
What Are Titanium Grade 16 Tubes?
Palladium makes titanium far more resistant to crevice corrosion and to reducing acids such as dilute hydrochloric and sulphuric acid. Grade 16 was developed as a lower palladium version of Grade 7, keeping most of the corrosion benefit while cutting cost. Its strength matches Grade 2.
Grade 16 or Grade 7?
Grade 7 (0.12% to 0.25% Pd) remains the choice for the most aggressive hot reducing service. Grade 16 suits most hot brine and chloride duties where Grade 2 would suffer crevice attack, at lower cost. Where palladium cost is the concern and service is milder, Grade 12 is another option.
Titanium Grade 16 Tube Specifications
Parameter | Details |
|---|---|
Grade | Titanium Grade 16 (Ti-0.05Pd) |
UNS | R52402 |
Tube standard | ASTM B338 / ASME SB338 (seamless and welded tubes for condensers and heat exchangers) |
Pipe standards | ASTM B861 (seamless pipe), ASTM B862 (welded pipe) |
Type | Seamless and welded |
Tube sizes | 6.35 mm to 50.8 mm OD as standard, 0.5 mm to 3 mm wall; other sizes on request |
Forms | Straight lengths, U-bend tubes, coils |
Condition | Annealed; welded tubes stress relieved after welding |
Length | Random, fixed and cut lengths |
Test Certificate | EN 10204 3.1, with 3.2 available on request |
Titanium Grade 16 Chemical Composition
Element | Content (%) |
|---|---|
Nitrogen (N) | 0.03 max |
Carbon (C) | 0.08 max |
Hydrogen (H) | 0.015 max |
Iron (Fe) | 0.30 max |
Oxygen (O) | 0.25 max |
Palladium (Pd) | 0.04 to 0.08 |
Residual elements, each | 0.1 max |
Residual elements, total | 0.4 max |
Titanium (Ti) | Balance |
Titanium Grade 16 Mechanical Properties
Property (ASTM B338) | Value |
|---|---|
Tensile Strength, min | 345 MPa (50 ksi) |
Yield Strength (0.2% offset), min | 275 MPa (40 ksi) |
Elongation in 50 mm, min | 20% |
Titanium Grade 16 Physical Properties
Property | Typical value |
|---|---|
Density | 4.51 g/cm³ |
Melting point | About 1660°C |
Modulus of elasticity | About 103 to 107 GPa |
Mean thermal expansion (20°C to 100°C) | About 8.6 µm/m·°C |
Magnetic | Non-magnetic |
Typical values for commercially pure and low alloy titanium. Values for each heat are on the mill certificate.
Titanium Grade 16 Equivalent Grades
Standard | Designation |
|---|---|
UNS | R52402 |
Common names | Titanium Grade 16, Ti-0.05Pd |
Base grade | Grade 2 chemistry plus palladium |
ASTM tube / pipe | B338 / B861 / B862 |
Titanium Grade 7 vs Grade 16 vs Grade 12
Property (ASTM B338) | Grade 7 | Grade 16 | Grade 12 |
|---|---|---|---|
Alloying addition | Pd 0.12 to 0.25% | Pd 0.04 to 0.08% | Mo 0.2 to 0.4%, Ni 0.6 to 0.9% |
Oxygen, max | 0.25% | 0.25% | 0.25% |
Tensile strength, min | 345 MPa (50 ksi) | 345 MPa (50 ksi) | 483 MPa (70 ksi) |
Yield strength, min | 275 MPa (40 ksi) | 275 MPa (40 ksi) | 345 MPa (50 ksi) |
Crevice corrosion resistance | Highest | Close to Grade 7 | Better than Grade 2 |
Relative cost | Highest | Lower than Grade 7 | Lower, no precious metal |
For the highest palladium content, see our ASTM B338 Grade 7 titanium tubes. For a palladium free option, see our Titanium Grade 12 tubes.
Titanium Grade 16 Tube Size and Weight Chart
Tube OD, in (mm) | 22 BWG (0.71 mm) | 20 BWG (0.89 mm) | 18 BWG (1.24 mm) | 16 BWG (1.65 mm) | 14 BWG (2.11 mm) |
|---|---|---|---|---|---|
1/2" (12.70) | 0.12 | 0.15 | 0.20 | 0.26 | 0.32 |
5/8" (15.88) | 0.15 | 0.19 | 0.26 | 0.33 | 0.41 |
3/4" (19.05) | 0.18 | 0.23 | 0.31 | 0.41 | 0.51 |
7/8" (22.23) | 0.22 | 0.27 | 0.37 | 0.48 | 0.60 |
1" (25.40) | 0.25 | 0.31 | 0.42 | 0.56 | 0.70 |
1 1/4" (31.75) | 0.31 | 0.39 | 0.54 | 0.70 | 0.89 |
1 1/2" (38.10) | 0.38 | 0.47 | 0.65 | 0.85 | 1.08 |
2" (50.80) | 0.50 | 0.63 | 0.87 | 1.15 | 1.46 |
Weights are in kg/m, calculated as (OD minus wall) x wall x π x 4.51 / 1000. Condenser tubes are most often 20 to 22 BWG; heavier walls on request.
Applications of Titanium Grade 16 Tubes
- Heat exchangers in hot chloride brines
- Chemical process tubing in dilute reducing acids
- Chlor-alkali and chlorine dioxide plant equipment
- Gaskets and crevice prone joints in titanium systems
- Hydrometallurgy and pressure leaching circuits
Testing and Documentation
Every order of Titanium Grade 16 tube goes through the checks below at our testing facility or approved third party labs.
- Chemical analysis, including hydrogen, oxygen and nitrogen
- Tension test
- Flattening and flaring tests; reverse flattening on welded tube
- Eddy current or ultrasonic test
- Hydrostatic or pneumatic test on each tube
- Visual and dimensional inspection
Mill test certificates are issued to EN 10204 3.1, with 3.2 available on request. You can view our approvals on the certificates page.
Packing and Marking
Each tube is marked with ASTM B338, Titanium Grade 16, size, heat number and manufacturer name. Tubes are capped, sleeved in polythene and packed in wooden boxes so they never touch carbon steel. Read more about our packing and despatch process.
Request a Quote for Titanium Grade 16 Tubes
Send us the OD, wall or BWG, seamless or welded, length or U-bend details and quantity, and our team will reply with price and delivery. Use the enquiry form or reach us through the contact page.
Frequently Asked Questions
What is Titanium Grade 16?
Titanium Grade 16 (UNS R52402) is Grade 2 titanium with 0.04% to 0.08% palladium, often written Ti-0.05Pd. It is a lower palladium alternative to Grade 7.
What are the mechanical properties of Grade 16 titanium tube?
ASTM B338 sets 345 MPa (50 ksi) minimum tensile strength, 275 MPa (40 ksi) minimum yield strength and 20% minimum elongation for Grade 16.
What is the difference between Titanium Grade 16 and Grade 7?
Both add palladium to Grade 2 titanium. Grade 7 has 0.12% to 0.25% palladium; Grade 16 has 0.04% to 0.08%, giving close corrosion resistance at a lower cost.
Which standard covers Titanium Grade 16 tubes?
ASTM B338 / ASME SB338 covers seamless and welded tubes. ASTM B861 and B862 cover seamless and welded pipe.
