Good Corrosion Resistance ASME SB338 GR7 UNS R52400 Ti Alloy Tube
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ASME SB338 is the standard specification for seamless and welded titanium and titanium alloy tubes or tubing which are intended for surface condensers, evaporators, and heat exchangers. It is identical with ASTM B338 except for some minor difference in product marking. There are 28 grades of titanium and titanium alloys for tubing purpose, among which Titanium Grade 2, Grade 7 and Grade 12 are most often seen in tubing applications.
Titanium Grade 7 (UNS R52400) has similar physical and mechanical properties to Grade 2. It has excellent welding and fabrication properties and is extremely resistant to corrosion, especially acids, due to the addition of palladium.
Chemical Composition Of GR7
| Element | Chemical Composition % |
| Grade 7 |
| Nitrogen, max | 0.03 |
| Carbon, max | 0.08 |
| Hydrogen, max | 0.015 |
| Iron, max | 0.30 |
| Oxygen, max | 0.25 |
| Aluminum | … |
| Vanadium | … |
| Tin | … |
| Ruthenium | … |
| Palladium | 0.12-0.25 |
| Molybdenum | … |
| Chromium | … |
| Nickel | … |
| Niobium | … |
| Ziconium | … |
| Silicon | … |
| Residuals, max each | 0.1 |
| Residuals, max total | 0.4 |
| Titanium | balance |
Titanium Grade 7 Tubing Mechanical Properties
| Grade | Titanium Alloy Gr7 |
| Density | 0.163 lb/in3 |
| Tensile Strength | 50 |
| Yield Strength (0.2%Offset) | 40/65 |
| Elongation | 20% |
Titanium Grade 7 Tubing Physical Properties
| Beta Transus (F ± 25) | 1675 |
| Coefficient of Thermal Expansion (10-6in./in./F) | 32-212 | 4.8 |
| 32-600 | 5.1 |
| 32-1000 | 5.4 |
| 32-1200 | 5.6 |
| 32-1500 | 5.6 |
| Density (lbs./cu. in.) | 0.163 |
| Melting Point, Approx (F) | 3020 |
| Electrical Resistivity at Room Temp. (Microhms cm) | 56 |
| Modulus Elasticity – Tension (106 psi) | 14.9 |
| Modulus Elasticity – Torsion (106 psi) | 6.5 |
Thermal Conductivity
(Btu/hr/sq. ft./F/ft.) | 9.5 at Room Temperature |
| Specific Heat (Btu/lb./F) at Room Temp. | 0.124 |
| Weldability | Good |
| Annealing Temp. (F) | Full | 1300°/30 Min. – 2 Hrs,; Air Cool |
| Stress Relief | 1000-1100°/30 Min.; Air Cool |
| Forging* Temp. (F) | Blocking | 1600-1700° |
| Finishing | 1500-1600° |
| Available Mill Products | Tube, Tubing |
| Typical Application | For corrosion resistance in the chemical industry where media is mildly reducing
or varies between oxidizing and reducing. |
GR7 Material Equivalent
| STANDARD | WERKSTOFF NR. | UNS |
| Titanium Grade 7 | 3.7235 | R52400 |
Applications
-Chlorination systems
-Flue gas scrubbers
-Acid production and pickling systems
-Pharmaceutical industries
-Cellophane manufacturing
-Chlorination systems
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