What are the equivalent grades of Grade 1 titanium tube?
| Standard | Grade / UNS / W.Nr. |
|---|---|
| ASTM / ASME | Grade 1 / SB338 Gr.1 |
| UNS | R50250 |
| Werkstoff Nr. (W.Nr.) | 3.7025 |
| Chinese Standard | TA1 |
| Other trade names | Titan Grade 1, CP-1 |
What specifications cover Grade 1 titanium tube?
| Standard | Product Form |
|---|---|
| ASTM B338 / ASME SB338 | Seamless and Welded Tubes for Condensers and Heat Exchangers |
| ASTM B861 / ASME SB861 | Seamless Titanium Pipe |
| ASTM B862 / ASME SB862 | Welded Titanium Pipe |
What is the chemical composition of Grade 1 titanium?
| Element | Weight % (max) |
|---|---|
| Fe | 0.20 |
| O | 0.18 |
| C | 0.08 |
| N | 0.03 |
| H | 0.015 |
| Ti | Balance |
Low oxygen (0.18% max) and low iron (0.20% max) give titanium grade 1 its high ductility. Titanium grade 1 composition is the softest among all titanium grades.
What are the mechanical properties of Grade 1 titanium tube?
| Property | Value |
|---|---|
| Tensile Strength, Ultimate | 240 MPa (35 ksi) min |
| Tensile Strength, Yield (0.2% offset) | 170 – 310 MPa (25 – 45 ksi) |
| Elongation at Break | 24% min |
| Reduction of Area | 35% |
| Hardness, Brinell | 120 (annealed) |
| Hardness, Rockwell B | 70 (annealed) |
| Charpy Impact (V-notch) | 310 J |
High temperature mechanical properties:
| Temperature | Tensile Strength | Yield Strength (0.2% offset) | Elongation |
|---|---|---|---|
| 204°C (399°F) | 193-207 MPa | 110-124 MPa | 40-50% |
| 316°C (601°F) | 152-179 MPa | 83-103 MPa | 30-35% |
| 427°C (801°F) | 124-138 MPa | 76-90 MPa | 25-30% |
Low yield strength and high elongation make titanium grade 1 the most formable titanium grade. Grade 1 titanium yield strength decreases at elevated temperatures while ductility increases.
What are the physical properties of Grade 1 titanium?
| Property | Metric | English |
|---|---|---|
| Density (titanium grade 1 density) | 4.50 g/cm³ | 0.163 lb/in³ |
| Melting Point | ≤1670°C | ≤3040°F |
| Beta Transus | 882°C | 1620°F |
| Thermal Conductivity (annealed) | 16.0 W/m-K | 111 BTU-in/hr-ft²-°F |
| Specific Heat Capacity | 0.520 J/g-°C | 0.124 BTU/lb-°F |
| Electrical Resistivity | 0.0000420 ohm-cm | - |
| Magnetic Permeability | 1.00005 (paramagnetic) | - |
| Poisson's Ratio | 0.37 | - |
| Shear Modulus | 45.0 GPa | 6530 ksi |
Titanium grade 1 density is approximately half that of steel. gr1 titanium pipe weighs about 50% less than steel pipe of the same dimensions.
What sizes are available for Grade 1 titanium tube?
| Parameter | Range |
|---|---|
| Seamless Pipe OD | φ1.0 mm to φ508.3 mm |
| Welded Pipe OD | φ6.0 mm to φ1219 mm |
| Wall Thickness | 0.3 mm to 50 mm (customizable) |
| Length | 5-7 m, 9-13 m, Single/Double Random, Custom |
Standard pipe dimensions and weights (NPS):
| NPS | OD (inch) | OD (mm) | Wall Thickness (inch) | Schedule | Weight (kg/m) |
|---|---|---|---|---|---|
| 1/2″ | 0.84 | 21 | 0.109 | 40 STD | 1.268 |
| 1/2″ | 0.84 | 21 | 0.147 | 80 STD | 1.621 |
| 3/4″ | 1.05 | 27 | 0.113 | 40 STD | 1.684 |
| 3/4″ | 1.05 | 27 | 0.154 | 80 STD | 2.195 |
| 1″ | 1.315 | 33 | 0.133 | 40 STD | 2.501 |
| 1″ | 1.315 | 33 | 0.179 | 80 STD | 3.325 |
| 1-1/4″ | 1.66 | 42 | 0.140 | 40 STD | 3.385 |
| 1-1/4″ | 1.66 | 42 | 0.191 | 80 STD | 4.464 |
| 1-1/2″ | 1.90 | 48 | 0.145 | 40 STD | 4.048 |
| 1-1/2″ | 1.90 | 48 | 0.200 | 80 STD | 5.409 |
| 2″ | 2.375 | 60 | 0.154 | 40 STD | 5.441 |
| 2″ | 2.375 | 60 | 0.218 | 80 STD | 7.480 |
| 3″ | 3.50 | 89 | 0.216 | 40 STD | 11.284 |
| 3″ | 3.50 | 89 | 0.300 | 80 STD | 15.272 |
| 4″ | 4.50 | 114 | 0.237 | - | 16.073 |
| 4″ | 4.50 | 114 | 0.337 | - | 22.318 |
| 6″ | 6.625 | 168 | 0.280 | 40 STD | 28.263 |
| 6″ | 6.625 | 168 | 0.432 | 80 XHY | 42.561 |
| 8″ | 8.625 | 219 | 0.322 | 40 | 42.352 |
| 8″ | 8.625 | 219 | 0.500 | 80 XHY | 64.627 |
| 10″ | 10.75 | 273 | 0.365 | 40 STD | 63.301 |
| 10″ | 10.75 | 273 | 0.500 | 60 XHY | 81.530 |
| 12″ | 12.75 | 324 | 0.375 | - | 73.824 |
| 12″ | 12.75 | 324 | 0.500 | - | 97.438 |
What surface finishes are available for Grade 1 titanium tube?
| Finish | Code | ID Roughness (RA) | OD Roughness (RA) |
|---|---|---|---|
| Bright Annealed | BA | 20-40 μ inch (0.5-1.0 μm) | 32 μ inch (0.8 μm) |
| Electro Polish | EP | 5-15 μ inch (0.13-0.38 μm) | 32 μ inch (0.8 μm) |
| Mechanical Polish | MP | 20-40 μ inch (0.5-1.0 μm) | 32 μ inch (0.8 μm) |
| Annealed & Pickled | AP | Not defined | 40 μ inch or not defined |
What are the key features of Grade 1 titanium tube?
| Feature | Benefit |
|---|---|
| Softest titanium grade | Easiest to form and bend |
| Highest ductility | 24% elongation minimum |
| Excellent corrosion resistance | Withstands seawater, chlorides, and chemicals |
| Good cold formability | Ideal for deep drawing and bending |
| Excellent weldability | Can be welded with ERTi-1 filler |
| High impact toughness | 310 J Charpy impact |
| Low density | 4.50 g/cm³ (half that of steel) |
What industries use Grade 1 titanium tube?
| Industry | Application |
|---|---|
| Chemical Processing | gr1 titanium heat exchanger, reaction vessels, evaporators, delivery pipelines |
| Marine / Desalination | Seawater systems, desalination facilities, grade 1 titanium anode/cathode |
| Automotive | Exhaust systems, charge air pipes, water pipes |
| Oil & Gas | Refineries, petrochemical plants, hydraulic piping |
| Power Industry | Condensers, heat exchangers |
| Pharmaceutical / Food | Processing equipment |
| Pulp & Paper | Chemical processing lines |
FAQ
1. What is CP Grade 1 titanium tube?
CP Grade 1 stands for Commercially Pure Titanium Grade 1. It is the softest and most ductile titanium grade with 24% minimum elongation and excellent formability. It is also known as UNS R50250, W.Nr. 3.7025, and TA1.
2. What is the difference between Grade 1 and Grade 2 titanium tube?
Grade 1 has lower oxygen (0.18% vs 0.25%) and lower iron (0.20% vs 0.30%), resulting in lower yield strength (170 MPa vs 275 MPa) but higher elongation (24% vs 20%). Choose gr1 titanium tube for bending and forming; choose Grade 2 for higher pressure.
3. What is the density of Grade 1 titanium?
Titanium grade 1 density is 4.50 g/cm³ (0.163 lb/in³), which is approximately half that of steel. This makes gr1 titanium pipe significantly lighter than steel pipe of the same dimensions.
4. What filler metal is needed to weld Grade 1 titanium tube?
Use AWS A5.16 ERTi-1 filler metal with automatic TIG welding. Shielding must be 100% argon with back purge. Clean surfaces thoroughly before welding to prevent contamination.
5. Is Grade 1 titanium tube suitable for heat exchangers?
Yes. ASTM B338 Grade 1 is specifically designed for gr1 titanium heat exchanger tubes. It offers excellent thermal conductivity and corrosion resistance in chemical plants, desalination systems, and power generation.
6. What is the minimum bending radius for Grade 1 titanium tube?
Due to 24% elongation, gr1 titanium forming/bending is excellent. Minimum cold bend radius is approximately 1.5-2.0 x OD without mandrel. Annealed condition is best for tight bends.
7. What certifications are provided with Grade 1 titanium tube?
Mill Test Certificates (EN 10204 3.1), Chemical Reports, Mechanical Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, and NABL Approved Lab Reports.
8. What is the difference between ASTM B861 and ASTM B862?
ASTM B861 covers seamless titanium pipe. ASTM B862 covers welded titanium pipe. Both are available in Grade 1. Seamless is preferred for high pressure; welded is more cost-effective for larger diameters.
9. Can Grade 1 titanium tube be used for medical implants?
Commercial ASTM B338 Gr.1 is not for implants. Medical implants require ASTM F67 Grade 1 with biocompatibility testing and ISO 13485 traceability.
