Grade 1 Titanium Tube (also known as Cp Grade 1 Titanium Tubing or Ti Cp Grade 1 Seamless Tubing) is one of the softest and most ductile titanium grades, exhibiting the greatest formability. gr1 titanium tube is mainly used in marine and chemical industries where parts are subjected to very harsh environments.
gr1 titanium pipe and gr1 titanium tube are available in seamless, welded, ERW, and fabricated forms. Customized gr1 titanium tube can be supplied in round, square, rectangular, coil, and U-bent shapes.
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 |
| Other trade names | Timetal 35A, Titan Grade 1, Allvac 30 |
What is the chemical composition of Grade 1 titanium?
| Grade | C | N | O | H | Fe | Ti |
|---|---|---|---|---|---|---|
| Titanium Gr.1 | 0.08 max | 0.03 max | 0.18 max | 0.015 max | 0.20 max | Balance |
What are the mechanical properties of Grade 1 titanium tube?
| Property | Value |
|---|---|
| Ultimate Tensile Strength | 35 KSI min (240 MPa min) |
| Yield Strength (0.2% offset) | 25 - 45 KSI (170 - 310 MPa) |
| Elongation | 24% min |
Low yield strength and high elongation make titanium grade 1 the most formable titanium grade. Grade 1 titanium yield strength is ideal for cold bending and deep drawing.
What sizes are available for Grade 1 titanium tube?
Seamless Tube Size: 3.35 mm OD to 101.6 mm OD
Welded Tube Size: 6.35 mm OD to 152 mm OD
Wall Thickness: 0.020" – 0.220" (special wall thicknesses available)
SWG & BWG: 10, 12, 14, 16, 18, 20 Swg.
Length: Single Random, Double Random, Standard & Cut length
Stock sizes (OD):
| NB Sizes (in stock) | 1/8", 1/4", 3/8", 1/2", 5/8", 3/4", 1", 1.25", 1.5", 2", 2.5", 3", 4", 5", 6" |
|---|
Detailed size availability (OD vs Wall Thickness):
| Wall (inch) | Available OD (inch) |
|---|---|
| .010 | 1/16", 1/8", 3/16" |
| .020 | 1/16", 1/8", 3/16", 1/4", 5/16", 3/8" |
| .028 | 1/8", 3/16", 1/4", 5/16", 3/8", 1/2", 3/4", 1", 1-1/2", 2" |
| .035 | 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 3/4", 7/8", 1", 1-1/4", 1-1/2", 1-5/8", 2", 2-1/4" |
| .049 | 3/16", 1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-1/2", 1-5/8", 2", 2-1/4" |
| .065 | 1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/4", 1-1/2", 1-5/8", 1-3/4", 2", 2-1/2", 3" |
| .083 | 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/4", 1-1/2", 1-5/8", 1-7/8", 2", 2-1/2", 3" |
| .095 | 1/2", 5/8", 1", 1-1/4", 1-1/2", 2" |
| .109 | 1/2", 3/4", 1", 1-1/4", 1-1/2", 2" |
| .120 | 1/2", 5/8", 3/4", 7/8", 1", 1-1/4", 1-1/2", 2", 2-1/4", 2-1/2", 3" |
| .125 | 3/4", 1", 1-1/4", 1-1/2", 2", 3", 3-1/4" |
| .134 | 1" |
| .250 | 3" |
| .375 | 3-1/2" |
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 | Seamless Tubing |
| ASTM B862 | Welded Tubing |
Product Forms Available:
Round, Square, Rectangular, Coil, Boiler, Hydraulic
Straight or 'U' bent tubes
Hollow, LSAW tubes
Capillary tubes
Heat exchanger and condenser tubes
Thin wall tubes
Furnace tubes
What surface finishes are available for Grade 1 titanium tube?
| Finish | Code | ID Roughness (RA) | OD Roughness (RA) |
|---|---|---|---|
| Annealed & Pickled | AP | Not defined | 40 μ inch or not defined |
| Bright Annealed | BA | 20-40 μ inch (0.5-1.0 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) |
| Electro Polish | EP | 5-15 μ inch (0.13-0.38 μm) | 32 μ inch (0.8 μm) |
What is the working pressure rating for Grade 1 titanium tube?
| Tube OD (inch) | Wall Thickness (inch) | Working Pressure (psig) |
|---|---|---|
| 1/8" | .028 | 7900 |
| 1/8" | .035 | 10100 |
| 1/4" | .028 | 3700 |
| 1/4" | .035 | 4800 |
| 1/4" | .049 | 7000 |
| 1/4" | .065 | 9500 |
| 3/8" | .035 | 3100 |
| 3/8" | .049 | 4400 |
| 3/8" | .065 | 6100 |
| 1/2" | .049 | 2300 |
| 1/2" | .065 | 3200 |
| 1/2" | .083 | 4400 |
| 3/4" | .065 | 2200 |
| 3/4" | .083 | 3000 |
| 3/4" | .095 | 4000 |
| 3/4" | .109 | 4600 |
| 1" | .083 | 2200 |
| 1" | .095 | 2900 |
| 1" | .109 | 3400 |
| 1" | .120 | 3900 |
| 1" | .125 | 4300 |
How is Grade 1 titanium tube inspected?
| Test | Description |
|---|---|
| Chemical Analysis | Verify titanium grade 1 composition per ASTM |
| Tensile Testing | Confirm yield strength (25-45 KSI) and elongation (24% min) |
| Flattening Test | Per ASTM B338 |
| Flaring Test | Per ASTM B338 |
| Ultrasonic Testing (UT) | For seamless tubing |
| Eddy Current Testing (ET) | For welded tubing |
| Hydrostatic Test | Pressure test per standard |
| PMI Test | Confirm UNS R50250 |
What equipment is used to make Grade 1 titanium tube?
| Equipment | Capability |
|---|---|
| Cold pilger mill | Produces seamless tube with tight tolerances |
| TIG welding line | For welded tube production |
| Drawbench | Cold drawing for small diameter tubes |
| Annealing furnace | Stress relieving and recrystallization (AP/BA finishes) |
| Polishing line | Mechanical and electro polishing (MP/EP finishes) |
| U-bending machine | For 'U' shaped tubing for heat exchangers |
| Coiling line | For coiled tubing production |
| UT/ET testers | Non-destructive inspection |
| Hydrostatic tester | Pressure test |
| Cutting & threading | Value added services per customer requirements |
Stock List – Grade 1 Titanium Tube (Ready to Ship)
| Alloy | Product Form | Dimension |
|---|---|---|
| Titanium Gr.1 ASTM B338 | Tube; welded | 1.6 x 0.5 mm |
| Titanium Gr.1 ASTM B338 | Tube; welded | 2.2 x 0.3 mm |
| Titanium Gr.1 | Tube; welded, annealed | 5.0 x 0.25 mm |
| Titanium Gr.1 | Tube; seamless, annealed | 1.0 x 0.2 mm |
| Titanium Gr.1 ASTM B338 | Tube; seamless, vacuum annealed | 25.0 x 2.0 |
| Titanium Gr.1 ASTM B338 | Tube; seamless, annealed | 10.0 x 0.5 mm |
| Titanium Gr.1 ASTM B338 | Tube; welded, cold drawn, annealed | 16.0 x 0.7 mm |
| Titanium Gr.1 ASTM B861 | Tube; seamless, annealed | 21.34 x 2.11 mm (½" NB Sch10s) |
FAQ
1. What is Grade 1 titanium tube used for?
Grade 1 titanium tube is mainly used in marine and chemical industries where parts are subjected to very harsh environments. It is also used in heat exchangers, desalination units, airframes, condensers, and aerospace applications due to its excellent corrosion resistance and formability.
2. What are the equivalent grades of Grade 1 titanium tube?
UNS R50250 and Werkstoff Nr. 3.7025 are the primary equivalents. Trade names include Timetal 35A, Titan Grade 1, and Allvac 30. ASTM B338 Grade 1 and ASME SB338 Gr.1 are the standard specifications.
3. What is the difference between ASTM B338 and ASME SB338?
ASTM B338 and ASME SB338 are essentially the same technical standard. ASME SB338 is the version adopted for pressure vessel code applications. Both cover seamless and welded titanium tubes for condensers and heat exchangers.
4. What is the chemical composition of Grade 1 titanium?
Grade 1 titanium requires: carbon 0.08% max, nitrogen 0.03% max, oxygen 0.18% max, hydrogen 0.015% max, iron 0.20% max, titanium balance. Low oxygen and iron give Grade 1 its high ductility and formability.
5. What are the mechanical properties of Grade 1 titanium tube?
Ultimate tensile strength is 35 KSI min (240 MPa min). Yield strength (0.2% offset) is 25-45 KSI (170-310 MPa). Elongation is 24% minimum. Grade 1 is the softest and most ductile titanium grade.
6. What sizes are available for Grade 1 titanium tube?
Seamless tube: 3.35 mm OD to 101.6 mm OD. Welded tube: 6.35 mm OD to 152 mm OD. Wall thickness: 0.020" to 0.220". NB sizes in stock: 1/8" to 6". Custom sizes available.
7. What surface finishes are available for Grade 1 titanium tube?
Four finishes are available: AP (Annealed & Pickled), BA (Bright Annealed), MP (Mechanical Polish), and EP (Electro Polish). EP provides the smoothest ID finish at 5-15 μ inch RA.
8. What is the working pressure rating for Grade 1 titanium tube?
For 1/4" OD tube with .035" wall, working pressure is 4800 psig. For 1/2" OD tube with .065" wall, it is 3200 psig. For 1" OD tube with .120" wall, it is 3900 psig. Heavy-wall tubes resist ferrule action better than thin-wall tubes.
9. What specifications cover welded Grade 1 titanium tube?
ASTM B862 covers welded titanium tubing. ASTM B338 also covers welded tubes for heat exchangers and condensers. Welded tubes are available from 6.35 mm OD to 152 mm OD in various wall thicknesses.
10. What certifications are provided with Grade 1 titanium tube?
Manufacturer Test Certificate, Laboratory Test Certificate from Govt. Approved Lab, and Third Party Inspection reports are available. Mill Test Certificates (EN 10204 3.1) are standard.
11. Can Grade 1 titanium tube be supplied in U-bent or coiled form?
Yes. Grade 1 titanium tube is available in straight, U-bent, and coiled forms. U-bent tubes are commonly used in heat exchangers. Coiled tubing is available for various industrial applications.
