Titanium Grade 1 tubes (UNS R50250) have the highest ductility and formability of the commercially pure titanium grades. Manufactured to ASTM B338 in seamless and welded form, Grade 1 is the softest commercially pure titanium grade, with the lowest oxygen and iron limits. This makes it easier to bend, flare and expand into tube sheets compared with higher strength CP titanium grades. Amardeep Steel supplies Titanium Grade 1 tubes with EN 10204 3.1 mill test certificates and complete heat traceability. Compare our ASTM B338 Grade 2 titanium tubes, or browse our titanium pipes and tubes.
What Are Titanium Grade 1 Tubes?
Commercially pure titanium is graded by its oxygen and iron content. Grade 1 has the lowest, at 0.18% oxygen and 0.20% iron maximum, so it has the lowest strength and the highest elongation of the CP grades. It resists seawater, chlorides, oxidising acids and wet chlorine, and is non-magnetic.
When to Choose Grade 1 over Grade 2
Choose Grade 1 when the tube must be formed hard: tight U-bends, roller expansion into thin tube sheets, flaring, or explosive cladding. Where pressure rating matters more than formability, Grade 2 or Grade 3 lets you use a thinner wall.
Titanium Grade 1 Tube Specifications
Parameter | Details |
|---|---|
Grade | Titanium Grade 1 (CP Grade 1) |
UNS | R50250 |
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 1 Chemical Composition
Element | Content (%) |
|---|---|
Nitrogen (N) | 0.03 max |
Carbon (C) | 0.08 max |
Hydrogen (H) | 0.015 max |
Iron (Fe) | 0.20 max |
Oxygen (O) | 0.18 max |
Residual elements, each | 0.1 max |
Residual elements, total | 0.4 max |
Titanium (Ti) | Balance |
Titanium Grade 1 Mechanical Properties
Property (ASTM B338) | Value |
|---|---|
Tensile Strength, min | 240 MPa (35 ksi) |
Yield Strength (0.2% offset), min | 138 MPa (20 ksi) |
Elongation in 50 mm, min | 24% |
Titanium Grade 1 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 1 Equivalent Grades
Standard | Designation |
|---|---|
UNS | R50250 |
Common names | CP Titanium Grade 1, Ti Gr 1 |
Werkstoff Nr. | 3.7025 |
GB (China) | TA1 |
ASTM tube / pipe | B338 / B861 / B862 |
Titanium Grade 1 vs Grade 2 vs Grade 3
Property (ASTM B338) | Grade 1 | Grade 2 | Grade 3 |
|---|---|---|---|
Oxygen, max | 0.18% | 0.25% | 0.35% |
Iron, max | 0.20% | 0.30% | 0.30% |
Tensile strength, min | 240 MPa (35 ksi) | 345 MPa (50 ksi) | 450 MPa (65 ksi) |
Yield strength, min | 138 MPa (20 ksi) | 275 MPa (40 ksi) | 380 MPa (55 ksi) |
Elongation, min | 24% | 20% | 18% |
Formability | Highest | High | Good |
Best for | Deep forming, tight bends, explosive clad | General condenser and heat exchanger tube | Higher pressure, thinner wall |
For the most common condenser grade, see our ASTM B338 Grade 2 titanium tubes. For higher strength, see our Titanium Grade 3 tubes.
Titanium Grade 1 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.
Need Titanium Grade 1 tubes in a size or BWG not listed, or as U-bends? Send the OD, wall, length and quantity for a quote.
Applications of Titanium Grade 1 Tubes
- Condenser and heat exchanger tubes needing tight U-bends
- Plate and tube heat exchangers in chloride service
- Chlor-alkali and chemical process tubing
- Desalination and seawater cooling equipment
- Anodes and electrochemical equipment
Testing and Documentation
Every order of Titanium Grade 1 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 1, 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 1 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 1?
Titanium Grade 1 (UNS R50250) is the softest commercially pure titanium, with 0.18% oxygen and 0.20% iron maximum. It has the highest ductility of the CP grades.
What are the mechanical properties of Grade 1 titanium tube?
ASTM B338 sets 240 MPa (35 ksi) minimum tensile strength, 138 MPa (20 ksi) minimum yield strength and 24% minimum elongation for Grade 1.
What is the difference between Titanium Grade 1 and Grade 2?
Grade 1 has lower oxygen and iron, so it is softer and easier to form. Grade 2 is stronger and is the most common grade for condenser tubes. Corrosion resistance is similar.
Which standard covers Titanium Grade 1 tubes?
ASTM B338 / ASME SB338 covers seamless and welded titanium tubes for condensers and heat exchangers. ASTM B861 and B862 cover seamless and welded pipe.
