GR2 Titanium Tube
Products Description
GR2 Titanium Tube refers to ASTM B338 Grade 2 commercially pure seamless titanium tube.Grade 2 is the most widely used pure titanium material with a single-phase alpha microstructure. It features excellent ductility, moderate strength and superior corrosion resistance, different from titanium alloy Grade 5 (TC4). The standard ASTM B338 specifies titanium tubes for heat exchangers and fluid transmission.
Production Process
Raw Material Inspection
Check GR2 titanium billets, test chemical composition, surface defects and dimensional tolerance to meet ASTM B338 standards.
Heating & Piercing
Heat solid titanium round billet to uniform forming temperature, then pierce into hollow tube blank via cross rolling mill.
Cold Rolling / Cold Drawing
Multi-pass cold rolling and cold drawing to precisely control outer diameter, wall thickness and smooth inner/outer surface. Smaller precision tubes adopt multiple drawing passes.
Intermediate Pickling
Remove oxide scales and cold working stress layers with mixed acid cleaning after each forming pass.
Vacuum Annealing (Critical Step for GR2)
Conduct high-temperature vacuum annealing without air contact to eliminate work hardening, restore ductility and stable single α-phase structure. No oxidation on tube surface.
Straightening & Cutting
Straighten bent tubes to straightness tolerance, cut into customer required fixed lengths and deburr pipe ends.
Final Surface Treatment
Pickling for matte standard finish; optional mechanical polishing for mirror bright surface upon request.
Strict Quality Inspection
Dimensional measurement (OD, wall thickness, length)
PMI chemical composition test
Hydrostatic pressure / eddy current non-destructive test
Surface visual inspection for cracks, scratches, pits
Hardness & tensile mechanical sampling test
Marking & Packing
Mark heat number, grade, size, standard on each tube; use moisture-proof packaging with plastic caps for pipe ends, wooden cases/pallets for sea transportation.
Product Specifications & Technical Data
| Specification | Details |
|---|---|
| Material Grade | Titanium Grade 2 (Gr2), UNS R50400 |
| Standard | ASTM B338, ASME SB338 |
| Chemical Composition | Ti (Balance), Fe ≤ 0.30%, O ≤ 0.25%, C ≤ 0.10%, N ≤ 0.03%, H ≤ 0.015% |
| Mechanical Properties | Tensile Strength ≥ 345 MPa, Yield Strength ≥ 275 MPa, Elongation ≥ 20% |
| Available Outer Diameter (OD) | 3 mm - 100 mm (Custom sizes available) |
| Available Wall Thickness | 0.5 mm - 10 mm (Custom sizes available) |
| Length | Cut-to-length, standard up to 6 meters, or as per drawing |
| Condition | Annealed (ASTM B338) |
| Surface Finish | Pickled, Bright, or CF (Coil Finished) |
Precautions
Processing Temperature: During hot working, the temperature must be controlled between 850-950°C to avoid overheating and grain coarsening.
Surface Protection: Passivation treatment is required after cutting to prevent the oxide layer from affecting corrosion resistance.
Material Compatibility: When used with grades such as TC4 and TC6, the risk of electrochemical corrosion should be assessed. We now offer GR2 titanium tube, made from an α+β titanium alloy, which offers strong corrosion resistance and high specific strength. Custom processing and surface finishing are available. Please contact us for more information and to provide you with the best solution.
Products Applications
Aerospace
Hydraulic and pneumatic system tubing, engine components, airframe structures, and landing gear parts.
Marine & Offshore
Heat exchanger tubes for desalination plants, shipboard piping systems, offshore platform components.
Chemical Processing
Heat exchangers, condensers, reactor vessels, and process piping for the chlor-alkali industry.
Medical & Pharmaceutical
Surgical implants (bone plates, screws), wheelchair frames, surgical instruments, pharmaceutical processing equipment.
Our Services
Deep Processing Capacity
Custom cutting, bending, U-tube forming, end beveling, polishing and pipe prefabrication as drawings.
Technical Support
Free material selection advice; supply full test reports & MTC certificates; cutting, bending and welding technical guidance.
After-sales Warranty
Guaranteed material composition & dimension; free replacement for unqualified goods within 7 days after receiving; full batch traceability.
Lead Time
10–15 days for standard pipes; 15–25 days for deep-processed customized pipes.
Frequently Asked Questions
What standard does GR2 Titanium Tube follow?
ASTM B338, the standard for seamless titanium heat exchanger & condenser tubes. GR2 is commercially pure titanium (CP Ti).
What is the difference between GR2 titanium tube and 316L stainless steel tube?
GR2 titanium is lighter, far more resistant to seawater/chloride corrosion, non-toxic and non-magnetic. Its production needs vacuum melting and vacuum annealing with strict control of O/N/H impurities, leading to higher cost. 316L has lower anti-chloride performance, heavier weight but lower price and simpler manufacturing process.
Can GR2 titanium tube be bent into U-tubes for heat exchangers?
Yes. GR2 has excellent ductility after vacuum annealing. We provide customized U-tube deep processing.
What's the maximum continuous service temperature of GR2 titanium tube?
-200°C ~ 315°C. Long-term use over 315°C will cause material oxidation and performance degradation.
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