Gr7 Titanium Seamless Tube
Standard: ASTM B338 / ASME SB338,ASTM B861
Condition: Annealed
surface treatment: Polishing
Material: Ti-0.25Pd
Place of Origin: Baoji,Shaanxi,China
Testing: Ultrasonic testing and eddy current testing
Description
Technical Parameters
Products Description
Gr7 titanium is essentially pure titanium with a small addition of palladium(0.12-0.25%),which dramatically enhances its corrosion resistance,particularly in reducing acid environments.The seamless construction ensures maximum reliability and performance in the most demanding corrosive applications.This tube is most expensive tube among all the titanium tubes,but it plays an irreplaceable role in some special scenarios.
Gr7 titanium seamless tube is manufactured from ASTM B861 standard that made of Gr7 meterial(Ti-0.25Pd). It typically supplied in annealed condition.We can perform surface treating by polishing and the finished tubes under non-destrucive testing such as ultrasonic testing and eddy current testing. A titanium billet is heated and pierced to create a hollow shell, the hollow shell is further processed through hox extrusion or cold pilgering to achieve the desired dimensions and wall thickness.
Gr7 titanium seamless tube represents the highest standard for corrosion resistance titanium tubing.Its palladium-enhance composition combined with seamless construction makes it indispensable for handling the most aggressive chemicals across chemicals processing,pharmaceutical and nuclear industries.While premium-priced,it offers unmatched performance and reliability in extreme corrosive environments.
Physical properties and mechanical properties
| Property Category | Property Item | Value | ||
| Physical Properties | Density | 4.51 g/cm³ | ||
| Melting Point | 1668°C | |||
| Thermal Conductivity | 16.4 W/m·K | |||
| Modulus of Elasticity | 105 GPa | |||
| Specific Heat Capacity | 520 J/kg·K (typical) | |||
| Electrical Resistivity | 0.65 μΩ·m (typical) | |||
|
Mechanical Properties (Annealed, Room Temperature) |
Tensile Strength | ≥ 345 MPa (50 ksi) | ||
| Yield Strength (0.2% offset) | ≥ 275 MPa (40 ksi) | |||
| Elongation (50 mm gauge length) | ≥ 20% | |||
| Reduction of Area | ≥ 40% (typical) | |||
| Hardness | HB 120–160 (typical) |
Advantages about Gr7 Titanium Seamless Tube
1,Excellent Corrosion Resistance: The palladium addition provides outstanding resistance to crevice corrosion and corrosion in reducing acids,for example,sulfuric,hydrochloric and phosphoric acid.It performs excellently in oxizing environments as well
2,Excellent Fabricability: It retains the superior formability and weldability of pure titanium grades.
3,Moderate Strength: It is similar mechanical strength to grade 2 titanium but with significantly enhanced corrosion performance.
4,Biocompatibility: Highly biocompatible,suitable for medical applications requiring execptional corrosion resistance.
5,Reliability: Essential for handling hazardous and toxic chemicals.
6,No Weld Seam: Elminates potential weak points for corrosion initiation.
Applications about Gr7 Titanium Seamless Tube
1,Chemical Processing:it can be maden to heat exchangers,reactor coils and piping for concentrated sulfuric,hydrouchloric and phosphoric acid services.
2,Pharmaceutical Industry:it is used in critical process equipment requiring ultra-high purity.
3,Nuclear Fuel Processing:it is used as equipment handling corrosive nuclear materials.
4,Pollution Control:it can be maden to scrubbers and systems for aggressive emissions.
How does Gr7 compare to other Ti grades?
| Grade | Pd Content | Corrosion Resistance | Strength | Typical Use |
|---|---|---|---|---|
| Gr7 | 0.12–0.25% | Excellent (reducing/seawater) | Moderate | Heat exchangers, marine |
| Gr2 | 0% | Good (oxidizing) | Moderate | General corrosion |
| Gr12 | 0.3% Mo, 0.8% Ni | Excellent (acidic/crevice) | Moderate | Chemical processing |
fAQ about Gr7 Titanium Seamless Tube
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1. Why choose Gr7 over Gr2?
- Gr7's palladium addition drastically improves:
- Crevice corrosion resistance.
- Resistance to reducing acids and seawater.
- Longer service life in harsh environments despite higher cost.
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2. What testing is performed?NDT: Eddy current (ET), ultrasonic (UT), X-ray.
Mechanical: Flaring, flattening, tensile, hardness.
Corrosion: Boiling HCl (40%, 48 h), FeCl₃ crevice test.
Hydrostatic: Water pressure test per ASTM B338.
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3. How to weld Gr7 tubes?
- Process: GTAW (TIG) with Gr7 filler wire.
- Precautions:
- Strict oxygen/hydrogen exclusion;
- Remove Fe contamination;
- Control heat input; post-weld stress relief if needed.
Contact
Ruihang Group is a direct manufacturer, supplying titanium and titanium alloy products with more than 13 years experiences in titaniumm industry. We welcome overseas clients to discuss business opportinities for mutual success and sincerely invite international customers to visit our factory for communication.For more details,please send your inquiries to e-mail:Sam.Rui@bjrh-titanium.com
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