Grade 7 Titanium Bar
standard: ASTM B348
chemical composition: Ti0.12%~0.25%Pd
Excellent anti-corrosion performance.
Product Introduction
1. Overview
Grade 7 titanium is an α-phase titanium alloy containing 0.12–0.25 % palladium (Pd).
The addition of palladium significantly enhances the alloy's resistance to strong oxidizing and reducing acids, especially hydrochloric acid (HCl) and sulfuric acid (H₂SO₄).
Compared with Grade 2, Grade 5, and Grade 9 titanium alloys, Grade 7 offers superior corrosion resistance, making it one of the most widely used titanium materials in the chemical processing industry.
International Designations:
Germany: W.Nr 3.7235
China: TA9
Standard: ASTM B348
Density: 4.51 g/cm³ (0.163 lb/in³)
Surface Finish: Polished or pickled
Test: Ultrasonic inspection before delivery
Packaging: Wooden case
Available Sizes: Diameter Ø 1.0 – 400 mm × Length (customized)
2. Chemical Composition (%)
| Element | N | C | H | Fe | O | Al | V | Pd | Mo | Ni | Ti |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Grade 7 | ≤ 0.03 | ≤ 0.08 | ≤ 0.015 | ≤ 0.30 | ≤ 0.25 | - | - | 0.12 – 0.25 | - | - | Balance |
3. Mechanical Properties
| Property | Imperial | Metric | Typical Value |
|---|---|---|---|
| Tensile Strength (min) | 50 ksi | 345 MPa | 50–65 ksi (345–448 MPa) |
| Yield Strength (min) | 40 ksi | 275 MPa | - |
| Elongation (min) | 20 % | 20 % | - |
| Annealing Temperature | 1290 °F | 700 °C | - |
| Operating Temperature Range | –300 °F to 1000 °F | –184 °C to 540 °C | - |
4. Physical Properties
| Property | Value | Unit |
|---|---|---|
| Density | 0.163 | lb/in³ (4.51 g/cm³) |
| Elastic Modulus (E) | 16.3 × 10³ ksi | 112 GPa |
| Shear Modulus (G) | 5.9 × 10³ ksi | 41 GPa |
| Coefficient of Thermal Expansion | 5.4 µin/in · °F (70 – 932 °F) | 9.7 µm/m · °C (20 – 500 °C) |
| Electrical Resistivity | 21 µΩ·in | 53.3 µΩ·cm |
| Thermal Conductivity | 12.6 Btu · in/ft² · hr · °F | 21.8 W/m · K |
5. Corrosion Resistance
Grade 7 titanium provides excellent corrosion resistance in:
Oxidizing and reducing acids (e.g., HCl, H₂SO₄)
Brine and chloride media
Wet chlorine gas and hypochlorite solutions
Seawater and marine atmospheres
The small Pd addition promotes spontaneous passivation and rapid re-passivation, even in low-oxygen environments.
6. Typical Applications
Grade 7 titanium bars are widely used in the chemical, marine, and energy industries for components exposed to aggressive corrosive conditions:
Pickling Tanks – Excellent resistance to strong acids extends service life in acid cleaning systems.
Flue Gas Desulfurization (FGD) Systems – Used for desulfurization towers and ducting due to strong acid and oxidant resistance.
Distillation Towers – Lightweight and corrosion-resistant, reducing tower dead weight and improving stability.
Reactors and Pressure Vessels – Resistant to strong acids, alkalis, and high temperatures, ensuring long operational life.
Heat Exchangers and Condensers – Stable performance in chloride-rich cooling environments.
Pumps, Valves, and Piping Systems – Excellent material for components handling corrosive process fluids.
Electrolyzers and Centrifuges – High stability in electrochemical and separation equipment.
7. Advantages
Outstanding corrosion resistance in most chemical media
High strength-to-weight ratio
Excellent weldability and formability
Low maintenance cost and long service life
Stable mechanical properties at elevated temperatures
8. Summary of Specifications
| Item | Specification |
|---|---|
| Standard | ASTM B348 |
| Designation | Ti–0.15 Pd |
| Grade Number | Grade 7 |
| W.Nr. | 3.7235 |
| Chinese Grade | TA9 |
| Size Range | Ø 1.0 – 400 mm × Custom Length |
| Surface Finish | Polished / Pickled |
| Inspection | Ultrasonic Testing (UT) |
| Packaging | Export Wooden Case |
Hot Tags:
You Might Also Like
Send Inquiry
