Products Features
Excellent resistance to corrosion by reducing acids
The core advantage of Gr7 (TA9) lies in the addition of palladium. Introducing 0.12%–0.25% palladium (Pd) into industrial pure titanium (Gr2) significantly enhances its corrosion resistance in reducing acid media. In non-oxidizing acids such as hydrochloric acid (HCl), sulfuric acid (H₂SO₄), formic acid, oxalic acid, and citric acid, the corrosion rate of Gr7 is much lower than that of industrial pure titanium. It can even replace more expensive zirconium or nickel-based alloys under certain concentration and temperature conditions. This property makes it an ideal material for handling corrosive media in fields such as chemical engineering, pharmaceuticals, and hydrometallurgy.
Excellent resistance to crevice corrosion and pitting corrosion
Gr7 (TA9) exhibits excellent resistance to crevice corrosion and pitting in high-temperature chloride solutions such as seawater, brine, and brackish water. The addition of palladium lowers titanium's passivation potential in chloride media, allowing the material to maintain a stable passive state even in high-temperature, high-chloride environments. This property makes it an irreplaceable choice for applications long exposed to highly corrosive media, including desalination equipment, chlor-alkali industry processes, and marine engineering heat exchangers.
Good machining and welding properties
Gr7 (TA9) retains the excellent cold and hot working properties and welding performance of industrial pure titanium. It can undergo forming processes such as forging, rolling, stamping, and bending, and can be welded using various methods including TIG (Tungsten Inert Gas) welding, MIG (Metal Inert Gas) welding, plasma welding, electron beam welding, and resistance welding. The corrosion resistance of the welded joint is basically consistent with that of the base material. It is suitable for manufacturing complex corrosion-resistant equipment and large chemical containers.
Long-term stable service life
Gr7 (TA9) exhibits an extremely high corrosion margin in harsh corrosive environments, significantly extending equipment service life and reducing maintenance and replacement frequency. In industries such as chemical processing, seawater desalination, and pharmaceuticals, downtime losses caused by equipment failure due to corrosion often far exceed the cost of the materials themselves. Gr7 provides customers with long-term stable production assurance at a lower total lifecycle cost.
Technical Specifications
Chemical Composition
|
Element |
Standard Requirements (ASTM B348 / ASME SB-348) |
Notes |
|
Ti |
Remaining quantity |
Matrix element |
|
Pd |
0.12 – 0.25% |
Core alloying elements that significantly improve corrosion resistance |
|
Fe |
≤ 0.30% |
Strict control |
|
O |
≤ 0.25% |
Intercalation elements, which affect ductility and corrosion resistance |
|
C |
≤ 0.08% |
Impurity elements |
|
N |
≤ 0.03% |
Strict control |
|
H |
≤ 0.015% |
Prevent hydrogen embrittlement |
Physical Properties
|
Property |
Value/Range |
Test Conditions |
|
Density |
4.51 g/cm³ |
Room Temperature (20°C) |
|
Melting Point |
≈ 1660°C |
- |
|
Thermal Conductivity |
≈ 16.0 W/(m·K) |
Room Temperature |
|
Resistivity |
≈ 0.56 μΩ·m |
Room Temperature |
|
Coefficient of thermal expansion (20–100°C) |
9.0 × 10⁻⁶ /K |
- |
|
Elastic modulus (Young's modulus) |
≈ 105 GPa |
Room Temperature |
|
Poisson's ratio |
≈ 0.34 |
Room Temperature |
Mechanical Properties (Annealed Condition, Typical Values)
|
Property |
Typical Value |
Specification |
|
Tensile Strength |
≥ 310 MPa |
ASTM B348 |
|
Yield Strength (0.2% Offset) |
≥ 170 MPa |
ASTM B348 |
|
Elongation (4D) |
≥ 30% |
ASTM B348 |
|
Reduction of cross-sectional area |
≥ 50% |
- |
|
Hardness |
≈ 85 HRB |
- |
Corrosion Resistance (Typical Value)
|
Medium |
Concentration |
Temperature |
Corrosion rate (mm/year) |
Grade |
|
Hydrochloric acid (HCl) |
10% |
Boiling Point |
< 0.1 |
Excellent |
|
Hydrochloric acid (HCl) |
5% |
Boiling Point |
< 0.05 |
Excellent |
|
Sulfuric acid (H₂SO₄) |
20% |
Room Temperature |
< 0.1 |
Excellent |
|
Sulfuric acid (H₂SO₄) |
5% |
Boiling Point |
< 0.05 |
Excellent |
|
Formic acid |
50% |
Boiling Point |
< 0.1 |
Excellent |
|
Oxalic acid |
10% |
Boiling Point |
< 0.1 |
Excellent |
|
Sodium chloride solution (brine) |
3.5% |
100°C |
< 0.01 |
Excellent |
|
Seawater |
- |
High Temperature |
Ignorable |
Excellent |
High-temperature performance
Gr7 (TA9) exhibits stable mechanical properties within the moderate temperature range:
|
Temperature |
Tensile Strength (MPa) |
Note |
|
Room Temperature |
≥ 310 |
- |
|
100°C |
≈ 275 |
Performance retention rate > 88% |
|
200°C |
≈ 245 |
Performance retention rate > 79% |
|
300°C |
≈ 210 |
Performance retention rate > 67% |
High-temperature mechanical property retention
Gr7 (TA9) maintains good corrosion resistance in high-temperature (≥ 200°C) chloride solutions and reducing acids, making it an ideal material choice for high-temperature corrosive environments such as high-temperature heat exchangers, deep well pipelines, and geothermal equipment.
Organizational stability
Gr7 is an alpha titanium alloy. It has no risk of phase transformation within conventional service temperature ranges, maintains stable microstructure, and does not suffer from the heat treatment strengthening phase transformation sensitivity issues that beta titanium alloys do. This results in high performance consistency during long-term service.
Applicable Media
1. Hydrochloric Acid (HCl) - Concentration ≤ 10%, below boiling point
2. Sulfuric Acid (H₂SO₄) - Low concentration, at room temperature to moderate temperature
3. Organic acids such as formic acid, oxalic acid, citric acid, and lactic acid
4. High-temperature seawater, brine, and brine (chloride solutions)
5. Hypochlorites and chlor-alkali solutions
6. Wet chlorine gas (containing water)
7. Oxidizing acids such as nitric acid (limited to low concentration)
Note: Gr7 is not applicable to strongly oxidizing media such as dry chlorine gas and fuming nitric acid, nor to media that can dissolve titanium substrates such as hydrofluoric acid (HF).
Gr7 (TA9, Ti-0.15Pd) is designed for harsh corrosion environments and is recommended for use in the following areas:
Application Fields
-
Chemical and Petrochemical Engineering
Heat exchangers, condensers, reactors, evaporators, absorbers, piping systems, pumps and valves, agitators, fasteners. Typical media: hydrochloric acid, sulfuric acid (low concentration), formic acid, acetic acid, chlor-alkali solutions. -
Desalination and Marine Engineering
Seawater heat exchangers, multi-stage flash (MSF) units, low-temperature multi-effect (MED) units, seawater piping systems, seawater pumps, heat exchanger tubes. -
Chlor-Alkali Industry
Ion membrane electrolyzer components, wet chlorine coolers, chlor-alkali heat exchangers, anode assemblies, piping systems. -
Pharmaceutical and Fine Chemicals
Pharmaceutical reactors, high-purity chemical equipment, dye intermediate production equipment, organic acid processing equipment. -
Hydrometallurgy
Solvent extraction and electrowinning equipment for metals such as copper, nickel, and cobalt, high-pressure acid leaching (HPAL) piping, pulp heat exchangers. -
Environmental Protection and Waste Treatment
Exhaust gas scrubbers, wastewater treatment equipment, flue gas desulfurization (FGD) systems, waste incineration exhaust gas treatment equipment. -
Aerospace and Military
Aircraft hydraulic lines, corrosion-resistant components of engine nacelles, shipboard seawater systems, structural components of deep-sea equipment.
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive Gr7 (TA9) materials that perfectly match your project requirements.
|
Form |
 Sheet/Plate
|
 Bar/Rod
|
 Pipe / Tube
|
 Strip/Sheet Coil
|
 Wire/Wire Rod
|
|---|---|---|---|---|---|
|
Conventional Range |
Thickness: 0.5 - 100 mm |
Diameter Φ6-500mm |
Outer diameter Φ10-300mm |
Thickness: 0.05 – 3.0 mm |
Diameter Φ0.1-10mm |
|
Customization Capability |
Hot-rolled or cold-rolled plates, ultra-thin sheets (starting from 0.1mm), stamped parts, and cut-to-length cutting |
Forged bars, hot-rolled bars, polished bars, and shaped bars |
Seamless pipes, welded pipes, fixed-length cutting |
Precision strip materials, stamping coil stock, laminated blanking, non-standard width |
Precision drawing, welding filler wire, special surface treatment |
Why Choose Us? - Reliable Engineering Technology. Dependable Delivery.
We are not just a supplier, but a trusted materials partner for you in China.
Vertically Integrated Production
Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.
Strict Quality Control at Every Stage
Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment.
Reliable Delivery & Export Packaging
10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.
Sample Validation Before Mass Production
We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.
FAQ
Q: What is the difference between Gr7 (TA9) and Gr2 (TA2)?
Q: What is the difference between Gr7 (TA9) and Gr12 (TA10)?
Q: What is the mechanism by which the palladium content in Gr7 (TA9) affects its corrosion resistance?
Q: What is the maximum usage temperature for Gr7?
Q: What is the welding performance of Gr7?
Q: Can Gr7 replace nickel-based alloys (such as Hastelloy C-276)?
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