Titanium Bar Gr7
Titanium bar Gr7, also known as Gr7 titanium alloy bar or Ti-0.15Pd titanium alloy bar, is a titanium alloy bar with palladium as an alloying element. It is renowned for its exceptional corrosion resistance, particularly in reducing acidic environments, while also offering high strength and lightweight properties.
Gr7 titanium bars are primarily used in industrial sectors with extremely high corrosion resistance requirements, such as the chemical industry for manufacturing corrosion-resistant equipment, as well as specific corrosion-resistant components in marine engineering and the aerospace industry. Looking for high-performance titanium alloy bars? Our ASTM B348 Gr7 titanium bar is your best solution.
Chalco grade 7 titanium bar specifications standards
| ASTM B348 | ГОСТ 23755 | DIN 17851 | EN 12470 | BS 7252 |
| AMS 4928 | ВТ1-0 | ISO/TS 16949 | GB/T 39235 | GB/T 2965 |
Chalco gr7 titanium bar stock size list
| Product | Diameter (inches) | Length (inches) |
|---|---|---|
| 0.250 inch diameter 7 grade titanium bar | 0.25" | 39.37 - 236.22" |
| 0.500 inch diameter 7 grade titanium bar | 0.5" | 39.37 - 236.22" |
| 0.750 inch diameter 7 grade titanium bar | 0.75" | 39.37 - 236.22" |
| 1.000 inch diameter 7 grade titanium bar | 1" | 39.37 - 236.22" |
| 1.250 inch diameter 7 grade titanium bar | 1.25" | 39.37 - 236.22" |
| 1.500 inch diameter 7 grade titanium bar | 1.5" | 39.37 - 236.22" |
| 2.000 inch diameter 7 grade titanium bar | 2" | 39.37 - 236.22" |
| 2.500 inch diameter 7 grade titanium bar | 2.5" | 39.37 - 236.22" |
| 3.000 inch diameter 7 grade titanium bar | 3" | 39.37 - 236.22" |
| 3.500 inch diameter 7 grade titanium bar | 3.5" | 39.37 - 236.22" |
| 4.000 inch diameter 7 grade titanium bar | 4" | 39.37 - 236.22" |
| 5.000 inch diameter 7 grade titanium bar | 5" | 39.37 - 236.22" |
| 6.000 inch diameter 7 grade titanium bar | 6" | 39.37 - 236.22" |
| 8.000 inch diameter 7 grade titanium bar | 8" | 39.37 - 236.22" |
| 10.000 inch diameter 7 grade titanium bar | 10" | 39.37 - 236.22" |
| 12.000 inch diameter 7 grade titanium bar | 12" | 39.37 - 236.22" |
Chalco offers Grade 7 Titanium Rods in a variety of stock sizes, ranging from 0.250" to 12.000" in diameter. These rods can be custom cut to lengths between 1 meter (39.37") and 6 meters (236.22") in length. If the dimensions above do not match your needs, please contact us.
Popular titanium bar types from Chalco
Gr7 titanium round bar
Features: The most common shape with a circular cross-section, easy to machine into various components, and capable of withstanding forces from all directions.
Applications: Used in chemical equipment for shafts, agitator shafts, fasteners, valve stems, pump shafts, etc. Leveraging Gr7's corrosion resistance, it ensures long-term stability in corrosive media.
Gr7 titanium square bar
Features: Square cross-section provides flat surfaces for easy connection and fixation, offering good strength and stability.
Applications: Used in chemical equipment for frame structures, supports, guide rails, and sliders. Provides structural support and guidance in corrosive environments.
Gr7 titanium flat/rectangular bar
Features: Rectangular cross-section with one wide and one narrow side, providing a larger surface area, making it suitable for connections and bending load resistance.
Applications: heat exchangers, support plates, flanges, and reinforcement ribs in vessels. Leveraging Gr7's corrosion resistance, it is important in heat exchange and structural support.
Gr7 titanium hexagonal bar
Features: Hexagonal cross-section allows easy gripping with wrenches and other tools, commonly used for manufacturing bolts, nuts, and other fasteners.
Application: Corrosion-resistant fasteners for connecting chemical equipment, marine engineering structures, etc., ensuring reliable connections and corrosion resistance.
Chemical composition of Gr7 titanium bar
| Element | Composition (%) | Source |
|---|---|---|
| Titanium (Ti) | Balance | ASTM B348 |
| Palladium (Pd) | 0.12 - 0.25 | ASTM B348 |
| Iron (Fe) | ≤ 0.30 | ASTM B348 |
| Oxygen (O) | ≤ 0.25 | ASTM B348 |
| Carbon (C) | ≤ 0.08 | ASTM B348 |
| Nitrogen (N) | ≤ 0.05 | ASTM B348 |
| Hydrogen (H) | ≤ 0.015 | ASTM B348 |
| Other (each) | ≤ 0.1 | ASTM B348 |
| Other (total) | ≤ 0.4 | ASTM B348 |
Core features of Gr7 titanium bar
Exceptional corrosion resistance: This is the most prominent feature of Gr7, especially in reducing acidic environments such as hydrochloric and sulfuric acid, where its corrosion resistance far exceeds that of pure titanium and other common titanium alloys.
High strength: Despite its excellent corrosion resistance, Gr7 titanium alloy retains the high strength characteristics of titanium alloys, meeting the strength requirements of various industrial applications.
Lightweight: As a member of the titanium alloy family, Gr7 inherits titanium’s lightweight properties, reducing structural weight while maintaining performance.
Good weldability: Gr7 titanium alloy offers excellent weldability, making it easy to process and manufacture complex structural components.
Higher cost: Due to the scarcity and price of palladium, Gr7 titanium alloy has a relatively high cost. Therefore, material selection should consider both performance and cost. However, for applications requiring extreme corrosion resistance, Gr7 remains a highly cost-effective choice.
Mechanical properties of Gr7 titanium bar
| Property | Value (Minimum) | Source |
|---|---|---|
| Tensile Strength | 550 MPa | ASTM B348 |
| Yield Strength | 483 MPa | ASTM B348 |
| Elongation | 20% | ASTM B348 |
| Reduction of Area | 30% | ASTM B348 |
Strength: High tensile and yield strength ensure that Gr7 titanium bar does not easily break or deform under load-bearing applications, such as in aerospace structural components and chemical equipment.
Ductility: Excellent elongation and reduction of area indicate good toughness, allowing the material to absorb impact energy and reduce the risk of brittle fracture, which is crucial for safe and reliable applications.
Applications of Gr7 titanium bar in different industries
Chemical Processing Industry
Reactors: Various types of reaction kettles, such as titanium lining modifications for stainless steel reactors.
Heat exchangers: Plate heat exchangers, shell-and-tube heat exchangers, etc.
Evaporators & condensers: Used for the evaporation and condensation of corrosive materials.
Storage tanks & vessels: Used for storing corrosive chemicals.
Piping systems: Pipelines for transporting corrosive media such as acids, alkalis, and salts.
Aerospace Industry
Aircraft structural components: Fuselage frames, wing spars, landing gear parts, etc. (Although Gr7 is not as strong as high-strength titanium alloys, it may be used in areas requiring higher corrosion resistance.)
Engine components: Compressor blades, fan blades, combustion chamber parts, etc. (Gr7 may be used for components with certain corrosion resistance requirements.)
Fasteners: Bolts, nuts, rivets, etc., for connecting aircraft structures.
Hydraulic tubing: Hydraulic system pipelines in aircraft.
Marine Engineering Industry
Offshore platform structures: Platform frames, support structures, etc.
Desalination equipment: Evaporators, condensers, pipelines, etc.
Ship components: Hull shells, propeller shafts, seawater cooling systems, etc.
Gr7 titanium bar vs. Gr5 titanium bar
| Property | Gr7 Titanium Bar (Ti-0.15Pd) | Gr5 Titanium Bar (Ti-6Al-4V) |
|---|---|---|
| Main Composition | Pure titanium + 0.12-0.25% Palladium (Pd) | Titanium + 6% Aluminum (Al) + 4% Vanadium (V) |
| Core Features | Excellent corrosion resistance (especially in reducing acidic environments) | High strength (extremely high strength-to-weight ratio) |
| Corrosion Resistance | Excellent, especially in reducing acidic media, superior to Gr5 and pure titanium | Good, but not as good as Gr7, performs better in oxidizing environments, prone to crevice corrosion |
| Strength | Medium strength, higher than pure titanium but lower than Gr5 | Very high strength, most commonly used high-strength titanium alloy |
| Weldability | Good | Good |
| Typical Applications | Chemical equipment (reactors, pipes, etc.), marine engineering, aerospace (specific corrosion-resistant components) | Aerospace structural parts (aircraft fuselage, engine components), medical implants, sports equipment, automotive parts, etc. |
| Cost | Higher (due to palladium being a precious metal) | Relatively lower (compared to Gr7) |
When the application environment is highly corrosive, especially in reducing acidic conditions, and requires exceptional corrosion resistance, Gr7 titanium bar is the ideal choice.
When the application requires extremely high strength and the highest strength-to-weight ratio, while corrosion resistance is a secondary concern, Gr5 titanium bar is a more economical and high-performance choice.
Processing technology of Gr7 titanium bar
Hot processing
At high temperatures, the ingot undergoes plastic deformation, altering its shape and size while improving its internal structure.
Forging: Open die forging (Open Die Forging): Suitable for rough processing of large bars and irregularly shaped parts, it can change the shape of the ingot, break the as-cast structure, and improve mechanical properties.
Closed die forging: Suitable for mass production of bars with complex shapes and high dimensional accuracy requirements, it can improve production efficiency and material utilization.
Hot rolling: The ingot or forged billet is rolled through rollers at high temperatures to obtain bars of the desired diameter. Hot rolling can further refine the grain structure and enhance mechanical properties.
Cold rolling: Rolling at room temperature, mainly to improve dimensional accuracy, surface finish, and strength of the bars. Cold rolling is usually performed after hot rolling.
Extrusion: The bar billet is placed into an extrusion chamber and shaped through a die. Extrusion is suitable for producing long bars with complex cross-sectional shapes, but rolling and forging are more common for Gr7 titanium bars.
Heat treatment
By heating, holding, and cooling, the microstructure of the titanium bar is altered, internal stress is eliminated, and mechanical properties and workability are improved.
Annealing: A commonly used heat treatment method to eliminate internal stress generated during processing, reduce hardness, improve plasticity and toughness, and enhance machinability. Gr7 titanium bars typically undergo vacuum annealing or protective atmosphere annealing to prevent oxidation.
Solution treatment: For certain alloyed titanium alloys, solution aging treatment may be used to further enhance strength, but Gr7 titanium alloy usually does not require this and primarily relies on annealing to meet performance requirements.
Machining
Machining is the process of further processing the hot-worked titanium bar into a finished product that meets the final dimensional and surface quality requirements through cutting, grinding, and other methods.
Turning: Used for machining cylindrical outer surfaces, inner holes, end faces, threads, etc.
Milling: Used for machining planes, curved surfaces, grooves, gears, and other complex shapes.
Drilling: Used for machining holes in bars.
Grinding: Used to improve dimensional accuracy and surface finish of bars.
Wire EDM: Suitable for machining complex shapes and high-precision parts.
Surface treatment
According to application requirements, Gr7 titanium bars can undergo surface treatment to enhance wear resistance, corrosion resistance, or aesthetics.
Pickling: Removes oxidation layers and contaminants from the surface of titanium bars, improving surface cleanliness.
Sandblasting or shot peening: Improves surface roughness, enhances surface hardness, and increases fatigue strength.
Anodizing: Forms an oxide layer on the titanium bar surface, improving wear and corrosion resistance, and allowing for coloration.
Quality control
Quality inspection runs through the entire production and processing process to ensure that Gr7 titanium bars meet standards and customer requirements.
Chemical composition analysis: Tests whether the alloy composition meets Gr7 standards.
Mechanical property testing: Measures tensile strength, yield strength, elongation, hardness, and other mechanical properties.
Metallographic examination: Analyzes the microstructure of the alloy, evaluating grain size, phase composition, etc.
Non-destructive testing (NDT): Includes ultrasonic testing, eddy current testing, and penetrant testing to detect internal and surface defects such as cracks, pores, and inclusions.
Dimension and surface quality inspection: Checks whether the dimensions, shape, and surface finish of the bars meet the required specifications.
Gr7 titanium bar FAQs
What is the difference between Gr7 titanium bars and pure titanium?
Gr7 titanium bars contain palladium, which significantly enhances corrosion resistance, especially in acidic and chloride environments.
What welding processes are suitable for Gr7 titanium bars?
Commonly used with argon arc welding, ensuring proper gas shielding and weld seam cleanliness.
What factors affect the price of Gr7 titanium bars?
Raw material costs, processing techniques, specifications, order quantity, market supply and demand, and quality grade.
Is there a minimum order quantity for Gr7 titanium bars?
Standard sizes have flexible minimum order quantities, while special or customized products require higher minimum orders. Delivery time depends on order type and quantity.
How is the quality of Gr7 titanium bars ensured?
Strict material selection, precise manufacturing processes, advanced testing equipment, and ISO 9001 certification. Documents include material certificates, third-party inspection reports, and certificates of origin.
