1. What is titanium grade 7 tube?
Titanium grade 7 tube is a type of titanium alloy tube that is composed of 0.2% palladium and 0.15% ruthenium. It is a medium strength grade with excellent corrosion resistance and is often used in chemical processing and marine applications. The addition of palladium improves its resistance to crevice cracking, while the addition of ruthenium enhances its overall corrosion resistance. The tube is typically available in various sizes and thicknesses to accommodate different application specifications.
2. What are the properties of titanium grade 7 tube?
The properties of Titanium Grade 7 Tube include high strength, excellent corrosion resistance, good weldability, and ductility. It has a low density of 4.51 g/cm3, which is about 60% that of steel, and a high melting point of 1,668°C. It is also biocompatible and non-toxic, making it ideal for medical and dental applications.
3. What is the chemical composition of titanium grade 7 tube?
Titanium grade 7 tube is made from the Ti-0.15Pd alloy, which contains the following chemical composition:
– Titanium: 99.2% min
– Palladium: 0.12-0.25%
– Iron: 0.30% max
– Carbon: 0.08% max
– Nitrogen: 0.03% max
– Hydrogen: 0.015% max
– Others: 0.40% max
4. What are the applications of titanium grade 7 tube?
Titanium Grade 7 Tube finds extensive use in highly corrosive environments such as chemical processing plants, desalination plants, and offshore oil and gas drilling rigs. It is also used in the aerospace industry for its high strength-to-weight ratio, and in medical implants and instruments due to its excellent biocompatibility.
5. What is the difference between titanium grade 7 and grade 5 tube?
While both Grade 7 and Grade 5 titanium are strong and corrosion-resistant, they differ in their composition and applications. Titanium Grade 5, also known as Ti6Al4V, contains 6% aluminum and 4% vanadium and is widely used in the aerospace and medical industries. Titanium Grade 7, on the other hand, contains 0.2-0.4% palladium and is preferred for its high corrosion resistance.
6. What are the benefits of using titanium grade 7 tube?
The benefits of using Titanium Grade 7 Tube include:
– High strength-to-weight ratio: It is about 60% lighter than steel, making it ideal for use in applications where weight is a critical factor.
– Corrosion resistance: It is highly resistant to corrosion, even in highly acidic and corrosive environments.
– Biocompatibility: It is non-toxic and biocompatible, making it ideal for use in medical implants and instruments.
– Ductility and weldability: It can be easily formed and welded into complex shapes without losing its strength and metallurgical properties.
7. What are the limitations of titanium grade 7 tube?
Cost: Titanium grade 7 tube is more expensive than other metals and alloys commonly used in industrial applications. This can make it difficult to justify its use in certain applications.
Availability: The availability of titanium grade 7 tube may be limited compared to other materials, which can make it difficult to source in certain regions or for certain applications.
Machinability: Titanium grade 7 tube is difficult to machine, which increases the cost and time required to manufacture parts from this material.
Corrosion: While titanium grade 7 tube is generally considered corrosion-resistant, it may still be susceptible to certain types of corrosion in certain environments.
Strength: Titanium grade 7 tube has lower strength than some other titanium alloys, which may limit its suitability for applications where high strength is required.
Weldability: Titanium grade 7 tube is difficult to weld compared to other metals, which may limit its suitability for certain applications.
8. What is the manufacturing process of titanium grade 7 tube?
The manufacturing process of titanium grade 7 tube involves the following steps:
Melting：The first step in manufacturing titanium grade 7 tube is melting. pure titanium sponge, is melted in an electric arc furnace at temperatures exceeding 3,000 degrees Fahrenheit. The melted titanium is then poured into a water-cooled mold or a plasma water reactor.
Cast and Form: Once the alloy has melted, it goes through a process known as casting, where it is poured into a mold to cool and solidify. After solidification, the titanium alloy is then formed into a tube shape by extrusion or rolling.This process involves pulling the titanium tube through a series of dies, reducing its diameter and wall thickness. Cold drawing also improves the tube’s surface finish and strength.
Machining: The next step in the process is machining, where the tube is cut to the desired length and diameter. Machining may be done using cutting tools, drilling, or other methods.
Heat Treatment: After machining, the titanium grade 7 tube is heat-treated to improve its structural properties. Heat treatment may involve annealing, solution treating, or aging, depending on the desired mechanical properties of the finished tube.
Straightening and Cutting：Once the titanium tube has been cold-drawn, it is straightened and cut to the desired lengths. The tube is inspected at this stage to ensure that it meets the required specifications.
Final Inspection and Quality Control：The final step in the manufacturing process of titanium grade 7 tube is to subject it to a rigorous quality control process. The tube is inspected for various quality parameters such as diameter, wall thickness, surface finish, and mechanical properties. The tube is tested to ensure that it meets the required industry standards and customer requirements.
In conclusion, the manufacturing process of titanium grade 7 tube involves a series of steps designed to produce a high-quality product. The process involves melting, billet preparation, extrusion, heat treatment, cold drawing, straightening, cutting, and final inspection. Each step is critical in ensuring that the titanium tube meets the required specifications and industry standards.
9. What are the common sizes of Titanium Grade 7 Tube?
Titanium Grade 7 Tube is available in a range of sizes, thicknesses, and lengths to suit different applications. The most common sizes include:
– Outer diameter: 1/8″ to 6″
– Wall thickness: 0.016″ to 0.365″
– Length: 20′ to 24′
10. What is the cost of Titanium Grade 7 Tube?
The cost of Titanium Grade 7 Tube varies depending on the size, thickness, and quantity required. As of 2023, the price of Grade 7 titanium ranges from $20 to $30 per kg, making it one of the more expensive titanium alloys. However, its high strength and excellent corrosion resistance make it cost-effective in applications where other materials would fail.
11. What are the tolerances for titanium grade 7 tube?
The tolerance for titanium grade 7 tubes varies depending on the specific dimensions, shape, and application of the tube. However, general tolerances for titanium grade 7 tubes typically include:
– Outer diameter (OD): +/- 0.005-0.010 inches
– Inner diameter (ID): +/- 0.005-0.010 inches
– Wall thickness: +/- 10% of specified thickness
– Length: +/- 0.125-0.250 inches
These tolerances may be tighter or looser depending on the manufacturer and the intended use of the grade 7 titanium tubing. Be sure to check with our sales staff to ensure that the tolerances meet the specific requirements of your application.
12. What are the surface finishes available for titanium grade 7 tube?
Some common surface finishes available for titanium grade 7 tubes include:
1. Polished finish: This is a smooth, shiny finish achieved by polishing the titanium tube with abrasive materials.
2. Brushed finish: This finish is achieved by brushing the titanium tube with a wire brush, resulting in a textured, matte surface.
3. Satin finish: A satin finish is achieved by using abrasive pads or sandpaper to create a soft, brushed finish.
4. Sandblasted finish: This finish is created by blasting the titanium tube with small particles of sand or other abrasive materials, resulting in a rough, textured surface.
5. Anodized finish: Anodizing is an electrolytic process that creates a durable, corrosion-resistant surface finish by growing an oxide layer on the surface of the titanium tube.
6. Passivated finish: This process treats the surface of the titanium tube with nitric or citric acid, resulting in a clean, smooth surface that is free of impurities and contaminants.
13. What are the quality standards for titanium grade 7 tube?
The quality standards for titanium grade 7 tube include the following:
1. Chemical composition: Titanium grade 7 tube must meet the specified chemical composition requirements, including the percentage of titanium, carbon, nitrogen, oxygen, hydrogen, and iron, among others.
2. Mechanical properties: The tube must have a minimum tensile strength, yield strength, and elongation in line with ASTM standards.
3. Dimensional tolerance: The tube must meet the specified outer diameter, wall thickness, and length requirements.
4. Surface finish: The tube must have a smooth and clean surface without cracks, scratches, or other defects.
5. Heat treatment: Titanium grade 7 tube must be subjected to appropriate heat treatment processes to ensure desirable properties.
6. Traceability: The tube must be traceable back to its raw materials and the manufacturing process.
7. Testing and inspection: The tube must undergo various tests and inspections, including chemical analysis, ultrasonic testing, eddy current testing, and visual inspection, to ensure its quality and suitability for its intended purpose.
14. What is the weight of titanium grade 7 tube?
the weight of a titanium tube is determined by several factors, including its size, wall thickness, length, and density. Titanium grade 7 has a density of approximately 4.48 g/cm3. Therefore, the weight of a tube can be calculated using the formula:
Weight = (Density x Volume)
Volume = π x [(Outer diameter)^2 – (Inner diameter)^2] x Length
Once you have the measurements for the tube’s outer and inner diameter, and length, you can plug the values into the formula to calculate its weight.
15. What is the corrosion resistance of titanium grade 7 tube?
Titanium grade 7 tube has a very high corrosion resistance, especially in environments that are highly acidic or alkaline. It is also resistant to seawater and other corrosive substances, making it an ideal material for use in maritime applications such as shipbuilding and offshore oil drilling. Titanium grade 7 is also favored in the chemical and petrochemical industries for its ability to withstand high temperatures and corrosive chemicals without corroding or degrading. Overall, titanium grade 7 tube is an excellent choice for applications requiring high strength and excellent corrosion resistance.
16. What are the welding techniques used for titanium grade 7 tube?
The welding techniques used for titanium grade 7 tube include:
1. Gas Tungsten Arc Welding (GTAW or TIG) – This technique is widely used for welding titanium because it produces high-quality welds with low distortion and excellent control over the weld pool.
2. Gas Metal Arc Welding (GMAW or MIG) – This technique uses a consumable wire electrode and a shielding gas to protect the weld pool from atmospheric contamination. It is typically used for thicker sections of titanium tubing.
3. Plasma Arc Welding (PAW) – This technique uses a concentrated plasma arc to melt the base metal and filler material. It is suitable for thin-wall tubing and produces high-quality welds with low heat input.
4. Electron Beam Welding (EBW) – This technique uses a focused beam of high-energy electrons to melt the base metal and filler material. It is suitable for precision welding and produces high-quality welds with minimal distortion.
5. Laser Beam Welding (LBW) – This technique uses a high-energy laser beam to melt the base metal and filler material. It is suitable for thin and small sections of titanium tubing and produces high-quality welds with minimal distortion.
17. What are the heat treatment options for titanium grade 7 tube?
The heat treatment options for titanium grade 7 tube are as follows:
1. Annealing: It involves heating the titanium tube to a specific temperature and then cooling it slowly to improve its ductility and toughness.
2. Solution treatment: It involves heating the titanium tube to a high temperature and holding it there for a specific period to dissolve any unwanted phases or impurities.
3. Aging: After solution treatment, the tube can be heated at a lower temperature to increase its strength and hardness.
4. Stress-relieving: It is used to reduce the residual stresses in the tube, which may have developed during forming, welding or machining.
5. Quenching: It involves rapidly cooling the titanium tube after heating to increase its strength and hardness.
6. Precipitation hardening: It is a combination of solution treatment, aging, and quenching to produce high-strength titanium tubes.
The specific heat treatment option chosen depends on the desired mechanical and chemical properties, as well as the intended application of the titanium grade 7 tube.