Titanium grade 1 and grade 2 are the best grades of alloy materials due to their lightweight and high strength.
Titanium is divided into several grades according to their properties and applications, but commercially pure titanium has four grades (grade 1 and grade 2).
Grade 1 and grade 2 titanium are unalloyed commercially pure titanium alloys having similar properties. Grade 2 titanium is widely used due to excellent corrosion resistance, good formability, and moderate strength.
Grade 1 and grade 2 titanium have some differences in their mechanical properties. Titanium grade 2 is better than grade 1 in tensile strength and toughness.
Due to its strength, lightweight, and corrosion resistance, titanium is the perfect material for maritime and aerospace applications.
It is 45% lighter and has the same strength as steel. Titanium is utilized to make artificial joints, devices for setting or mending bones, and implanted medical equipment because it is also biocompatible.
In this article, you can learn more about difference between them, and choose the best grade of titamium for your project.
What is Titanium Grade 1?
One of the four commercially pure titanium grades is titanium grade 1, and it is also known as EN3.7025/UNS R50250 grade alloy.
It is not the most strong and softer of the four grades, with the maximum formability and corrosion resistance. It can be welded quite well.
Grade 1 titanium is typically used for corrosion resistance in the chemical and marine sectors, as well as in the construction of aircraft where maximum formability is desired.
What is Titanium Grade 2?
Titanium Grade 2, also known as EN3.7035/UNS R50400 titanium CP3, has an alpha crystalline structure.
Because it combines great formability, moderate strength, and exceptional corrosion resistance, the alloy is widely used.
Titanium Grade 2 has a density that is roughly half that of stainless steel and nickel alloys.
In oxidizing media, alkaline media, organic acids and compounds, aqueous salt solutions, and hot gases, titanium Grade 2 exhibits exceptional corrosion resistance.
The alloy exhibits useful corrosion resistance when exposed to nitric acid, moderate reducing acid, and wet chlorine or bromine gas.
Additionally, titanium grade 2 offers exceptional resistance in applications involving seawater.
Difference between Titanium Grade 1 and Titanium Grade 2
Titanium is a high-strength, lightweight element that comes in several grades. Among the most durable and popular grades are 1 and 2.
The most malleable substance with the best ductility is titanium grade 1.
Titanium Grade 2 is extremely malleable and significantly stronger.
The main difference between these two is mechanical properties. Grade 2 is marginally stronger than grade 1. The tensile strength, yield strength, and hardness of grade 2 titanium are more than grade 1.
The strong tensile strength of Grade 2 components makes them a great option for high-pressure and high-temperature systems.
Although Grade 1 components have considerable impact resistance, they are not as resistant to high pressures and temperatures as the other grades.
Let’s see the comparison of titanium grade 1 and grade 2 with their composition and properties.
Chemical Composition Comparison
Grade 1 Titanium Chemical Composition Comparison
Grade 2 Titanium Chemical Composition Comparison
Mechanical Properties Comparison
Titanium Grade 1 Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 4.51 g/cm3 | 1670°C (3040°F) | 240Mpa | 170-310Mpa | 24% |
Titanium Grade 2 Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 4.51 g/cm3 | 1665°C (3030°F) | 345Mpa | 276Mpa | 20% |
Equivalent Grades Comparison
| STANDARD | WERKSTOFF NR. | UNS | GOST | AFNOR | JIS | BS | EN | OR |
| Ti Grade 1 | 3.7025 | R50250 | – | – | – | – | – | – |
| STANDARD | WERKSTOFF NR. | UNS | GOST | AFNOR | JIS | BS | EN | OR |
| Ti Grade 2 | 3.7035 | R50400 | – | – | – | – | – | – |
Cost
Grades 1 and 2 titanium are economically pure, unalloyed alloys with similar characteristics.
The most widely used grade of titanium is grade 2, which is also the most easily accessible grade. When compared to the softest titanium grade 1, the alloys in grade 2 are a little less expensive.
It means the cost of grade 1 titanium is more than grade 2 Titanium.
Applications Comparison
Titanium grade 1 applications
The most common applications for this grade include plates, tubing, piping, and a number of other applications where improved formability and weldability are crucial.
This titanium grade 1 is utilized in many different industries, and due to its properties, it is a good option for:
- Aerospace industry
- Marine industry
- Architecture
- Orthodontic appliances
- Chemical processing facilities
- Petroleum industry
- Automotive parts
- Airplane structures and frames
Grade 2 titanium applications
- Exhaust pipes for the hydrocarbon processing industry
- Airframe skin
- Power generating
- Pressure vessel
- Piping and tubing
- Heat exchangers
- Air pollution control equipment
- Power plant cooling systems
- Medical implants
- Components of a power plant’s cooling system
Which Grade Is Better For Surgical Applications Gr 2 Or Gr 1?
The titanium alloys, grade 1 and grade 2, have similar properties, but grade 2 is slightly harder than grade 1.
Therefore, titanium Grade 2 is a preferable option for surgical applications due to its slightly increased strength.
Grade 2 materials can be used for prosthetic rods and pins, dental implants, and surgical instruments due to their increased yield strength and anti-corrosion resistance.
Conclusion
All the grade of titanium ais plays a vital role in many applications. Although grade 1 and grade 2 are widely used due to their easy availability and affordable prices.
Selecting the proper grade of titanium for your application is very important.
Strength, toughness, hardness, tensile and yield strength, chemical composition, and physical and mechanical properties are all factors that should be considered while selecting the proper titanium grade.
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