Ti Grade 2 Titanium (Gr2) ASTM B265 Titanium Round Bar for Weight-Sensitive Applications
Introduction to Ti Grade 2 Titanium (Gr2)
Titanium Grade 2 (Gr2), also known as commercially pure titanium (CP Titanium), is one of the most widely used grades of titanium due to its excellent balance of strength, corrosion resistance, and formability. It is composed of approximately 99% titanium, with small amounts of impurities such as iron, oxygen, and carbon. Grade 2 titanium is characterized by its moderate strength and high corrosion resistance, making it suitable for a wide range of weight-sensitive applications, especially in industries like aerospace, marine, chemical processing, and medical.
The ASTM B265 specification refers to the standard for titanium and titanium alloy sheets, plates, and strips, which includes round bars of Grade 2 titanium. The Ti Gr2 round bar is a versatile material that offers outstanding mechanical properties while being lightweight, making it perfect for demanding environments where weight reduction is crucial.
Properties of Ti Grade 2 Titanium (Gr2)
Chemical Composition (ASTM B265)
| Element | Gr2 Titanium Alloy |
| Titanium (Ti) | 99% |
| Oxygen (O) | ≤0.25% |
| Carbon (C) | ≤0.10% |
| Iron (Fe) | ≤0.30% |
| Hydrogen (H) | ≤0.015% |
| Nitrogen (N) | ≤0.03% |
Key Properties of Ti Grade 2 Titanium (Gr2)
| Property | Gr2 Titanium Alloy |
| Density | 4.51 g/cm³ |
| Tensile Strength | 275 MPa |
| Yield Strength | 240 MPa |
| Ultimate Tensile Strength (UTS) | 275 MPa |
| Elongation | 20% |
| Modulus of Elasticity | 105 GPa |
| Hardness (Brinell) | 190 HB |
| Fatigue Strength | 220 MPa |
| Thermal Conductivity | 21.9 W/m·K |
| Coefficient of Thermal Expansion | 8.6 x 10⁻⁶ /°C |
Mechanical Properties of Ti Grade 2 Titanium (Gr2)
Tensile Strength
Grade 2 titanium offers a tensile strength of 275 MPa, making it suitable for many applications where the material needs to withstand significant forces. Although it is not as strong as alloyed titanium grades like Grade 5 (Ti-6Al-4V), its tensile strength is sufficient for most weight-sensitive applications.
Yield Strength
The yield strength of 240 MPa means that Gr2 titanium can resist permanent deformation under typical working loads. This allows the material to maintain its structural integrity in harsh conditions, making it ideal for components subjected to moderate mechanical stress.
Elongation
Grade 2 titanium has an elongation of about 20%, which indicates its high ductility and ability to deform without breaking. This property makes it ideal for welding and forming applications, as it is less prone to cracking under stress or deformation.
Fatigue Strength
Ti Gr2 demonstrates excellent fatigue strength (220 MPa), which makes it resilient to cyclic loading or repeated stress. This is particularly important in industries like aerospace, where materials are repeatedly exposed to fluctuating forces during flight.
Corrosion Resistance of Ti Grade 2 Titanium
One of the standout features of Grade 2 titanium is its exceptional corrosion resistance. Titanium's ability to form a stable and protective oxide layer on its surface makes it highly resistant to corrosion, even in harsh environments such as seawater, chemicals, and acidic solutions.
This makes Gr2 titanium a top choice for marine applications, including shipbuilding, offshore platforms, and submarine components, where resistance to corrosion is critical. Additionally, its resistance to oxidation and pitting corrosion extends its use in chemical processing industries, where exposure to aggressive chemicals is common.
Applications of Ti Grade 2 Titanium (Gr2) Round Bar
Ti Grade 2 titanium round bars are ideal for weight-sensitive applications, especially in industries where corrosion resistance and high strength-to-weight ratios are necessary. Some of the key applications include:
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Aerospace
Ti Gr2 round bars are often used in aerospace components where low weight and high durability are critical. Components such as fasteners, aircraft structural parts, and engine parts benefit from the strength and lightness of Grade 2 titanium.
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Marine Industry
The alloy’s resistance to seawater corrosion makes it an excellent choice for marine hardware, such as propeller shafts, piping systems, heat exchangers, and subsea components.
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Chemical Processing
Gr2 titanium is used in the manufacture of tanks, valves, and piping systems in chemical plants, where resistance to acidic and corrosive substances is crucial.
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Medical and Healthcare
Ti Grade 2 is biocompatible and used for implants, prosthetics, and surgical instruments. Its lightweight, corrosion-resistant nature makes it suitable for use in the human body, particularly in orthopedic and dental applications.
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Automotive
In the automotive industry, Ti Gr2 round bars are used in exhaust systems, engine components, and lightweight structural parts, where reducing weight without compromising strength is essential for fuel efficiency and performance.
Why Choose Ti Grade 2 Titanium Round Bars for Weight-Sensitive Applications?
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Low Density
Titanium Grade 2 has a relatively low density of 4.51 g/cm³, which makes it a highly effective material for applications where weight reduction is critical without sacrificing strength and durability.
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High Corrosion Resistance
Grade 2 titanium exhibits excellent corrosion resistance, especially in aggressive environments such as seawater, acidic solutions, and chlorine. This makes it an ideal material for components that need to maintain their structural integrity over time, even in harsh conditions.
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Formability
Due to its good ductility and moderate strength, Ti Gr2 can be easily formed, welded, and machined into complex shapes, which is crucial for custom components and intricate designs.
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Cost-Effectiveness
While titanium alloys like Grade 5 (Ti-6Al-4V) offer superior strength, Grade 2 titanium is more cost-effective for applications where ultra-high strength is not required but corrosion resistance and weight savings are a priority.
Conclusion
Ti Grade 2 Titanium (Gr2) round bars, manufactured to meet ASTM B265 standards, are an excellent choice for weight-sensitive applications that demand a combination of high strength, low weight, and superior corrosion resistance. Whether in aerospace, marine, chemical processing, or medical fields, Gr2 titanium offers a durable, lightweight solution that ensures long-lasting performance under challenging conditions.
For industries that need to minimize weight without compromising on material performance or durability, Ti Gr2 round bars provide an ideal balance of properties, making them a top choice for many critical applications.
