This is an introduction to titanium alloys, focusing on Grade 1, Grade 2, and Grade 5 in terms of chemical composition, mechanical properties, characterization, and application areas.
ASTM B348 and ASTM B265 are two standards for titanium and titanium alloy products developed by the American Society for Testing and Materials (ASTM), which provide specifications for titanium alloy bars and plates, respectively.The ASTM B348 standard specifies the requirements for titanium and titanium alloy bars, including chemical composition, mechanical properties, dimensional tolerances, and quality assurance. It applies to titanium alloy rods in several industrial fields.ASTM B265 standard specifies the requirements for titanium and titanium alloy plates, sheets and strips, and applies to titanium alloy plates in several industrial fields.
Common titanium and titanium alloy grades include: Grade 1, Grade 2, Grade 5 (Ti-6Al-4V)
Titanium Grade 1: Pure titanium with excellent ductility and corrosion resistance.
Titanium Grade 2: Pure titanium with high strength and ductility.
Titanium Grade 5 (Ti-6Al-4V): The most commonly used titanium alloy with high strength and good weldability.
Regarding the chemical composition, mechanical properties, characteristics and applications of Grade 1, Grade 2 and Grade 5, the following four tables can help you distinguish and understand titanium and titanium alloys.
| Chemical Composition |
Grade 1 |
Grade 2 |
Grade 5 |
| Titanium (Ti) |
≥99.5% |
≥99.2% |
~90% |
| Aluminum (Al) |
- |
- |
6% |
| Vanadium (V) |
- |
- |
4% |
| Iron (Fe) |
≤0.20% |
≤0.30% |
≤0.40% |
| Oxygen (O) |
≤0.18% |
≤0.25% |
≤0.20% |
| Carbon (C) |
≤0.08% |
≤0.08% |
≤0.08% |
| Nitrogen (N) |
≤0.03% |
≤0.03% |
≤0.05% |
| Hydrogen (H) |
≤0.015% |
≤0.015% |
≤0.015% |
Mechanical properties of titanium and titanium alloys
| Mechanical Properties |
Grade 1 |
Grade 2 |
Grade 5 |
| Tensile Strength |
≥240 MPa |
≥345 MPa |
≥895 MPa |
| Yield Strength |
≥170 MPa |
≥275 MPa |
≥828 MPa |
| Elongation |
≥24% |
≥20% |
≥10% |
Properties of titanium and titanium alloys
| Characteristics |
Grade 1 |
Grade 2 |
Grade 5 |
| Ductility |
Excellent |
Good |
Moderate |
| Corrosion Resistance |
Excellent |
Excellent |
Excellent |
| Strength |
Low |
Moderate |
High |
| Weldability |
Good |
Good |
Excellent |
| Machinability |
Easy to cold and hot work |
Easy to machine and form |
Good |
| Biocompatibility |
Excellent |
Excellent |
Excellent |
Application areas of titanium and titanium alloys
| Applications |
Grade 1 |
Grade 2 |
Grade 5 |
| Chemical Equipment |
Heat exchangers, reactors, piping |
Piping systems, tanks, reactors |
High-performance chemical equipment |
| Marine Engineering |
Ship and offshore structure components |
Desalination equipment, marine structures |
Marine engineering structures |
| Medical Devices |
Implants, bone plates, screws |
Surgical implants, dental implants |
Orthopedic implants, dental implants, surgical instruments |
| Aerospace |
- |
Aircraft parts, fasteners |
Aircraft and spacecraft components, engine parts |
| Food Processing |
Food processing equipment |
- |
- |
| Sporting Goods |
- |
- |
High-performance sports equipment |
| Military Applications |
- |
- |
Military vehicles, armor plates |
