The strength of titanium bolts depends on the specific material. Industrial-grade titanium alloys (such as GR5) offer extremely high strength, comparable to that of 10.9–12.9 grade high-strength steel, and have a specific strength far exceeding that of steel; pure titanium bolts have moderate strength but excellent toughness.
I. Strength Parameters of Common Titanium Bolts (at Room Temperature)
1. Pure Titanium Bolts (GR1/GR2)
Tensile Strength: 240–510 MPa
Yield Strength: 170–400 MPa
Characteristics: Strength comparable to low-carbon steel; good ductility; corrosion resistance; non-magnetic. Used in non-load-bearing, corrosion-resistant, and medical applications.
2. Titanium alloy bolts (Ti-6Al-4V, GR5) - Most commonly used
Tensile strength: 895–1100 MPa
Yield strength: 825–1000 MPa
Comparison: Equivalent to Grade 10.9, close to Grade 12.9 alloy steel bolts
Specific strength: Approximately 250 kN·m/kg, 2.2 times that of structural steel and 1.8 times that of 316 stainless steel
Fatigue strength: High; preload retention rate > 90% after 10⁷ vibration cycles
3. High-strength titanium alloy (GR23/ELI, Ti-6Al-4V ELI)
Tensile strength: 1100–1200 MPa
Characteristics: High purity, low porosity, high toughness; used in aerospace and high-end medical applications.
II. Comparison of Strength with Steel / Stainless Steel (Same Specifications)
|
Performance |
Titanium alloy(GR5) |
Grade 10.9 steel |
Grade 12.9 steel |
316 Stainless steel |
|---|---|---|---|---|
| Tensile strength (MPa) | 900~1100 | 900~1040 | 1040~1220 | 520~700 |
| Density (g/cm³) | 4.51 | 7.85 | 7.85 | 7.98 |
|
Weight ratio |
1.0 | 1.74 | 1.74 | 1.77 |
|
Specific strength |
Extremely high |
Intermediate |
High | Low |
III. Effects of Temperature and Environment on Strength
High Temperature: Strength remains stable up to 350°C (maintaining 85% of room-temperature strength); Ti-6.5Al-1Mo-1V-2Zr can withstand prolonged exposure to 550°C.
Low Temperature: Retains high toughness even at -196°C (liquid nitrogen) and does not become brittle.
Corrosion: Resistance to stress corrosion cracking (SCC) is far superior to that of steel and stainless steel.
III. Effects of Temperature and Environment on Strength
High Temperature: Strength remains stable up to 350°C (maintaining 85% of room-temperature strength); Ti-6.5Al-1Mo-1V-2Zr can withstand prolonged exposure to 550°C.
Low Temperature: Retains high toughness even at -196°C (liquid nitrogen) and does not become brittle.
Corrosion: Resistance to stress corrosion cracking (SCC) is far superior to that of steel and stainless steel.
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