The core strength of titanium alloy screws: GR5 (Ti-6Al-4V) has a tensile strength of approximately 900–1100 MPa and a yield strength of approximately 860–950 MPa, with a specific strength more than twice that of steel.
Commonly used grades and strengths：
| Grade | Tensile strength (MPa) | Yield strength (MPa) | Typical applications |
|---|---|---|---|
| Grade 1 | 240–345 | 170–275 | Low load, corrosion resistant |
| Grade 2 | 345–485 | 275–380 | General purpose, lightweight |
| Grade 5 | 895–1100 | 860–950 | Aviation, automobiles, high-end equipment |
| Grade 9 | 860–980 | 720–820 | Medium to high strength, lightweight |
Compared to steel (same specifications):
Gr5 vs 10.9 grade steel: Tensile strength is similar (900–1100 MPa), but the specific strength is approximately 2.2 times that of steel, resulting in a 40%–50% weight reduction at the same strength.
Gr5 vs 12.9 grade steel: The yield strength of 12.9 grade steel is approximately 1100 MPa, slightly higher than Gr5; however, titanium alloys offer significant advantages in fatigue resistance, corrosion resistance, non-magnetic properties, and lightweight construction.
Key Strength Properties
Extremely High Specific Strength: With a density of only 4.51 g/cm³, it achieves "weight reduction + strength preservation" in aerospace, automotive, and high-end equipment.
Excellent Fatigue Performance: High-cycle fatigue limit ≈500 MPa, approximately twice that of 45 steel, offering superior vibration and loosening resistance.
High-Temperature Stability: Gr5 maintains stable strength up to 450℃, superior to aluminum alloys (<200℃).
Non-Magnetic and Corrosion-Resistant: Non-ferromagnetic, suitable for precision electronics; naturally resistant to salt spray, acids, and alkalis, resulting in a long service life.
Strength Grades and Selection
Low Strength (Grade 1/2): Tensile strength < 500 MPa, used in non-load-bearing, corrosion-resistant applications.
Medium-High Strength (Grade 5/9): Tensile strength 860–1100 MPa, corresponding to ISO 8.8–10.9 grades, covering most industrial and high-end applications.
Ultra-High Strength: Special alloys (such as Ti-10V-2Fe-3Al) can reach 1200 MPa+, used in critical aerospace structures.
Titanium alloy screws are widely used in aerospace, medical implants and high-end machinery, and are favored for their excellent specific strength (strength to weight ratio) and environmental resistance.
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