The price range for a titanium bolt varies widely, from a few mao to several dozen yuan, depending mainly on its specifications (diameter and length), material grade, head shape, and purchase quantity.
The key difference between pure titanium and titanium alloys is that pure titanium is a single element, whereas titanium alloys are produced by intentionally adding elements such as aluminum and vanadium to pure titanium to achieve superior performance.
Specifically, in terms of composition and characteristics, the differences between the two are primarily reflected in the following aspects:
Industrial-Grade Pure Titanium (GR2 as an Example)
It has an extremely high titanium (Ti) content (approximately 99%), with the focus primarily on controlling the levels of impurities such as oxygen and iron.
1. Excellent overall performance: It offers a good balance of strength, ductility, corrosion resistance, and weldability, making it the most widely used industrial-grade pure titanium.
2. Lightweight: Its density is only about 4.51 g/cm³, which is approximately 60% that of steel.
3. Non-magnetic: Suitable for special environments where non-magnetic properties are required.
Applications: Chemical processing equipment (heat exchangers, reactors), seawater desalination, marine components, medical devices (non-implantable)
Titanium Alloys (Using Gr5 as an Example)
Titanium serves as the matrix, with aluminum (Al) and vanadium (V) added as the primary alloying elements; for example, GR5 contains 5.5–6.8% aluminum and 3.5–4.5% vanadium.
1. Extremely high strength: Tensile strength can reach 895–1050 MPa, far exceeding that of pure titanium, and its "specific strength" (strength-to-density ratio) is exceptional.
2. Good heat resistance: It can operate continuously at 400°C or even higher temperatures, with high-temperature performance superior to that of pure titanium.
3. Heat-treatable: Strength can be significantly improved through heat treatment.
Applications: Aerospace (engines, airframe structural components), auto racing, high-performance bicycles, medical implants (such as bone screws and joints)
Simply put, if you're seeking the ultimate in lightweight design and high strength-especially in high-temperature or high-stress environments-then titanium alloys like GR5 are the better choice. If you're working in highly corrosive environments and prioritize a balance of overall performance and cost, then industrial-grade pure titanium like GR2 is already an excellent option.
Pure titanium (e.g., Gr2): Offers excellent value for money and is the most widely used. For example, the unit price of an M8 TA2 hex head cap screw ranges from 1.50 to 3.50 yuan.
Titanium alloys (e.g., Gr5): Offer higher strength and are commonly used in applications with performance requirements, such as bicycle and motorcycle modifications. Titanium alloy bolts of the same specification are significantly more expensive than pure titanium ones. For example, an M8 Gr5 titanium alloy bolt used for modifications costs approximately 5.48 yuan each (minimum order of 200 pieces); whereas a large M14 Gr5 bolt specifically designed for automotive wheels can cost around 49 yuan each.
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