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TA18 Titanium Alloy Bars (Ti-3Al-2.5V)
TA18 (Ti-3Al-2.5V) is a near-alpha titanium alloy combining excellent strength-to-weight ratio, weldability, and corrosion resistance. Key features include:
- Lightweight: Density ~4.48 g/cm³, ideal for aerospace and marine applications.
- High Strength: Tensile strength up to 860 MPa, superior to commercial pure titanium.
- Corrosion Resistance: Exceptional performance in chloride/saltwater environments.
- Formability & Weldability: Compatible with TIG, laser, and EB welding techniques.
- Fatigue Resistance: Suitable for cyclic-load applications
Chemical Composition
Element | Composition (wt%) | Role |
Ti | Balance | Base material |
Al | 2.5–3.5 | Stabilizes α-phase, enhances strength |
V | 2.0–3.0 | Promotes β-phase, improves ductility |
Fe | ≤0.25 | Impurity control |
C | ≤0.05 | Minimizes carbide formation |
N | ≤0.03 | Prevents embrittlement |
H | ≤0.015 | Reduces hydrogen-induced cracking |
O | ≤0.15 | Controls interstitial strengthening |
Surface Treatment
- Polished: Ra ≤0.8 μm for precision components.
- Pickled: HNO3/HF acid bath to remove oxide layers.
- Anodized: Optional for enhanced wear/color coding.
- Passivated: ASTM B600 standards for corrosion protection.
I. Material Properties and Composition
TA18 (Ti-2Al-2.5Sn-3.7Zr-0.5Mo-0.3Si) is a low-aluminum equivalent, near-α-type titanium alloy. Strengthened with aluminum, molybdenum, and silicon, it boasts a density of 4.47 g/cm³ and a phase transition point of 925°C. Its compositional design balances strength and workability, increasing tensile strength by 20%-50% compared to pure titanium while maintaining the weldability advantages of α-type alloys.
II. Core performance parameters
1. Mechanical properties
(1) Room temperature tensile strength 600-960MPa, yield strength 850MPa, elongation 8%-15%
(2) High temperature stability: torsional strength 190MPa at 400℃, no significant degradation after long-term operation at 315℃
(3) Hardness 15-17HRC, Vickers hardness 340HV, wear resistance better than TA8 alloy
2. Process performance
(1) Excellent cold working performance, can be made into precision wire through multiple drawing passes
(2) Welding performance is better than TC4 alloy, suitable for the manufacture of complex piping systems
3. Corrosion resistance
(1) Seawater corrosion rate <0.001mm/a, 3.5% The corrosion rate in NaCl solution is only 0.05mm/a
(2) The self-healing properties of the oxide film ensure stability in acid and alkaline environments
III. Typical Application Fields
1. Aerospace
(1) Aircraft hydraulic/fuel pipeline systems (compressive strength increased by 50% compared to pure titanium)
(2) Engine fasteners, pipes and other medium-temperature components (operating temperature ≤ 400℃)
2. High-end equipment
(1) Oil drilling casing, heat exchanger tubes (combination of corrosion resistance and high temperature stability)
(2) Golf club heads, bicycle frames (lightweight) Quantification and high-strength requirements)
3. Industrial precision components
(1) Chemical pumps and valves, marine engineering structural parts (outstanding seawater corrosion resistance)
(2) Non-implanted parts of medical devices (excellent biocompatibility)
IV. Selection and processing recommendations
(1) Composition control: Al content 1.5%-3.0%, Mo content 0.5% are key performance indicators
(2) Heat treatment specifications: Vacuum annealing temperature is recommended to be 750-850℃ to avoid grain coarsening
(3) Storage requirements: It needs to be stored separately from carbon steel and moisture-proof packaging
Why Choose Us ?
- Certified Supply Chain: ISO 9001/AS9100 certified production.
- Custom Sizes: Diameters 5–250 mm, lengths up to 6,000 mm.
- NDT Testing: 100% ultrasonic/eddy-current inspection.
- Traceability: Mill test reports (MTRs) with heat/lot numbers.
Applications & Industries
Aerospace:
Hydraulic and fuel pipeline systems in aircraft and engines.
Medical:
Implants and surgical instruments due to biocompatibility.
Industrial Components:
Chemical equipment, marine structures, and automotive parts.
Frequently Asked Questions
Q1: How does TA18 compare to Grade 5 (Ti-6Al-4V)?
A: TA18 offers better cold-forming and welding properties but lower ultimate strength.
Q2: Can TA18 be used in cryogenic environments?
A: Yes, it retains ductility down to -196°C (liquid nitrogen).
Q3: What’s the lead time for custom orders?
A: Typically 2–6 weeks for non-standard sizes.
Q4: What standards apply to TA18 titanium alloy?
ASTM B336: Sheet/plate specifications
GB/T 3621: Chinese national standard for bars
AMS 4907/4908: Aerospace material requirements
Q5: How does TA18 compare to other titanium alloys?
vs. TC4 (Ti-6Al-4V): Lower strength but superior cold formability and weldability
vs. Pure Titanium: Higher strength by 20–50% at room temperature
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