TC4 Titanium Alloy: The High-Performance Material
Nov 27, 2025
What Is TC4 Titanium Alloy?
TC4 is a titanium alloy based on the nominal Ti-6Al-4V composition.
The "6Al-4V" designation refers to the approximate nominal alloying additions of 6% aluminum and 4% vanadium. Aluminum stabilizes the alpha phase, while vanadium stabilizes the beta phase, giving TC4 its characteristic α+β microstructure.
This combination provides a balance of:
High tensile strength
High strength-to-weight ratio
Low density
Excellent corrosion resistance
Good fatigue resistance
Good fracture toughness
Good weldability
Good overall thermal stability
TC4 is therefore not simply selected for maximum strength. Its major advantage is the combination of strength, weight, corrosion resistance, and manufacturability in a single titanium alloy.
TC4 Titanium Alloy Chemical Composition
| Element | Typical Requirement |
|---|---|
| Titanium (Ti) | Balance |
| Aluminum (Al) | 5.50–6.75% |
| Vanadium (V) | 3.50–4.50% |
| Iron (Fe) | ≤0.30%* |
| Oxygen (O) | ≤0.20% |
| Carbon (C) | ≤0.08% |
| Nitrogen (N) | ≤0.05% |
| Hydrogen (H) | ≤0.015% |
TC4 Titanium Alloy Physical Properties
| Property | Typical Value |
| Density | Approx. 4.43–4.45 g/cm³ |
| Elastic Modulus | Approx. 110–120 GPa |
| Melting Range | Approx. 1,600–1,660°C |
| Thermal Conductivity | Approx. 6–7 W/m·K |
| Alloy Type | Alpha-Beta (α+β) |
| Main Alloying Elements | Al + V |
TC4 Titanium Alloy Mechanical Properties
Typical room-temperature values for Ti-6Al-4V products may include:
| Mechanical Property | Typical Value |
| Tensile Strength | ≥895 MPa |
| Yield Strength | ≥825 MPa |
| Elongation | Typically ≥10% |
| Reduction of Area | Typically ≥25% |
| Hardness | Approximately 300–350 HB |
TC4 Titanium vs Grade 5 Titanium
| Item | TC4 | Grade 5 |
| Common Alloy | Ti-6Al-4V | Ti-6Al-4V |
| Designation System | Chinese | ASTM / International |
| UNS | R56400 | R56400 |
| Alloy Type | α+β | α+β |
| Aluminum | 5.50–6.75% typical | 5.50–6.75% typical |
| Vanadium | 3.50–4.50% typical | 3.50–4.50% typical |
| Density | Approx. 4.43–4.45 g/cm³ | Approx. 4.43 g/cm³ |
| Typical Use | Aerospace, industrial, marine, medical | Aerospace, industrial, marine, medical |
TC4 Titanium Alloy Standards
GB/T 3620.1
GB/T 2965
GB/T 3621
ASTM B265
ASTM B348
ASTM F136
SAE AMS specifications
FAQ
Is TC4 the same as Ti-6Al-4V?
TC4 is commonly used to designate the Ti-6Al-4V alloy in Chinese standards. Ti-6Al-4V is also commonly associated with ASTM Grade 5 / UNS R56400. The exact applicable specification should still be confirmed for each product.
Is TC4 titanium strong?
Yes. TC4 provides high tensile and yield strength while maintaining a relatively low density, giving it an excellent strength-to-weight ratio.
What is TC4 titanium used for?
TC4 is widely used in aerospace, chemical processing, marine equipment, medical components, automotive applications, fasteners, and CNC machined parts.
Is TC4 corrosion resistant?
Yes. TC4 has excellent corrosion resistance in many environments because titanium forms a protective passive oxide layer.
Is TC4 suitable for CNC machining?
Yes. TC4 is commonly CNC machined, but it requires appropriate tooling, cutting parameters, coolant, and machine rigidity because Ti-6Al-4V is relatively difficult to machine.
What is the density of TC4 titanium?
The density of Ti-6Al-4V is approximately 4.43–4.45 g/cm³, depending on the reference and specification.
What is the difference between TC4 and Grade 5 titanium?
TC4 and Grade 5 are commonly used designations for the Ti-6Al-4V alloy system. TC4 is the Chinese designation, while Grade 5 is the ASTM designation. The applicable product standard must be verified before treating them as interchangeable.
Can TC4 be welded?
Yes. TC4 can be welded, but proper inert-gas shielding and contamination control are essential to maintain weld quality.
Is TC4 suitable for heat exchangers?
TC4 can be considered for specialized heat-transfer applications, but commercially pure titanium Grade 2 is also widely used for heat exchanger and condenser tubing. The appropriate grade depends on the required strength, corrosion resistance, forming characteristics, and operating environment.
about us
We are a leading manufacturer and exporter specializing in Titanium and Titanium Alloy products. Our company is dedicated to providing a comprehensive range of high-quality titanium solutions for demanding global industries such as Aerospace, Chemical Processing, Medical, Marine Engineering, Power Generation, and Sports Equipment.
Our core export portfolio encompasses the full spectrum of wrought titanium products, including:
Titanium Tubes & Pipes: From precision Thin-Walled Titanium Tubes for heat exchangers to robust Thick-Walled Titanium Pipes for high-pressure applications.
Titanium Plates & Sheets: Supplied as Titanium Plates for heavy-duty construction and Titanium Sheets / Titanium Foils for precise manufacturing.
Titanium Bars & Rods: We supply Titanium Bars, Titanium Rods, and Titanium Wires in various diameters and finishes.
Titanium Fasteners: A complete range of Titanium Fasteners including bolts, nuts, and studs.
We expertly process all common grades to meet diverse operational requirements, including:
Commercially Pure Titanium: Gr1, Gr2
Titanium Alloys: Gr5 (Ti-6Al-4V), Gr7, Gr9 (Ti-3Al-2.5V), Gr12
Our production and quality assurance strictly adhere to international standards such as ASTM B265, ASTM B337, ASTM B338, ASTM B348, ASME SB-363, and AMS 4902, ensuring superior performance, excellent corrosion resistance, and high strength-to-weight ratio in every product.
Leveraging our advanced manufacturing expertise and stringent quality control, we are your trusted global partner for reliable, high-performance titanium materials.
