AMS 4902 Grade 4 Titanium Wire Description
What is AMS 4902 Grade 4 Titanium Wire?
AMS 4902 Grade 4 Titanium Wire is an aerospace-grade commercially pure titanium wire. Aerospace Grade 4 Titanium Wire (UNS R50700) manufactured in accordance with AMS 4902 standard, It meets AMS 4902 specification and is classified as an alpha-phase titanium alloy.
It offers higher strength than Grade 1 and Grade 2 while retaining good ductility and weldability. This provides many advantages, such as high strength, good ductility and superior corrosion resistance.
Higher strength than Gr1 and Gr2–ideal for moderate load-bearing applications; good ductility–oan be formed and bent without cracking and superior corrosion resistance–outstanding performance in seawater, salt spray, and chemical environments.
With strictly controlled impurities (H ≤ 0.015%, O ≤ 0.4%), Grade 4 wire are used in aircraft structural components, chemical processing systems, marine aviation parts, and general aerospace hardware where higher strength than Grade 2 is required.
Technical Specifications
1.Diameter ranges for aerospace
- Common aviation sizes: 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 mm.
- Ultra-fine sizes for precision components: 0.1, 0.15, 0.2, 0.3, 0.4 mm.
- Common sizes: 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 mm.
2.Production processes
Titanium bar → Heating → Reversing rough rolling → Continuous rolling → Cooling & straightening → Surface treatment → Multi-pass drawing → Annealing → Finishing & inspection → Zirconium wire
3. Technical advantages
- One-heat rolling on Danieli equipment guarantees precise dimension and uniform micro-structure.
- Vacuum melting ensures high purity and stable composition.
- Multi-pass cold drawing results in a clean and uniform surface.
- Surface treatment: pickled or bright finish available.
- Precision straightening guarantees a straightness of ≤ 2/1000.
- Full-process inspection ensures dimensional accuracy and surface quality.
4. Basic Product Information
|
Item |
Details |
|
Product name |
AMS Grade 3 or Gr4 Titanium Wire |
|
Equivalent |
Gr.3 (ASTM), CP Titanium Grade 3 |
|
Execution standards |
AMS 4902, ASTM B863, GB/T 3623-2022 |
|
Supply form |
Straight wire, coil wire |
|
Surface condition |
Pickled, bright |
5.Chemical Composition (Aviation Grade)
|
Element |
Ti |
O |
Fe |
C |
N |
H |
Others (Total) |
|
Content % |
Balance |
≤0.40 |
≤0.50 |
≤0.08 |
≤0.05 |
≤0.015 |
≤0.40 |
6.Mechanical Properties (Annealed Condition)
|
Condition |
Tensile strength (MPa) |
Yield strength (MPa) |
Elongation (%) |
Hardness HV |
|
Annealed (M) |
≥ 552 |
≥ 483 |
≥ 18 |
≥ 265 |
|
Cold Drawn (Y) |
550–740 |
550–710 |
≥ 5-12 |
260–320 |
7.Physical Properties for Aviation
|
Item |
Value |
|
Density |
4.51 g/cm³ (56% of steel) |
|
Elastic modulus |
105 GPa |
|
Melting point |
~1668 ℃ |
|
Thermal expansion |
~8.6×10⁻⁶ /℃ |
|
Thermal conductivity |
~15.5 W/(m·K) |
8.Aviation Environmental Performance
|
Item |
Performance |
|
Service temperature |
From -253 ℃ to 350 ℃ |
|
Corrosion resistance |
Excellent in seawater, salt spray, fuels, and hydraulic fluids |
|
Weldability |
Good–suitable for welding applications |
|
Formability |
Moderate–good for simple bends and forms |
Aviation Product Features
- Higher Strength: Strongest among commercially pure titanium grades (1,2,3).
- Good Ductility: Maintains ≥18% elongation for forming capability.
- Superior Corrosion Resistance: Outstanding in seawater and chemical media.
- Light Weight: Density only 56% of steel – reduces aircraft weight.
- Non-magnetic: Safe for avionics and sensitive instruments.
- Cost-Effective: Higher strength alternative to Grade 2 without alloying costs.
Aviation Applications
- Airframe Structures: Medium-load brackets, support wires, structural clips.
- Fasteners: Rivets, bolts, nuts for moderate strength requirements.
- Hydraulic Systems: Medium-pressure tubing and fittings.
- Aerospace Hardware: Washers, spacers, lock rings, clamps.
Comparison: Grade 1 vs Grade 2 vs Grade 4
Grade | Tensile Strength (MPa) | Elongation (%) | Best For |
Grade 1 (AMS 4900) | 240 – 340 | ≥ 24 | Maximum formability, welding wire |
Grade 2 (AMS 4901) | 345 – 450 | ≥ 20 | Balanced strength and ductility |
Grade 4 (AMS 4902) | ≥ 552 | ≥ 18 | Highest strength among pure grades |
Quality Assurance
- Manufactured in strict accordance with AMS 4902 and ASTM B863 indurstrial and aerospace specification.
- Each batch comes with a complete Material Test Report (MTR) for full traceability.
- Multi-step quality control includes chemical analysis, mechanical testing, dimensional checks, hydrogen content analysis, and surface inspection.
- Custom sizes, straightness, surface finishes, and tempers (M, Y) are available on request.