Titanium Grade 2 vs Titanium Grade 5 vs C63000: Which Material Is Right for Your Application?
At FULLERKREG, we supply precision fasteners across a wide range of specialty materials. Titanium Grade 2 (R50400), Titanium Grade 5 / Ti-6Al-4V (R56400), and C63000 Aluminum Bronze are three distinct non-ferrous materials frequently specified for corrosion-resistant, lightweight, or marine-grade fastener applications — each with a very different strength and cost profile.
This guide provides a direct technical comparison of all three grades per their respective ASTM standards, covering chemical composition and mechanical properties to support your material selection decision.
Alloy Overview
- Titanium Grade 2 (R50400) — Commercially pure titanium with excellent corrosion resistance in seawater, oxidizing acids, and chloride environments. Lower strength than Grade 5 but superior formability and weldability. Governed by ASTM B348 Gr Ti2.
- Titanium Grade 5 / Ti-6Al-4V (R56400) — The most widely used titanium alloy, combining high strength, low density, and excellent corrosion resistance. The 6% aluminum and 4% vanadium additions provide approximately 2.5× the yield strength of Grade 2. Governed by ASTM B348 Gr Ti5.
- C63000 Aluminum Bronze — A high-strength copper-aluminum alloy with nickel and iron additions. Excellent resistance to seawater corrosion, biofouling, and wear. Non-sparking and non-magnetic. Governed by ASTM B150 C63000, supplied in HR50 (hard) condition.
Chemical Composition Comparison
All values are weight percent (%). Min = minimum required; Max = maximum allowed per respective ASTM standard.
Titanium Grade 2 — R50400 (ASTM B348 Gr Ti2)
| C | H | O | N | Fe | Other Elements (each) | Other Elements (total) | |
|---|---|---|---|---|---|---|---|
| Min | — | — | — | — | — | — | — |
| Max | 0.08 | 0.015 | 0.25 | 0.03 | 0.3 | 0.1 | 0.4 |
Balance: Titanium (Ti). Grade 2 is commercially pure titanium — no intentional alloying additions.
Titanium Grade 5 / Ti-6Al-4V — R56400 (ASTM B348 Gr Ti5)
| C | H | O | N | Fe | Other Elements (each) | Other Elements (total) | Al | V | |
|---|---|---|---|---|---|---|---|---|---|
| Min | — | — | — | — | — | — | — | 5.5 | 3.5 |
| Max | 0.08 | 0.015 | 0.20 | 0.05 | 0.4 | 0.1 | 0.4 | 6.75 | 4.5 |
Balance: Titanium (Ti). Al: 5.5–6.75%, V: 3.5–4.5%.
C63000 Aluminum Bronze (ASTM B150 C63000, Condition HR50)
| Al (%) | Cu+Ag (balance) | Fe (%) | Ni+Co (%) | Mn (%) | Si (%) | Sn (%) | Zn (%) | Condition | |
|---|---|---|---|---|---|---|---|---|---|
| Min | 9.0 | Rem. | 2.0 | 4.0 | — | — | — | — | HR50 |
| Max | 11.0 | — | 4.0 | 5.5 | 1.5 | 0.25 | 0.20 | 0.30 |
Mechanical Properties Comparison
| Grade | Standard | Condition | Tensile Strength Rm (N/mm²) min | Yield Strength Rp0.2 (N/mm²) min | Elongation A (%) min | Reduction of Area (%) min |
|---|---|---|---|---|---|---|
| Titanium Grade 2 | ASTM B348 Gr Ti2 | Annealed | ≥345 | ≥275 | ≥20 | ≥30 |
| Titanium Grade 5 (Ti-6Al-4V) | ASTM B348 Gr Ti5 | Annealed | ≥895 | ≥828 | ≥10 | ≥25 |
C63000 Aluminum Bronze — Mechanical Properties by Bar Size
| Bar Diameter (inches) | Tensile Strength Rm (N/mm²) min | Yield Strength Rp0.2 (N/mm²) min | Elongation A (%) min |
|---|---|---|---|
| 1/2″ (12 mm) – 1″ (25 mm) | ≥690 | ≥345 | ≥5 |
| 1″ (25 mm) – 2″ (50 mm) | ≥620 | ≥310 | ≥6 |
Key Differences at a Glance
| Parameter | Titanium Grade 2 (R50400) | Titanium Grade 5 (R56400) | C63000 Aluminum Bronze |
|---|---|---|---|
| Alloy family | Commercially pure Ti | Ti-Al-V alloy | Cu-Al-Ni-Fe alloy |
| Density (g/cm³) | ~4.51 | ~4.43 | ~7.6 |
| Key alloying additions | None (CP Ti) | Al 5.5–6.75%, V 3.5–4.5% | Al 9–11%, Ni+Co 4–5.5%, Fe 2–4% |
| Tensile Strength min (N/mm²) | 345 | 895 | 620–690 (by size) |
| Yield Strength min (N/mm²) | 275 | 828 | 310–345 (by size) |
| Elongation min (%) | 20 | 10 | 5–6 |
| Corrosion resistance | Excellent (seawater, oxidizing acids) | Excellent (seawater, oxidizing acids) | Very good (seawater, biofouling resistance) |
| Non-magnetic | Yes | Yes | Yes |
| Non-sparking | No | No | Yes |
| Weldability | Excellent | Good (requires inert atmosphere) | Good |
| Relative cost | Medium | High | Medium |
| Governing ASTM standard | B348 Gr Ti2 | B348 Gr Ti5 | B150 C63000 |
Application Selection Guide
Choose Titanium Grade 2 (R50400) when:
- Excellent corrosion resistance in seawater, chloride solutions, and oxidizing acids is required at moderate strength levels
- Good formability and weldability are important — Grade 2 is the most fabricable titanium grade
- Weight reduction is a priority over maximum strength
- Typical applications: marine fasteners, chemical process equipment, heat exchanger components, desalination plant hardware, medical implant components, architectural cladding fasteners
Choose Titanium Grade 5 / Ti-6Al-4V (R56400) when:
- Maximum strength-to-weight ratio is the primary requirement
- High fatigue resistance and good corrosion resistance must be combined
- Aerospace, defense, or high-performance industrial specifications require a titanium alloy fastener
- Typical applications: aerospace structural fasteners, aircraft engine bolting, marine propulsion components, orthopedic implant screws, high-performance motorsport hardware, offshore subsea fasteners
Choose C63000 Aluminum Bronze when:
- Non-sparking properties are required in hazardous or explosive environments
- Resistance to seawater corrosion and biofouling is needed alongside good wear resistance
- Non-magnetic properties are required (e.g., minesweeper hardware, sensitive instrument housings)
- Typical applications: marine propeller shafts, pump impellers, valve components, offshore platform hardware, naval vessel fasteners, oil & gas equipment in hazardous zones, bearing bushings
FULLERKREG Supply Capabilities
FULLERKREG supplies precision fasteners and engineered components in Titanium Grade 2, Titanium Grade 5, and C63000 Aluminum Bronze:
- Material Test Certificates (MTC) — EN 10204 3.1 / 3.2 available on request
- ASTM B348 / B150 compliance — rod and bar forms for fastener and structural applications
- Titanium fasteners to DIN, ISO, and custom specifications — socket head cap screws, hex bolts, studs, and nuts
- C63000 non-sparking fasteners — for ATEX and hazardous area applications
- Bulk wholesale pricing — OEM and MRO procurement with competitive lead times
- Global shipping — from our manufacturing base in China to customers worldwide
Need a quote or technical consultation for titanium or aluminum bronze fasteners? Contact FULLERKREG with your specification and our engineering team will respond promptly.
FULLERKREG — Precision Fasteners. Global Standards. Reliable Supply.