UNS R52400 (Ti Grade 7)
Generic Name & Other Designation
Titanium Grade 7, Titanium-Palladium Alloy Grade 7 (Ti-Pd Gr 7), W.Nr. 3.7235, Ti-Grade 7 (DIN/EN), Ti-0.15Pd
Product Overview
UNS R52400 (Titanium Grade 7) is an advanced titanium-palladium alloy engineered specifically for extreme reducing and mineral acid environments. By micro-alloying pure titanium with 0.12% to 0.25% palladium, UNS R52400 fundamentally improves the cathodic depolarization behavior of the metal.
This minor addition extends the alloy’s operational limit into dilute hydrochloric, sulfuric, and phosphoric acid streams where unalloyed Grade 2 would experience rapid surface breakdown.
Key Highlights
✅ Palladium Corrosion Defense: Small palladium addition dramatically enhances reducing-acid resistance.
✅ Crevice Corrosion Immunity: Eliminates crevice attack in hot chloride brine up to 250°C.
✅ Identical Grade 2 Mechanicals: Offers mechanical strength and formability equivalent to Grade 2.
✅ Lower Maintenance Costs: Prevents localized pitting in harsh chemical streams, extending maintenance cycles.
Chemical Composition & Physical Properties
1. Chemical Composition (wt%)
Element | Ti | Pd | Fe | C | N | O | H |
Min (%) | Bal. | 0.12 | — | — | — | — | — |
Max (%) | Bal. | 0.25 | 0.30 | 0.08 | 0.03 | 0.25 | 0.015 |
(Note: Composition strictly conforms to ASTM B265/B348/B338 specifications for Grade 7 Ti-Pd alloy.)
2. Physical & Mechanical Properties
Parameter | Value / Standard (Annealed State) |
Density | 4.51 g/cm³ (0.163 lb/in³) |
Melting Point | 1665°C (3029°F) |
Tensile Strength (Rm) | ≥ 345 MPa (50 ksi) |
Yield Strength (0.2%, Rp0.2) | 275 – 450 MPa (40 – 65 ksi) |
Elongation (A5) | ≥ 20% |
Modulus of Elasticity | 105 GPa (15.2 × 10⁶ psi) |
Available Forms
Tubular Products: Seamless heat exchanger tubes, process piping.
Flat Products: Sheared plates, vessel linings, cladding stock.
Bar & Rod: Hot-rolled round bar, valve stem stock.
Custom Fabrications: Flange rings, pipe elbows, thermowell sheaths.
Typical Application Scenarios
Chemical Processing: Equipment handling dilute hydrochloric and sulfuric acid mixtures.
Hydrometallurgy: Pressure oxidation autoclaves and acid leach recovery circuits.
Brine Concentration: Evaporator bodies handling saturated chloride solutions at high temperatures.
Quality Assurance & Testing
Positive Material Identification (PMI) confirming precise palladium concentration.
Ultrasonic NDE testing and intergranular corrosion validation.
Delivered with full EN 10204 3.1 Mill Test Certificates.
Supplier Information (BELNADE)
BELNADE supplies certified UNS R52400 titanium-palladium products worldwide. BELNADE supports critical processing projects with specialized cut-to-size services and custom logistics.
Get in Touch with BELNADE for Quotes and Technical Inquiries
📧 Email: info@belnade-material.com
🌐 Website: www.belnade-material.com
💬 Mobile/ WhatsApp: +86 158-0040-6687