Grade 7 Titanium Bar 3.7235 UNS R52400
Grade 7 titanium bar: Ti-0.12~0.25%Pd
density:4.52g/cm3
melting temperature:1665℃+/-5℃
Application: especially in HCl and H2SO4 solutions.
Product Introduction
Grade 7 titanium round bar is a palladium-enhanced titanium alloy (Ti-0.2% Pd) designed for superior corrosion resistance in aggressive chemical environments. It is commonly known as Ti-Pd alloy bar.
Compared with commercially pure titanium (Grade 2), Grade 7 offers significantly improved resistance to crevice corrosion and reducing acids, especially under low temperature and high pH conditions.
Material Designations
UNS Number: R52400
European Standard: 3.7235
Chinese Grade Equivalent: TA9
Common Name: Grade 7 / Ti-Pd Alloy
Chemical Composition (wt%)
Element | Content |
C | ≤ 0.08% |
H | ≤ 0.015% |
O | ≤ 0.25% |
N | ≤ 0.03% |
Fe | ≤ 0.30% |
Pd | 0.12 – 0.25% |
Others (Al, V, Ni, Mo) | Balance (none intentionally added) |
Key Features
Outstanding Corrosion Resistance
Especially effective in HCl, H₂SO₄, and chloride-containing environments.
Enhanced Crevice Corrosion Resistance
Palladium addition significantly improves performance in low-temperature and high pH conditions.
Good Mechanical Properties
Comparable to Grade 2 titanium in strength and formability.
Excellent Weldability
Suitable for fabrication in complex industrial systems.
Long Service Life in Harsh Environments
Ideal for highly corrosive chemical processes.
Corrosion Performance (Typical Media)
Medium | Concentration | Temperature | Corrosion Rate |
AlCl₃ | 10% | 25°C / boiling | 0.025 mm/a |
CaCl₂ | 73% | 177°C | 0 |
Citric Acid | 50% | Boiling | 0.025 mm/a |
Formic Acid | 50% | Boiling | 0.08 mm/a |
Oxalic Acid | 1% | Boiling | 1.14 mm/a |
H₃PO₄ | 10% | Boiling | 0.13 mm/a |
Applications
Chemical processing equipment
Chlor-alkali industry
Marine engineering systems
Heat exchangers
Acid storage and handling systems
Offshore and seawater systems
Summary
Grade 7 titanium (Ti-Pd alloy) is a high-performance corrosion-resistant material developed by adding a small amount of palladium to commercially pure titanium. This significantly enhances resistance to reducing acids and localized corrosion, making it ideal for highly aggressive chemical and marine environments, especially in HCl and H₂SO₄ applications.
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