TA9 (Ti-0.2Pd, corresponding to US standard Grade 7 / Gr7) is an α-type corrosion-resistant titanium alloy containing trace amounts of palladium (Pd). It was developed specifically to address the problem of pitting and crevice corrosion that easily occurs in industrial pure titanium (TA1/TA2) under reducing acid and high-temperature chloride ion environments. It is a core corrosion-resistant material in the chemical, marine, and nuclear power fields.
I. Product Introduction
1. Core Components (GB/T 3620.1)
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Elements |
Ti | Pd | Fe | O | C | N | H |
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Content (wt%) |
≥98.5% | 0.12% ~0.25% | ≤ 0.30% | ≤ 0.20% | 0.08% | 0.05% | 0.015% |
2. Main Properties
Mechanical Properties
Tensile Strength: ≥ 450 MPa (Measured 480~620 MPa)
Yield Strength: ≥ 250 MPa (Measured 320~450 MPa)
Elongation: ≥ 20% (Good plasticity, easy to process and form)
Density: 4.51 g/cm³ (Lightweight)
Corrosion Resistance (Core Advantage)
Mechanism: Pd element accumulates at defects in the surface passivation film (TiO₂), forming a cathode, promoting the self-repair of the passivation film, and providing extremely strong resistance to pitting corrosion and crevice corrosion.
Working Condition Performance:
Boiling 5% hydrochloric acid: Corrosion rate < 0.1 mm/year
60°C 20% sulfuric acid: Corrosion rate < 0.05 mm/year
High-temperature seawater, chlorides, acetic acid: Far exceeds TA2 and 316L stainless steel
Processing Performance
Good cold/hot working, welding, and stamping performance; weld corrosion resistance is close to that of the base material. 3. Common Product Forms: Plates (hot-rolled/cold-rolled/pickled), Bars (black-skinned/peeled/polished), Pipes (seamless/welded), Wires, Forgings, Flanges/Fittings
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II. Typical Product Applications
TA9 is mainly used in critical equipment requiring strong corrosion, high reliability, and long service life. Its core applications are as follows:
1. Chemical/Petrochemical (Main Application)
PTA/Acetic Acid Plants: Reactor linings, heat exchangers, slurry piping, reboilers
Chlor-Alkali Industry: Electrolytic cell anode plates, wet chlorine piping, brine preheaters
Organic Acids/Inorganic Acids: Storage tanks, pumps, and valves for sulfuric acid, hydrochloric acid, and oxalic acid media
Chemical Fibers: Spinning components, spinnerets (HF acid resistant)
2. Marine Engineering and Shipbuilding
Seawater Desalination: Reverse Osmosis (RO) membrane stack end caps, high-pressure pipelines, condensers
Deep Sea/Shipbuilding: Seawater pump impellers, piping systems, sonar hoods, deep-sea equipment housings
Offshore Oil and Gas: High-chloride oil and gas field development pipe fittings, blowout preventers, underwater connectors
3. Energy and Nuclear Power
Nuclear Power: Pressurized water reactor seawater systems, spent fuel reprocessing equipment, nuclear waste storage tanks
Thermal Power/ 4. Flue Gas Desulfurization: FGD unit spray pipes, demisters, absorber tower internals
5. Aerospace: Engine fuel/hydraulic pipelines, pressure vessel valves, corrosion-resistant fasteners (used in C919 and other models)
6. Medical and Food: Medical: Artificial joints, orthopedic implants (excellent biocompatibility + corrosion resistance)
Food/Pharmaceutical: High-purity acidic media equipment, fermenters, heat exchangers
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Quality Control and Testing
Each product undergoes rigorous inspection before shipment:
Dimensional Inspection: Precise measurement of thickness, length, and width
Chemical Composition and Mechanical Property Analysis: Third-party testing reports
Surface Inspection: Visual and microscopic inspection for defects
Ultrasonic Testing: Detection of internal defects
Why Choose Us
Technology and Quality: Located in Baoji, China's Titanium Valley, we possess professional production technology and extensive experience in non-ferrous metal manufacturing.
Global Coverage: We provide consistently high-quality products to customers in Australia, South Korea, Germany, the USA, the UK, Malaysia, and the Middle East.
Quality Commitment: We never compromise on quality and are responsible for every product we manufacture.
Technical Support: We have professional personnel overseeing the entire process from raw materials to finished products!
Contact Us
Our team is dedicated to serving you and hopes that every product you purchase will meet your expectations!
Email: lucky@bjfreelong.com
WhatsApp: +86 13335371763

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