What Are the Main Aluminum Alloy Refining Technologies?
Sep 11, 2025
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What Are the Main Aluminum Alloy Refining Technologies?
Aluminum alloy refining primarily involves removing gases and non-metallic inclusions from the molten alloy. The main gas in aluminum alloys is hydrogen (accounting for over 85%), and the primary inclusions are aluminum oxide. Since the saturated solubility of hydrogen in liquid and solid aluminum alloys differs by nearly 20 times, hydrogen is highly likely to precipitate during the solidification of aluminum alloys, causing pinholes in the castings.
Inclusions and gases interact with each other. In industrial pure aluminum, pores appear when the hydrogen content exceeds 0.1 mL per 100 g of molten aluminum alloy, whereas in high-purity aluminum, pores only appear when the hydrogen content reaches 0.4 mL per 100 g of molten aluminum alloy. This indicates that degassing must be accompanied by slag removal, and slag removal is the foundation of degassing.
Commonly used refining agents for aluminum alloys are hexachloroethane or chloride salts. These refining agents are highly effective in degassing and slag removal but are environmentally unfriendly and are gradually being replaced by non-toxic refining agents.
Researchers domestically and internationally have developed two effective refining methods: the Rotating Impeller Degasser (RID) method and the Flux Injection (FI) method. The Rotating Impeller Degasser (RID) method involves injecting inert gas into the molten alloy and using a rotating impeller to break large bubbles into small bubbles with a diameter of about 0.5 mm. These small bubbles are evenly distributed in the molten alloy and rise slowly, improving degassing efficiency.
The Flux Injection (FI) method involves uniformly injecting powdered flux into the molten alloy using inert gas as a carrier. This increases the contact area between the flux and the molten alloy, enhancing slag removal. Simultaneously, the flux alters the properties of the interface between the bubbles and the molten alloy, improving the hydrogen removal efficiency of the inert gas.
Currently, a more effective refining method combines the two approaches mentioned above, known as the Rotating Purge method. This method involves injecting powdered flux into the molten alloy based on the principles of the Rotating Impeller Degasser method.
Titanium product forms available from GNEE
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Grade |
GR1,GR2,GR3,GR5,GR6,GR7,GR9,GR11,GR12, etc. |
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Standard |
ASTM B265,ASTM F136,ASTM F67,AMS4928 |
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Size |
0.5-5.0mm x 1000mm x 2000-3500mm (Thickness x Width x Length) |
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Application |
Metallurgy, electronics, machinery, medical treatment, chemical industry, petroleum, medical treatment, aerospace |
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Supply status |
M (Y/ R/ ST) |
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Feature |
High corrosion resistance, low density, good thermal stability |
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Technics |
Hot Forged, Hot Rolled, Cold Rolled, Annealing, Pickling |
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Surface |
Bright, Polished, Pickling, Acid cleaning, Sandblasting |
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Packing |
Export Standard Woodcase |
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Payment terms |
T/T, L/C, D/A, D/P, Escrow, Western Union, PayPal |
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Certificate |
ISO 9001:2008; The third test report; TÜV Rheinland; |
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Delivery time |
7-15days according to the quantity and process of the product |
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Quality and test |
Hardness test, Bending test, Hydrostatic etc. |
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Production Name |
Titanium Alloy Bar |
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Grade |
Gr1, Gr2, Gr3,Gr4,Gr5, Gr7, Gr6,Gr9, Gr11, Gr12 ,Gr16, Gr17,Gr25 |
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Size |
All sizes can be customized |
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Application |
Metallurgy, electronics, machinery, medical treatment, chemical industry, petroleum, medical treatment, aerospace |
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Feature |
High corrosion resistance, low density, good thermal stability |
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Technology |
Hot Forged, Hot Rolled, Cold Rolled, Annealing, Pickling |
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Surface |
Bright, Polished, Pickling, Acid cleaning, Sandblasting |
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Packing |
Export Standard Woodcase |
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Delivery time |
10-25days according to the quantity and process of the product |
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Quality and test |
Hardness test, Bending test, Hydrostatic etc. |
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Item Name
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Titanium plate
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Type
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GR1, GR2, GR3, GR4, GR5, 6AL4V Eli, GR7, GR9, GR12, GR23,TB3, TB6, TC4, TC6, TC11, TC17, TC18
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Standard
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ASTM B265, AMS4911, AMS4911H, GB/T3621-2007
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Specification
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Hot Rolling: Length 1000-4000mm,Width 400-3000mm,Thickness 4.1-60mm
Cold Rolling :Length 1000-3000mm,Width 400-1500mm,Thickness 0.3-3.0mm |
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Certificate
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ISO 9001:2008
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Supply Ability
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10 Tons per Month
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Delivery
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Within 5~30 days
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Grade
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Grade 1: Pure Titanium, relatively low strength and high ductility.
Grade 2: The pure titanium most used. The best combination of strength, weldability. Grade 3: High strength Titanium, used for Matrix-plates in shell and tube heat exchangers. Grade 5: The most manufactured titanium alloy. Exceedingly high strength. high heat resistance. Grade 7: Superior corrosion resistance in reducing and oxidizing environments. Grade 9: Very high strength and corrosion resistance. Grade 12: Better heat resistance than pure Titanium. Applications as for Grade 7 and Grade 11. Grade 23: Titanium-6Aluminum- 4Vanadium ELI. Alloy for surgical implant application. |
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Application
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Metallurgy, electronics, medical, chemical, petroleum, aerospace, and others.
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Length
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Requied
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Technology
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Hot Rolled Plate (HR)
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Packing
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Standard Package
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Product Name
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High quality 0.1mm 0.2mm 0.3mm 0.4mm 0.5mm thin titanium wire price
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Material
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Pure titanium and Titanium alloy
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GR1/GR2/GR3/Gr4/GR5/GR7/GR9/GR12/Gr5Eli/Gr23
ERTi-1/ERTi-2/ERTi-3/ERTi-4/ERTi-5Eli/ERTi-7/ERTi-9/ERTi-11/ERTi-12
Ti15333/Nitinol Alloy
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Standard
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AWS A5.16/ASTM B863/ASME SB863, ASTMF67, ASTM F136, ISO-5832-2(3) etc
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Shape
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Titanium Coil Wire/Titanium Spool Wire/Titanium Straight Wire
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Wire Gauge
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Dia(0.06--6) *L
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Process
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Bar billets-hot rolling-drawing-annealing-strength-pickling
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Surface
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Polishing, picking, acid washed, black oxide
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Main Technique
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Hot Forged; Hot Rolled; Cold drawn; Straighten etc
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Material Milling Certificate
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According to. EN 10204.3.1
Including Chemical composition and Mechanical property |
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Application
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Welding, Industry, Medical, Aerospace, Electronic etc
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Processing
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CNC Machining Services: CNC Milling, CNC Turning, Laser Cutting,drilling ,Bending, Spining, Wire Cutting, Stamping, Electric
Discharge Machining (EDM) 3-axis-4-axis-5-axis Machining, Comprehensive Processing Services: Sheet Metal fabrication, Stamping, Die Casting, 3D Printing, Injection Molding Rapid Prototype,Moulds etc,Multistep Machining |
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Assembly Services
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Fastening & Splicing, Component Assembly, Full Assembly, Packaging & Labeling
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The materials we can process are• Material
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Aluminum, Stainless Steel, Titanium ,Barss,Copper,Plastic,Alloy Custom material
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Precision Tolerance
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±0.001mm~±0.005mm
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Surface Roughness
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Min Ra 0.1~3.2
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Surface Treatment
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Anodized, Bead Blasted, Silk Screen, PVD Plating, Zinc/Nickl/Chrome/Titanium Plating, Brushing, Painting, Powder Coated,
sandblasting ,Passivation, Electrophoresis, Electro Polishing, Knurl, Laser/Etch/Engrave etc. |
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Production volume
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Low to Medium Volume, Prototype, and Batch Production
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Processing Method
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Custom According to Provided CAD Drawings
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Lead Time
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Short lead Time, Typically 1-4 Weeks
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Quality Control
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Strict Quality Assurance and Inspection Processes
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Packaging
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Secure Packaging to Prevent Damage During Transit
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Certificate
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ISO9001,AS9100D,ISO45001,ISO14001,ROSH,CE etc.
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1-Piece minimum order
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Ability to Provide Samples Before Mass Production
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Customized Precision Parts
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We Look Forward to Receiving Your Customized Requirements and Establishing a Fruitful Partnership.
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GNEE is a specialized manufacturer and exporter of high-quality titanium products, including pipes, sheets, bars, wires, and fabricated parts.
We utilize advanced CNC machining, rolling, and welding equipment to ensure precision manufacturing. All products undergo strict chemical, mechanical, and non-destructive testing to guarantee compliance with international standards.
Our export-safe packaging includes wooden crates and waterproof wrapping to ensure secure delivery. If you have any needs, please feel free to contact us immediately：info@gneemetal.com
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