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Rolling Blades for Bimetallic Aluminum Finned Tubes
High-performance rolling blades for bimetallic (Al-Steel/Al-Cu) finned tube extrusion, optimized for durability and seamless bonding.
- Bimetallic Sleeve & Core:
- Sleeve: Al 1050, 1060, 1100 over Core: Steel, SS 304/316, Cu, Ti
- Applicable Standards:
- ASTM B221, ASTM A1012 / ASME SA1012, ASTM B234, DIN 28180
- Blade Metallurgy:
- Tungsten-Cobalt Carbide Inserts / Vacuum-Hardened HSS M2 Matrix
- Surface Polish & Coating:
- Anti-Galling Mirror Polish (Ra < 0.08 μm) | TiAlN PVD Coating
- Max Operating Temp:
- 300°C - 325°C (572°F - 617°F Continuous Rating)
- Bonding Integrity:
- 100% Mechanical Bond with Zero Air-Gap Resistance
Applicable StandardsASTM / ASME B359, SB359, B111, B444, DIN EN 12451
Tooling Material GradesCr12MoV, D2, SKD11, High-Speed Steel M2, Carbide
Precision Tolerance±0.005 mm (±0.0002 in) Ground Finish
Compatible TubingCopper (C70600, C71500), Stainless Steel, Aluminum
Technical Specifications
Bimetallic Extrusion Kinematics
The formation of bimetallic fins requires the rolling blades to act as both a forming tool and a bonding press. Nexmek blades are set at precise feeding angles that match the helix of the fin, ensuring that the aluminum flows into the desired profile without inducing excessive stress on the core tube.
- Multi-stage progressive diameter blade sets for Al 1050, 1060, and 1100 sleeves
- Calibrated for high-pressure helical formation with 100% core tube wall protection
- Optimized for bimetallic tube production compliant with ASTM A1012 / ASME SA1012
Technical Compatibility & Performance
Our tooling is used to manufacture some of the industry's most durable heat exchange components.
| Parameter | Bimetallic Capability & Standard | Nexmek Precision Grade |
|---|---|---|
| Max Operating Temp | 300°C - 325°C (572°F - 617°F) | Thermal Stability Rated |
| Max Fin Height | Up to 16.0mm (0.630") | ±0.04mm (±0.0015") |
| Mechanical Bonding Pressure | High-Pressure Interlock | Zero Air-Gap Clearance |
| Core Wall Protection | Carbon Steel (A179), SS (A269), Cu | Zero-Indentation Contour Design |
Engineered for Aggressive Environments
Bimetallic tubes are the gold standard for Air-Cooled Heat Exchangers (ACHE) in oil refineries and petrochemical plants. Nexmek's rolling blades provide the precision necessary to ensure that the aluminum fins are robust enough to withstand high-pressure water cleaning and thermal cycling while protecting the structural core tube from corrosion.