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Precision Low-Fin Stainless Steel Rolling Blade
High-precision rolling discs for the integral formation of low-profile fins on stainless steel tubes, optimized for compact heat exchanger efficiency.
- Fin Density Range:
- 16 - 40 FPI (Fins Per Inch / Low-Fin)
- Applicable Standards:
- ASTM A1012 / ASME SA1012, ASTM A269, A213
- Blade Tooling Grade:
- Premium Cr12MoV / High-Vanadium Die Steel / Tungsten Carbide
- Fin Height Range:
- 0.5mm - 1.5mm (0.02" - 0.06" Integral)
- Dimensional Accuracy:
- ±0.01mm (±0.0004") Pitch and Profile Polish (Ra < 0.12 μm)
- Hardness & Treatment:
- 63-66 HRC Cryogenically & Vacuum Heat Treated
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
Integral Cold-Rolling Mechanics
Unlike applied or welded fins, integral fins are formed by rotating rolling blades that apply intense localized pressure to the tube OD. This 'displaces' the metal into a helical fin shape while maintaining a continuous grain structure between the fin and the tube wall.
- No risk of fin separation under extreme thermal cycling
- Consistent wall thickness maintenance beneath the fin (ASTM A1012)
- Improved resistance to vibration, thermal shock, and work-hardening
Surface Area & Thermal Performance
The primary goal of low-fin rolling is to overcome the air-side or shell-side heat transfer resistance. Our precision blades ensure exact fin profiles that maximize the area-to-volume ratio.
| Fin Density (FPI) | Fin Pitch (mm / in) | Surface Area Ratio | Typical Applications |
|---|---|---|---|
| 19 FPI | 1.34mm (0.053") | 2.2x Area Increase | Process Oil Cooling & Heaters |
| 26 FPI | 0.97mm (0.038") | 2.8x Area Increase | Gas Condensers & Steam Generators |
| 32 FPI | 0.79mm (0.031") | 3.2x Area Increase | Refrigeration Evaporators & Chillers |
| 40 FPI | 0.63mm (0.025") | 3.5x+ Area Increase | Aerospace & Ultra-Compact Units |
Heat Exchanger Optimization
Nexmek's low-fin tooling allows engineers to design smaller, lighter, and more efficient shell and tube heat exchangers for critical industries:
- Petrochemical Vapor Phase Condensers
- Lube Oil Cooling in Power Generation Turbines
- Chemical Plant Solvent Recovery Units
- Advanced HVAC Water-Cooled Chillers