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High hardness and wear resistance: Long term rolling maintains low roughness and high gloss, reduces roll changes, and improves efficiency
Uniform organization: avoid aluminum foil indentation, color difference, poor plate shape, and broken tape
Surface smoothness: suppresses aluminum adhesion, pinholes, and pitting, ensuring the quality of double zero foil
Good red hardness: Stable hardness under rolling temperature rise, without slipping or sticking to the roll
Resilience matching: withstand high rolling force and tension impact, not easy to peel off or break corners
element | C | Si | Mn | Cr | Mo | V | Ni | Cu | P, S |
scope | 0.78~0.90 | 0.40-1.10 | 0.20-0.50 | 4.80~5.50 | 0.20-0.60 | 0.10-0.20 | ≤0.80 | ≤0.25 | ≤0.020 |
Roll body hardness: HSD 95~102 (≈ 82~85 HSD or 60~62 HRC), aluminum foil specific high hardness range
Hardness uniformity: The total length of the roller body is ≤± 1 HSD
Organization: Tempered martensite+uniform fine alloy carbides (M ₇ C Ⅲ type), without network/band carbides
Resilience: sufficient impact resistance to prevent aluminum sticking, corner collapse, and peeling during rolling
Wear resistance: extremely high, suitable for rolling with high reduction rate, high speed, and long service life
Smelting: EAF+LF+VD+ESR (electric slag remelting), high purity, low inclusions, low hydrogen
Forging: Two upsetting and two pulling/three upsetting and three pulling, fully crushing the cast carbides to ensure uniform microstructure
Forging ratio: ≥ 3~4
Key processes of heat treatment
High temperature diffusion annealing: eliminating dendritic segregation
Quenching and tempering (preliminary heat treatment): optimizing the matrix structure
Dual frequency/power frequency quenching+cryogenic treatment: ensuring high hardness and dimensional stability
Multiple low-temperature tempering: eliminating stress, stabilizing structure, and improving toughness
Typical size
Roller diameter: 230~310 mm (increasing with the length of the roller body)
Roll body length: ≤ 2200 mm (wide width aluminum foil machine)
Surface quality (core)
Roughness Ra: 0.08~0.15 μ m (precision rolling/finished product pass)
Radial runout: ≤ 0.002~0.003 mm
Roll convexity: 0.06~0.09 mm (controllable taper/parabolic)
No scratches, soft spots, sand holes, or microcracks
Rolling thickness: 0.1-0.5 mm → 0.02-0.08 mm
Working conditions: large reduction, high rolling force, high speed, long stroke
Advantages: Wear resistance, accident resistance, long service life; Single roll aluminum content is 30-50% higher than Cr2/Cr3
Finished product thickness: 0.008-0.03mm (food/pharmaceutical/battery/cable foil)
Requirements: The roller surface should be super smooth, free of vibration patterns, with good plate shape and stable quality of bright surface
Applicable: High speed, long cycle, stable mass production; Ultra thin (<0.006mm) commonly used high-speed steel/hard alloy
Alloy: 1235, 8011, 8079, 3003, 5052 (packaging/air conditioning/battery/cable)
Features: High deformation resistance, easy to stick to rollers, strict surface requirements
8Cr5MoV Value: High hardness anti stick aluminum, wear-resistant and smooth, heat-resistant and stable plate shape
Speed: 800-1500 m/min
Requirements: High wear resistance, high stability, minimal roller replacement, high operational efficiency
Adaptation: Deep quenched hard layer, high uniform hardness, long service life
Usage: Improve flatness, eliminate internal stress, and optimize surface gloss of finished foil
Hardness: 95-100 HSD
Advantages: high hardness, wear resistance, roughness retention, uniform surface, no bright or dark stripes
