Forged 9Cr2Mo Cold Rolling Work Roll For Aluminum Foil Rolling Mill

9Cr2Mo forging work roll is a classic and mature material for rolling cold-rolled aluminum foil (especially medium thick aluminum foil/aluminum strip), belonging to high carbon chromium molybdenum alloy tool steel (GB/T 1299-2014). With the advantages of high hardness, high wear resistance, good hardenability, and dimensional stability, it is suitable for the high-precision and high surface quality requirements of aluminum foil cold rolling.

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Product Description

Product Advantage

Key Performance Advantages (Suitable for Aluminum Foil Rolling)

High hardness and wear resistance: After heat treatment, HRC 58~62 (≈ 95~100 HSD) ensures that the roller surface is wear-resistant and has a long service life.
Deep hardenability: The hardened layer depth is ≥ 200mm, and the hardness of the large-diameter roller body section is uniform (Δ HRC ≤ 2).
Dimensional stability: The deformation rate is extremely low (≤ 0.003mm), ensuring rolling accuracy.
High purity purity: High quality products are treated with electric slag remelting (ESR), with oxygen content<15ppm and inclusion level ≤ 1.5.
Red hardness: The hardness remains ≥ HRC 50 at 450 ℃, suitable for rolling temperature rise.

Technical Parameters

1. Standard Chemical Composition (Mass Fraction%)

element	C	Si	Mn	Cr	Mo	Ni, Cu	P, S
scope	0.85~0.95	0.25~0.45	0.20~0.35	1.70~2.10	0.20~0.40	≤0.25	≤0.025

2. Key Points Of Forging Process (Special For Aluminum Foil Rollers)

Smelting: It is necessary to use EAF+LF+VD+electroslag remelting (ESR) to ensure high purity (oxygen<15ppm, inclusions ≤ 1.5 grade).
Forging temperature:
Heating: 1050-1100 ℃ (through burning, homogenization)
Initial forging: 1000~1050 ℃
Final forging: ≥ 850 ℃ (anti cracking, grain refinement)
Forging ratio: ≥ 4:1 (sufficient crushing of carbides, continuous streamline)
Heat treatment after forging: spheroidization annealing (790-810 ℃ insulation+650-670 ℃ isothermal), softening to HB ≤ 229, easy to machine.

3. Final Heat Treatment (Key For Aluminum Foil Rollers)

Quenching: 860~880 ℃ insulation → oil cooling/isothermal nitrate (180~220 ℃)
Tempering: 520~550 ℃ × 2~3 times (stress relief, size stabilization, strength toughness matching)
Typical performance:
Roll body hardness: HRC 62~65 (HS 93~98)
Hardened layer: ≥ 10~15mm (with a diameter of 300~500mm roller)
Tensile strength: ≥ 2400MPa

Product Uses

1. Food/pharmaceutical packaging aluminum foil (mainstream)

Thickness: 0.012~0.03mm
Usage: Composite flexible packaging, pharmaceutical foil, lunch box foil
Features: High surface finish, no pinholes, wear-resistant, long cycle

2. Aluminum foil for air conditioning/heat exchanger

Thickness: 0.03~0.08mm
Usage: Air conditioning radiator, condenser, evaporator
Features: High flatness accuracy, uniform strength, and resistance to thermal adhesion

3. Cable/Electronic Aluminum Foil

Thickness: 0.015-0.05mm
Usage: Cable shielding, electrolytic capacitors, battery current collectors
Features: High purity, low pinholes, stable size

4. Ordinary industrial/decorative aluminum foil

Thickness: 0.04~0.2mm
Usage: anti-corrosion coating, thermal insulation, decoration, container
Features: Heavy load, long lifespan, low cost

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