Cr3 Forged Steel Cold Work Roll for Copper Foil Rolling Mill

The forged steel copper foil cold work roll is mainly used in the copper foil rolling mill ( copper foil calender), which is the core spare part for producing rolled copper foil.

The material usually uses Cr3 series alloy steel such as 9Cr3Mo and 8Cr3Mo, which contains high chromium and  molybdenum elements . After quenching, induction hardening, cold treatment, and tempering processes, the hardness can reach HRC 65-68 to cope with high-frequency and high-pressure friction losses during copper foil rolling.

ETERNAL can been supplied to world's top steel manufacturer :

German:SMS Group,Achenbach

Italy:Danieli,Mino

Japan:Hitachi

Austria:Andritz,etc.

What is the Difference between the Forged steel Cold Work Roll of Copper Plate Rolling Mill and Copper Foil Rolling Mill?

Core Differences:

The core difference is that the copper foil work roll has a finer diameter, higher surface accuracy, stricter hardness requirements, and purer material to meet the rolling needs of extremely thin copper foil thickness and mirror surface.

Key Selection Points:

For rolling thickness 0.1 mm and above, copper plate work rolls with diameter (Φ160~Φ650 mm), hardness (HRC58~62) and standard-precision surface are adopted.

Common requirement: 

Both require the use of forged steel material to ensure dense internal structure, refined grain size, and good comprehensive mechanical properties. 

Core Application Equipments

The Copper foil rolling mill is a high-precision cold rolling equipment designed specifically for rolling copper foil. It is mainly used to process copper strips into rolled copper foil with thicknesses ranging from a few micrometers to tens of micrometers through multiple passes of rolling. It is widely used in fields such as new energy lithium batteries and PCB circuit boards.

Types of Rolling Mills	Features	Application Scenarios
Two roll copper foil rolling mill	Used in the front-end cutting ; Rough rolling processes	Thick PCB copper foil
Four roll copper foil rolling mill	Relatively simple structure; Easy operation and maintenance; Rough rolling processes	Medium thickness copper foil; Ordinary precision copper foil
Six roll copper foil rolling mill	Compact roller structure with strong shape control capability; Rough rolling processes	Mid-to-high-end rolled copper foil; Lithium battery copper foil ; PCB copper foil

Technical Parameters 

Parameter	Specification
Brand	ETERNAL
Raw Material	ESR ingot
Material	Cr3 series forged steel
Key Features	High Hardness,wear resistant
Production Process	Electric slag remelting → forging → heat treatment → lathe machining
Heat Treatment	Normalizing; spheroidizing annealing; Oil quenching+ high-temperature tempering
Surface Treatment	Double-frequency quenching; cryogenic treatment;low-temperature tempering
Surface Hardness	HRC 65-68
Depth of Hardened Layer	20-35 mm
Surface Roughness (Ra)	Ra≤0.02μm
Inspection Test	100% UT/MT according to standards such as EN 10228 series,ASTM A388M/A388、A966/A966M

Production Process and Production Facilities

Raw Material

ESR alloy steel ingot is a must because of its high purity, dense structure, uniform composition, and controllable inclusions.It is manufactured by EAF+LF+VD+ESR. ETERNAL strictly controls the content of harmful elements such as P/S(≤0.015% ).

High Temperature Forging

ETERNAL adopts free forging, with multiple upsetting and elongation processes to break down coarse grains in the cast state, allowing for continuous distribution of metal fibers and improving overall strength and impact resistance.

Pre-heat treatment After Forging 

Normalization+spheroidization annealing, softening the matrix, refining grains, facilitating subsequent mechanical processing, while eliminating internal stresses during forging.

Rough Machining

Turn the outer circle to remove surface scale, leave machining allowance, and take samples for composition analysis and metallographic test.

Final Heat Treatment

Overall oil quenching+high-temperature tempering+surface deep induction quenching of the roll body+cryogenic treatment+low-temperature tempering;

Purpose: To obtain high hardness and deep quenched hard layer on the working surface of the roll body, retain high toughness in the roll neck and core, and prevent roller breakage and cracking in the roller neck

Final Machining

Grind step by step to meet the requirements of size, roundness, and roughness.

Quality Inspection

UT and MT are used to investigate internal/surface microcracks.

Package and Transportation

  

How Can ETERNAL Guarantee Quality?

Manufacture drawing	√	Process schedule with ETD date	√
Raw material chemical specification test 100%	√	Forging temperature control 100%	√
Heat treatment after forging 100%	√	UT test after forging 100%	√
MT test after heat treatment 100%	√	Metallographic test is optional	√
Forging sample cutting is optional	√	Sample mechanical property test is 100%	√
Finish machining is optional	√	Mechanical property test report	√
Mill test report	√	The third party Checking	√
Photos &videos of each process	√	ISO 9001,45001,14001 certificates	√
Safety export packing 100%	√	Warranty Time	√

ETERNAL Factory

Eternal  Heavy  Industry Co.,Itd covers  the   space   15000 square  meters,8000  square  meters  heavy  duty  workshop  was  builted. Its max lift height is  16 Meters and designed max  loading capacity is 75 tons.

Eternal Heavy Industry Co.,Itd  has  advanced manufacturing   equipment   including   vertical   CNC   machining   centers, frame  type   CNC  machining   centers, CNC   lathes, heavy   duty  horizontal lathes, display boring and milling machines,etc. Testing equipment includes computer   tensile   testing    machine,low   temperature    impact   tester,UT tester,MT detector,etc.

ETERNAL Service

Pre-sales service: According to the actual working conditions and needs of customers，ETERNAL recommends suitable materials and can develop and design products according to needs. Customized services can also be provided.

Strict quality control: From raw materials to the production process and before leaving the factory, all performance indicators are strictly tested, and the professional QC team controls according to the process.

After-sales service: Resolution of any issues and free maintenance and replacement of parts during the warranty period.

Production Workshop

   

         Raw material workshop                   Forging workshop                     Heat treatment workshop            Machining workshop

                

   

        Machining workshop                         Machining workshop                  Assembly workshop                      Finished product workshop

           

Eternal Clients

ETERNAL has been exported to Europe, U.S.A , South Africa, Russian, Mexico, Brazil, Peru, Chile, Korea, Vietnam, Indonesia, Middel East, etc more than 80 countries.

Our quality is accepted by customers. In future we would devote ourselves to deep research and new market, and we expect to make a better co-operation with our customers.

      

 

     

FAQ

1.What is the usage boundary of forged steel copper foil rolling mill work rolls?

Working conditions where forged steel is preferred: Rough rolling, cogging rolling, large reduction, and heavy-load backup. For medium-to-thick copper foil with a thickness of 15 μm and above.

2.Can ordinary electric arc furnace steel ingots be used instead of ESR steel ingots？

Absolutely prohibited.