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Special Roll Materials
for the Paper Industry
The following listed roll materials represent the special WALZEN IRLE material index of rolls designed for the Paper-Industry.
Regarding stability, surface hardness and wear resistance properties all following roll materials can be adjusted to the customers specific mill conditions.
WALZEN IRLE Material G
Microstructure and main properties
Roll shells for rolls to adjust alternating bending - and multi zone rolls are normally manufactured in grey cast iron and are coated due to the low wear resistance. Characteristic properties of the grey cast iron material are the good emergency running properties and easy ductility.
WALZEN IRLE Materials K and KT
Microstructure and main properties
The conventional and heated rolls in glazing machines, soft- and super calenders, are supplied as chilled cast iron rolls in the material K. Apart from this we recommend the optimised WALZEN IRLE material KT especially for high thermal applications.
WALZEN IRLE Material KSTV
Microstructure and main properties
For thermal rolls being used in modern high performance applications we recommend our own especially developed material KSTV. KSTV is a homogeneous chrome steel material, which distinguishes itself due to its very good shape stability under operating conditions and its wear resistance.
WALZEN IRLE Material FSC
Microstructure and main properties
The microstructure of FSC (forged steel coated) rolls consists of a homogeneous annealed material structure throughout the complete shell thickness.
Special metallurgical treatments provide high material cleanness and a low amount of non-metallic inclusions.
The recommended hardness range of FSC rolls is 280±20 HV. The required wear resistance will be achieved by a coating of thermal sprayed layers.
Depending on the application the sprayed layers either consist of ceramic-oxide materials or high wear resistant carbides of the elements Cr, W, V embedded in a base metal.
WALZEN IRLE Material FSW
Microstructure and main properties
The microstructure of FSW (forged steel with high hot strength) rolls consists of a homogeneous annealed material structure throughout the complete shell thickness. With a special adjustment of the chemical composition FSW provides high hot strength, good tempering strength and high material toughness.
Shell thickness of the rolls, the required strength/hardness as well as operating temperatures of the calenders additionally determine the chemical composition.
WALZEN IRLE Material FSI
Microstructure and main properties
The FSI forged steel rolls (forged steel inductively hardened) are made of a (Cr, Ni, Mo alloyed) tempering steel. Special metallurgical treatments provide high material cleanness and a low amount of non-metallic inclusions.
The chemical composition of the steel provides a homogeneous annealed material structure throughout the complete shell thickness. So FSI reaches mechanical and physical material properties which are needed for high operating demands.
An excellent wear resistance will be achieved by inductive surface hardening. In the non hardened section the hardness will be 360-400 HV and in the hardened martensitic layer a surface hardness up to 620 HV can be reached.
WALZEN IRLE Material FSI plus
Microstructure and main properties
The FSI plus forged steel rolls are mad of a high creep resistant NiCrMoV-tempering steel, especially developed for calender rolls. Special FSIplus properties: highest strength, toughness and security against fracture. Special metallurgical treatments provide high material cleanness and a low amount of non-metallic inclusions.
With a special adjustment of the chemical composition FSIplus provides mechanical and physical material properties for paper calender rolls, which fullfil the highest operating demands.
An excellent wear resistance will be achieved by inductive surface hardening. In the non hardened section the hardness will be 360-400 HV and in the hardened layer a surface hardness up to 620 HV can be reached.
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