Back Up Rolls in GCr15 With 20CrMnTi Shafts for Tension Levelers
This back up roll pairs a GCr15 rolling surface with a carburized and quenched 20CrMnTi shaft, so wear resistance and shaft toughness are handled by the right material in each place. It is produced in a 74 by 192 mm size for straightening machines.
- Roll material GCr15 bearing steel
- Shaft material 20CrMnTi, carburized and quenched
- Shaft surface hardness HRC 58-62
- Dimensions 74 by 192 mm
Key Benefits
Why the two material construction works.
Wear Resistance Where It Contacts
GCr15 gives the rolling surface the wear resistance that significantly extends service life in straightening duty.
Shaft Strength Underneath
A carburized and quenched 20CrMnTi shaft at HRC 58-62 carries the load without the brittleness of a fully hardened bearing steel shaft.
Stable Support For Flatness
Consistent support keeps flatness and quality stable for the plate or strip passing through the straightening process.
Where It Is Used
Where it is fitted.
- Tension leveler and straightening machines
- Steel plate and strip production lines
- Leveler cassettes needing dimensional consistency
- Plants replacing back up rolls on a schedule
Who It Is For
- Straightening machine operators
- Maintenance stores holding 74 by 192 mm rolls
- Rebuild shops servicing leveler cassettes
- Buyers matching material specification exactly
Problems It Solves
- Rapid wear on the rolling surface
- Shaft failure under load
- Dimensional variation between replacement rolls
- Support loss affecting plate flatness
Technical Features
Material and manufacturing specification.
GCr15 Rolling Surface
High quality GCr15 provides exceptional wear resistance and significantly extends service life.
Carburized 20CrMnTi Shaft
The shaft is 20CrMnTi, carburized and quenched to a surface hardness of HRC 58-62.
Precision Manufacturing
The 74 by 192 mm size is produced with advanced processes for dimensional accuracy and surface quality.
Specifications
This is a defined size. Other dimensions are produced to drawing.
| Roll Material | GCr15 bearing steel |
|---|---|
| Shaft Material | 20CrMnTi, carburized and quenched |
| Shaft Surface Hardness | HRC 58-62 |
| Dimensions | 74 by 192 mm |
| Function | Support for work rolls in straightening machines |
| Replacement | Supplied as complete rolls for planned replacement |
Materials
- GCr15 bearing steel roll body
- 20CrMnTi shaft, carburized and quenched
- Ground surfaces on roll and shaft
Manufacturing Process
Material Preparation
GCr15 and 20CrMnTi bar are prepared for their respective parts.
Machining
Roll body and shaft are turned to size with grinding allowance.
Heat Treatment
The shaft is carburized and quenched to HRC 58-62, the roll body hardened for wear resistance.
Grinding And Assembly
Surfaces are ground and the roll assembled to the 74 by 192 mm dimension.
Quality Control
- Material certificates for GCr15 and 20CrMnTi
- Shaft hardness verification at HRC 58-62
- Dimensional inspection to 74 by 192 mm
- Surface quality check before packing
Customization Options
- Other roll and shaft dimensions to drawing
- Material substitution where your duty requires it
- Batch quantities for scheduled replacement
- Marking per cassette position
Use Guide
- Replace rolls as a set across the cassette
- Confirm shaft fit in the housing before assembly
- Keep GCr15 rolls protected from moisture in storage
- Order replacements before the existing set reaches its wear limit
How It Compares
Against single material rolls.
| All GCr15 construction | A carburized 20CrMnTi shaft gives core toughness that a through hardened bearing steel shaft does not. |
|---|---|
| Unhardened shafts | HRC 58-62 shaft surface hardness resists wear at the bearing and mounting interfaces. |
| Generic replacement rolls | Material and hardness are specified and documented rather than assumed. |
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Read MoreBack Up Roll in GCr15 for Tension Levelers FAQ
What are the roll and shaft made from?
The roll is high quality GCr15 for wear resistance. The shaft is 20CrMnTi, carburized and quenched to a surface hardness of HRC 58-62.
What size is this roll?
74 by 192 mm. Other dimensions are produced to your drawing.
Why two different materials?
GCr15 gives the rolling surface its wear resistance, while the carburized 20CrMnTi shaft keeps core toughness under load.
How often should rolls be replaced?
Replacement is planned from tonnage and observed wear. We can advise an interval once we know your line duty.
Can you produce other sizes?
Yes. Send the drawing or a sample roll with your machine details.
What do you need to quote?
Roll and shaft dimensions or drawing, machine type, quantity per set and annual usage.
Order GCr15 Back Up Rolls
Send your roll dimensions and we confirm material, hardness and delivery.