CSCase study · Heat treatment
Quenched mandrels for a cold-rolling line
Client[Client name] cold-rolling line
LocationBilbao, ES
CategoryHeat treatment
Duration6 weeks
CompletedJanuary 2026
01The brief
Mandrels held to a tight hardness band
The cold-rolling line's coiler mandrels were wearing unevenly because the old segments had soft spots. The replacement had to hold a narrow hardness band along its full length.
We quenched and tempered four mandrel segments in our 6 m furnace with thermocouples along each part, then straightened and machined them. A hardness map for every segment went into the dossier.
02What we did
One furnace, one record per segment
- Quenched and tempered four segments in the 6 m furnace, surveyed to AMS 2750
- Logged thermocouple positions, times and temperatures for every load
- Straightened and machined the segments after heat treatment
- Mapped hardness along each segment and shipped the charts with the parts
6wksFrom arrival to dispatch
40HRCTarget hardness, held on every segment
4segsQuenched, tempered and machined
“The hardness maps were the first thing our metallurgist asked for, and they were already in the box.”
IGI. GarmendiaMaintenance lead, cold-rolling line
