Preparing tool steel for heat treatment: allowance, stress and dimensional records
· Materials knowledge
Dimensional control begins before final machining. Use a clear handover checklist to connect material condition, rough machining, treatment planning and inspection.
Dimensional control begins before final machining. Use a clear handover checklist to connect material condition, rough machining, treatment planning and inspection.
Plan before final machining
A tool passes through material removal and, where required, later thermal processing. Dimensional and shape change should therefore be considered before final machining. Published tool-steel guidance identifies residual stress after complex or asymmetric machining as an issue worth discussing in the process plan.
Establish the starting condition
Record the exact designation, delivery condition, dimensions and material identification. Distinguish a prehardened machining route from a route that still requires hardening. Include any repair or prior treatment in the handover.
Keep identification linked to each workpiece through subsequent operations. A material name on the original purchase order is not enough to reconstruct the history of an unidentified part.
Agree the sequence and allowance
Place rough machining, any proposed stress-relief stage, semi-finishing, later heat treatment and finishing on a common route sheet. The responsible providers should confirm allowance against geometry, precision requirements and the treatment plan rather than adopting one figure for every job.
Mark thin walls, deep cavities, long features and asymmetric sections. Agree the inspection datums and the way any dimensional change will be evaluated before the part leaves the machining stage.
Make before-and-after records usable
Use the same key dimensions and references where practical, and identify the measurement time, conditions and workpiece. A simple location sketch helps another person repeat the check.
A changed dimension alone does not identify which process caused it. Review the recorded history with the relevant specialists. This article is a handover guide, not a universal furnace schedule, loading instruction or heat-treatment recipe.
Technical references
This is an educational selection guide, not a batch inspection report. Brand references illustrate material families and do not imply automatic equivalence or a commercial agency relationship. The cover is an AI-generated illustration, not a photograph of our equipment, customer project or delivered part.