Specify a material, not just “steel”
Provide the grade and relevant material standard. If substitutions are permitted, define the approval process instead of assuming that a similar name means equivalent chemistry and performance. If the material is not yet selected, identify the operating requirements and make the open decision visible.
Distinguish the treatment routes
Through hardening, carburizing and induction hardening can create different distributions of hardness. The choice depends on the approved design and material. Do not replace a treatment requirement with a generic phrase such as “wear resistant”; it does not tell production which final condition is required.
State hardness and depth requirements clearly
Where the drawing specifies surface or core hardness, include the location and the measurement basis. Case-depth requirements should identify the relevant definition and evaluation location. If only particular zones are treated, show those zones and any masking or exclusion areas on the drawing.
Allow for movement during treatment
Heat treatment can change dimensions and alignment. A gear shaft, thin ring and compact gear wheel may need different workholding and finishing plans. The drawing’s final dimensions should therefore be reviewed with the treatment sequence and the allowance available for subsequent machining or grinding.
Define the final tooth and surface condition
If teeth must be ground after hardening, specify that requirement and the final gear acceptance limits. Also identify critical bores, journals or faces that require finishing after treatment. A treated blank supplied for finishing needs a clearly described incoming condition.
Agree the evidence before production
Identify the material certificate, hardness record, treatment record or other evidence required for the project. Sampling and report scope should be part of the quotation. List the required tests and reports so the supplier can quote the correct inspection scope.
Quick review checklist
| Review item | What to define |
|---|---|
| Material | Grade, standard and substitution approval |
| Treatment | Route, treated zones and excluded zones |
| Hardness | Specified values, locations and method |
| Case depth | Definition and evaluation requirement, if applicable |
| Final finishing | Grinding, interface finishing and inspection scope |
Relevant products and capabilities
Discuss your part requirements
Send the current drawing, quantity and application. Include the inspection records required for your project.
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