Heat Treat Furnace Batch Log Worksheet
Heat treat shops and in-house furnace departments often keep batch logs in Excel. This worksheet gives you a clean structure with soak hours and hardness margin calculated for you, ready to export.
| Batch ID | Part number | Process | Load weight (kg) | Setpoint (deg C) | Soak time (min) | Soak hours | Quench | HRC min | HRC actual | Margin to min | Status | Date | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | ||||||||||||
2 | 2 | ||||||||||||
6 | -1 | ||||||||||||
1.5 | 0 |
Replace the example rows. Margin to min shows how close hardness runs to the lower limit; a persistently small margin is a drift signal. Set both hardness columns to 0 for processes with no hardness requirement.
Connect batch logs to work orders
Optional: a short review of how furnace batches could tie to ERP work orders and lots.
Optional. The tool and every export work without this. No spam.
How to use this worksheet
Delete the example rows and add one row per furnace load. Select the process and quench, enter load weight, setpoint, soak time and the hardness readings, and set the status. Soak hours and margin to minimum calculate on their own. Export to Excel to merge months of logs, or to PDF for a signed daily record.
What to log and why
A batch log answers two questions: was the load treated to the specified cycle, and can every part be traced to it. The minimum is batch ID, part, process, load, setpoint, soak and result. Add furnace ID and chart reference in your own copy. Specifications such as AMS 2750 for pyrometry in aerospace set expectations for instrumentation and survey frequency, so keep the log consistent with your instrument records.
Reading margin and throughput
Margin to min is actual hardness minus the lower limit. A string of loads with a margin of one or two points suggests austenitizing temperature, quench severity or tempering drift. Kilograms per soak hour is a rough utilization figure, useful to compare furnaces, but it ignores heat up and cool down time.
Common mistakes
Do not log the setpoint when the controlled thermocouple shows something different. Record the load thermocouple reading where you have one. Do not close a batch as Pass before hardness is verified on enough pieces per your sampling plan, and do not mix different parts in a logged load without listing each part.
Frequently Asked Questions
Can this replace my furnace chart recorder?
No. The log is a summary record. The chart or digital cycle record from the furnace remains the evidence of the actual temperature profile and should be kept and referenced by batch ID.
Does it support Rockwell C only?
The columns are labeled HRC but you can relabel them in your Excel copy for HRB, HV or HBW as long as the minimum and actual use the same scale.
How do I handle partial loads?
Enter one row per batch with the total load weight and list the part numbers in the part field, or split into one row per part with a shared batch ID if your customer requires it.
Why is soak time in minutes?
Most cycle sheets quote soak in minutes. The worksheet converts to hours so you can total furnace time and compare against capacity.
If you want furnace batches reconciled with work orders and lots in your ERP, Netray can help set that up privately on your servers.
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