Could you provide the tempering curve for H13 material?

In order to guaranty stable microstructure and consistent hardness, the core of the H13 material tempering curve is held at 550–600°C for at least two hours, completing two tempering cycles in conjunction with accurate temperature and cooling.

1 Important Tempering Curve Control Points:

Precise Temperature: To guaranty a furnace temperature difference of ≤±5°C, use a PID temperature control system with numerous temperature measurements set at 580°C.

Enough Time: Holding times should be at least two hours; for thicker pieces, add thirty minutes for each twenty-five millimeters of thickness.

Two Tempering Steps Are Crucial: In order to avoid stress rebound, the furnace must air cool to room temperature following the initial tempering.

Cooling Method: Air cooling is advised; steer clear of water cooling or air cooling as their high speed can result in additional stress.

Note: To guaranty process traceability in continuous production, it is advised to retain full heating and cooling curves for every furnace.

 

2. Recognizing and Preventing Curve Anomalies

Manifestation of Anomalies

Potential Reasons

Consequences

Hardness more than 52 HRC

Low temperature (less than 550°C) or inadequate heat retention

High brittleness and cracking propensity

Hardness < 48 HRC

Excessive heat preservation or high temperatures (> 600°C)

Weakened and more likely to collapse

Difference in Hardness > 2 HRC

Stacking in the furnace and uneven furnace temperature

Hard or soft regions in specific areas

"Precise temperature, sufficient number of cycles, and data archiving" are the safety principles that guaranty consistent performance for every batch.