Aisi H13 Heat Treatment Process Guide Annealing Hardening Tempering Explained Simply - China

AISI H13 heat treatment is the decisive step that turns this 5% chromium hot work tool steel into a long lasting die material.

Because AISI H13 is equivalent to 1.2344, X40CrMoV5-1 and SKD61, the heat treatment practice below applies to all these designations.

1 - Soft Annealing of AISI H13

- Heat slowly to 750-800 C, hold 2-4 hours depending on section size

- Cool in furnace at max 20 C per hour down to about 600 C, then air cool

- Resulting hardness: maximum 229 HB, ideal for rough machining 2 - Stress Relieving

- After heavy machining, heat to 600-650 C, hold 2 hours, cool slowly

- This step prevents distortion and cracking during final hardening 3 - Hardening (Austenitizing)

- Preheat in two steps: 650 C then 850 C for uniform heating

- Austenitize at 1020-1050 C, holding about 20-30 minutes per inch of thickness

- Quench in vacuum furnace with high pressure nitrogen, or in oil or air for smaller sections

- As quenched hardness: about 55-58 HRC 4 - Tempering of AISI H13

- Temper immediately when the part reaches 50-70 C after quenching

- Double tempering is mandatory, triple tempering recommended for large dies

- 550 C: about 52-54 HRC

- 600 C: about 48-50 HRC

- 620 C: about 44-47 HRC, the typical choice for aluminium die casting dies

- Never temper between 250-400 C where toughness reaches a minimum 5 - Optional Surface Treatments

- Gas or plasma nitriding adds a hard surface layer for wear resistance

- PVD coatings further extend die life in abrasive applications Correct AISI H13 heat treatment gives the best combination of hot hardness, thermal fatigue resistance and toughness.

Songshun supplies H13 in annealed, pre-hardened and fully heat treated conditions, and our engineers provide free heat treatment consultation for every order.

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• Posted By: Dongguan Songshun Mould Steel Co., Ltd.

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