Understanding H13 Hardness Heat Treatment Guide For Tooling Buyers - China

H13 Hardness Explained - From Annealed Stock to Working Die Hardness H13 (W-Nr.

1.2344, JIS SKD61, GB 4Cr5MoSiV1) is prized for the working hardness it can hold under brutal thermal cycling.

Understanding H13 hardness at each supply stage helps buyers order the right condition and avoid costly surprises.

H13 hardness by condition:

- Soft annealed: max 229 HB (about 20-22 HRC) - ideal for machining

- After hardening (1020-1060°C, oil/pressure gas quench): 55-58 HRC as-quenched

- After first temper at ~550°C: about 52-55 HRC

- After double tempering (working condition): typically 44-50 HRC for hot work dies

- Pre-hardened supply: 38-44 HRC, ready to machine and use

- Nitrided surface layer: up to 1000-1100 HV, adding wear life Choosing the right working hardness:

- 44-48 HRC: best toughness balance for aluminum die casting dies

- 48-52 HRC: extrusion tooling and hot shear blades needing wear resistance

- 30-36 HRC: large mold bases where machinability matters more

- Over-hardening above 52 HRC raises cracking risk under thermal shock Practical heat treatment tips:

- Always double temper (and prefer a third temper for critical dies)

- Stress relieve after heavy rough machining before hardening

- Slow heating with equalization steps to avoid distortion

- Temper immediately after quenching while the part is still warm Songshun supplies H13 in every hardness condition with heat treatment charts and EN 10204 3.1 certificates.

Our engineers help you select hardness for your application and die geometry.

Contact us for material plus technical advice within 24 hours.

Songshun Company Website: https: //songshunsteel.

com/

Company Contact:

• Posted By: Songjie Forging Co., Ltd

• Phone: +86 18269260283

• Address: , China

• Email:

• Website: https://songjieforging.com/

• Business Description: Songjie Forging Co., Ltd is a top custom open-die forging manufacturer and supplier in China with over 20 years of experience.
  
  We manufacture rolled rings, open-die forgings, forged shafts, forged discs, forged cylinders, mill rolls, forged gears and crankshafts in a wide range of materials, shapes and sizes.
  
  ISO 9001 certified, annual capacity 100,000-150,000 tons, serving mining, power station, shipbuilding and other large machinery industries.