DIN 1.2344 tool steel (also known as AISI H13 steel or just H13) is a tool steelgrade standardised for hot working. The main feature of this grade is the combination of alloyed elements of chromium, molybdenum and vanadium, Cr-Mo-V, which provides a high wear resistance to thermal shock.

Equivalent Grades

American German Japanese China Poland
  (W.Nr) (DIN)      
AISI H-13 1.2344GX40CrMoV5-1SKD-614Cr5MoSiV1L40H5MF/WCLV

Chemical Composition (AISI H-13)

  C Si Mn P S Cr Mo V W Co Ni
AISI H-13 0.32- 0.420.8 -1.2MAX -0.50MAX -0.030MAX -0.0304.5 -5.51- 1.50.8 -1.2


1.High Toughness

2.Good Wear Resistance

3.High Strength at Elevated Temperature

4.Fine Grain Size with High Toughness

5.High Cleanliness


1. Die and container for extrusion

2.Forming Die Die for Die-Casting

3.Tool for manufacture of screws and nuts

4.Ejector Pins

5.Tool Holders

Heat Treatment

  1. Annealing—Heating slowly and uniformly to 800~850℃, furnace cooling to 600℃ at a rate 10~20℃/h. Hardness HB 229 max
  2. Stress Relieving — 650~700℃, furnace cooling.
  3. Hardening— Preheating (1): Warming to approx. 550~600℃, holding 30 minutes per 25 mm.                                                                                                                                                       Preheating (2): Warming to approx. 800~850℃, holding 30 minutes per 25 mm.
  4. Austenitizing: Heating to approx. 1000~1050℃, holding 30 minutes per 25 mm.                                                                                                                                                                                             Quenchant: By oil or air.                                                                                                                                                                                                                                                                      Tempering—550~650℃, holding 60 minutes per 25 mm, air cooling. Double tempering.
Tempreing Curve: