H12 hot work Die Steel could be a five-hitter Chromium, general hot work steel that is characterized by glorious impact toughness. It contains less vanadium than the widely-used H13 hot work tool steel, and also the tungsten content provides higher temper resistance. it has smart resistance to thermal fatigue cracking (heat checking) and excellent resistance to gross cracking and thermal shock once water cooled in commission.TLS H12 hot work tool steel is usually recommended for warm tooling applications wherever most resistance to cracking is needed. Such applications embrace hot punches, die casting dies, shaping dies, hot shear blades, hot gripper dies, and extrusion tooling.

Equivalent Grades

American German Japanese China Poland
  (W.Nr) (DIN)      
AISI H-12 1.2606-SKD-62X37CrMoW5-1-

Chemical Composition (AISI H-12)

  C Si Mn P S Cr Mo V W Co Ni
AISI H-12 0.3 -0.40.8 -1.250.2- 0.6Max- 0.03Max- 0.034.75 -5.51.25 -1.750.2 -0.51 -1.7


1. Excellent Resistance to Wear, High Strength at Elevated Temperature.

2. Good Homogenizing with High Toughness.

3. Extra Fine Structure without Grain-Boundary Carbide.

4. Inclusion Shape Controlled with High Cleanliness.


1. Dies and Inner Liner for Extrusion

2. Forming Dies

3. Press Dies

4. Dies for Die-Carbide

5. Punch

6. Hot Shear

7. Immediate Roller for Cold Rolling

Heat Treatment

1. Annealing—Heating slowly and uniformly to 845~900℃, furnace cooling to 540℃ at a rate 10~20℃/hr. Hardness HB 229 max.

2. Stress Relieving — Heat to 650~675℃, furnace cooling.

3. Hardening—

               Preheating (1): Heat to approx. 540~650℃, holding 30 minutes per 25mm.

               Preheating (2): Heat to approx. 845~870℃, holding 30 minutes per 25mm.

 4. Austenitizing: Heat to approx. 1010~1050℃, holding 30 minutes per 25 mm.

              Quenchant: By oil or air.

5. Tempering— 540~650℃, holding 60 inutes per 25mm. Air cooling. Double tempering.

Tempreing Curve: