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H12 Hot Work Steel

CHEMICAL COMPOSITION OF H12 TOOL STEEL (Typical Analysis in %)

C Si Mn P S Cr W Mo V
0.30-0.40 0.80-1.25 0.20-0.60 0.003 max 0.030max 4.75-5.50 1.00-1.70 1.25-1.75 0.20-0.50

 

USA Germany Japan British
AISI / SAE DIN, WNr JIS G4404 BS 4659
H12 / T20812 1.2605 / X35CrWMoV5 SKD62 BH12

H12 Hot Work Die Steel could be a five-hitter Cr, general hot work steel that is characterized by wonderful effect strength. It contains less vanadium than the broadly utilized H13 hot work tool steel, and furthermore the tungsten content gives 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 normally prescribed for warm tooling applications wherever most resistance from cracking is required. Such applications grasp die casting, hot punches, hot shear cutting edges, shaping dies, extrusion tooling and hot gripper dies.


STEEL PROPERTIES

  • Magnificent Resistance to Wear
  • High Strength at Elevated Temperature
  • Homogenizing with High Toughness
  • Additional Fine Structure without Grain-Boundary Carbide

PHYSICAL PROPERTIES

Coefficient of Thermal Expansion at °C 10¯⁶ m / (m*K)
20-100 11.7
20-250 12.4
20-500 12.9

HEAT TREATMENT

Soft Annealing °C 820
Cooling Furnace
Hardness HB max. 240
Hardening °C 1030-1130
Quenching Oil or Hot Bath 500-550°C
Hardness after quenching HRC 57

 

Tempering°C after quenching 100 210 300 400 500 600 700 800 900
HRC 55 54 54.3 54.8 53 51 48 41 34