Hot Work Tool Steel

Chromium hot-work device steels are assigned as gathering H steels as indicated by the AISI classification system. This arrangement of steels begin from H1 to H19. The most usually utilized chromium hot-work steels are H11, H12, and H13, which can be air solidified in 150 mm thick segments. The steels are subjected to insignificant twisting during hardening because of their adjusted alloy content. The tool delivered from chromium hot-work steels can be cooled utilizing water without damage as these steels have low carbon and compound substance.

Chemical Composition

Element	Content(%)
Carbon, C	0.33-0.43
Manganese, Mn	0.20-0.50
Silicon, Si	0.80-1.20
Molybdenum, Mo	1.10-1.60
Chromium,Cr	4.75-5.50
Vanadium, V	0.30-0.60
Copper,Cu	0.25
Phosphorous, P	0.03
Sulfur, S	0.03
Iron, Fe	Balance

Physical Properties

Properties	Metric	Imperial
Density	7.81 g/cm3	0.282 lb/in3
Melting point	1427°C	2600°F

Mechanical Properties

Properties	Metric	Imperial
Hardness, Rockwell C (air cooled from 982°C, 45 mins)	52.5	52.5
Hardness, Rockwell C (air cooled from 1010°C, 45 mins)	56	56
Hardness, Rockwell C (air cooled from 1038°C, 45 mins)	57	57
Modulus of elasticity	207 GPa	30000 ksi
Modulus of elasticity (@538°C/1000°F)	159 GPa	23000 ksi
Modulus of elasticity (@204°C/400°F)	190 GPa	27500 ksi
Charpy impact (V-notch; air cooled from 1010°C;535°C temper temperature)	13.6 J	10.0 ft-lb
Charpy impact (V-notch; air cooled from 1010°C;650°C temper temperature)	27.1 J	20.0 ft-lb
Charpy impact (V-notch; air cooled from 1010°C;370°C temper temperature)	33.9 J	25.0 ft-lb
Machinability (1% carbon steel)	75.0 - 80.0%	75.0 - 80.0%
Poisson's ratio	0.27-0.30	0.27-0.30

Thermal Properties

Properties	Metric	Imperial
Thermal expansion (@20-100ºC/68-212ºF)	11.9 x 10^-6/ºC	6.63 µin/in°F
Thermal conductivity (@100ºC/212ºF)	42.2 W/mK	292.9 in/hr.ft².°F

Features

Heat Treatment

Forging

Annealing

Cold Working

Forming

Hardening

Machinability