HOT WORK TOOL STEEL H21

H21 Steel is a hot work tool steel for oil or air setting to develop high hot quality, support of hardness, and warmth checking resistance. These are tungsten hot-work steels which are of different types, namely, H21 to H26 types. These steels have similar characteristics to that of high-speed steels.

Thermal shock resistance and toughness of these steels can be improved by reducing the carbon content.


This is mostly utilized in hot work gadgets, instruments for production of hollows, screws, bolts, stray pieces. Die casting tools, forming dies, die inserts, hot shear blades.



Chemical Composition


Element
Min
Max
Carbon, C0.25035
Manganese, Mn-.--0.60
Silicon, Si-.--0.40
Molybdenum, Mo----
Chromium,Cr2.003.00
W9.0010.00
V0.300.50
Co----

Physical Properties


Properties
Metric
Imperial
Density8.19 g/cm 30.296 lb/in 3
Melting point1432°C2610°F

Mechanical Properties


Properties
Metric
Imperial
Hardness, Rockwell C40.0 - 55.040.0 - 55.0
Bulk modulus140 GPa20300 ksi
Shear modulus80.0 GPa11600 ksi
Poisson's ratio (25°C)0.27-0.300.27-0.30
Elastic modulus190-210 GPa27557-30458 ksi

Thermal Properties


Properties
Metric
Imperial
CTE, linear12.4 μm/m°C6.89 μin/in°F
Thermal conductivity27.0 W/mK187 BTU-in/hr-ft 2 °F


Features


   Heat Treatment

   Forging

   Annealing

   Cold Working

   Forming

   Hardening

   Machinability

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