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AISI-H21 Hot Work Steel

CHEMICAL COMPOSITION OF AISI-H21 TOOL STEEL (Typical Analysis in %)


C Si Mn Cr V
0.26-0.36 0.15-0.50 0.15-0.40 3.00-3.75 0.30-0.60

H21 Steel is a hot work tool steel for oil or air hardening to develop high hot quality, support of hardness, and warmth checking resistance.

This is mostly utilized as hot work devices, instruments for manufacture of hollows, screws, rivets, nuts and bolts. Die casting tools, forming dies, die inserts, hot shear blades.

STEEL PROPERTIES

Hot work steel has great toughness and contains Tungsten, Chromium, Carbon, Vanadium and generally its working hardness is 40.0 to 55.0 HRC size and is accessible in round, level and square shapes.

APPLICATION

The H21 tungsten hot-work tool steels are primarily utilized for hot-working dies and tooling. For example extrusion, die casting & hot-forming of parts.

PHYSICAL PROPERTIES

Coefficient of Thermal Expansion at °C 10¯⁶ m / (m*K)
20-100 11.2
20-200 11.9
20-300 12.2
20-400 12.5
20-500 12.8
20-600 13.0
20-700 13.2

 

Thermal Conductivity at °C W / (m*K)
100 27.0
400 29.8
675 29.1

HEAT TREATMENT

Soft Annealing °C 780-810
Cooling Slowly
Hardness HB max. 240
Hardening °C 1000-1130
Quenching Oil or Hot Bath 600-650°C
Hardness after quenching HRC 53

 

Tempering°C after quenching 100 210 300 400 500 550 600 650 700
HRC 49 49 49 49 51 51 50 46 36