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H21

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T20821 T20822
#H21

Description

USA ASTM H21 Tool Die Steels Hot-Work Tool Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Tool Die Steels: H21
Category Class Grade Standard Country Application
Steel GradesTool Die Steels H21 ASTM USA Hot-Work Tool Steel

Chemical composition(mass fraction)(wt.%) of the H21

C Si Mn P S Cr Mo V W Ni＋Cu
0.26 -0.36 0.15 -0.50 0.15 -0.40 ≤0.030 ≤0.030 3.00 -3.75 ≤ ≥ 0.30 -0.60 8.50 -10.00 ≤0.75

Mechanical Properties of steel grade H21

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV/Ku (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition Brinell hardness (HBW)
247 (≥) 337 (≥) 32 32 11 Solution and Aging, Annealing, Ausaging, Q+T,etc 112

Physical Properties of steel grade H21

Temperature
(°C)		 Modulus of elasticity
(GPa)		 Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)		 Specific thermal capacity
(J/kg·°C)		 Specific electrical resistivity
(Ω mm²/m)		 Density
(kg/dm³)		 Poisson’s coefficient, ν
43 - -     0.32 -  
952 534 - 41.3 214   -  
522 - 31 33.2   121 343

Heat Treatment of steel grade H21

Heat treated : 1939°C - 1772°C

Technological Curves of steel grade H21

Cross Reference Table (Equivalent Grade) of H21

Grade Standard Country Application
ASTM H21
SUH21
SCH21
SCMnH21
SCPH21
SCPH21-CF
H21
H21
H21
H21
SUH21
SUH21
BH21
BH21
BH21A
BH21A
03X21H21M4Γ
GH2136
GH2135
GH2132
T20821 T20822
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