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H21

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T20819 T20821
#H21

Description

USA ASTM H21 Alloy tool steel and H21 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Tool Steel And Hard Alloy: H21
Category Type Steel Grade Standard Country Application
Steel GradesTool Steel And Hard Alloy H21 ASTM USA Alloy tool steel
T20811
T20810
H12
T20812
H13
T20813
H14
T20814
H19
T20819

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

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) V(%) W(%)
0.26～0.36 0.15～0.50 0.15～0.40 ≤0.030 ≤0.030 3.00～3.75 0.30～0.60 8.50～10.0

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)
966 (≥) 482 (≥) 32 24 11 Solution and Aging, Annealing, Ausaging, Q+T,etc 211

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
23 - -     0.22 -  
777 115 - 42.3 312   -  
629 - 34 11.2   411 312

Heat Treatment of steel grade H21

Heat treated : 1286°C - 1235°C

Technological Curves of steel grade H21

Cross Reference Table (Equivalent Grade) of H21

Grade Standard Country Application
H21 ASTM USA Alloy tool steel
BH21 UK Carbide for cutting tools
BH21 UK Carbide for cutting tools
BH21A UK Carbide for cutting tools
BH21A UK Carbide for cutting tools
03X21H21M4Γ ГОСТ Russia Austenitic
ISO H21 ISO ISO ISO standard heat-resisting alloy
GH2130 GBT China Age hardening type iron base alloy
GH2132 GBT China Age hardening type iron base alloy
GH2135 GBT China Age hardening type iron base alloy
GH2136 GBT China Age hardening type iron base alloy
GH2135 GBT China wrought Fe/Ni-base superalloy
GH2150 GBT China wrought Fe/Ni-base superalloy
HGH2132 GBT China Super alloy welding wire
HGH2135 GBT China Super alloy welding wire
HGH2150 GBT China Super alloy welding wire
T20819 T20821
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