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A4

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T30103 T30104
#A4

Description

USA ASTM A4 Alloy tool steel and A4 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Tool Steel And Hard Alloy: A4
Category Type Steel Grade Standard Country Application
Steel GradesTool Steel And Hard Alloy A4 ASTM USA Alloy tool steel
H41
T20841
H42
T20842
H43
T20843
A2
T30102
A3
T30103

Chemical composition(mass fraction)(wt.%) of the A4

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Mo(％)
0.95～1.05 0.10～0.50 1.80～2.20 ≤0.030 ≤0.030 0.90～1.20 0.90～1.40

Mechanical Properties of steel grade A4

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)
759 (≥) 372 (≥) 22 43 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 322

Physical Properties of steel grade A4

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
14 - -     0.44 -  
749 814 - 21.3 241   -  
965 - 23 41.2   431 121

Heat Treatment of steel grade A4

Heat treated : 1747°C - 1957°C

Technological Curves of steel grade A4

Cross Reference Table (Equivalent Grade) of A4

Grade Standard Country Application
A4 ASTM USA Alloy tool steel
A40 JIS Japan Carbide for cutting tools
ISO A4 ISO ISO ISO standard thermal deformation of stainless steel
A4 STAS/SR Romania Structural steel
A40 STAS/SR Romania Structural steel
HA4N AS Australia Australia Structural steel
CA4 AS Australia Australia Structural steel
HA400 AS Australia Australia Structural steel
SMA400AW CNS China China Taiwan Structural steel
SMA400BW CNS China China Taiwan Structural steel
SMA400CW CNS China China Taiwan Structural steel
SMA400AP CNS China China Taiwan Structural steel
SMA400BP CNS China China Taiwan Structural steel
SMA400CP CNS China China Taiwan Structural steel
SMA490AW CNS China China Taiwan Structural steel
SMA490BW CNS China China Taiwan Structural steel
SMA490CW CNS China China Taiwan Structural steel
SMA490AP CNS China China Taiwan Structural steel
SMA490BP CNS China China Taiwan Structural steel
SMA490CP CNS China China Taiwan Structural steel
T30103 T30104
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