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P21

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T51621 T60601

Description

USA ASTM P21 Alloy tool steel and P21 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Tool Steel And Hard Alloy: P21
Category Type Steel Grade Standard Country Application
Steel GradesTool Steel And Hard Alloy P21 ASTM USA Alloy tool steel
T51603
T51604
P4
T51605
P5
T51606
P6
T51620
P20
T51621

Chemical composition(mass fraction)(wt.%) of the P21

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％) V(%) Al(%)
0.18～0.22 0.20～0.40 0.20～0.40 ≤0.030 ≤0.030 0.50～0.30 3.90～4.25 0.15～0.25 1.05～1.25

Mechanical Properties of steel grade P21

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)
761 (≥) 624 (≥) 24 21 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 233

Physical Properties of steel grade P21

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
31 - -     0.23 -  
582 534 - 12.3 113   -  
444 - 21 23.2   141 312

Heat Treatment of steel grade P21

Heat treated : 1712°C - 1713°C

Technological Curves of steel grade P21

Cross Reference Table (Equivalent Grade) of P21

Grade Standard Country Application
Q195 GBT China Engineering and welding
Q215 China Engineering and welding
Q215 B China Engineering and welding
Q235 China Engineering and welding
Q235 B China Engineering and welding
Q235 C China Engineering and welding
Q235 D China Engineering and welding
Q255 A China Engineering and welding
Q255 B China Engineering and welding
Q275 China Engineering and welding
Q235q C China Bridge structure with steel
Q235q D China Bridge structure with steel
Q345q E China Bridge structure with steel
Q345q C China Bridge structure with steel
ASTM 1030 ASTM USA General use carbon steel bar
UNS G10300 UNS USA General use carbon steel bar
ASTM 1005 ASTM USA General use carbon steel bar
UNS G10050 UNS USA General use carbon steel bar
ASTM 1006 ASTM USA General use carbon steel bar
UNS G10060 UNS USA General use carbon steel bar
T51621 T60601
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