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P21 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of P21

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ASTM P21

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This page is mainly introduced the P21 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of P21,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Mold Steel

Steel Garde:P21
Type:Tool Die Steels
Country:USA
Standard:ASTM
Application:Mold Steel

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C	0.18	0.22
Si	0.20	0.40
Mn	0.20	0.40
P		0.030
S		0.030
Cr	0.15	0.30
Mo
V	0.15	0.25
W
Ni＋Cu		0.75
Ni	3.90	4.25
Al	1.05	1.25

Mechanical Properties

Tensile strength	177～078	σb/MPa
Yield Strength	801	σ 0.2 ≥/MPa
Elongation	42	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	862～619	-
HRC	30	-

Physical Properties

Thermal expansion	57-50	e-6/K
Thermal conductivity	87-58	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	7131-0918	째C
Density	0039-5163	kg/m³
Resistivity	0.50-0.60	Ohm.mm²/m

Heat Treatment Regime

Annealing	Quenching	Tempering	Normalizing	Q & T
√	√	√	√	√

Size Availability

Steel Grade	Specification	Processing range(mm)
P21 Tool Die Steels	Round Bar and Hollow Bar	Φ1 to Φ2000
	Square and Flat Steel	Φ10 to Φ100
	Plate and Sheet	0.08-800(Thickness)10-1500(Width)Length
	Tube or Pipe	OD:Φ4-410; WT:1-35 mm; Lenght:10-12000
	Coil and Strip Steel	THK:0.1mm Width:1500mm
	Forged	Ring/Cylindrical/Disk