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A7 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of A7

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ASTM A7

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This page is mainly introduced the A7 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of A7,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Cold-Work Tool Steel

Steel Garde:A7
Type:Tool Die Steels
Country:USA
Standard:ASTM
Application:Cold-Work Tool Steel

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
A723	AISI	USA

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C	2.00	2.85
Si	0.10	0.50
Mn	0.20	0.80
P		0.030
S		0.030
Cr	5.00	5.75
Mo	0.90	1.40
V	3.90	5.15
W	0.50	1.50
Ni＋Cu		0.75

Mechanical Properties

Tensile strength	746～240	σb/MPa
Yield Strength	596	σ 0.2 ≥/MPa
Elongation	98	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	476～362	-
HRC	30	-

Physical Properties

Thermal expansion	03-21	e-6/K
Thermal conductivity	70-80	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	4538-1652	째C
Density	4635-4590	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)
A7 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