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M7 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of M7

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ASTM M7

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This page is mainly introduced the M7 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of M7,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
High-Speed Tool Steel

Steel Garde:M7
Type:Tool Die Steels
Country:USA
Standard:ASTM
Application:High-Speed Tool Steel

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C	0.97	1.05
Si	0.20	0.55
Mn	0.15	0.40
P		0.030
S		0.030
Cr	3.50	4.00
Mo	8.20	9.20
V	1.75	2.25
W	1.40	2.10
Co

Mechanical Properties

Tensile strength	507～759	σb/MPa
Yield Strength	775	σ 0.2 ≥/MPa
Elongation	46	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	167～173	-
HRC	30	-

Physical Properties

Thermal expansion	20-92	e-6/K
Thermal conductivity	57-35	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	6596-5794	째C
Density	6925-0035	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)
M7 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