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M4 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of M4

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ASTM M4

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This page is mainly introduced the M4 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of M4,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:M4
Type:Tool Die Steels
Country:USA
Standard:ASTM
Application:High-Speed Tool Steel

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
M41	ASTM	USA
M42	ASTM	USA
M43	ASTM	USA
M44	ASTM	USA
M46	ASTM	USA
M47	ASTM	USA
M48	ASTM	USA

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C	1.25	1.40
Si	0.20	0.45
Mn	0.15	0.40
P		0.030
S		0.030
Cr	3.75	4.75
Mo	4.25	5.50
V	3.75	4.50
W	5.25	6.50
Co

Mechanical Properties

Tensile strength	420～885	σb/MPa
Yield Strength	576	σ 0.2 ≥/MPa
Elongation	20	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	256～999	-
HRC	30	-

Physical Properties

Thermal expansion	54-42	e-6/K
Thermal conductivity	21-52	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	7755-5044	째C
Density	5490-6377	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)
M4 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