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4140 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 4140

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AS 4140

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This page is mainly introduced the 4140 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 4140,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
4140

Steel Garde:4140
Type:Special Alloy
Country:Australia
Standard:AS
Application:Australia Structural steel

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
SAE NV7(4140)	SAE	USA
UNS H41400	UNS	USA
ICI 4140	AISI	USA
414140	CSN	Czech Republic
14140	CSN	Czech Republic
4140H	AS	Australia
4140	AS	Australia

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength	537～695	σb/MPa
Yield Strength	778	σ 0.2 ≥/MPa
Elongation	63	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	191～165	-
HRC	30	-

Physical Properties

Thermal expansion	20-33	e-6/K
Thermal conductivity	94-96	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	1512-3356	째C
Density	8614-4830	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)
4140 Special Alloy	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