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4340 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 4340

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AS 4340

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This page is mainly introduced the 4340 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 4340,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
4340

Steel Garde:4340
Type:Special Alloy
Country:Australia
Standard:AS
Application:Australia Structural steel

Relevant products:

D6AC Forging Hollow Bar

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
ICI 4340	AISI	USA
414340	CSN	Czech Republic
14340	CSN	Czech Republic
4340	AS	Australia
4340 H	AS	Australia

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength	593～916	σb/MPa
Yield Strength	628	σ 0.2 ≥/MPa
Elongation	63	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	441～430	-
HRC	30	-

Physical Properties

Thermal expansion	86-16	e-6/K
Thermal conductivity	84-85	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	2043-4352	째C
Density	8376-7833	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)
4340 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