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STS440A chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STS440A

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KS STS440A

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This page is mainly introduced the STS440A chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STS440A,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
STS440A

Steel Garde:STS440A
Type:Special Alloy
Country:Korea
Standard:KS
Application:martensitic steel

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
STS440A	KS	Korea

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength	169～821	σb/MPa
Yield Strength	617	σ 0.2 ≥/MPa
Elongation	68	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	676～705	-
HRC	30	-

Physical Properties

Thermal expansion	42-33	e-6/K
Thermal conductivity	50-62	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	9424-5744	째C
Density	0777-5930	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)
STS440A 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