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STR4 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STR4

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KS STR4

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This page is mainly introduced the STR4 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STR4,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
KS standard martensite heat resistant steel

Steel Garde:STR4
Type:Special Alloy
Country:Korea
Standard:KS
Application:KS standard martensite heat resistant steel

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
STR446	KS	Korea

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength	067～648	σb/MPa
Yield Strength	993	σ 0.2 ≥/MPa
Elongation	78	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	984～889	-
HRC	30	-

Physical Properties

Thermal expansion	77-00	e-6/K
Thermal conductivity	02-95	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	0538-4992	째C
Density	5286-9006	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)
STR4 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