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STR3 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STR3

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KS STR3

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This page is mainly introduced the STR3 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STR3,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Heat - resisting steel bars

Steel Garde:STR3
Type:Stainless Steels
Country:Korea
Standard:KS
Standard Number:

ITEM Standard Number Descriptions

1 D 3731 (2002) Heat - resisting steel bars
Metallographic Structure:Martensite
Application:Heat - resisting steel bars

ITEM	Standard Number	Descriptions
1	D 3731 (2002)	Heat - resisting steel bars

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
STR31	KS	Korea
STR310	KS	Korea
STR35	KS	Korea
STR36	KS	Korea
STR37	KS	Korea
STR38	KS	Korea
STR309	KS	Korea
STR330	KS	Korea

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C	0.35	0.45
Si	1.80	2.50
Mn		0.60
P		0.03
S		0.03
Cr	10.00	12.00
Ni		0.60
Mo	0.70	1.30
N
Cu		0.30

Mechanical Properties

Tensile strength	505～535	σb/MPa
Yield Strength	321	σ 0.2 ≥/MPa
Elongation	86	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	234～248	-
HRC	30	-

Physical Properties

Thermal expansion	75-67	e-6/K
Thermal conductivity	06-35	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	2779-5483	째C
Density	7497-7678	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)
STR3 Stainless 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