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STS303 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STS303

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KS STS303

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This page is mainly introduced the STS303 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STS303,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Free - machining stainless steel wire and wire rods

Steel Garde:STS303
Type:Stainless Steels
Country:Korea
Standard:KS

Standard Number:

ITEM	Standard Number	Descriptions
1	D 3692 (2001)	Cold finished stainless steel bars
2	D 3702 (2008)	Stainless steel wire rods
3	D 3703 (2007)	Stainless steel wires
4	D 3705 (2008)	Hot rolled stainless steel plates, sheets and strip
5	D 3706 (2008)	Stainless steel bars
6	D 7202 (2004)	Free - machining stainless steel wire and wire rods

Metallographic Structure:Austenite
Application:Free - machining stainless steel wire and wire rods

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
STS303Cu	KS	Korea
STS303Se	KS	Korea

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C		0.15
Si		1.00
Mn		2.00
P		0.20
S		0.15
Cr	17.00	19.00
Ni	8.00	10.00
Mo		0.60
N

Mechanical Properties

Tensile strength	445～319	σb/MPa
Yield Strength	598	σ 0.2 ≥/MPa
Elongation	10	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	941～739	-
HRC	30	-

Physical Properties

Thermal expansion	47-59	e-6/K
Thermal conductivity	31-48	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	7531-2298	째C
Density	8791-6957	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)
STS303 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