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STR661 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STR661

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KS STR661

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This page is mainly introduced the STR661 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STR661,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Heat - resisting steel plates and sheets

Steel Garde:STR661
Type:Stainless Steels
Country:Korea
Standard:KS

Standard Number:

ITEM	Standard Number	Descriptions
1	D 3731 (2002)	Heat - resisting steel bars
2	D 3732 (2002)	Heat - resisting steel plates and sheets

Metallographic Structure:Austenite
Application:Heat - resisting steel plates and sheets

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C	0.08	0.16
Si		1.00
Mn	1.00	2.00
P		0.04
S		0.03
Cr	20.00	22.50
Ni	19.00	21.00
Mo	2.50	3.50
N	0.10	0.20
Co	18.50	21.00
W	2.00	3.00
Nb	0.75	1.25

Mechanical Properties

Tensile strength	409～765	σb/MPa
Yield Strength	283	σ 0.2 ≥/MPa
Elongation	17	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	738～720	-
HRC	30	-

Physical Properties

Thermal expansion	28-17	e-6/K
Thermal conductivity	87-38	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	9880-8521	째C
Density	2614-6858	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)
STR661 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