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STS431 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STS431

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KS STS431

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This page is mainly introduced the STS431 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STS431,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Stainless steel bars

Steel Garde:STS431
Type:Stainless Steels
Country:Korea
Standard:KS
Standard Number:

ITEM Standard Number Descriptions

1 D 3702 (2008) Stainless steel wire rods

2 D 3706 (2008) Stainless steel bars
Metallographic Structure:Martensite
Application:Stainless steel bars

ITEM	Standard Number	Descriptions
1	D 3702 (2008)	Stainless steel wire rods
2	D 3706 (2008)	Stainless steel bars

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
STS431FB	KS	Korea

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C		0.20
Si		1.00
Mn		1.00
P		0.040
S		0.030
Cr	15.00	17.00
Ni	1.25	2.50
Mo
N

Mechanical Properties

Tensile strength	634～785	σb/MPa
Yield Strength	425	σ 0.2 ≥/MPa
Elongation	71	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	731～129	-
HRC	30	-

Physical Properties

Thermal expansion	46-94	e-6/K
Thermal conductivity	55-38	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	8268-3507	째C
Density	9900-4378	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)
STS431 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