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STS631 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STS631

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KS STS631

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This page is mainly introduced the STS631 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of STS631,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Stainless steel bars

Steel Garde:STS631
Type:Stainless Steels
Country:Korea
Standard:KS

Standard Number:

ITEM	Standard Number	Descriptions
1	D 3534 (2002)	Cold rolled stainless steel strip for springs
2	D 3698 (2008)	Cold rolled stainless steel plates, sheets and strip
3	D 3705 (2008)	Hot rolled stainless steel plates, sheets and strip
4	D 3706 (2008)	Stainless steel bars

Metallographic Structure:Precipitation-Hardening
Application:Stainless steel bars

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
STS631CSP	KS	Korea
STS631J1	KS	Korea

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C		0.09
Si		1.00
Mn		1.00
P		0.040
S		0.030
Cr	16.00	18.00
Ni	6.50	7.75
Mo
N
Al	0.75	1.50

Mechanical Properties

Tensile strength	707～972	σb/MPa
Yield Strength	923	σ 0.2 ≥/MPa
Elongation	35	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	145～784	-
HRC	30	-

Physical Properties

Thermal expansion	16-40	e-6/K
Thermal conductivity	63-46	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	7349-1951	째C
Density	8842-8377	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)
STS631 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