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321S51 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 321S51

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B.S. 321S51

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This page is mainly introduced the 321S51 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 321S51,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Steel boiler and superheater tubes. Specification for carbon, alloy and austenitic stainless steel tubes with specified elevated temperature properties

Steel Garde:321S51
Type:Stainless Steels
Country:UK
Standard:B.S.

Standard Number:

ITEM	Standard Number	Descriptions
1	BS 1501-3	Steels for pressure purposes. Specification for corrosion- and heat-resisting steels: plates, sheet and strip
2	BS 3059-2	Steel boiler and superheater tubes. Specification for carbon, alloy and austenitic stainless steel tubes with specified elevated temperature properties

Application:Steel boiler and superheater tubes. Specification for carbon, alloy and austenitic stainless steel tubes with specified elevated temperature properties

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
321S51(1010)	B.S.	UK
321S51(1105)	B.S.	UK
321S51 490	B.S.	UK
321S51 510	B.S.	UK
321S51 520	B.S.	UK

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C	0.04	0.10
Si		1.00
Mn		2.00
P		0.045
S		0.025
Cr	17.00	19.00
Mo
Ni	9.00	12.00
Ti		0.80

Mechanical Properties

Tensile strength	130～955	σb/MPa
Yield Strength	940	σ 0.2 ≥/MPa
Elongation	92	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	889～207	-
HRC	30	-

Physical Properties

Thermal expansion	54-90	e-6/K
Thermal conductivity	57-67	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	0378-3504	째C
Density	9754-4563	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)
321S51 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