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S.124 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of S.124

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B.S. S.124

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This page is mainly introduced the S.124 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of S.124,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Specification for aircraft material. 12 per cent chromium corrosion-resisting steel (free machining) (45/55 tonf/sq in: limiting ruling section 6 in)

Steel Garde:S.124
Type:Stainless Steels
Country:UK
Standard:B.S.

Standard Number:

ITEM	Standard Number	Descriptions
1	BS 2S 124	Specification for aircraft material. 12 per cent chromium corrosion-resisting steel (free machining) (45/55 tonf/sq in: limiting ruling section 6 in)

Application:Specification for aircraft material. 12 per cent chromium corrosion-resisting steel (free machining) (45/55 tonf/sq in: limiting ruling section 6 in)

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C	0.15	0.25
Si		1.00
Mn		1.50
P		0.045
S	0.15	0.40
Cr	12.00	14.00
Ni		1.00
Mo		0.60
Nb/Ti
Zr		0.60

Mechanical Properties

Tensile strength	316～203	σb/MPa
Yield Strength	207	σ 0.2 ≥/MPa
Elongation	22	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	710～352	-
HRC	30	-

Physical Properties

Thermal expansion	34-76	e-6/K
Thermal conductivity	42-75	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	8476-1974	째C
Density	6265-6562	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)
S.124 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