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HR251 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of HR251

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B.S. HR251

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This page is mainly introduced the HR251 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of HR251,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Specification for heat-resisting alloy plate, sheet and strip (Ni 25.5, Cr 14.7, Ti 1.8, Mn 1.5, Mo 1.2, V 0.3, Fe remainder)

Steel Garde:HR251
Type:Stainless Steels
Country:UK
Standard:B.S.

Standard Number:

ITEM	Standard Number	Descriptions
1	BS HR 251 (1974)	Specification for heat-resisting alloy plate, sheet and strip (Ni 25.5, Cr 14.7, Ti 1.8, Mn 1.5, Mo 1.2, V 0.3, Fe remainder)

Application:Specification for heat-resisting alloy plate, sheet and strip (Ni 25.5, Cr 14.7, Ti 1.8, Mn 1.5, Mo 1.2, V 0.3, Fe remainder)

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C		0.06
Si		0.50
Mn		2.00
P		0.020
S		0.015
Cr	13.50	16.00
Ni	24.00	27.00
Mo	1.00	1.50
Co
Ti	1.70	2.00
Fe		remaining
Al		0.35
V	1.70	2.00
B	0.003	0.010
Pb		0.005

Mechanical Properties

Tensile strength	253～058	σb/MPa
Yield Strength	114	σ 0.2 ≥/MPa
Elongation	32	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	618～187	-
HRC	30	-

Physical Properties

Thermal expansion	59-70	e-6/K
Thermal conductivity	32-87	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	0345-5350	째C
Density	6832-0452	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)
HR251 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