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HR251

Favorite Datasheet
HR240 2HR401
#HR251

Description

UK B.S. BS HR 251 (1974), HR251 Specialsteel 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) and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Specialsteel: HR251
Category Class Grade Standard Country Application
Steel GradesSpecialsteel HR251 B.S. UK 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.%) of the HR251

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

Mechanical Properties of steel grade HR251

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV/Ku (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition Brinell hardness (HBW)
419 (≥) 776 (≥) 31 23 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 334

Physical Properties of steel grade HR251

Temperature
(°C)		 Modulus of elasticity
(GPa)		 Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)		 Specific thermal capacity
(J/kg·°C)		 Specific electrical resistivity
(Ω mm²/m)		 Density
(kg/dm³)		 Poisson’s coefficient, ν
31 - -     0.13 -  
785 111 - 24.3 341   -  
543 - 33 24.2   331 124

Heat Treatment of steel grade HR251

Heat treated : 1738°C - 1237°C

Technological Curves of steel grade HR251

Relevant standard of HR251

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) BS-HR-251-(1974).pdf
HR240 2HR401
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