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251 A 58

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England B.S. 251A58 Specification for wrought steels for mechanical and allied engineering purposes. Requirements for steels for the manufacture of hot formed springs and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 251A58 / 251 A 58
Category Grade Standard Region/Area Standard Content
Metals 251 A 58 BS 970-2 England Specification for wrought steels for mechanical and allied engineering purposes. Requirements for steels for the manufacture of hot formed springs

Chemical composition(mass fraction)(wt.%) of the 251 A 58

Element Min Max Similar
Si 1.8000 2.1000 -
S - 0.0350 -
P - 0.0350 -
Ni - 0.4000 -
Mo - 0.1000 -
Mn 0.8000 1.0000 -
Cu - 0.3500 -
Cr 0.1500 0.3000 -
C 0.5500 0.6000 -

Mechanical Properties of steel grade 251 A 58

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)
342 (≥) 574 (≥) 14 24 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 343

Physical Properties of steel grade 251 A 58

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
34 - -     0.23 -  
891 921 - 23.3 441   -  
356 - 13 44.2   131 131

Heat Treatment of steel grade 251 A 58

Heat treated : 1215°C - 1415°C

Technological Curves of steel grade 251 A 58

Cross Reference Table (Equivalent Grade) of 251 A 58

Grade Standard Country Application
ASTM 5140
AISI 201
AISI 202
1.2767
17-4PH
AISI 1052
AISI 416Se
AISI 1330
AISI 205 Stainless Steel
AISI A10
AISI A2
AISI A3
AISI A4
1.0036
1.0037
SAE J403
UNS G10100
AMS 4924
ASTM A36
Electrode 100S-1
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