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S 120

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England B.S. S120 Specification for aircraft material. 2½ per cent nickel-chromium-molybdenum steel (oil hardening) (100 tonf/sq in: limiting ruling section 2½ in) and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: S120 / S 120
Category Grade Standard Region/Area Standard Content
Metals S 120 BS 2S 120 England Specification for aircraft material. 2½ per cent nickel-chromium-molybdenum steel (oil hardening) (100 tonf/sq in: limiting ruling section 2½ in)

Chemical composition(mass fraction)(wt.%) of the S 120

Element Min Max Similar
Si 0.1500 0.3500 -
S - 0.0200 -
P - 0.0250 -
Ni 2.3000 2.8000 -
Mo 0.4500 0.6500 -
Mn 0.4500 0.7000 -
Cr 0.5000 0.8000 -
C 0.2700 0.3500 -

Mechanical Properties of steel grade S 120

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)
128 (≥) 133 (≥) 13 43 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 442

Physical Properties of steel grade S 120

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 - -     0.44 -  
761 948 - 41.3 144   -  
389 - 34 32.2   333 322

Heat Treatment of steel grade S 120

Heat treated : 1554°C - 1768°C

Technological Curves of steel grade S 120

Cross Reference Table (Equivalent Grade) of S 120

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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