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8640

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America SAE 8640 Chemical compositions of SAE alloy steels and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 8640 / 8640
Category Grade Standard Region/Area Standard Content
Metals 8640 SAE J 404 America Chemical compositions of SAE alloy steels

Chemical composition(mass fraction)(wt.%) of the 8640

Element Min Max Similar
Si 0.1500 0.3500 -
S - 0.0400 -
P - 0.0350 -
Ni 0.4000 0.7000 -
Mo 0.1500 0.2500 -
Mn 0.7500 1.0000 -
Cu - 0.3500 -
Cr 0.4000 0.6000 -
C 0.3800 0.4300 -
Si 0.1500 0.3500 -
S - 0.0400 -
Pb 0.1500 0.3500 -
P - 0.0300 -
Ni 0.4000 0.7000 -
Mo 0.1500 0.2500 -
Mn 0.7500 1.0000 -
Cu - 0.3500 -
Cr 0.4000 0.6000 -
C 0.3800 0.4300 -

Mechanical Properties of steel grade 8640

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)
771 (≥) 249 (≥) 11 32 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 211

Physical Properties of steel grade 8640

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
41 - -     0.43 -  
287 893 - 13.3 333   -  
493 - 41 33.2   414 424

Heat Treatment of steel grade 8640

Heat treated : 1581°C - 1768°C

Technological Curves of steel grade 8640

Cross Reference Table (Equivalent Grade) of 8640

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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