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Description

684 High Alloy and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:High Alloy: 684
Category Type Steel Grade Standard Country Application
Steel GradesHigh Alloy 684
670
R30605
671
R30816
680
N06002
681
682
683
N07041

Chemical composition(mass fraction)(wt.%) of the 684

C
Si
Mn
P
S
Cr Ni
0.10 0.10 0.10     17.50 ...
Mo Al Cu Nb Ti V Ce
4.25 3.00     3.00    
N Co Pb B Other Approximate rnumbe  
  18.45   0.005 Fe0.50 U500  
             

Mechanical Properties of steel grade 684

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)
116 (≥) 359 (≥) 14 42 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 344

Physical Properties of steel grade 684

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
44 - -     0.13 -  
341 244 - 24.3 222   -  
412 - 14 13.2   123 114

Heat Treatment of steel grade 684

Heat treated : 1313°C - 1222°C

Technological Curves of steel grade 684

Cross Reference Table (Equivalent Grade) of 684

Grade Standard Country Application
AISI 684 AISI USA precipitation hardening
GH738(GH684) China wrought Fe/Ni-base superalloy

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