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ggg40
- Thread starter tocopeak
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I think you mean Grey cast iron grade 40 (40ksi UTS) likely a hypo eutectic grey iron, IE. 2.0%<C<4.3% some amounts of silicon and then some manganeese (to form MnS) and other common iron alloying elements. More important than chemistry with the grey irons is matrix microstructure and graphite morphology.
nick
nick
Hi
The chemical composisition to GGG 40 is function the your thickness.
But frequenttly the range of equivalent carbon is 4,2 to 4,4% because the graphite flotation and to the casting soundness this relation is a good information
% C + Si/7 > 3,9
The Manganese must be very low 0,20% max because your pearlt effect.
I use this comosition
C 3,40 a 3,60
Si 2,50 a 2,70
Mn0,20 max
P 0,05 max
S 0,01 max
Mg 0,03 a 0,08
Other informations please contact
Aguinaldo gonsalez
The chemical composisition to GGG 40 is function the your thickness.
But frequenttly the range of equivalent carbon is 4,2 to 4,4% because the graphite flotation and to the casting soundness this relation is a good information
% C + Si/7 > 3,9
The Manganese must be very low 0,20% max because your pearlt effect.
I use this comosition
C 3,40 a 3,60
Si 2,50 a 2,70
Mn0,20 max
P 0,05 max
S 0,01 max
Mg 0,03 a 0,08
Other informations please contact
Aguinaldo gonsalez
Carburize
Thanks for the clarification. I too was relating it to grey iron casting. Infact GG series is now grey iron and GGG is related to ductile irons. I have reproduced an extract in German giving mechanical properties of GGG 40. hope it is helpful.
Thanks once again.
Kennwerte für Gussteile aus Sandguss
GGG 40 0.7040
Lieferanten aus der CZ
Streckgrenze Rp 0,2 240 - 250 N/mm²
Zugfestigkeit RM 370 - 390 N/mm²
Bruchdehnung A5 12 - 15 %
Härte - HB
Dichte 7,20 g/cm³
Here is a translation into English of arunmrao's last post:
Nominal values for cast parts from sand casting
GGG40 0.7040
Suppliers of the CZ
Proof strength Rp0,2 240 - 250 N/mm2
Ultimate tensile strength RM 370 - 390 N/mm2
Fracture strain A5 12 - 15%
Hardness - HB
Density 7,20 g/cm3
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
Nominal values for cast parts from sand casting
GGG40 0.7040
Suppliers of the CZ
Proof strength Rp0,2 240 - 250 N/mm2
Ultimate tensile strength RM 370 - 390 N/mm2
Fracture strain A5 12 - 15%
Hardness - HB
Density 7,20 g/cm3
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
GGG 40 is Spheroidal Graphite iron (Ductile) casting.
More popularly known as SG iron.
The standard specification is BS EN 1563 released in the year 1997.
Chemical composition and hardness left to the discretion of the foundry if not specified by the purchaser.
Tensile 400 N/mm2
Elongation 15 %
0.2 % proof stress 250 N/mm2
Indian equivalent is IS 1865: 1991 grade SG 400/15
More popularly known as SG iron.
The standard specification is BS EN 1563 released in the year 1997.
Chemical composition and hardness left to the discretion of the foundry if not specified by the purchaser.
Tensile 400 N/mm2
Elongation 15 %
0.2 % proof stress 250 N/mm2
Indian equivalent is IS 1865: 1991 grade SG 400/15
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