An Example in Steel CastingTraction Motor Rotor Disc
AISI-SAE
1023 Steel Alloy Composition
The OEM
specifications originally called for a low carbon steel (AISI-SAE
1015) based on the mechanical requirements. The
1015 alloy has a nominal % composition of--
0.13- 0.18 Carbon 0.30- 0.60
Manganese 0.040 Max
Phosphorus 0.050 Max Sulfur
But
that specific carbon level in the 1015 steel has insufficient fluidity at
the pour temperature for smooth and rapid metal flow into this
complex mold.
Huron Casting
suggested an alternate alloy (AISI-SAE 1020) with a higher carbon level
(0.17%-0.23%), but the same levels of manganese, phosphorus, and sulfur. There
is no loss of mechanical properties.
The higher
carbon level reduces the melt temperature and will give improved fluidity in the mold
at the pour temperature (2830F-2870F).
The
higher carbon content will increase fluidity and provide better fill in
thin wall sections of the mold.