Materials for GRAVITY cast pistons

Aluminum Alloys with Sylicon percentage

G-AlSi 12MgCuNi-P


Chemical composition in Pct (%)
Si Fe Cu Mn Mg Zn Ti Ni Pb Sn Sr ppm Ca ppm P ppm Na ppm OTH sing OTH tot
Min. 12,0 - 0,8 - 1,0 - - 1,0 - - - - 80 - - -
Max 13,0 0,3 1,5 0,1 1,5 0,10 0,10 1,3 0,05 0,05 5 10 120 5 0,05 0,15


Thermal expansion coefficient

Da/from 20°C  a/to   100 19,5 – 20,5 10-6°C-1

Da/from 20°C  a/to   200°C         20,5 – 21,5 10-6°C-1

Da/from 20°C  a/to   300°C         21,5 – 22,5 10-6°C-1

Physical properties

 

Specific weight

2,70 kg/dm3

Lowest/Highest melting point

535 / 590° C

Specific heat (a/at 100°C)

0,23 cal/g.°C


Thermal conductivity (a/at 20°C)

0,32 cal/s.cm°C

Modulus of elasticity (E)

75000 N/mm2

Heat Treatment

T5/T6

G-AlSi 18MgCuNi-P

Chemical composition in Pct (%)
Si Fe Cu Mn Mg Zn Ti Ni Pb Sn Sr ppm Ca ppm P ppm Na ppm OTH sing OTH tot
Min. 17,0 - 1,3 - 1,0 - - 0,8 - - - - 80 - - -
Max 19,0 0,3 1,7 0,1 1,5 0,10 0,10 1,3 0,05 0,05 5 10 130 5 0,05 0,15

Physical properties

 

Specific weight

2,68 kg/dm3

Lowest/Highes melting point

535 / 570° C

Specific heat (a/at 100°C)

0,23 cal/g.°C


Thermal conductivity (a/at 20°C)

143 W/mK

Modulus of elasticity (E)

83000 N/mm2

Heat Treatment

T5/T6

G-Alsi 21MgCuNi-P

Chemical composition in Pct (%)
Si Fe Cu Mn Mg Zn Ti Ni Pb Sn Sr ppm Ca ppm P ppm Na ppm OTH sing OTH tot
Min. 20 - 1,3 0,5 1,1 - - 1,2 - - - - 90 - - -
Max 22 0,3 1,5 0,8 1,5 0,10 0,20 1,6 0,05 0,05 - 10 150 5 0,05 0,15

Physical properties

 

Specific weight

2,66 kg/dm3

Lowest/Highes melting point

 

Specific heat (a/at 100°C)

 


Thermal conductivity (a/at 20°C)

145 W/mK

Modulus of elasticity (E)

83000 N/mm2

Heat Treatment

T5/T6