Castasil

Castasil® – large components,
high dimensional stability, fantastic to cast
An alloy, produced for large, high pressure die cast structural parts in automotive body structures. Lamborghini produced the first series in the Gallardo Spyder. Numerous manufacturers now recognise the benefits of this alloy: high dimensional stability, can be used without heat treatment, shapes well and easy to weld.

Nature's equivalent: the vine branch which turns towards the sun, flexible, elastic and yet incredibly tough and strong.

Castasil-21 Castasil-37
Note technical information!

Castasil®-21 [ AlSi9Sr ]

Areas of use
Also for huge castings with requirements in terms of high thermal or electrical conductivity.
Conductor plate for electronics, automotive and mechanical engineering, LED-lighting, air cooling

Distinguishing characteristics
High pressure die casting alloy with high casting ability, optimized for high thermal or electrical conductivity. A casting treatment O gives highest conductivity compared with other AlSi-die casting alloys. Flangeable, very good corrosion resistance to weather.

Alloy denomination
Chemical denomination: AlSi9Sr



Composition [% of mass]

SiFeCuMnMgZnTiandere
8,0 – 9,00,5 – 0,70,020,010,030,070,01Sr
Mechanical properties

Casting
method
Treatment­
state
YTS
Rp0.2 [MPa]
UTS
Rm [MPa]
Elongation
A [%]
Brinell hardness
HBW
HPDCF90 – 100200 – 2306 – 960 – 70
HPDCO80 – 90170 – 1909 – 1455 – 65

Castasil®-37 [ AlSi9MnMoZr ]

Areas of use
Connection nodes for space frame designs; thin-walled body parts; architecture, cars, lighting, aircraft, domestic appliances, air conditioning, automotive engineering, foodstuffs industry, mechanical engineering, shipbuilding, defence engineering; replaces high pressure die castings with T7 or T6 air quenching.

Distinguishing characteristics
High pressure die casting alloy with excellent castability. Very high elongation in as-cast state as a result of which it can be used in more ways when in as-cast state. Further increase in ductility thanks to single-stage heat treatment. No distortion or blisters from solution heat treatment, very good corrosion resistance, no long-term ageing due to heat, good machinability.

Alloy denomination
Chemical denomination: AlSi9MnMoZr



Composition [ % of mass ]

SiFeCuMnMgZnMoZrother
8,5 – 10,50,150,050,35 – 0,60,060,070,1 – 0,30,1 – 0,3Sr
Mechanical properties

Casting
method
Treatment
state
Wall thickness
[mm]
Yield tensile strength
Rp0,2 [N/mm2]
Ultimate tensile strength
Rm [N/mm2]
Elongation
A [%]
High press. die castingF2 – 3120 – 150260 – 30010 – 14
High press. die castingF3 – 5100 – 130230 – 28010 – 14
High press. die castingF5 – 780 – 110200 – 25010 – 14