AlSi7Mg03

ŒTypical Applications

Technical Data Sheet AlSi7Mg0.3

Universal alloy used for intricate castings with medium or thick walls for a wide range of technical application.Due to the Mg-content, very good mechanical properties can be achieved by heat treatment. Very goodcorrosion resistance and welding properties.

•Designations others than EN: nearest corresponding standard

EN 1676ChemicalNumericalAB-AlSi7Mg0.3

AB-42100

Hydro IMS4433xx

ItalyUNI8024

USAAAA356.2

FranceNFA-S7G03

UKBS 1490LM 25

GermanyDIN 1725-5GB-AlSi7Mg

ŽChemical Composition weight-% according to EN 1676, single values indicate maximum content

Si6.5-7.5

Fe0.15

Cu0.03

Mn0.10

Mg0.30-0.45

Cr-Ni-Zn0.07

Pb-Sn-Ti0.10-0.18

Others

Each

Total

0.030.10

•Mechanical Properties

The achievable mechanical properties are strongly dependent on the casting method applied. The tablerefers to typical properties obtained in sand casting (S) and gravity die casting (G). Values in bracketsindicate the minimum values according to EN 1706.

CastingmethodSSGG

TemperFT6FT6

Yield strengthRp0,2 [MPa]80-140 (-)190-260 (190)90-150 (-)210-280 (210)

Tensile strength

Rm [MPa]140-220 (-)230-320 (230)180-240 (-)250-340(290)

Elongation A5 [%]2-6 (-)3-6 (2)4-8 (-)5-9 (4)

Hardness [HB]45-60 (-)75-110 (75)50-65 (-)80-115 (90)

Fatigue strength50$106 [MPa]

60-8080-11070-9080-110

•Physical Properties typical values

Density[g/cm³]268,00

Young´smodulus[GPa]75

Lin. expansioncoeff. 20-200°C

[10-6/K]22

Thermalconductivity[W/(mK)]150-180

Electricalconductivity[m/(Ωmm²)]23-28

Solidifcationrange[°C]625-555

‘Other Properties ŸCastabilityŸShrinkage

ŸMachinabilityŸWeldability

ŸCorrosion resistanceŸSurface treatment’Melt Treatment

ŸModification with Na or Sr, especially for sand castings and thick-walled gravity die castings. The alloy canŸŸ

be premodified with Na, Sr, or Sb.

Grain refinement with Ti-B is recommended. Additions of Ti-B can also improve castability.Casting temperature: 680 to 750°C

Very good for sand, gravity die, and low pressure die casting, good for high pressure die casting

Sand casting: 1.1–1.2%; gravity die casting: 0.8–1.1%; high pressure die casting:0.5–0.7%Very goodVery good

Excellent, very good against sea water

Anodizing for surface protection, not used for decorative purposes.Can be polished for decorative purposes.

Primary FoundryAlloys

“Heat Treatment

Technical Data Sheet AlSi7Mg0.3

The standard heat treatment procedure for this alloy is solution treatment followed by artifical ageing, i.e. T6-conditions. The treatment time depends on the castings, for slowly solidified and thick walled castings, thelongest holding times (8-12h) are recommended.

ŸSolution treatment at 520-540°C for 4-12h. The temperatures should not exceed 550°C due to the risk ofŸŸ

local melting of low melting point phases.Quenching in water

Ageing at 155-165°C for 6-12h.

The combination of strength and ductility is determined by the ageing time. Decreasing treatment time ortemperature (T64-conditions) increase ductility at the expense of strength. If necessary, special heat treat-ment may be applied: stabilizing, soft annealing, stress relief annealing, or overageing.