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Sunday, September 25, 2011

Casting aluminium alloys

Casting aluminium alloys are intended for the production of parts, possessing low density (2500-2800 kg/m3) and high specific strength that allows in some cases to apply castings instead of die and hand forgings. Hence, the metal utilization efficiency ratio is increased but the labour-intensiveness is decreased during the part production process.
L4MS high-strength and high-technology alloy (Al-Si-Cu-Mg system) ensures σb=360-400 MPa, δ≥4% during the chill casting, it is not susceptible to crack initiation, the operation temperature is 250°C, hence, it's possible to cast parts by any method, including the advanced cavityless casting method.

VAL12 high-strength alloy (Al-Zn-Mg-Cu system) is used for the chill casting and squeeze casting; the operation temperature is 250°C (long-term) and 300°C (short-term), with σb≥550 MPa, δ≥3%.

VAL14 and VAL18 high-temperature alloys (Al-Cu-Mn system) are used for the sand casting of highly loaded parts, operated at the temperatures of 300-350°C, with σb=380-500 MPa, δ=7.5-10%, =60 MPa, =34 MPa.

VAL16 corrosion-resistant weldable (σb weld=240 MPa) casting aluminium alloy (Al-Mg system) is used at the temperature range of (-70+140) °C (long-term) and to 150°C (short-term).
Shaped aluminium castings
 Aggregate case
  Branch pipe

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