Based on the greenness idea

the greenization planning on the hypoeutectic cast Al-Si alloy is provided. There are a great many of Al-Si alloy grades at present.

for example

11 grades in China

14 grades in USA

16 grades in Russian

11 grades in Japan. It is found that most of mechanical properties of the alloys are covered each other. There are much trouble with materials selection

processing

management and recovery. To solved above problems

two grades groups would be planned. One of the alloy is low cost with middle mechanical properties（σ b=150～200 MPa

δ 5=1.0%～4.0%

e. g.

A356.0 in USA or ZL101 in China）while the other alloy is middle cost with higher mechanical properties （σ b=200～420 MPa

δ 5=2.0%～8.0%

e. g.

ZL120 in China）.