Jinzhou Sata Fused Fluxes and New Materials Factory.
AlSr Modifiers
AlSr Modifiers
General Introduction:
For foundry alloys an important master alloy is the Aluminium-Strontium or AlSr "Modifier". It usually added into molten Al-Si alloys. which improves the mechanical properties involving elongation rate and impact resistance of both casting and heat treated Al-Si series alloys.

The eutectic silicon and the hypoeutectic silicon use Alsr to proceed the modification, which can transform the thick massive eutectic silicon to the tiny fibrous structure, hinder the growth of silicon so as to improve the mechanical properties of the the alloys (change the fine pores into micropores)



Composition

Percentage of element(%)

Si

Fe

Mg

Ba

Ca

P

Sr

Impurity content

Al

single

total

AlSr5

0.2

0.3

0.05

0.1

0.03

0.01

4.0~6.0

0.05

0.15

Balance

AlSr10

0.2

0.3

0.05

0.1

0.03

0.01

9.0~11.0

0.05

0.15

Balance

AlSr20

0.2

0.3

0.05

0.1

0.03

0.01

18.0~22.0

0.05

0.15

Balance


Product name

Type

Composition(others are Al)

Aluminium strontium alloy


AlSr5

Sr 4.5-5-5%,Si0.2%max,Fe0.3%max

AlSr10

Sr 9-11%,Si0.2%max,Fe0.3%max

AlSr15

Sr 14-16%,Si0.2%max,Fe0.3%max

AlSr20

Sr 18-22%,Si0.2%max,Fe0.3%max


Advantages:
When adding Sr in the form of master alloy,it has better performance.
The activity of Sr is weaker than Na, so it is more secure and simple when adding the melt. And can also reduce the sodium corrosion to the melt lining
Sr is as a kind of effective inoculant, the metamorphic effect fall off the the minimum after melting many times, and also can maintain the good effect.

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