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Iron-Silicon Based Master Alloys With Rare-Earth Metals
To Specification TY 14-5-136-81
Microalloying of steel with rare-earth metals improves
cold resistance and reduces anisotropy of deformed steel's properties.
The use of rare-earth metals is effective for welded steels characterized
by the combination of cast and deformed structures in the weld area
and tending to lamination.
Ultimate strength of cast iron with globular graphite modified with
rare-earth metals is 2-3 times higher than that of grey cast iron.
Small additions (0.03-0.05% of rare-earth metals) to cast iron allow
to produce thin-walled castings without chill.
Used to alloy light aluminium and magnesium based non-ferrous alloys,
improve rupture strength, vibration and corrosion resistance without
the increase in electrical resistance.
Chemical composition
| Grade |
Chemical composition, % |
| Rare Earth Metals |
Si |
Al |
Fe |
| cl. A |
cl. B |
| شر30ذاج30 |
30-40 |
30-50 |
2-5 |
5-15 |
balance |
| شر30ذاج20 |
20-30 |
30-55 |
2-5 |
5-15 |
balance |
| شر30ذاج15 |
15-20 |
30-60 |
2-5 |
5-15 |
balance |
| شر30ذاج10 |
10-15 |
30-60 |
2-5 |
5-15 |
balance |
| شر30ذاج5 |
5-10 |
30-60 |
2-5 |
5-15 |
balance |
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Typical composition
| Grade |
Typical composition, % |
| Rare Earth Metals |
Si |
Al |
Fe |
| cl. A |
cl. B |
| شر30ذاج30 |
35,3 |
40,1 |
4,4 |
9,3 |
balance |
| شر30ذاج20 |
29 |
41,7 |
4,4 |
8,6 |
balance |
| شر30ذاج10 |
13 |
45,9 |
4,4 |
7,5 |
balance |
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In master alloys of all grades the following percentages
by mass are permitted:
- magnesium - up to 1.5%;
- carbon - up to 0.5%;
- copper - up to 2.5%;
- calcium - 0.5-6%.
By agreement with the customer, in grade شراخذ3ج5 the total
content of rare-earth metals of less than 5% is permitted.
Supplied in lumps of not more than 10 kg, packed in steel drums.
Density 3,5 -4,5 g/cm3.
melting point 1250-1400 °C.
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