Mg treatment

Mg Treatment 1) First treatment Ladle after lining should have Height to Diameter ratio minimum 3:1 2) Pouring time, I start counting after reaction is over. It is 6 minutes 3) FeSiMg addition is 1.1% (6-7 Mg grade).

4) Pouring time can be increased by increasing FeSiMg addition and covering steel addition 5) Use of Tundish will give more clean metal and one can reduce FeSiMg addition.

But may have to increase Pouring temperature as Tundish cover is cold and metal has to heat it also 6) FeSiMg addition reduction is possible gradually. But good ladle maintenance ( free from slag) and pocket dimensions have to be maintained. Reaction time also to be monitored.

Cost of one or two heats bad microstructure ( faded castings) casting rejection is more than saving in the cost of FeSiMg in a month.

7) Only thing one has to see that (1) There should not be fines (2) No slag contamination on FesiMg lumps 8) For 500 kg treatment 5-15 mm size, and for 1000 kg treatment 10-25 mm is ok 9) Most imp is covering and pocking.

10) Make, fabricated metallic former with handle to measure pocket size 11) Cerium base alloy gives Exploded graphite, if cerium level in casting exceeds 0.02%. Safety limit is 0.015%. So lanthanum base alloys are becoming popular 12) Lamg 3 contains lanthanum and cerium 13) Volume of fresh made Pocket should be 1.25 times volume of Mg alloy plus covering...

This cavity generally does not get clogged with slag...