Alloys or metallic compositions – Ferrous – 1.7 percent or more carbon containing
Patent
1989-01-24
1990-04-03
Rosenberg, Peter D.
Alloys or metallic compositions
Ferrous
1.7 percent or more carbon containing
420129, C22C 3300
Patent
active
049138782
ABSTRACT:
In the manufacture of ductile iron it is important to know that the magnesium content is above (or possibly below) a threshold value. It is known that the presence of magnesium prevents tellurium causing solidification of a sample with carbidic eutectic arrest. Accordingly we treat a sample in a receptacle with a known quantity of sulphur (or selenium) such as just to neutralize the threshold quantity of magnesium, then we observe whether, on solidification, the eutectic arrest is graphitic (indicating that more than the threshold quantity of magnesium is present) or carbidic, indicating less magnesium. The observation is most simply done (and can be done semi-automatically) by timing a cooling curve between two predetermined temperatures.
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Dawson John V.
White Peter
General Signal Corporation
Hubbard Robert R.
Rosenberg Peter D.
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