The Manufacture of Iron And Steel a Handbook for Engineering Students Merchan
The Manufacture of Iron And Steel a Handbook for Engineering Students Merchan
H R Hearson
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In this case more THE BASIC OPEN-HEARTH PROCESS 55 lime is added, and some hot pig iron is charged in order to again get the metal " on the boil. " Samples are taken from the furnace at intervals, and when they are cooled and broken it can be seen by the appearance of the fracture to what extent the phos- phorus has been eliminated. At the end of the process the slag should be as non- oxidising as possible, as, if too much oxygen is present, the metal cannot be quietly teemed. The elimination o...f much sulphur cannot be relied upon, and for this reason a pig iron with a small per- centage of sulphur should be selected. Manganese, during the process, has some slight effect in eliminating sulphur, and when the spiegeleisen or ferro-manganese is added, there is a further small reduc- tion of sulphur. To convert the iron into steel, spiegel or ferro is added as in the Siemens acid process. It is not intended that the basic material with which the furnace is lined shall be used as a base to absorb the acids, silica and phosphoric acid lime is added to prevent that; but the lining becomes gradually worn and damaged, and new layers of basic material are occasionally required.
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