Full resolution (JPEG) - On this page / på denna sida - VI. Mining and Metallurgical Industry. General Survey. By C. Sahlin - 2. Iron and Steel Industry. By J. A. Leffler
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
-298
vi. mining and metallurgical industry.
Output of Acid and Basic Open Hearth and Bessemer Steel in Sweden.
1 000 tons.
Tear 1891 95
____basic } ®Pen Hearth Steel (Siemens-Martin Steel).
–––––acid 1
–––-basic I
10 1912
Bessemer Steel.
The Acid Bessemer Process. In the acid Bessemer process, as carried on in
Sweden, is employed a pig iron containing from 2 to 3 % of manganese and
from 0*8 to l’l % of silicon. The sulphur-content is about O’oio % and under,
and the proportion of phosphorus O020 to 0’030 %. The most distinctive feature
of the acid process is the relatively high manganese-content and the relatively
low silicon-content and, as regards the actual operation, that the pig iron
is taken in a molten condition direct from the blast furnace to the converter,
thus without previous remelting in a cupola furnace.
Bessemer pig iron, being taken direct from the blast furnace to the converter,
demands particularly great care in the making, inasmuch as disturbances in the
running of the blast furnace directly affect the composition of the pig iron and
its temperature, and thus indirectly the blowing operation and the quality of
the steel.
The Basic Bessemer Process. In the Swedish acid process the silicon in the
pig iron is the real generator of heat, though quite a respectable additional
amount is supplied by the manganese. In the basic process, on the other hand,
<< prev. page << föreg. sida << >> nästa sida >> next page >>
