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the manufacture of alloys.
305
At Guldsmedshyttan an electric furnace of about the same type as the
Rennerfelt-furnace has been running since 1913, producing steel specially
for steel-castings.
The Manufacture of Alloys.
The electric manufacture of certain allos^s used chiefly in the iron
industry has been carried on in Sweden since 1904. For this purpose
electrode furnaces of the same type as those used in the carbide industry
are employed.
The places where this manufacture exists are Domnarvet, Gullspång,
Kortfors, Månsbo, Sandsta (near Hagge), Trollhättan and Vargön (near
Vänersborg). At present (February 1913) there are at these places 1, 6,
2, 1. 1, 3, 6 furnaces respectively in work.
The output has been as follows (approximate figures):
Year Ferro-silicon Manganese-silicon
Tons Tons
1904 ......... 225 —
1905 .......... 230 3
1906 .......... 665 —
1907 .......... 950 —
1908 .......... 1077 25
1909 .......... 2 524 —
1910 .......... 4 570 186
1911 ......... 4104 472
1912 .......... 5 984 1028
191 3.......... 9 803 1375
At Månsbo since 1901 about 25 tons of 15 per cent ferro-silicon has been
yielded per year as a by-product in the manufacture of calcium carbide.
At the Sandsta furnace, which was started in the middle of August 1912, is
manufactured a potashiferous manure (electro-potash), in which ferro-silicon is
obtained as a by-product.
The ferro-silicon contains from 12 to 96 %, as a rule about 50 °/o of
silicon, and the manganese-silicon contains from 20 to 30 % of silicon
and 70 down to 50 % of manganese.
The manufacture of other alloys, such as manganese iron and chrome
iron has also occurred sporadically; at present there is a factory at work
at Trollhättan, where the last-named allo3^ is manufactured in electric
furnaces. In 1913 760 tons of chrome iron and 136 tons of
silico-man-ganese-aluminium-iron were produced in Sweden.
During the years from 1885 to 1907 chrome-pig-iron was made at
Gothenburg in a furnace of the Wittenström type heated with masut.
20—133179. Sweden II.
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