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FAGERSTA BRUKS AKTIEBOLAG
127
three blast furnaces at Fagersta were started in 1915 and are of the most up-to-date
construction. Their total output is from 35,000 to 40,000 tons. The main part of the pig
iron produced is used by the works themselves for iron and steel-making, but rather large
quantities are also sold to other steel and iron Works. In addition, there is put on the
©/
, which is made in 5 different qualities with a
Siliconpercentage up to 5*5%. This foundry pig iron has obtained general recognition as
being of the same good quality as that characterising all of the Fagersta productions.
THE STEEL WORKS
consist of 7 Siemens-Martin furnaces besides electric furnaces. The first Simens-Martin
furnace was completed in 1884. These furnaces, most of which have a capacity of 10
or 15 tons, have a total output of 60,000 tons of ingots per year. Two electric steel
furnaces manufacture high speed steel and other kinds of special steel.
The following is a table showing the mechanical properties of Fagersta Special
Steel: Diameter of test piece 15 mm (3/5 inch.) Measured length 150 mm (6 inch.)
Tor» ail ^ Elongation
Ox , , n A Elastic limit , ?! ,––––––––––––––––––- Contraction
Steel for Treatment , strength kg j mm 50 mm %
___________________________________________________per mm2 (6in>)Q/0 (2 in.) %______________
Motor-car springs annealed 68’3 97’3 13"3 23*0 40
» » » heattreated 1631 184’2 2’3 5’0 11
» » cog-wheel » 1161 132’3 10*0 21’9 50
» » steel »> 81-6 97’0 10*0 22’2 55
» » » » 116’3 124’0 8’4 16*6 41
» » » » 106’0 1141 8’3 18’0 57
» » .> » 170’0 185-2 5-0 11-6 4
» » » annealed 64’0 92’1 13’3 18’0 33
Springs » 60’0 92’6 14’6 25’0 40
» heattreated - 201’6 1*0 3’0 6
Gun-barrels » 105.1 109’2 10*0 20’0 49
» » » 93-1 98’9 12-3 20*8 41
Quick-firing guns » 85’5 101*0 H’4 23’0 56
Machine guns » 97’4 114’8 9’4 16’0 36
Projectiles annealed 58’9 881 14*1 26’0 59
Projectiles heattreated 167’0 177’3 4’3 12*0 41
» brisante shells annealed 69*0 109’5 ll’O 21*8 45
» » » » 48’2 811 16’2 24’6 58
» » » heattreated 205’2 212’0 31 6’2 11
» » » » 1711 200-2 2-0 3.8 8
For Case hardening » 68*3 78’2 14’0 28’4 66 I
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