pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
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U.S. STEEL DUQUESNE WORKS<br />
HAER No. PA-115<br />
(Page 216}<br />
of 70" with a maximum screw speed of 600" per minute. Product<br />
sizes from the 46" mill included up to 52" wide slabs with a<br />
minimum thickness of 3 1/2", bloom sizes up to 20" square and<br />
various breakdown sizes for subsequent rolling in the 36" mill.<br />
Product sizes down to 8" square could also be finished on the 46"<br />
mill when the 36" mill was rolling smaller sections.<br />
Following the exit end of the remains of the 4 6" mill roll<br />
stand, is a 78*-9" long mill run-out table. This table delivered<br />
the bloom or slab to the 63*-8 M long scarfer delivery table. The<br />
scarfer, manufactured by the Linde Division of the Union Carbide<br />
Corporation, is dismantled. By using a constant supply of air,<br />
fuel gas, and oxygen as cutting agents, it was capable of<br />
"scarfing," or removing surface defects on the bloom or slab at<br />
its edges only, top and bottom only, or on all four sides. An<br />
electrical precipitator, located due east of the scarfer on the<br />
outside eastern wall of the south motor room, cleaned waste gases<br />
from the scarfer.<br />
After passing through the scarfer, the bloom or slab moved<br />
to the 60'-5" long shear approach and entry table. The 46" x<br />
110" mill shear was manufactured by the Mesta Machine Company.<br />
The electrically driven, up-down cut type shear, was powered by<br />
four 500 hp motors. It was capable of shearing blooms or slabs<br />
with a maximum thickness of 22" to a maximum length of 20'-0" and<br />
a minimum length of 6 f -0". Crops from the shear were directed<br />
through scrap chutes into one of two 21-ton skip hoists which are<br />
located in a pit just west of the shear in the scrap and scale<br />
building. The skips eventually dumped the crops into charging<br />
boxes which were transferred to the plant's steelmaking<br />
facilities where the crops were used as revert scrap.<br />
Next in line is the 46" x 110" mill slab piler and transfer.<br />
The outlet for slabs and larger bloom sizes which were finished<br />
on the 46" mill, the elevator type piler was capable of piling to<br />
a maximum height of 3 *. It placed the slabs or blooms on a<br />
transfer car which travelled to the shipping building and were<br />
unloaded by a "C" hook equipped crane. On the north side of the<br />
piler is a pneumatic impact stamping machine. Operated by the<br />
piler-transfer operator, the machine was used to stamp<br />
identifying numbers on each slab or bloom.<br />
Blooms which were slated to be rolled into smaller sizes<br />
passed directly from the 46" x 110" mill shear to the 36" x 78"<br />
2-high reversing blooming mill. Manufactured by the Birdsboro<br />
Company and powered by two 3 000 hp motors, the mill was capable<br />
of producing blooms or billets in square or round shapes ranging<br />
in size from 15" to 4 9/16". Only the housing for the rolls<br />
remains in place. The top roll, when in place, had a maximum