pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
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U.S. STEEL DUQUESNE WORKS<br />
HAER No. PA-115<br />
(Page 217)<br />
lift of 40" and a maximum screw speed of 400" per minute.<br />
The 1000 ton 3 6" mill shear is next in line. The open-sided<br />
shear was electrically driven through an air operated clutch and<br />
flywheel combination. Crops from the shear were directed to<br />
chutes into one of two self dumping boxes which are set in a pit<br />
on the western side of the shear. The sheared product requiring<br />
no further rolling was pushed onto a rope-driven transfer table<br />
which is located just north of the shear on its western side.<br />
The table transferred the blooms to the shipping building where<br />
they were unloaded by a "C" hook equipped crane.<br />
A 72" hot saw is located just north of the 36" mill<br />
transfer. Used for securing metallurgical tests, blooms were<br />
routed to the saw by means of an air operated diverter which<br />
could also return them to the transfer table after testing.<br />
Next in line is the 21" mill transfer table. The electric<br />
powered table, which is partially dismantled, diverted products<br />
in need of further working from the 36" mill to either the hot<br />
saw line on the western side of the building or to the 21"<br />
continuous billet mill on the eastern side of the building.<br />
Blooms requiring perfectly level ends were diverted to the hot<br />
saws. These included square blooms that were to be shipped to<br />
customers for subsequent forging and rounds which were used to<br />
make seamless pipe. The completely intact hot saw line consists<br />
of four rotary saws laid out in two lines—one stationary saw and<br />
one travelling saw in each line. Built by the United Engineering<br />
and Foundry Company, each saw was powered by two 800 hp motors.<br />
The length of travel of the travelling saws was 32'. The range<br />
of lengths that each saw was able to cut was from 10' to 32 1 .<br />
The 21" continuous billet mill is also completely intact.<br />
First in line is a 175-ton electric powered swinging crop shear.<br />
It was used to crop the front end of the entering bloom. The<br />
crops were directed into a pit on the western side of the line by<br />
means of a chute to a crop bucket which was removed periodically<br />
by crane. Following the crop shear is an air-operated billet<br />
turner which rotated blooms on the diamond for entry into the<br />
first pass of the mill. The 21" x 42" continuous billet mill,<br />
which is next in line, is a 4-stand mill with alternate vertical<br />
and horizontal rolls. Each stand is powered by a 1500 hp motor.<br />
Manufactured by the United Engineering and Foundry Company, the<br />
mill produced billets ranging in size from 1 3/4" to 4 9/16"<br />
square.<br />
Following the continuous billet mill is the electric<br />
powered, 137.5-ton, 21" flying shear. Built by the Morgan<br />
Construction Company, the shear cut the billets into lengths from