pa1778data.pdf

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