Bisbee daily review. [volume] (Bisbee, Ariz.) 1901-1971, 1913-05-04

MUCH TOLD BY
RECENT TRIALS

Iron ore prints in its current mum
Der the following highly interesting
article:
We have been hearing something
about the Introduction Of copper IN
the manufacture OF steel rails. and
We are apt TO hear more Of il IN steel
sheets. The American Sheet and Tin
Plate company has been conducting a
series OF tests TO learn what benefits,
if any could be derived from the inject
ion OF copper in steel sheets. Mr..
Dudley n. Buck, the company's chem.
list at the Demmler laboratory. Pa,
in paper recently read before the
American Chemical society, at Nil.
waukee Wis, presented the following
points which many readers of Iron
Ore will be interested in.
In order 10 establish the value OF
copper in steel when exposed to ma.
tural cOTrOsiOn and under atmospher.
ic conditions a series OF tests was IN
dertaEen by the writer. in order TO
make the test pieces absolutely iden-
teal except for copper content. 1t
was decided TO copperize portions of
steel heats. Three heats were used ::
Irregular basic open-hearth.
2.-Easic open-hearth, rephosphor-
lied.
Irregular Bessemer. .....
In pouring each of the three heats
several ingots were poured. some be-
ing copperized to give about 10 per
cent and others to give about % per
cent copper. Thus in each Of three
heats classes Of steel were produced
making nine descriptions. In each
case some steel was folled into 16
gauge and some into n gauge, 39x96,
so that is lots of steel sheets were pro
dueed for testing.
Three Testing st7tions.
Three testing stat 'ons were select
ed some sheets from each of the IS
lots being exposed at each. Skeleton
wo0den buildings we're erected with
a 40xS0 foot roof. about Is degrees.
the lower side being about six feet
from the ground, the building entire
ly omen on the four sides. The three
locations were:
1.-Pennsyiyania coke regions, with
sulphurous and sulnhuric acids and
other fumes from the coke ovens. in
protected, corrode very fast.
2.-Sea coast, the air carrying So
dun chloride
S.-Ordinary rural community, pure
air
The sheets were placed on these
roofs during November, 1911. entirely
unprotected BY paint or other cover
ing, except for. the thin film of oxide
always present on an annealed sheet.
Sheets Of the nine. classes in G6
gauge were placed on oue-half roof,
and corresponding sheets Of p gauge
on the other half
Boosts for Cooper Sheets.
Within a short time after zorro.
sion had started, the higher copper
steels We're showing considerable
advantage. The non-copper steels he.
came rough to the touch, and eEamin,
alton under the rust gave evidence OF
well developed pitting. The low COP
per steels .07 per cent copper. were
not quite so rough, while those with
10 TO "a per cent COPPER were fairly
smooth TO the touch, with scarcely ans
pitting
Twelve months Of the coke region
TOOL ulduS several u LEt hOU-tpDDtl
steel material disappear entirely
while an inspection in March. 1912
showed the copper bearing steel
sheets still in place.
After ten months the seashore rooi
showed substantially the same condi
tons as the coke region roof had
shown several months earlier The
rural district Jared best Of all through
out the non-copDer steel only nov
failing, in the q gauge while the Low
copper steel is in poorer condition
than the high copper steel
Tests by Weight.
From the sheets before corrugatior
there were cut pieces 2x4 inches
which were carefully weighed and
then exposed in racks at the three
stations. After certain OF the tes
pieces had rusted through. the set
were taken down and weighed aftel
removal of rust by ammonium citrate
The weights were then tsbulated anC
arranged TO show relative values, OF
basis of 100 for the greatest amour
Of corros' on at each station. Thii
tsbulation shows in every case tina
the steels with copper additions de