The sun. [volume] (New York [N.Y.]) 1833-1916, 1892-06-13

ing best the requirements Of gun steel was q
forged steel Of mild quality. treated as follows.
viz: After forging. the metal was annealed to
relieve it from the strains produced BY ham,
mering: it was then tempered In oil and again
snnealed to relieve the tensions in
duced by the tempering. Tho result
ing metal possessed q high tensile strength
and elastic limit. with q very considerable de-
gree Of ductility. thereby securing the impor-
tant quality OF toughness. Anumber Of fail
ures had resulted from the use OF simply oil
tempered steel and the beneficial effect Of
that treatment was regarded with suspicion.
30 that the Navy felt justified in specifying
that the steel for the 6-inch guns under
their contract with tho Midvale Steel Works
should be simply annealed. It was In tho
combination OF the two modes OF treatment.
however. that the way was opened for the
great progress that has since been made In
the production OF gun steel.
As q result OF its investigations the Ordnance
Department issued q circular. under date OF
April. 1888. to about twenty Of the steel works
In this country. describing the character OF
the metal required in gun forgings. tho pro-
eesses to be followed in Its treatment and the
physical qualities to be expected therefrom.
and invited their cooperation in working up
steel OF the desired quality. giving also tho
dimensions for forgings i'm m ediately required.
With the exception Of one or two. none were
In condition to respond to this overture from
the department The Midvale Steel Works offer
ID to undertake the fabrication OF steel hoops.
but had not the capacity for producing the tube
and jacket forgngs. These heavier forgings
were. accordingly. ordered from abroad. I'M
dor the specifications prescribed by the de-
partment for oil-tempered and annenled STEEL
na preliminary 70 Tue manuiae.ute . ~ noop'
quantity the department ordered 1 .hses s. ea
w. "a, IL, ,onns 80 ,o-aa ooiihro ona
MoiNs-two rol4eu hoops OF iarSe eailo i. ohe
,nnsaled. and one smaller hamm cred hoop for
.Hne",eu, ~uu one -, Sm . n na 49,
~ e-lhch gun. oii,,enpeieu Anu 1 annae ~
M orsinaru ,rav NV rraons y, anacjmena
M ~ ~ .hsnni. ,non o.st-;ron
cylinders. using different degrees OF shrink
.se to test thoroughly their resistance and
strength The results demonstrated the great
superiority OF the oil-tcmpered and annealed
stsa, ria rneults wa nrh,isbod IN "Notse
onConstruction OF Ordnance. No. 70. and gave
much valuable information with respect to the
most suitable qualities and the mode of pro.
auction OF gun steel. These processes are now
employed in the manufacture OF gun steel for
hotb .r,,r a., y. 49, - L. $1,000,
use in otbs ano nnyy ana are also IN eeherA
IN S,;ls III reaa a m' Mrnkagss 20 oe t1nosoSea
partmept had IN s onseIs ~ ir tns tbe
ss" SS ,re en- ahI spanish, and pHDlismea
sna,v,ioeess On me 1ohstructioh OF Ornnahce.
taininu % hNestshtlohs una IHIMuias per-
and aSn W Tue Duiiulhg up OF holloW cyllnaefs
sscu,S Sns' Uut hotninG was known as 70 their
lccuracy IN IN prsftiGai va,ue, o: tne limits 81
machinirua W, Sncn II was necessary 10 work IN
ingy the dam a,rs lf' t re n cc0u
from the on .,partment adopted tne practlce
type of onn s'eet' IN tne case Q! each DISTINCT
ages nrnna n, az assembling with the SHRINK
rsnrss nrVPosed Tor the gun short cylinder.
poEder nhnSTd asc,lpn oi tns gun tnrouGh the
H. In ,hia ~ anu atelwaIu uisinantiing
Of the n-anticaM W. y, ~ va thanlen 10 )ildee
cidentallv :" snrir y VIZ ,urih ulas. ana. IN.
great value reiatiye ~ the ,'iHit,nat9h OF
don With thes a. vmn Tpera IN connsc-
Generally re'eiynd t'rmui a., ! VISION ~ the
made, correcting nyiIanf ,.r r Tn''hNags was
their scope and puttinr them in n ra emu ,glng