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Патент USA US2067631

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Patented Jan. 12,, 1937
2,067,631
. UNITED STATES
PATENT OFFICE
2,067,631
WELDING ROD
Frederick M. Becket, New York, and- Russell
Franks, Jackson Heights, N. Y., 'assignors, by
-
11188118
assignments, to Union Carbide and
Carbon Corporation, a corporation of New
York
No Drawing. Application July 23. 1934,
Serial No. 737,380
_
(Ul- 219-8)
2 Claims.
The invention is an alloy steel welding rod.
temperatures between ‘300° C. and 850° C. for
Application Serial Number 593,928, ?led Feb-, various
lengths of time, a separate sample being
' ruary 18, 1932, by Frederick M. Becket and Russell
‘ Franks jointly, contains a description of chromi
“10
used for each combination of temperature and
time. After a sample was held at a given tem
perature for a given length of time it was boiled
in an acidi?ed copper sulfate solution in an at
um-nickel steels containing additions of colum
bium acting to lessen material loss of corrosion
resistance on prolonged holding at elevated tem
peratures in the neighborhood of 500° 0.
We have found that steels containing colum
tempt to disintegrate it by intergranular cor
rosion.
Table B
bium tend to lose excessive amounts of this con- '
10
stituent when melted by an oxyacetylene torch or
an electric arc during welding operations unless
'the material contains an effective amount of sili
con. The following table (A) of test data serves to
illustrate this fact. The welds in these tests were
.
Analysis
Steel N0
Percent Percent Percent Percent Percent Percent
C‘r
i
n
b
_
'
18.49
19.45
8.81
8.
38
0.85
0.57
0.00
0.12
1.18
1.14
0.18
0.
35
oxyacetylene torch methods, employing a suitable é‘j:::::::_____ 121%,?
3'3?
3;
81(1)‘:
i:
31g
made in twelve-gage sheet with one-eighth inch
_
_
welding
rods, us1ng
both the electric arc and the
9 ........... _.
?ux to protect the metal during welding.
21)
Table A
20
Composition of welding rod
LT
Method of
No.
welding
Percent
Percent
Percent
Percent
01'
Ni
Mn
0
Percent
Percent
. s1
-
Percent
Ch
0
Percent
s1
Percent
\
1 ______ ..
18.30
8.95
0.54
0.00
0.17v
0.72 {gfg‘lffct??gfij
gfgg
18.03
9. 27
0. 34
0.11
0. 33
1.21
Electric Arc___._
0.80
0.32
0.07
3 ...... _.
18.38
8.07
0.03
0.10
0.00
1.15 {$55,533,153};
{33
312g
8%
Oxyacetylene. __
1. 65
0. 78
0. 20
818g
xyace y
glam“;
4 ______ __
18.68
0.27
0.07
0.12
0.91
1.03 {gmmct
(1)16
089
M6
5 ______ __
18.65
9.10
0.00
0.07
1.37
0.88
ene___
.88
8.3%
l. 24
(1H7
0.11
Q07
0 ______ __
18.16
8.83
0.03
0.10
1.73
xyace y ene___
1.04 {glecm‘mm_____
.
(11g;
2.23
xyace y one--.
18.35
0.08
0.02
0.00
Examination of these test results reveals that
when the silicon content of the rod was only
0.17%, about 50% of the columbium in the origi
nal rod was lost during welding. When the rod
contained about 0.7% or more silicon, less than
10% of the columbium in the rod was lost.
We have also found that silicon in substantial
amounts tends to improve the resistance of cer
tain chromium-nickel-columbium steels to loss
1.00 {Electric ARM"
.
0.93
IO 31
o
2 ______ ._
7..
40
composvlgllgnngggz‘iposued
Steel
1;) LI
. 64
33
0. l3
0.09
.
1,75
0. 12
30
M9
When subjected to the above described treat
ment, steels number 8 and 9 disintegrated after
they had been heated two weeks at 550° C. and
boiled 100 hours. Samples of steel number 10
were sound and not substantially aifected after
they had been held one month at temperatures
of 300° 0., 400° 0., 475° 0., 550° 0., 650° 0., 750°; 0., 45
and 850° 0., and subsequently boiled for 100 hours.
Samples of steel number 3 were sound and not
of corrosion resistance on prolonged holding at
a?ected after they had been held
elevated temperatures. The addition of silicon ' substantially
one month at temperatures of 300° 0., 400° 0., 475°
50 imparts immunity to intergranular corrosion to
0., 550° 0., 650° 0., 750° 0., and 850° 0., and sub-5 50'
many steel compositions which, because of a rela
sequently boiled for 1000 hours.
tively high carbon content or a somewhat low
The present invention is based on the above
ratio of columbium to carbon, would otherwise not described discoveries and is an alloy steel weld
be completely immune. For example, samples of
56 the steels given in Table B were held at several
ing rod, comprising about 12% to 30% chromium,
about 5% to 30% nickel, about 0.01% to 0.3% 55
2
2,087,631
about 0.1 % to 3% columbium. about 0.7%
to 2%" silicon, and the remainder principally iron.
Several per cent. manganese and up to about 4%
tantalum may also be present. The columbium
content should be about eight to ten times the
holding at elevated temperatures in the neighbor
hood oi! 500° C.
We claim:
' .
-
>
_ 1. A welding rod having substantially the com
position: 12% to 30% chromium; 5% to 30% nick
el; 0.01% to 0.3% carbon; 0.1% to 3% columbium,
carbon content. The columbium content preter
the columbium content being at least about eight
ably exceeds the tantalum content.
The welding rod 0! the invention preferably times the carbon content; 0.7% to 2% silicon;
substantially all iron.
contains no more than about 2% silicon when balance
2. A welding rod having substantially the com 10
10 the oxyacetylene process is to be used and no more
position: 12% to 30% chromium; 5% to 30% nick
than about 1% silicon when the electric arc proc
el; 0.01% to0.3% carbon; 0.1% to3% columbium,
ess is used..
The steel welding rod of the invention not ‘only the columbium content being at least about ten
provides ?ller material which may be deposited times the ‘carbon content; 0.7% to 1% silicon; if
balance substantially all iron.
15 by welding without an excessive loss of the valua
ble and essential constituent, columbium,» but also
FREDERICK M. BECKE'I'.
provides material deposited by welding, having
improved resistance to corrosion after prolonged
BUSSEIL FRANKS.
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