ORNL-2106 - the Molten Salt Energy Technologies Web Site

2. Canning of the billets with '/,-in.-thick type
316 stainless steel appears to be advantageous
from the standpoint of reducing the extrusion
pressure. Because of the number of variables
involved, however, this point needs to be con-
firmed.
3. The larger mass of the commercially produced
billets made possible the use of lower soaking
temperatures at the smaller extrusion ratios (i.e.,
5.5:l) than were found to be optimum for the
extrusion of small laboratory billets.
4. For successful extrusion of these alloys it
is necessary that the billets be upset with suf-
ficient pressure to start the material through the
die and then extruded ut a relatively slow rate to
prevent h ot-sh ort cracking.
These were the first successful attempts to
extrude these materials on a large scale, and it
now appears to be feasible to produce seamless
tubing of these alloys, Three Hastelloy B tube
blanks and one Hastelloy W tube blank are
scheduled to be reduced to 1-in. pipe and small-
diameter tubing for use at ORNL.
Extrusion of Special Alloys
The study of single-phase alloys in the nickel-
molybdenum alloy system that contain 15 to 20%
molybdenum was continued. It is hoped in this
study to find a solution to the problem of em-
brittlement of the Hasteltoy-type alloys as a result
of aging. At present the only readily apparent
solution is to change the composition of the
a 1 I oy s.
It was reported previously that the corrosion
resistance to fused sdlts of the binary alloys of
'T. K. Roche ond H. Inouye, ANP Quar. Prog. Rep.
March 10, 1956, ORNL-2061, p 155.
PERIOD ENDING JUNE 10, 1956
TABLE 3.3.3. COMPOSITIONS OF SPECIAL ALLOYS
PREPARED BY INTERNATIONAL NICKEL COMPANY
Alloy No.
Composition (wt %)
Mo Cr W Nb AI Ti C Ni
T-23011 15 5 3 3 0.5 73.5
To23012 17 0.5 82.5
T-23013 15 3 3 0.5 78.5
T-23014 15 1 1.5 82.5
T-23015 15 3 3 0.5 0.25 78.25
Four extrusion billets, 3 in. in diameter and
3 in. long, were machined from each ingot, three
for tube blanks and one for rod fabrication. The
rod extrusions were for rolling to 0.065-in. strip
for the preparation of test specimens for strength
evaluation. The initial tube blank extrusion ex-
periments involving one billet of each composition
met with little success. When a fast extrusion
rate was used, the alloys demonstrated the hot-
short tendencies of Hastelloy B, with the ex-
ception of alloy T-23013, 15% Moa% Nb-3%
W-0.5% Al-78.5% Ni. The results of this initial
experiment are presented in Table 3.3.4.
Before the remaining billets of these alloys were
extruded, the results obtained in the fabrication
of Hastelloy W at a slow extrusion rate were
sufficiently favorable io prompt an alteration in
TABLE 3.3.4. RESULTS OF PRELIMINARY
ATTEMPTS TO EXTRUDE THE SPECIAL
ALLOYS PREPARED BY THE INTER-
NATIONAL NICKEL COMPANY
Extrusion mtio: 5.4:l
Mandrel size: 3/4 in. dia
Alloy
No.
Extrusion
Temperature Results
(OF)
T-23011 2060
2100 Good tube blank obtained
Press stalled
T-23015 2080 Tube blank crocked on the
inside
163