TABLE 6—Fatigue Results at 316° C 
Endurance limit Notch 
(108 pst) sensitivity 
Fatigue index at 
Treatment Unnotched Notched ratio* 108 cyclest 
Beta-quenched and 
alpha-annealed 27.5 11.0 0.80 0.60 
Base-annealed 28.0 9.0 0.87 0.85 
* Fatigue ratio = (unnotched fatigue strength) /(tensile strength). 
t Notch sensitivity index gq = (Ky — 1)/(K; — 1), where Ky = 
(unnotched fatigue strength)/(notched fatigue strength) and 
K, = (theoretical maximum stress at notch) /(nominal stress). 
TABLE 9—Hardness Specifications 
Test Hardness 
Rockwell B 98 
Rockwell 15T 92 
Rockwell 30T 80 
Rockwell 15N 68 
Brinell (500 kg load) 158 
Brinell. (3,000 kg load) 200 
TABLE 10—Compressive Strength 
(10? psi)(16)* 
Compressive strength 
Condtiton 
Room temperature 
As-rolled 184.0 
Base-annealed 183.0 
Beta-quenched 174.4 
260° C 
As-rolled 115.2 
Base-annealed 110.7 
* Values are averages of vacuum- and 
inert-atmosphere—arc-melted Zircaloy-2 at 
25 % strain. 
TABLE 11—Tensile Specifications for Rolled Sheet, 600° F* 
Yield 
strength, 
Tensile 0.2% Elongation 
Direction strength offset in 2 in. 
of test (10* pst) (103 pst) (%) 
Longitudinal 31 15 24 
Transverse 29 18.4 35 
* Annealed for 15 min at 843° C, air-cooled. All values are mini- 
mum acceptable. 
TABLE 7—Torsional Properties (13) 
Torsional elastic Torsional Torsional 
modulus proportional 0.2% yield 
Conditions* (108 pst) limit (pst) stress (pst) 
BA 5.24 17,850 29,800 
BA 5.29 19,450 32,100 
HR Do22 13,550 29,500 
HR 5.22 13,700 28,300 
* BA = base-annealed; HR = hot-rolled. 
TORSION. In Table 7, duplicate specimens were evaluated in each 
case. Bear in mind that base-annealing removes hydrogen from 
the material (nominally from 50 ppm as hot-rolled to 10 ppm as 
base-annealed). 
TABLE 12—Elastic Properties in Tension (11) 
Test Elastic 
temperature modulus Poisson's 
Condition (SG) (10% pst) ratio 
Annealed 27 13 .9-14.3 0.368-0.380 
150 13.3-13.8 0.425-0. 460 
Cold-worked 27 14.5 0.382-0. 406 
150 13 .9-14.2 0.392-0. 432 
TABLE 13—Physical Properties of Zircaloy-2 
Density (17) 
At 20° C, 6,570 gm/cm? + 0.0006 (hot-rolled, vacuum-annealed 
sampled from eight vacuum-melted ingots) 
Electrical resistivity (1) 
At 21° C, 74 X 10-* ohm-cm (29 X 10-* ohm-in.) 
Thermal conductivity (3) 
cal/sec/cm*/ watts /cm*/ BTU /hr/ft?/ 
°c °C/em °C/cm °F /ft 
20 0.0279 0.117 6.8 
100 0.0287 0.120 6.9 
200 0.0294 0.123 7.1 
300 0.0306 0.128 7.4 
400 0.0310 0.130 7.5 
500 0.0322 0.135 7.8 
Coefficient of thermal expansion (1) 
Alpha = 6.5 X 10-* in./in./°C, room temperature to 700° C 
Alpha-beta phase transformation temperature limits 
(vacuum-melted material) (18) 
On heating: 815°-830° C (a/a + 8); 975°-995° C (B/a + B) 
On cooling: 770°-785° C (a/a + 8); 930°-960° C (8/a« + B) 
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