|
INTRODUCTION
Zirconium is a hard, shiny, grayish
white metal. With its superior corrosion resistance capabilities,
it has increasingly become the material of choice in the fabrication
of chemical processing equipment. For non-nuclear applications,
zirconium has two main alloys: ASTM R60702 (Zr 702), which
is unalloyed, and ASTM R60705, which is alloyed with 2.0-3.0
percent niobium. The physical and mechanical properties of
zirconium are listed in Table 1. Additional alloy information
may be found at our website, www.corrosionsolutions.com, under
the "Tech Resources" menu in the "Product Information" section.
TABLE 1: PHYSICAL AND MECHANICAL PROPERTIES OF
ZIRCONIUM
| Physical
Properties |
Zr
702 |
Zr
705 |
| ATOMIC
NUMBER |
40
|
---
|
| ATOMIC
WEIGHT |
91.22
|
---
|
| ATOMIC
RADIUS |
|
|
|
(Zero charge) |
1.60-1.62
|
---
|
|
(+4 charge) |
0.80-0.90
|
---
|
| DENSITY
|
|
|
|
(g/cc at 20° C) |
6.510
|
6.640
|
|
(lbs/cubic inch) |
0.235
|
0.240
|
| CRYSTAL
STRUCTURE |
|
|
|
Alpha Phase |
Hexagonal
Close-Packed
(below 865° C)
|
---
|
|
Beta Phase |
Body-Centered
Cubic
(above 865° C)
|
Body-Centered
Cubic
(above 854° C)
|
|
Alpha+Beta Phase |
---
|
Hexagonal
Close-Packed
+ Body Centered Cubic
(below 854° C)
|
| MELTING
POINT |
1852°
C (3365° F) |
1840°
C (3344° C) |
| BOILING
POINT |
4377°
C (7910° F) |
4380°
C (7916° C) |
| COEFFICIENT
OF
THERMAL EXPANSION
(per ° C at 25° C/73° F)
|
5.89 x 10-6
|
6.3 x 10-6
|
| SPECIFIC
HEAT
(BTU / lb / °F) |
0.068 |
0.067 |
| VAPOR
PRESSURE(mmHg)
At 2000° C (3632° F)
At 3600° C (6512° F)
|
0.01
900.0 |
---
--- |
| ELECT.
RESISTIVITY
m
ohm-cm at 20° C (68° F) |
39.7 |
55.0 |
| TEMP.
COEFFICIENT OF
RESISTIVITY
per ° C at 20° C (68° F)
|
0.0044 |
--- |
| LATENT
HEAT OF
FUSION (Cal / gm) |
60.4 |
--- |
| LATENT
HEAT OF
VAPORIZATION(Cal / gm) |
1550 |
--- |
| Mechanical
Properties |
|
|
| MODULUS
OF
ELASTICITY (psi) |
14.4
x 106 |
14.0
x 106 |
| SHEAR
MODULUS (psi) |
5.25
x 106 |
5.0
x 106 |
| POISSON’S
RATIO |
0.35
|
0.33
|
One of Ten 1 2
3 4
5 6
7 8
9 10
|
