This specification2 covers three grades of zirconium and zirconium alloy forgings.The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
Element |
Composition, % | ||
|---|---|---|---|
| UNS Grade Designation | |||
| R60702 | R60704 | R60705 | |
| Zirconium + hafnium, min | 99.2 | 97.5 | 95.5 |
| Hafnium, max | 4.5 | 4.5 | 4.5 |
| Iron + chromium | 0.2 max | 0.2 to 0.4 | 0.2 max |
| Tin | ... | 1.0 to 2.0 | ... |
| Hydrogen, max | 0.005 | 0.005 | 0.005 |
| Nitrogen, max | 0.025 | 0.025 | 0.025 |
| Carbon, max | 0.05 | 0.05 | 0.05 |
| Niobium | ... | ... | 2.0 to 3.0 |
| Oxygen | 0.16 | 0.18 | 0.18 |
A. By agreement between the purchaser and the manufacturer, analysis may be required and limits established for elements and compounds not specified in the table of chemical composition.
| UNS Grade Designation | |||
|---|---|---|---|
| R60702 | R60704 | R60705 | |
| Tensile strength, min, ksi (MPa) | 55 (379) | 60 (413) | 70 (483) |
| Yield strength, min, ksi (MPa) | 30 (207) | 35 (241) | 55 (379) |
| Elongation in 2 in. or 50 mm, min, % A | 16 | 14 | 16 |
A. When a sub-size specimen is used, the gage length shall be as specified in Test Methods E 8 for that specimen.