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This specification2 covers three grades of zirconium and zirconium alloy bar and wire. Unless a single unit is used, for example corrosion mass gain in mg/dm2 , the values stated in either inch-pound or SI units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore each system must be used independently of the other. SI values cannot be mixed with inch-pound values.
| Element | Composition, % | ||
|---|---|---|---|
| Grades R60702 | Grades R60704 | Grades 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, max | 0.16 | 0.18 | 0.18 |
Note :
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.
| Grades | |||
|---|---|---|---|
| R60702 | R60704 | R60705 | |
| Tensile Strength, min, ksi (MPa) | 55 (380) | 60 (415) | 80 (550) |
| Yield Strength, min, ksi (MPa) | 30 (205) | 35 (240) | 55 (380) |
| Elongation in 2 in. or 50 mm min, %B | 16 | 14 | 16 |
Note :
A. For bar only.
B. When a sub-size specimen is used, the gage length shall be as specified in Test Methods E 8 for the specimen.