The 70-30 Alloy Plrd (Plrd-30)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
ПлРд 70-30 |
| Designation GOST Latin |
PlPd 70-30 |
| Transliteration |
PlRd 70-30 |
| The chemical elements |
PtHgд 70-30 |
| Name |
The value |
| Designation GOST Cyrillic |
ПлРд-30 |
| Designation GOST Latin |
PlPd-30 |
| Transliteration |
PlRd-30 |
| The chemical elements |
PtHgд-30 |
Description
Plrd 70−30 alloy is used: for the manufacture of semi-finished products (sheets, tapes, strips, foils, wire, pipes, profiles, forgings) by hot or cold deformation used in instrument and apparatus building; thermocouples; laboratory glassware; hardware; glass vessels; thermoelectrodes of thermoelectrical transducers.
Note
Platinum-rhodium alloy.
Standards
| Name |
Code |
Standards |
| Wire of non-ferrous metals and their alloys |
В74 |
GOST 10821-2007, GOST 18389-2014 |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
GOST 13498-79, GOST 13498-2010 |
| Sheets and stripes |
В53 |
GOST 24353-80, GOST 24718-81 |
| Classification, nomenclature and general norms |
В50 |
GOST 6563-75 |
Chemical composition
| Standard |
Fe |
Rh |
Pt |
| GOST 10821-2007 |
- |
30 |
70 |
| GOST 13498-79 |
≤0.04 |
29.5-30.5 |
69.5-70.5 |
Pt is the basis.
According to GOST 13498-79, GOST 13498-2010, the total content of palladium, iridium, and gold in the alloy should be ≤ 0.15%. The sum of all the standard impurities (palladium, iridium, and gold, as well as silicon, lead, antimony and zinc) should be ≤ 0.19%.
According to GOST 10821-2007 the chemical composition is given for the alloy grade PR-30. The chemical composition indicates the nominal mass fraction of the components. As starting materials, platinum and rhodium are used with a mass fraction of the main component of at least 99.95% in accordance with GOST 31290 and GOST 12342.
Mechanical characteristics
| σB, MPa |
d |
| GOST 13498-2010 |
| 440-590 |
- |
| Wire in the delivery state according to GOST 10821-2007 |
| ≥490 |
- |
| ≥235 |
≥17 |
| ≥88 |
≥20 |
Description mechanical marks
| Name |
Description |
| σB |
Limit short-term strength |
| d |
Elongation after rupture |
Physical characteristics
| Temperature |
r, кг/м3 |
R, НОм · м |
| 20 |
17630 |
190 |
A description of the physical symbols
| Name |
Description |
| l |
Coefficient of thermal conductivity |
| С |
Specific heat |
Technological properties
| Name |
The value |
| Operating temperature |
Composed of a thermoelectric transducer together with alloy PR-6 operating temperature range is from 600 to 1700 °C. maximum temperature for short-term use of 1800 °C. |
