Babbit BKA
Designation
| Name |
The value |
| Designation GOST Cyrillic |
БКА |
| Designation GOST Latin |
BKA |
| Transliteration |
BKA |
| The chemical elements |
BeCo |
Description
Babbit BKA is used: to fill the friction of axle bearings for railway cars and tenders Railways; in engine and metallurgical engineering (for potting of inserts Buks passenger carriages and freight wagons of broad gauge and bearings of locomotives and tenders, bearings of rolling mills, electric motors low rpm, centrifugal pumps and fans; to fill the tram books).
Note
The coefficient of friction of the babbit without lubrication of 0.44, with the grease of 0.004. Maximum load capacity: static - 200 kgf/cm2, dynamic - 500 kgf/cm2 sec. The maximum temperature of normal bearing operation - +150 °C. recommended fill thickness ≥3.0 mm.
Standards
| Name |
Code |
Standards |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
GOST 1209-90 |
| Castings from non-ferrous metals and alloys |
В84 |
OST 24.916.01-71 |
Chemical composition
| Standard |
Al |
Zn |
Sb |
Pb |
Bi |
Ca |
Mg |
Na |
| GOST 1209-90 |
0.05-0.2 |
0.4-0.6 |
≤0.25 |
The rest |
≤0.1 |
0.95-1.15 |
≤0.2 |
0.7-0.9 |
| OST 24.916.01-71 |
0.05-0.2 |
- |
≤0.25 |
The rest |
≤0.1 |
0.85-1.15 |
≤0.02 |
0.6-0.9 |
Pb is the basis.
According to GOST 1209-90 the total content of other impurities is ≤ 0.30%.
The total content of impurities by OST 24.916.01-71 should be ≤ 0.30%. As agreed by the manufacturer with the consumer, babbit can be supplied with an aluminum content of less than 0.050%.
Mechanical characteristics
| σB, MPa |
d |
Brinell hardness number, MPa |
| In the delivery condition |
| ≥91 |
≥2.5 |
≥32 |
Description mechanical marks
| Name |
Description |
| σB |
Limit short-term strength |
| d |
Elongation after rupture |
Physical characteristics
| Temperature |
r, кг/м3 |
| 20 |
10500 |
A description of the physical symbols
| Name |
Description |
| l |
Coefficient of thermal conductivity |
| С |
Specific heat |
