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Gost 12820 - Flanges
This standard applies to steel flat welded flanges for fittings, fittings, machines, instruments, apparatus, tanks and pipelines for nominal pressure.

Pressure
Ru St. from 0.1 to 2.5 MPa (from 1 to 25 kgf/cm²)
Temperature
from minus 70˚C to plus 450˚C
Material
steel 20; 12X18H10T; 15X5M