Butt welded collar flanges GOST 12821-80 with a connecting surface according to standard GOST 12815-80. Steel: 20, 09Г2С, 15Х5М,12Х18Н10Т. Dnom 15-1000, Pnom 16-200.
Plane flanges GOST 12820-80 with a connecting surface according to standard GOST 12815-80. Steel: 20, 09Г2С, 15Х5М,12Х18Н10Т. Dnom 15-1200, Pnom 1-25.
Loose flanges on a welded ring GOST 12822-80. Steel: 20, 09Г2С. Dnom 15-1200, Pnom 1-25.
Flanges ASME-B16.5 (ANSI).
Flanges DIN-EN-1092-1.