GOST 12821 Forged Steel Flanges
GOST 12821 forged steel flanges are manufactured for pipeline systems built to the Russian and CIS standard GOST 12821-80, which defines the dimensions, tolerances and pressure classes of weld neck flanges used across the post-Soviet industrial market.
Every GOST 12821 forged steel flange we produce follows the original standard tables for outside diameter, bolt circle, hub dimensions and facing, ensuring direct compatibility with equipment and pipelines already working to the Russian system.
Our GOST 12821 forged steel flanges are delivered with complete documentation packages, including certificates of conformity, material certificates and test reports that match the format accepted by Russian certification bodies. We regularly export these flanges to projects in Russia, Kazakhstan, Uzbekistan and Belarus.
| Standard | GOST 12821-80, GOST 33259-2015 |
|---|---|
| Type | Weld Neck (pripornoy svarnoy) flange |
| Pressure Rating | PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN200 |
| Size Range | DN15 to DN600 |
| Materials | Steel 20, 09G2S, 15Kh5M, 12Kh18N10T, ASTM A105 equivalent |
| Seal Face | Raised Face (RF), Flat Face (FF) |
| Temperature Range | -70°C to +450°C by steel grade |
| Testing | Hydrostatic test, mechanical tests per GOST |
- Dimensions and tolerances fully follow GOST 12821-80 tables for direct field compatibility
- Weld neck design gives smooth bore transition and full penetration welding for high integrity joints
- Pressure coverage from PN10 to PN200 supports both utility networks and high pressure process lines
- Carbon and low alloy grades selected for cold climate service down to -70°C
- Complete export documentation in the format accepted by CIS certification bodies
- Heat treatment and mechanical testing performed batch by batch with full traceability
Each GOST 12821 forged steel flange is manufactured under a documented quality system and inspected against the GOST 12821 tables before release. Material certificates, heat treatment charts and hydrostatic test reports are compiled for every batch.
The documentation pack is prepared in the format used for CIS deliveries. We have exported GOST 12821 forged steel flanges to Russian and Central Asian pipeline projects for many years, and we understand the inspection routines of the local certification bodies, which keeps approval simple for our customers.
GOST 12821 covers weld neck flanges with a tapered hub, while GOST 12820 covers flat welded plate flanges. Our GOST 12821 forged steel flanges are the weld neck type, recommended for higher pressure and more severe service.
Yes. For deliveries to Russia and the EAEU we can arrange the certificate of conformity and passport documentation required for imported pipeline materials. Please confirm the certification scope with your project specification.
For low temperature service we recommend 09G2S steel, which maintains impact toughness down to about -70°C. Impact tests are performed on every heat used for cold climate orders.
PN10, PN16 and PN25 in DN15-DN300 are the most frequently ordered GOST 12821 forged steel flanges and are produced on short lead times. Higher PN classes are made to order with full documentation.
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