Explore our premium inventory of industrial pipe fittings, forged flanges, resilient seated gate valves, and structural elbows manufactured strictly under ISO 9001 quality management systems.
The global energy transition and expansion of regional transmission networks in Eurasia have elevated the demand for standardized, high-integrity piping components. Among these, the GOST 12820-80 plain plate welded flange (Фланцы стальные плоские приварные) serves as a cornerstone engineering standard across Russia, Kazakhstan, Belarus, and broader CIS/EAEU industrial territories.
GOST 12820-80 defines flat slip-on welded steel flanges intended for connection of pipes and equipment across nominal pressures ranging from PN 0.1 MPa to PN 2.5 MPa (1 kgf/cm² to 25 kgf/cm²). Selecting the correct material grade is critical to ensuring structural integrity in extreme operational environments.
Carbon Steel: St3sp & Steel 20
Widely utilized for standard fluid transport, municipal heating networks, and non-aggressive gas lines operating between -40°C and +475°C. Offers exceptional weldability and economic efficiency.
Low-Alloy Arctic Grade: 09G2S
Engineered specifically for low-temperature northern environments (Siberian and Arctic pipelines) operating down to -70°C. Resists brittle fracture under extreme sub-zero thermal stresses.
Austenitic Stainless: 12X18H10T
Titanium-stabilized chromium-nickel steel designed for aggressive chemical processing, acid handling, and high-purity applications. Operating range spans from -196°C cryogenic fluid up to +600°C.
Cross-referencing technical parameters between Eurasian GOST, European EN, and American ASME specifications empowers procurement specialists to make informed substitution and integration decisions.
| Parameter / Standard | GOST 12820-80 (EAEU/Russia) | EN 1092-1 Type 01 (Europe) | ASME B16.5 Slip-On (USA) |
|---|---|---|---|
| Flange Type Description | Flat Plate Welded (Плоский приварной) | Plate Flange for Welding | Slip-On Welding Flange (SO) |
| Nominal Pressure Range | PN 0.1 to 2.5 MPa (1 to 25 bar) | PN 2.5 to PN 100 bar | Class 150 to Class 1500 lbs |
| Nominal Size Range | DN 15 mm to DN 2400 mm | DN 10 mm to DN 2000 mm | NPS 1/2" to NPS 24" |
| Primary Joint Weld Method | Double Fillet Weld (Inner & Outer) | Double Fillet Weld | Double Fillet Weld (Hub Connection) |
| Matching Sealing Faces | GOST 12815-80 (Types 1 to 9) | EN 1092-1 Faces A, B1, C, D | Raised Face (RF), Flat Face (FF) |
| Standard Replacement Code | GOST 33259-2015 (Type 01) | Current Active European Standard | Current Active American Standard |
Our engineered GOST 12820-80 plain plate flanges are heavily integrated into critical infrastructure projects globally, delivering maximum pressure containment and leak protection.
Oil & Gas Refineries
Used extensively in low-pressure storage tank farms, crude transport manifolds, and utility lines. Grade 09G2S flanges ensure integrity during harsh Siberian winters.
Municipal Heating & Utilities
Ideal for district heating networks carrying hot water and low-pressure steam (PN10/PN16). St3sp and Steel 20 deliver reliable life cycles exceeding 30 years.
Chemical Processing Plants
Stainless steel 12X18H10T flanges prevent corrosion contamination in acid lines, organic solvents, and high-purity fertilizer manufacturing equipment.
Navigating international trade and technical compliance requires stringent quality protocols. As a top-tier exporter, our Cangzhou facility enforces comprehensive testing at every production phase.
EAC TR CU 032/2013 Compliance
Fully certified under Technical Regulations of the Customs Union (TR CU 032/2013) governing equipment operating under positive pressure. Ensures seamless customs clearance into EAEU markets.
Non-Destructive Testing (NDT)
100% material traceability with 3.1 Mill Test Certificates (MTC). Flanges undergo Ultrasonic Testing (UT), Magnetic Particle Inspection (MPI), and Hydrostatic Pressure Validation.
Export Pricing Advantage
By leveraging automated forging lines and volume material procurement in Cangzhou, we offer transparent discount structures for EPC contractors and bulk distributors worldwide.
Looking ahead to 2025–2030, our manufacturing facility is integrating advanced industrial technologies to refine flange tolerance precision and carbon efficiency.
CNC Precision Machining
Automated high-speed CNC lathes achieve sealing face surface roughness down to Ra 1.6 - Ra 3.2 µm, ensuring perfect gasket seating and zero fugitive emissions.
Green Hydrogen Readiness
Upgrading steel refining process to minimize micro-porosity, optimizing 12X18H10T stainless flanges for future hydrogen blend transport networks.
GOST 33259-2015 Transition
Full tooling alignment with updated EAEU standards, supplying Type 01 plate flanges fully backwards-compatible with legacy GOST 12820-80 installations.
Comprehensive answers to critical engineering and logistical questions regarding GOST standard flange sourcing.
Browse matching butt-weld tees, seamless steel pipes, butterfly valves, and heavy-wall forged fittings for complete pipeline package procurement.
