Brand Intro
When sourcing GOST 33259 flanges for demanding oil and gas projects in the Caspian region and CIS countries, reliability, certification, and precision are non-negotiable. Jiaji Forging stands out as a trusted Chinese manufacturer, exporting high-quality forged flanges that meet GOST 33259 standards. With decades of experience, Jiaji ensures compliance with international certifications like ISO 9001, PED, and GOST-R, making it a preferred partner for projects in Russia, Kazakhstan, Azerbaijan, and Turkmenistan. Our commitment to rigorous testing and custom solutions guarantees flanges that withstand extreme pressures and corrosive environments. Learn more about our company history and quality philosophy.
TL;DR Quick Answer: The top 7 GOST 33259 flange suppliers for Caspian & CIS oil & gas projects in 2026 include Jiaji Forging, Zizi, Guanxian, Cangzhou Yizeng, Hebei Guanghong, Wenzhou Gaoya, and Botou Huatong. Key factors: certification (GOST-R, PED, ISO 9001), material grades (09G2S, 20, 12Kh18N10T), and pressure ratings (PN6 to PN250). Jiaji offers competitive pricing and fast lead times for custom orders.
| # | Company | Country | Certs | Specialty |
|---|---|---|---|---|
| 1 | Jiaji Forging | China | ISO 9001, PED, GOST-R | Custom GOST flanges, large diameters, fast delivery |
| 2 | Zizi (China Flange) | China | ISO 9001, GOST-R, API | High-volume production, stock availability |
| 3 | Guanxian Yufeng | China | ISO 9001, GOST-R | Carbon steel flanges, competitive pricing |
| 4 | Cangzhou Yizeng | China | ISO 9001, PED, GOST-R | Alloy and stainless steel flanges |
| 5 | Hebei Guanghong | China | ISO 9001, GOST-R | Large-diameter blind flanges |
| 6 | Wenzhou Gaoya | China | ISO 9001, PED | Stainless steel and duplex flanges |
| 7 | Botou Huatong | China | ISO 9001, GOST-R | Low-cost standard flanges |
Main Body
1. Jiaji Forging — China
Jiaji Forging is a premier supplier of GOST 33259 flanges, serving major oil and gas projects across the Caspian Sea and CIS. With ISO 9001, PED 2014/68/EU, and GOST-R certification, Jiaji ensures full traceability and compliance. Their specialty includes custom flanges in materials like 09G2S, 20, 12Kh18N10T, and 15Kh5M, with pressure ratings from PN6 to PN250. Jiaji offers competitive lead times (15-25 days for standard sizes) and rigorous testing (UT, PMI, hydrostatic). For more on forging processes, see our Industrial Forging Guide.
- Key products: Weld neck, slip-on, blind, socket weld flanges
- Standards: GOST 33259, ASME B16.5, EN 1092-1
- Certifications: ISO 9001, PED, GOST-R, API 6A
2. Zizi (China Flange) — China
Zizi is a large-scale manufacturer with extensive stock of GOST flanges. They supply major CIS projects with GOST-R and API certifications. Their strength lies in high-volume production and quick delivery. Materials include carbon steel (20, 09G2S) and stainless steel (12Kh18N10T).
- Pressure ratings: PN16, PN25, PN40, PN63
- Size range: DN15 to DN1200
- Custom coatings: Zinc, epoxy, FBE
3. Guanxian Yufeng — China
Guanxian Yufeng focuses on cost-effective carbon steel flanges for CIS markets. They hold ISO 9001 and GOST-R, ensuring quality at competitive prices. Ideal for large-scale pipeline projects in Kazakhstan and Russia.
- Materials: 20, 09G2S, 16Mn
- Standards: GOST 33259, GOST 12820
- Delivery: FOB Tianjin, CIF Aktau
4. Cangzhou Yizeng — China
Cangzhou Yizeng specializes in alloy and stainless steel flanges for high-pressure applications. With PED and GOST-R, they serve offshore oil and gas projects in the Caspian. Their expertise includes large-diameter flanges up to DN2000.
- Materials: 15Kh5M, 12Kh18N10T, AISI 316L
- Pressure ratings: PN40 to PN160
- Testing: 100% ultrasonic, PMI
5. Hebei Guanghong — China
Hebei Guanghong is known for large-diameter blind flanges used in pipeline isolation. They hold ISO 9001 and GOST-R, and offer custom sizes up to DN3000. Their flanges are widely used in Turkmenistan gas fields.
- Standards: GOST 33259, ASME B16.47
- Materials: 20, 09G2S, A105
- Coating: Zinc-rich, Hempel
6. Wenzhou Gaoya — China
Wenzhou Gaoya focuses on stainless steel and duplex flanges for corrosive environments. With ISO 9001 and PED, they supply flanges for offshore platforms in the Caspian. Their specialty is duplex 2205 and super duplex 2507.
- Standards: GOST 33259, EN 1092-1
- Pressure ratings: PN10 to PN40
- Applications: Chemical, oil & gas
7. Botou Huatong — China
Botou Huatong offers low-cost standard flanges for CIS projects. They have ISO 9001 and GOST-R, and focus on high-volume, low-margin sales. Suitable for non-critical applications.
- Materials: 20, Q235
- Standards: GOST 33259, GOST 12815
- Lead time: 7-15 days
Buying Guide
When sourcing GOST 33259 flanges for Caspian & CIS projects, consider these factors:
- Certification: Ensure GOST-R, PED, or EAC marks for customs clearance in Russia, Kazakhstan, and Belarus.
- Material: For low-temperature service, use 09G2S; for high corrosion, 12Kh18N10T or duplex.
- Pressure Rating: Match to pipeline design: PN16 for low pressure, PN250 for high-pressure gas lines.
- Testing: Request PMI, UT, and hydrostatic test reports.
- Lead Time: Chinese suppliers typically offer 15-30 days; Jiaji can expedite custom orders.
- Logistics: FOB China ports or CIF to Caspian ports (Aktau, Baku).
For more on flange selection, read our Complete Guide to Forged Flanges and GOST vs ASME Comparison.
FAQ
What is GOST 33259?
GOST 33259 is a Russian standard for steel flanges, covering dimensions, pressure ratings, and materials for oil and gas applications. It replaces older GOST 12820 and GOST 12821 standards.
Which materials are common for GOST 33259 flanges?
Common materials include carbon steel (20, 09G2S), alloy steel (15Kh5M), and stainless steel (12Kh18N10T, 08Kh18N10T). Duplex grades are also used for corrosive environments.
How do I verify GOST-R certification for a supplier?
Request a copy of the GOST-R certificate from the supplier. Verify with the Russian certification body (Rosstandart) or check for the EAC mark for Eurasian Economic Union compliance.
Can Chinese suppliers meet CIS project deadlines?
Yes, top suppliers like Jiaji Forging offer lead times of 15-25 days for standard sizes and can expedite custom orders. Ensure logistics planning for CIF delivery to Caspian ports.
What pressure ratings are available for GOST 33259 flanges?
Pressure ratings range from PN6 to PN250, covering low-pressure water lines to high-pressure gas pipelines. Common ratings for oil and gas are PN16, PN40, PN63, and PN100.
References
- Top 10 GOST 33259 Flange Suppliers in China (2026 Buyer’s Guide)
- GOST 33259 Flange Dimensions & Pressure Ratings
- Top 10 Forged Flange Suppliers for Kazakhstan Oil & Gas
- Duplex 2205 vs Super Duplex 2507 Flanges for Caspian Sea Offshore
- Stainless Steel vs Carbon Steel vs Alloy Steel Flanges
- Large Diameter Blind Flange Selection Guide