Haihao Group Delivers GOST 33259 WN Flanges and High-Performance Fasteners for Global Client
In today’s industrial landscape, the reliability of pipeline connections is paramount—especially in critical systems operating under high temperature and pressure. Haihao Group, a leading global supplier of pipe fittings, flanges, and gasket solutions, has once again demonstrated its manufacturing excellence by successfully delivering a complete set of flange connection components to an international client.
GOST 33259 WN Flanges are produced in the factory of Haihao
This shipment included:
GOST 33259 Weld Neck Flanges DN400 PN40,
Stud Bolts A193 B16 + 2 Nuts A194 Gr.7,
Spiral Wound Gaskets with 304 + Graphite Configuration.
These products are designed to perform in highly demanding environments such as oil and gas, chemical processing, and power generation sectors.
GOST 33259 Weld Neck Flanges – Built for Russian and CIS Markets
The GOST 33259 WN Flange DN400 PN40 is a critical component designed to meet Russian and CIS market standards. Manufactured using high-temperature alloy P5 material, these flanges are tailored for applications where elevated temperature, thermal cycling, and pressure resistance are essential.
Material Grade: P5 Alloy Steel
Chemical Composition:
- Carbon (C): ≤ 0.15%
- Silicon (Si): ≤ 0.5%
- Manganese (Mn): ≤ 0.5%
- Chromium (Cr): 4.5–6%
- Nickel (Ni): ≤ 0.6%
- Molybdenum (Mo): 0.45–0.6%
- Sulfur (S): ≤ 0.025%
- Phosphorus (P): ≤ 0.03%
This material offers enhanced strength, oxidation resistance, and thermal fatigue resistance—making it suitable for high-temperature service up to 600°C.
Haihao Group’s flanges are 100% inspected for:
Surface integrity (no rust, dents, or scratches),
Dimensional accuracy per GOST standards,
EN 10204 3.1 material certification,
Compatibility with pressure class PN40 and nominal size DN400.
High performance fasteners are packed and ready for shipment
A193 B16 Stud Bolts + A194 Gr.7 Nuts – Secure High-Temperature Fastening
Alongside the flanges, Haihao Group provided a complete set of fasteners, including:
ASTM A193 Grade B16 Stud Bolts
ASTM A194 Grade 7 Heavy Hex Nuts
This bolt-nut combination is designed for high-pressure, high-temperature service. A193 B16 is a chromium-molybdenum-vanadium alloy steel, while A194 Gr.7 nuts provide superior strength and toughness, especially under low-temperature or high-stress conditions.
Each bolt was:
Manufactured with 8UN thread per ASME B1.1,
Delivered with two matching heavy hex nuts,
Accompanied by full material test reports (MTC),
Supplied with heat traceability and batch markings.
Integrated Sealing Solution – 304 + Graphite Spiral Wound Gaskets
To complete the flange joint assembly, Haihao supplied spiral wound gaskets with the following configuration:
Metal winding & rings: ASTM A240 304 Stainless Steel
Filler: Industrial-grade graphite
These gaskets conform to ASME B16.20 and are ideal for fluctuating temperatures, vibration, and aggressive chemical media—guaranteeing long-term sealing performance in harsh operating environments.
Haihao Group – Supplying Global Standards from China to the World
This order is part of Haihao Group’s broader delivery plan to clients in Russia, Singapore, and Brazil, highlighting our ability to support multi-national, multi-standard project requirements. Whether it’s GOST flanges, ASME/ANSI fasteners, or customized sealing solutions, Haihao provides:
- Precision engineering and machining
- Rapid delivery, even on urgent small-batch orders
- Full documentation: 3.1 certificates, compliance reports, MESC codes
- Reliable service, technical support, and export logistics
Contact Haihao Group Today
Looking for a trusted supplier for your GOST 33259 flanges, A193/A194 fasteners, or industrial gaskets? With over 30 years of experience in pipe system solutions and international trade, Haihao Group is ready to support your next project—anywhere in the world.
Get in touch for a technical consultation or a tailored quotation.