overview

The Nickel Alloy C276 Washer is crafted with precision Hastelloy C276 and is a high-performance nickel-based alloy fastener fitting with a stable alloy composition, offering excellent overall performance. This pad ring excels in corrosion resistance and high-temperature resistance, adapting to various high and low temperature complex working environments. They are mainly used at flange and bolt connections, serving to evenly distribute and tighten pressure, cushion and dampen vibrations, seal and prevent seepage, and protect the contact surfaces of equipment, effectively extending equipment service life and improving the stability and sealing of connection points. It is widely used in various highly corrosive industrial fields such as chemical and petrochemical, flue gas desulfurization, nuclear power, pharmaceuticals, and environmental protection, making it an indispensable high-quality sealing connector under harsh working conditions.

Features

Excellent chemical stability: Effectively resists corrosion from various strong acids, strong alkalis, chloride solutions, and wet chlorine gas, while also resisting pitting, crevice corrosion, and stress corrosion.
Stable performance at high and low temperatures: Sufficient toughness at low temperatures makes it less prone to brittle cracking; high strength and creep resistance in high-temperature environments, suitable for stable use across a wide temperature range.
Excellent fastening performance: The material is tough and fits the sealing surface well, resisting deformation and loosening under pressure. Long-term use provides stable fastening and long-lasting sealing and leak prevention.
Strong practicality: Low carbon, low impurity composition, resistant to intergranular corrosion after hot processing, non-magnetic and safe, non-toxic, suitable for clean environments across multiple industries.
Long service life: Wear-resistant and wear-resistant under harsh conditions, significantly extending the service life compared to ordinary stainless steel washers, reducing replacement frequency.
Wide processing adaptability: Easy to stamp and form, complete standard specifications, customizable non-standard sizes as needed, suitable for various flange and bolt assembly scenarios.

Chemical composition table

Elements	Concentration range	Function
Ni	56.0-59.0	The main base material stabilizes the metallographic structure, enhancing overall corrosion resistance and toughness
Cr	14.5-16.5	High chromium ratio forms a dense passivation film, providing strong resistance to oxidative corrosion
Mo	15.0-17.0	High molybdenum core ratio, strong resistance to chloride ions, pitting, and crevice corrosion
W	3.0-4.5	Synergistically with molybdenum elements to enhance corrosion resistance, improve high-temperature strength, and creep resistance
Fe	4.0-7.0	Reasonable iron content balances costs without affecting core corrosion resistance

Application

Flue Gas Desulfurization And Environmental Protection

1. Petrochemical industry

With its high-chromium and high-molybdenum formulation, Nickel C276 Washer can withstand long-term corrosion from various chemical corrosive fluids. It is stably used in hydrogenation units, cracking equipment, and acid-base delivery pipelines. It resists deformation and loosening caused by media erosion and temperature fluctuations, effectively eliminating sealing failures, significantly reducing equipment maintenance frequency, ensuring continuous and safe chemical production, and is the preferred sealing accessory for high-pressure chemical corrosion conditions.

2. Flue gas desulfurization and environmental protection industry

Nickel Flat Washer is suitable for connection points in desulfurization towers, spray pipelines, slurry valves, and dust removal equipment. It does not experience pitting or crevice corrosion, securely seals equipment interfaces, prevents acidic media leakage from polluting the environment, and meets the long-term stable operation needs of large-scale environmental desulfurization equipment.

3. Ship and seawater engineering

Alloy C276 Gaskets can be used for ship pipelines, offshore drilling platform accessories, seawater desalination equipment, and coastal anti-corrosion equipment connection locations. It resists rust and deformation in high-salinity and humid environments, with long-lasting and stable sealing performance, perfectly suited for harsh outdoor marine conditions.

4. Pharmaceutical and food industries

Hastelloy C276 Washers are non-toxic and impurity-free, resistant to various organic acid corrosions, made from materials that meet clean production standards, do not release harmful substances to contaminate raw materials, and can be used in pharmaceutical reaction equipment, food purification instruments, and sealed connections in sterile conveying pipelines, balancing corrosion protection and hygiene safety, meeting the dual standards of clean and anti-corrosion use in the fine processing industry.

5. Non-ferrous metal smelting and processing

They are compatible with bolt fastening and sealing in smelting reaction tanks, extraction equipment, electrolysis units, and slurry conveying equipment, making them resistant to damage under high-temperature acidic smelting conditions, stabilizing equipment connection structures, improving operational stability, and reducing equipment failures caused by corrosion.

6. High-temperature and high-pressure equipment

This component is often used in connection and fastening points for nuclear power auxiliary pipelines, high-temperature thermal pipelines, and high-voltage energy storage equipment, relying on stable mechanical properties and corrosion resistance to ensure the safe and reliable operation of high-end energy equipment.

Production process and quality control

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