Monel 400 (UNS N04400 / 2.4360) Nickel-Copper Alloy Forged Ring

• Monel 400 nickel-copper seamless forged ring, UNS N04400, EN 2.4360, manufactured to ASTM B564 forging standard
• Unique Ni-Cu single-phase matrix delivers unmatched resistance to all concentrations of hydrofluoric acid (HF)
• Ultra-low corrosion rate under high-speed flowing seawater & brine, ideal marine tubular ring components
• Excellent stability in hot concentrated caustic soda and neutral salt water working environments
• Non-magnetic at room temperature, excellent low-temperature toughness without brittle transition
• Continuous uniform grain flow from radial ring rolling, high structural integrity for pressure service
• Custom OD, ID, height & full CNC turning, boring, grooving per customer CAD/PDF drawings
• Cost-effective alloy for HF chemical, offshore desalination and oil & gas saltwater equipment

This series of Monel 400 forged rings are manufactured via open-die forging and radial-axial ring rolling technology. After full solution annealing and stress relief heat treatment, the alloy forms homogeneous single-phase nickel-copper solid solution without harmful precipitates, guaranteeing consistent mechanical and anti-corrosion performance across the whole ring blank.

Monel 400 is the most widely used nickel-copper alloy worldwide. Its core advantage lies in outstanding hydrofluoric acid resistance that stainless steel and common nickel alloys cannot match. It also shows superior erosion resistance in flowing seawater and stable performance in hot alkaline media. Forged ring blanks eliminate heavy solid bar boring workload, widely processed into pressure vessel flanges, seawater pump support rings, HF reactor sealing rings and oilfield brine pipeline connecting components for chemical marine and petrochemical industries.

• Single-phase nickel-copper solid solution alloy with 63% min nickel and 28–34% copper content
• Top-tier corrosion resistance for hydrofluoric acid of any concentration & temperature
• Excellent anti-erosion performance in fast-flowing seawater, no local pitting failure
• Stable service life in concentrated hot caustic alkali and neutral brine media
• Non-magnetic at ambient temperature, retains high toughness down to cryogenic temperature
• Good hot forging, cold machining and weldability without post-weld heat treatment requirement

• Nickel-Copper Series: Monel 400, Monel K-500
• Pure Nickel: Nickel 200, Nickel 201
• Inconel Series: 600, 601, 625, 690, 718, X-750, HX
• Incoloy Series: 800, 800H, 800HT, 825, 925, G-3
• Hastelloy Series: C4, C22, C276, C2000, B2, B3, G35
• Duplex / Austenitic Stainless Steel: 2205, 2507, 304, 316L, 904L
• PH Stainless Steel: 17-4PH, 15-5PH, 17-7PH
• Alloy & Carbon Steel: 4140, 4340, F22, F91, A105, A516 Gr.70

1. Unique HF Acid Corrosion Resistance The only mainstream industrial alloy stable in all HF concentrations, perfectly suited for hydrofluoric acid chemical production equipment.
2. Outstanding Flowing Seawater Erosion Resistance Ultra-low corrosion rate under circulating seawater, far superior to stainless steel for marine pump and desalination ring parts.
3. Stable Performance In Hot Caustic Alkali No corrosion cracking in high-temperature concentrated sodium hydroxide production and storage equipment.
4. Continuous Forged Grain Flow Radial ring rolling creates uninterrupted metal fiber, greatly improves pressure bearing and fatigue performance of ring blanks.
5. Wide Temperature Toughness No ductile-brittle transition at ultra-low temperature, reliable for cryogenic saltwater equipment components.

• Hydrofluoric acid reactor flange forgings, HF pump body support rings
• Seawater desalination plant pressure vessel annular components
• Offshore platform seawater cooling system valve sealing rings
• Oil & gas brine gathering pipeline connecting flanges
• Caustic soda evaporation furnace holding ring blanks
• Fluorine chemical processing equipment internal annular fittings
• Marine ship seawater pump and propeller shaft retainer rings

We provide integrated open-die forging & seamless ring rolling production, full CNC precision machining per customer CAD/PDF drawings:

• Rough cutting, facing, inner & outer diameter turning, ring height milling
• Precision boring, grooving, drilling, threading, chamfering & polishing
• Solution annealing & stress relief heat treatment customization
• Surface pickling, passivation and mirror finishing treatment

We supply Monel 400 forged rings, flanges and annular support blanks for chemical, marine and oil-gas global industrial clients.

• 100% UT Ultrasonic Testing to detect forging lamination & internal crack defects
• Full batch tensile, yield and hardness mechanical performance inspection
• High-precision caliper & CMM for OD/ID/height dimensional tolerance control
• Spectrometer full spectrum chemical composition analysis per heat lot
• Metallographic microscope single-phase microstructure observation

Mill Test Certificate EN 10204 3.1 can be issued and delivered together with shipment documents before delivery.

Packing
- Inner layer: Waterproof anti-rust plastic full wrap + separate protective sleeves
- Outer layer: Reinforced fumigated wooden pallet / wooden case with separation blocks to avoid collision deformation
- Custom heavy-duty export packaging available upon customer request

Lead Time
Normally 10 – 45 working days after receiving advance payment. Exact lead time depends on ring OD/ID size, height, order quantity and custom machining demands.