Monel Flanges Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 and ISO 14001 certified importer, stockist, and supplier of Monel flanges in Mumbai, India.
We stock Monel 400 and Monel K500 in sizes from 1/2″ NB to 48″ NB and pressure classes 150 through 2500. Stocked types include weld neck, blind, slip-on, socket weld, threaded, lap joint, spectacle blind, orifice, and RTJ under ASTM B564. All shipments carry EN 10204/3.1B mill test certificates.
Monel Flanges Specifications
| Specification | ASTM B564 / ASME SB564 |
|---|---|
| Standards | ANSI/ASME B16.5 (NPS ½–24), B16.47 (NPS 26–60) |
| Grades | Monel 400 (UNS N04400); Monel K500 (UNS N05500) |
| Pressure Classes | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Size Range | 1/2″ NB to 48″ NB (DN15 to DN1200) |
| Face Types | RF, FF, RTJ, Tongue & Groove, Male-Female |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Spectacle Blind, Orifice, RTJ, Reducing |
What are Monel Flanges?
Monel flanges are forged nickel-copper alloy components that join pipes, valves, and pressure vessels in corrosive piping systems. Made from alloys with a minimum 63% nickel and 28–34% copper, they gain strength only through cold working. These flanges resist chloride stress corrosion cracking in seawater and handle de-aerated hydrofluoric acid (HF) at all strengths. Monel is the standard material for HF alkylation unit flanges in petroleum refining. They hold strength up to 1000°F (538°C) and outperform stainless steel in HF service, seawater piping, and caustic handling.
Types of Monel Flanges
Monel Weld Neck Flange (WNRF)
Monel Blind Flange (BLRF)
Monel Slip-On Flange (SORF)
Monel Socket Weld Flange (SWRF)
Monel Threaded Flange
Monel Lap Joint Flange
Monel Spectacle Blind Flange
Monel Orifice Flange
Monel Ring Type Joint Flange (RTJ)
Monel Long Weld Neck Flange
Monel Reducing Flange
Get Monel Flanges at Competitive Prices
Available Grades of Monel Flanges
Monel 400 Flange
This is the most widely used Monel grade. Monel 400 (63.0% Ni, 28.0-34.0% Cu) resists seawater, HF acid, HCl acid, and caustic alkalis. Its tensile strength is about 550 MPa with a yield of about 240 MPa in the annealed condition.
Monel K500 Flange
Monel K500 is the age-hardenable version of Monel 400 with aluminium and titanium additions. It reaches about 690 MPa yield strength through precipitation hardening while keeping the same corrosion resistance.
Industries and Applications of Monel Flanges
- Oil & Gas: HF alkylation unit piping, sour gas joints, and offshore seawater flanges.
- Marine & Shipbuilding: For seawater intake, ballast lines, and fire water systems.
- Chemical & Petrochemical: Caustic soda lines and acid lines carrying HCl and H₂SO₄.
- Pharmaceutical: For clean piping and connections in sterile water systems.
- Power Generation & Water Treatment: Feedwater heater piping, condenser joints, and boiler flanges.
Frequently Asked Questions
What ASTM Standard covers Monel flanges?
What is the difference between Monel 400 and Monel K500 flanges?
Why are Monel flanges preferred for HF alkylation units?
What pressure classes are available for Monel flanges?
Can Monel flanges be used in seawater?
What welding filler metals are used for Monel flanges?
Use ERNiCu-7 filler wire per AWS A5.14 for GTAW and GMAW. Use ENiCu-7 electrodes per AWS A5.11 for SMAW. Preheat to 200–300°C before welding.