Monel 400 Flanges

Monel 400 Flanges Supplier in Mumbai, India - ASTM B564 UNS N04400

Nicorex Alloys is a certified ISO 9001 for quality and ISO 14001 trusted supplier of Monel 400 flanges in Mumbai, India. We provide these flanges manufactured in accordance with ASTM B564 / ASME SB564 standards.

Alloy 400 (Werkstoff 2.4360) is a solid-solution nickel‑copper alloy. They contain at least 63% nickel and 28-34% copper: the highest copper content of any nickel alloy. These flanges maintain corrosion rates below 1 mpy even in fast-flowing seawater at velocities above 2.4 m/s, where most copper-based and stainless steel alloys corrode quickly. This combination of resistance to high-velocity seawater and outstanding resistance to de-aerated hydrofluoric acid at all concentrations makes UNS N04400 flanges a preferred joint material for marine piping and HF alkylation units worldwide. In the annealed condition, it provides a minimum tensile strength of 483 MPa (70 ksi) and a minimum yield strength of 172 MPa (25 ksi), giving a reliable safety margin in demanding service. Monel 400 flanges are available in all common configurations, including weld neck (WNRF), slip‑on (SORF), blind (BLRF), socket weld (SWRF), threaded, lap joint, long weld neck (LWN), ring type joint (RTJ), spectacle blind, and reducing designs. Standard sizes cover NPS 1/2″ to 24″ per ASME B16.5 and NPS 26″ to 60″ per ASME B16.47, in pressure classes 150 to 2500.

The alloy meets NACE MR0175 / ISO 15156 standards and is widely used in marine, petroleum refining, chemical processing, desalination, and power generation.

Monel 400 Flanges Specifications

Monel 400 Flanges specifications, sizes, pressure ratings, flange face styles, dimensional standards and types are listed below:

Specification	ASTM B564 / ASME SB564
Flange Types	WNRF, SORF, BLRF, SWRF, Threaded, Lap Joint, LWNRF, RTJ, Spectacle Blind, Reducing
Size (ASME B16.5)	NPS 1/2” to NPS 24”
Size (ASME B16.47)	NPS 26” to NPS 60”
Pressure Classes	150, 300, 400, 600, 900, 1500, 2500
Face Types	RF, FF, RTJ, Tongue & Groove, Male & Female
Dimensional Standards	ASME B16.5, B16.47, B16.36, B16.48, MSS SP-44, EN 1092-1, JIS B2220, BS 4504

Chemical Composition of Monel 400 Flanges

The chemical composition of Monel 400 flanges and their proportion percentages are mentioned in the following table:

Element	Nickel (Ni) + Cobalt (Co)	Copper (Cu)	Iron (Fe)	Manganese (Mn)	Carbon (C)	Silicon (Si)	Sulfur (S)
WT%	63.0 min	28.0 – 34.0	2.5 max	2.0 max	0.3 max	0.5 max	0.024 max

Their key feature is a copper content of 28–34%. It provides resistance to reducing acids (HF, H₂SO₄, HCl in de-aerated conditions) while the 63% Ni base prevents the dealloying and stress-corrosion cracking that affects brass and bronze alloys in identical service.

Mechanical Properties of ASTM B564 Monel 400 Flanges

Mechanical characteristics of ASTM B564 Monel 400 flanges, specified for the alloy in its standard annealed delivery condition:

Property	Tensile Strength (min)	Yield 0.2% Offset (min)	Elongation in 4D (min)
Value	483 MPa (70 ksi)	172 MPa (25 ksi)	35%

Monel 400 is a solid-solution alloy. It cannot be hardened by heat treatment; strength increases only through cold working. Forged flanges ship in annealed or hot-finished condition. Actual tensile values for forgings typically range from 517 to 621 MPa, well above the 483 MPa minimum. Density: 8.80 g/cm³ (0.318 lb/in³). Melting range: 1300-1350°C (2370-2460°F).

Monel 400 Flanges Equivalent Grades

Monel 400 flanges (UNS N04400) are also known by equivalent grades such as Werkstoff Nr. 2.4360, AFNOR NU-30M, and JIS NW 4400, as shown in the table below.

UNS	DIN / Werkstoff	EN	BS	ISO	JIS	AFNOR
N04400	2.4360 / 2.4361	NiCu30Fe	NA 13	NW 4400	NW 4400	NU 30

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Types of Monel 400 Flanges Available

Monel 400 forged flanges are produced in all configurations per ASME B16.5 and B16.47. As a solid-solution nickel-copper alloy, 400 exhibits excellent forgeability:

Monel 400 Weld Neck Flanges (WNRF)

Monel 400 Slip-On Flanges (SORF)

Monel 400 Blind Flanges (BLRF)

Monel 400 Socket Weld Flanges (SWRF)

Monel 400 Threaded Flanges

Monel 400 Lap Joint Flanges

Monel 400 Long Weld Neck Flanges (LWNRF)

Monel 400 Ring Type Joint Flanges (RTJ)

Monel 400 Spectacle Blind Flanges

Monel 400 Reducing Flanges

Monel 400 Orifice Flanges

Pressure-Temperature Ratings for Monel 400 Flanges

Pressure–temperature ratings for Monel 400 flanges show how much pressure the flange can safely handle at different temperatures as per ASME B16.5.

Temperature (°C)	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
-29 to 38	15.9	41.4	55.2	82.7	124.1	206.8	344.7
50	15.4	40.2	53.7	80.5	120.7	201.2	335.3
100	13.8	35.9	47.9	71.9	107.8	179.7	299.5
150	12.9	33.7	45.0	67.5	101.2	168.7	281.1
200	12.5	32.7	43.6	65.4	98.1	163.5	272.4
250	12.1	32.6	43.5	65.2	97.8	163.0	271.7
300	10.2	32.6	43.5	65.2	97.8	163.0	271.7
350	8.4	32.6	43.4	65.1	97.7	162.8	271.3
400	6.5	32.1	42.8	64.2	96.2	160.4	267.4
450	4.6	26.9	35.9	53.8	80.7	134.5	224.2
475	3.7	20.8	27.7	41.5	62.3	103.8	173.0

Major Industries and Applications of Monel 400 Flanges

Monel 400 flanges are used worldwide in ships, refineries, chemical plants, desalination plants, oil and gas facilities, and power plants because they remain reliable in harsh conditions.

Marine Engineering and Shipbuilding: Seawater cooling circuits, fire main piping, ballast systems, and bilge lines.
Petroleum Refining and HF Alkylation: The standard alloy for HF alkylation units. Flanges connect reactors, acid settlers, reboilers, crude distillation overhead condensers and acid transfer piping.
Chemical processing and acid handling: Monel 400 flanges are used in piping that carries de-aerated sulfuric acid (H₂SO₄), hydrochloric acid (HCl), and caustic soda.
Desalination and water treatment: They are installed at MSF and RO brine heater connections, where they reliably withstand hot, high‑chloride brine temperatures up to about 120°C.
Oil and gas production: They are used for sour‑gas piping that must meet NACE MR0175 requirements and for offshore piping in the splash zone.
Power generation and feedwater systems: Applied in feedwater heaters, condenser waterbox nozzles, and deaerator piping up to 300°C service.

How to Order Monel 400 Flanges from Nicorex Alloys

To place an order for Monel 400 flanges, please share the following details:

Flange Type - WNRF, SORF, BLRF, SWRF, Threaded, Lap Joint, LWN, RTJ, Spectacle Blind, Reducing
Size - NPS — e.g., NPS 4", NPS 8", NPS 12"
Pressure Class - 150, 300, 600, 900, 1500, 2500
Face Type - RF, FF, RTJ — specify ring number if RTJ
Schedule / Bore - For weld neck and socket weld flanges
Material Grade Confirmation - ASTM B564 UNS N04400
Quantity - Number of pieces or weight in kg
Testing / Certification Requirements - MTC 3.1, PMI, NACE, TPI
Dimensional Standard - ASME B16.5, EN 1092-1, DIN, JIS, etc.
Packaging Requirements - Standard or sea-worthy export packing
Delivery Destination - Domestic India / International Export

Non-standard sizes and custom machining available. Quotation within 24 hours.

Frequently Asked Questions

What ASTM specification covers Monel 400 Forged Flanges?

ASTM B564 covers nickel alloy forgings, including UNS N04400. Dimensions: ASME B16.5 covers NPS 1/2″–24″; ASME B16.47 covers NPS 26″–60″.

Can Monel 400 Flanges be used in Hydrofluoric Acid Service?

Yes. Monel 400 is the industry-standard alloy for HF service. It resists all concentrations of de-aerated HF to 538°C. WNRF and RTJ in Class 300-900 are standard for HF alkylation piping.

What is the Maximum Service Temperature for Monel 400 flanges?

The maximum service temperature for Monel 400 flanges is 538°C (1000°F) as per ASME B16.5 pressure‑temperature ratings.

Why are Monel 400 Flanges slightly magnetic?

Monel 400 has a Curie temperature within the ambient range (21-49°C), and it can show slight ferromagnetic behaviour. For non-magnetic applications, Monel 400 may exhibit slight magnetism depending on temperature and cold work.

What is the difference between Monel 400 and K500 Flanges?

Monel 400 is solid-solution strengthened (yield 172 MPa min). K500 is precipitation-hardened with Al and Ti to approximately three times the yield strength (690 MPa aged). Both share similar corrosion resistance. K500 has a greater SCC tendency in the aged condition. Choose 400 for general corrosion-resistant joints; K500 for high-strength pump shaft and valve stem connections.