Monel 400 Flanges

Manufacturer of ASTM B564 UNS N04400 Pipe Flanges and Alloy 400 Slip-on / Blind Flanges

Solitaire Overseas is a trusted manufacturer, supplier, and exporter of high-quality Monel 400 Flanges and forgings. Known by the designations ASTM B564 UNS N04400 or Wnr 2.4360, this nickel-copper superalloy is exceptionally strong and resilient, making it a commercially vital component for critical industrial applications worldwide.

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What Are Monel 400 Flanges?

Monel 400 Flanges are manufactured from a high-performance nickel-copper superalloy. This material is primarily composed of nickel (approx. 63%) and copper (approx. 28-34%), a balance that provides superior corrosion resistance, making it an ideal choice for the demanding marine environment. The alloy is particularly effective at resisting chloride stress corrosion cracking, a common failure mechanism in saltwater applications. Monel 400 exhibits high tensile strength and is easily welded and well-formed, ensuring its long-term commercial viability in marine engineering and various industrial sectors.

The utility of the ASTM B564 UNS N04400 Pipe Flange extends to high-temperature systems, with its mechanical properties remaining stable up to 1000°F (538°C). While the initial production of these components may involve annealing, the final strength and impact resistance of the Nickel Alloy 400 Forged Flanges can be significantly improved through the use of tempers. The unique copper content provides unexpected resistance to certain acids: in a de-aerated condition, the alloy resists both hydrochloric and hydrofluoric acids, making the Class 150 Monel 400 RTJ Flange suitable for acid handling applications. However, users must avoid environments containing ammonia or nitric acid solutions, as these rapidly attack the alloy.

Our flanges are easily welded and well-formed, built to meet stringent international standards including ANSI B16.5 and ASME SB564. All our flanges are produced to stringent quality standards, ensuring reliable performance in critical service.

Please contact us to explore our full range of Monel Flanges and receive a customized quote for your project.

Types of Monel 400 Flanges
Monel 400 Flanges Specifications
Monel 400 Pipe Flanges Chemical Composition
Mechanical Properties of Monel 400 Pipe Flanges
Monel 400 Flanges Density
Melting Point of Monel Flanges
Equivalent Material Grade of Monel 400 Flanges
Monel 400 Flanges Pressure Rating
Monel 400 Flanges Dimensions
Applications of Monel 400 Flanges
Related Products
FAQ For Monel 400 Flanges

Types of Monel 400 Flanges

Solitaire Overseas manufactures and supplies a complete inventory of Monel 400 Flanges across numerous types and pressure classes, adhering to standards like ANSI B16.5. We offer sizes ranging from ½ inch to 48 inches and pressure ratings from Class 150 to Class 2500 (PN6 to PN64). Our range includes various functional types to suit every piping need:

Slip On Flanges (ASTM B564 Monel 400 Slip On Flanges): Used for easy adjustment and positioning before welding.
Blind Flange (Monel 400 Blind Flange): Used to terminate pipe ends.
Weld Neck Flange (ASTM B564 UNS N04400 Weld Neck Flange): Provides high structural integrity.
Orifice Flange (Alloy 400 Orifice Flange): A specialized type used for flow measurement.
Socket Weld Flanges (ASME SB564 Alloy 400 Socket Weld Flanges): Welded onto the pipe within a recessed socket.
Threaded Flanges (Monel Alloy 400 Threaded Flanges): Fitted to pipes via corresponding threads.

Monel 400 Flanges Specifications

These specifications define the dimensional standards, material designations, and available product configurations for Monel 400 flanges.

Specification	Details
Standard	ASTM B564 / ASME SB564
Designation	UNS N04400, Wnr 2.4360
Types	Weld Neck, Slip On, Blind, Socket Weld, Threaded, Lap Joint, Orifice, RTJ
Size Range	NPS 1/2" to 48"
Pressure Ratings	Class 150, 300, 600, 900, 1500, 2500 (ASME B16.5)
Metric Ratings	PN6, PN10, PN16, PN25, PN40, PN64, PN100

Monel 400 Pipe Flanges Chemical Composition

The Monel 400 alloy is primarily a nickel-copper composition, which is key to its high corrosion resistance, especially in marine and chemical environments. The table below outlines the specific chemical percentages of the primary alloying elements.

Grade	C (max)	Mn (max)	Si (max)	S (max)	Cu	Fe (max)	Ni (min)
Monel 400	0.30	2.00	0.50	0.024	28.00 – 34.00	2.50	63.00

Mechanical Properties of Monel 400 Pipe Flanges

Monel 400 offers a combination of high strength and good ductility, retaining its mechanical integrity even at elevated temperatures, as shown below.

Element	Density	Melting Point	Tensile Strength	Yield Strength (0.2% Offset)	Elongation
Monel 400	8.8 g/cm³	1350 °C (2460 °F)	550 MPa (80,000 Psi)	240 MPa (35,000 Psi)	40 %

Monel 400 Flanges Density

Property	Value
Density	8.83 g/cm³

Melting point of Monel Flanges

Property	Value
Melting Point Range	1300 – 1390 °C

Equivalent Material Grade of Monel 400 Flanges

Monel 400 is recognized globally under various equivalent international material designations, confirming its broad industry acceptance.

Standard	WERKSTOFF NR.	UNS	JIS	BS	GOST	AFNOR	EN
Monel 400	2.4360	N04400	NW 4400	NA 13	МНЖМц 28-2,5-1,5	NU-30M	NiCu30Fe

Monel 400 Flanges Pressure Rating

The working pressure of Monel 400 Flanges (Alloy 400) varies significantly based on both the ASME pressure class (150 to 2500) and the operating temperature (°C). As temperature increases, the maximum allowable working pressure decreases across all classes.

The table below shows the maximum allowable working pressures in bar across different temperature points.

Temp., °C	150	300	400	600	900	1500	2500
-29 ~ 38	20.0	51.7	68.9	103.4	155.1	258.6	430.9
50	19.5	51.7	68.9	103.4	155.1	258.6	430.9
100	17.7	51.5	68.7	103.0	154.6	257.6	429.4
150	15.8	50.3	66.8	100.3	150.6	250.8	418.2
200	13.8	48.6	64.8	97.2	145.8	243.4	405.4
250	12.1	46.30	61.7	92.7	139.0	231.8	386.2
300	10.2	42.9	57.0	85.7	128.6	214.4	357.1
325	9.3	41.4	55.0	82.6	124.0	206.6	344.3
350	8.4	40.3	53.6	80.4	120.7	201.1	335.3
375	7.4	38.9	51.6	77.6	116.5	194.1	323.2
400	6.5	36.5	48.9	73.3	109.8	183.1	304.9
425	5.5	35.2	46.5	70.0	105.1	175.1	291.6
450	4.6	33.7	45.1	67.7	101.4	169.0	281.8
475	3.7	31.7	42.3	63.4	95.1	158.2	263.9
500	2.8	28.2	37.6	56.5	84.7	140.9	235.0
538	1.4	16.5	22.1	33.1	49.6	82.7	137.9
550	-	13.9	18.6	27.9	41.8	69.7	116.2
575	-	9.4	12.6	18.9	28.3	47.2	78.6
600	-	6.6	8.9	13.3	19.9	33.2	55.3
625	-	5.1	6.8	10.3	15.4	25.7	42.8
650	-	4.7	6.3	9.5	14.2	23.6	39.4

Monel 400 Flanges Dimensions

This table provides the standard conversion between the Imperial (Inch) and Metric (DN/Nominal Diameter) sizes for Monel 400 flanges.

Nominal Diameter Conversion Chart

Inch	DN (mm)	Inch	DN (mm)
1/2	15	12	300
3/4	20	14	350
1	25	15	375
1 1/4	32	16	400
1 1/2	40	18	450
2	50	20	500
2 1/2	65	24	600
3	80	28	700
4	100	30	750
5	125	32	800
8	200	36	900
10	250

Applications of Monel 400 Flanges

Monel 400 Flanges are highly valued for their exceptional strength and corrosion resistance across various aggressive and demanding industries. Their ability to withstand saltwater, steam, and non-oxidizing acids makes them essential in the following applications:

Marine Engineering: Used extensively for propeller shafts, pump and valve components in deep-sea vessels, shipbuilding, and marine fixtures due to their resistance to seawater corrosion and biofouling.

Chemical Processing: Critical for handling chemicals like hydrofluoric acid, sulfuric acid, and hydrochloric acid, particularly in de-aerated conditions. They are used in heat exchangers, pipelines, and distillation equipment.

Petrochemical and Oil & Gas: Employed in crude oil distillation, piping for highly corrosive fluids, and heat exchanger bundles where resistance to brine and high temperatures is necessary.

Power Generation: Used in feed water heaters, boiler components, and heat exchangers in power plants, where they resist hot, corrosive steam and water.

Acid Production/Pickling: Essential components in facilities that produce or use hydrochloric and hydrofluoric acids, especially for pickling operations in the steel industry.

Electrical and Electronic Components: Used for some electrical applications due to the alloy's good conductivity and resistance to corrosion.

FAQ

What makes Monel 400 suitable for marine applications?

Monel 400 offers exceptional resistance to saltwater corrosion, pitting, and marine biofouling. Its non-magnetic nature and ability to withstand high pressures and harsh chloride-rich environments make it ideal for marine and offshore systems.

Are your Monel 400 flanges certified to ASTM B564?

Yes, all our Monel 400 flanges are manufactured in full compliance with ASTM B564 standards. Each flange is delivered with Mill Test Certificates (EN 10204 3.1/3.2) ensuring material traceability, mechanical properties, and chemical composition authenticity.

Is Monel 400 better than stainless steel?

Monel 400 outperforms stainless steel in marine and chemical environments due to its superior resistance to chloride-induced corrosion. While stainless steel is more economical, Monel 400 is preferred for high-stress, high-salinity, and acidic applications.

What is the difference between Monel 400 and Monel 405?

Monel 405 is a free-machining version of Monel 400 with added sulfur for improved machinability. While both share similar corrosion resistance and strength, Monel 405 is better suited for components requiring extensive machining like precision fittings.

What is the maximum temperature for Monel 400?

Monel 400 can operate effectively up to 540°C (1000°F) in oxidizing conditions and slightly higher in reducing environments. Beyond this range, its mechanical properties may decline, making it less suitable for high-temperature structural applications.