Monel 400 Flanges Manufacturer & Supplier

Q: Are Monel 400 flanges magnetic?

Monel 400 is non-magnetic in the annealed condition. However, slight magnetism may develop after cold working, but it remains minimal compared to other alloys.

Midland Alloys Inc. is a trustworthy manufacturer and supplier of premium Monel 400 flanges which are made from a robust nickel-copper alloy that is well known for its exceptional resistance to steam, seawater and harsh corrosive conditions. High strength, excellent corrosion resistance, good weldability and long-lasting durability make these flanges perfect for use in power generation systems, chemical processing facilities, oil and gas pipelines, and marine applications. We supply a full range of flange types, including slip-on, weld neck, socket weld, blind, and threaded, all built to meet the requirements of ASTM B564 and other recognized industrial standards. Find detailed specifications, dimensions and pressure rating below.

Monel 400 Flanges Overview

A nickel-copper alloy flange called Monel 400 is renowned for its exceptional corrosion resistance and mechanical strength. Usually composed of about 67% nickel and 30% copper it is resistant to deterioration from strong alkalis, sulfuric acid, hydrofluoric acid, and seawater. It operates dependably in both acidic and alkaline environments due to this elemental balance. Even under demanding service conditions the alloy resists pitting, stress corrosion cracking, and crevice corrosion while retaining its strength at high temperatures. Because of these characteristics, Monel 400 can be used in high-temperature and high-pressure applications.

Weld neck, slip-on, socket weld, blind, threaded and lap joint flanges are common varieties of Monel flanges that provide adaptable solutions for various systems. All ASTM B564 flanges adhere to industry standards and some models also satisfy ASME requirements. In applications where exposure to heat, chemicals, or salt is inevitable, such as offshore platforms, chemical plants, oil and gas refineries, and marine systems, Monel 400 flanges are extensively utilized. These products provide strong, long lasting performance under demanding industrial conditions, and have a reliable Monel 400 flange pressure rating.

Benefits of Monel 400 Flanges

When other metals fail in harsh environments Monel 400 flanges provide dependable performance. They are a wise option for long-term industrial use because of their exceptional mechanical strength and resistance to corrosion.

Excellent resistance to seawater, steam, and salt spray
Strong Monel flange corrosion resistance in acidic and alkaline media
Retains mechanical strength in high-temperature and pressure conditions
Non-magnetic and spark-resistant for safe critical applications
Ideal for marine, chemical, and oil & gas operations
Low maintenance with long service life in corrosive systems
Good weldability and workability in pressurised pipe assemblies
Complies with ASTM B564 and other major quality standards

These nickel-copper alloy flange features make Monel 400 a trusted material for demanding applications.

Monel 400 Flanges Specification

Types of Monel 400 Flanges

There are numerous varieties of Monel 400 flanges to accommodate different piping systems and pressure ratings. Depending on the sealing technique, load capacity and installation style each type provides unique advantages.

Manufacturing Types

SORF (Slip-On Raised Face)

Slides over the pipe and gets welded for easy installation in low-pressure systems.
BLRF (Blind Raised Face)

Closes off pipe ends; used for testing or sealing flow in a system.
SWRF (Socket Weld Raised Face)

Pipe fits into a recessed area and is welded around the edge. Ideal for small-bore, high-pressure lines.
WNRF (Weld Neck Raised Face)

Has a long, tapered hub and welds to the pipe for strong, leak-proof joints under high pressure.

Face Forms

Raised Face (RF)

The most common type has a raised surface that improves gasket sealing in medium to high pressure.
Ring Type Joint (RTJ)

Uses a metal ring for sealing and works well in high-pressure, high-temperature services.
Flat Face (FF)

Flat surface flange used with cast iron or low-pressure piping where full face gasket is needed.
Lap-Joint Face (LJF)

Used with stub ends and are easy to align and install. Good for systems that need frequent dismantling.

Contact Midland Alloys Inc. for Your Monel 400 Flanges Needs

Contact us today to discuss how Monel 400 Flange can benefit your application. Whether you need guidance in selecting the right pipes or have specific requirements, our team of experts is here to help you find the optimal solution.

Technical Details & Delivery Condition

Monel Alloy 400 Flanges Equivalent Grade

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

Chemical Composition of ASTM B564 Monel Flange

Understanding the chemical composition of a Monel 400 flange is key to knowing how it performs in extreme environments. The balance of nickel and copper gives the alloy its strength, corrosion resistance and durability.

Grade	C	Mn	Si	Cu	S	Ti	Ni	Al	Fe
Monel 400	0.3 max	2.0 max	0.5 max	28.0 – 34.0	0.02 max	–	63.0 min	0.50 max	1.0 – 2.5

Monel 400 Flanges Mechanical Properties

Element	Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
Monel 400	8.8 g/cm3	1350 °C (2460 °F)	Psi – 80000 , MPa – 550	Psi – 35000 , MPa – 240	40 %

Monel 400 Flange Pressure Rating

A Monel 400 flange’s pressure rating can help guarantee safe operation in high-stress situations. These flanges provide reliable performance in demanding systems and are commonly available in the Monel 150, 300, 600, 900, 1500 and 2500 classes.

Nominal Diameter of ASTM B564 UNS N04400 Flange	Pressure Rating (PN) of Monel 400 Pipe Flange
**Nominal BSP Pipe Size	PN6	PN10	PN16	PN25	PN40
DN 10	75	90	90	90	90
3/8″	50	60	60	60	60	Bolt circle (PCD)
	4 x 11	4 x 14	4 x 14	4 x 14	4 x 14	*
DN 15	80	95	95	95	95
1/2″	55	65	65	65	65	Bolt circle (PCD)
	4 x 11	4 x 14	4 x 14	4 x 14	4 x 14	*
DN 20	90	105	105	105	105
3/4″	65	75	75	75	75	Bolt circle (PCD)
	4 x 11	4 x 14	4 x 14	4 x 14	4 x 14	*
DN 25	100	115	115	115	115
1″	75	85	85	85	85	Bolt circle (PCD)
	4 x 11	4 x 14	4 x 14	4 x 14	4 x 14	*
DN 32	120	140	140	140	140
1 1/4″	90	100	100	100	100	Bolt circle (PCD)
	4 x 14	4 x 18	4 x 18	4 x 18	4 x 18	*
DN 40	130	150	150	150	150
1 1/2″	100	110	110	110	110	Bolt circle (PCD)
	4 x 14	4 x 18	4 x 18	4 x 18	4 x 18	*
DN 50	140	165	165	165	165
2″	110	125	125	125	125	Bolt circle (PCD)
	4 x 14	4 x 18	4 x 18	4 x 18	4 x 18	*
DN 65	160	185	185	185	185
2 1/2″	130	145	145	145	145	Bolt circle (PCD)
	4 x 14	4 x 18	4 x 18	8 x 18	8 x 18	*
DN 80	190	200	200	200	200
3″	150	160	160	160	160	Bolt circle (PCD)
	4 x 18	8 x 18	8 x 18	8 x 18	8 x 18	*
DN 100	210	220	220	235	235
4″	170	180	180	190	190	Bolt circle (PCD)
	4 x 18	8 x 18	8 x 18	8 x 22	8 x 22	*
DN 125	240	250	250	270	270
5″	200	210	210	220	220	Bolt circle (PCD)
	8 x 18	8 x 18	8 x 18	8 x 26	8 x 26	*
DN 150	265	285	285	300	300
6″	225	240	240	250	250	Bolt circle (PCD)
	8 x 18	8 x 22	8 x 22	8 x 26	8 x 26	*
DN 175		315	315	330	350
7″		270	270	280	295	Bolt circle (PCD)
		8 x 22	8 x 22	12 x 26	12 x 30	*
DN 200	320	340	340	360	375
8″	280	295	295	310	320	Bolt circle (PCD)
	8 x 18	8 x 22	12 x 22	12 x 26	12 x 30	*
DN 250	375	395	405	425	450
10″	335	350	355	370	385	Bolt circle (PCD)
	12 x 18	12 x 22	12 x 26	12 x 30	12 x 33	*
DN 300	440	445	460	485	515
12″	395	400	410	430	450	Bolt circle (PCD)
	12 x 22	12 x 22	12 x 26	16 x 30	16 x 33	*
DN 350	490	505	520	555	580
14″	445	460	470	490	510	Bolt circle (PCD)
	12 x 22	16 x 22	16 x 26	16 x 33	16 x 36	*
DN 400	540	565	580	620	660
16″	495	515	525	550	585	Bolt circle (PCD)
	16 x 22	16 x 26	16 x 30	16 x 36	16 x 39	*
DN 500	645	670	715	730	755
20″	600	620	650	660	670	Bolt circle (PCD)
	20 x 22	20 x 26	20 x 33	20 x 36	20 x 42	*
DN 600	755	780	840	845
24″	705	725	770	770		Bolt circle (PCD)
	20 x 24	20 x 27	20 x 33	20 x 36		*
NOTE:*# of holes x diam. of holes “PCD” – Pitch Circle Diameter

ASTM B564 UNS N04400 Flange Dimensions and Sizes

Proper fit, pressure handling and system integrity are ensured by knowing the sizes and dimensions of ASTM B564 UNS N04400 flanges. With dimensions ranging from ½” NB to 48″ NB, these Monel 400 flanges adhere to ASME B16.5 and B16.47 standards for precise installation.

Monel 400 Flanges Dimensions ‘DN’ (Nominal Diameter) in mm
INCH	DN	INCH	DN
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

Monel Flanges Grades We Offer

Monel Flanges

Monel 400 Flanges

Monel K500 Flanges

Manufacturing Process of Monel 400 Flanges

Plate

Shear

Press

Inspection

Lathe

Drilling

Cleaning

Flange

Inspection

Analytic

Marking

Packing & Shipping

Industrial Applications

Because of their superior corrosion resistance and thermal conductivity, Monel 400 flanges are frequently found in condensers and heat exchangers. They function dependably in chemical and marine processing equipment when exposed to steam, saltwater and harsh chemicals. In oil and gas piping systems these flanges are also trusted particularly in offshore drilling and refining facilities where corrosion resistance and mechanical strength are essential. Monel 400 guarantees system integrity and decreases maintenance in pumps, valves and piping used in corrosive environment. Because of its resistance to hydrofluoric acid the alloy is a safe option for HF acid handling systems safeguarding both personnel and equipment. Additionally, when corrosion control is crucial for food-grade processing components, Monel 400 is chosen to ensure hygienic operations free from contamination risks.

Offshore Industry

Nuclear Industries

Refineries

Ship Building

Aerospace

Pharmaceutical

Monel 400 Flanges Certifications & Compliance

ASTM B564, ASME SB564, and pertinent EN/DIN standards are strictly followed in the production of all Monel 400 flanges. For complete transparency, each flange is backed by Mill Test Certificates (EN 10204 3.1 & 3.2) and is manufactured in a facility certified by ISO 9001:2015. Upon request we provide third-party inspections via TUV, BV, SGS, Lloyd’s and DNV. Our flanges meet certifications such as NACE MR0175, PED 2014/68/EU, and AD 2000 W0 when necessary. Every flange is carefully inspected before being shipped to ensure safe and dependable operation, and our quality system guarantees full traceability, testing, documentation, and visual inspection.

Testing & Packaging

To guarantee quality, each Monel 400 flange is put through rigorous testing using PMI, ultrasonic, hydrostatic, and visual inspection techniques. For safe and precise delivery we carefully pack every item in wooden boxes with plastic wrap and include clear export labels.

Why Choose Us

The production of every Monel 400 flange strictly complies with ASTM B564, ASME SB564 and applicable EN/DIN standards. Each flange is supported by Mill Test Certificates (EN 10204 3.1 & 3.2) for complete transparency and they are manufactured in a facility that has ISO 9001:2015 certification. On request, we provide third-party inspections via Lloyd’s, DNV, SGS, BV and TUV. When necessary our flanges meet certifications such as AD 2000 W0, PED 2014/68/EU, and NACE MR0175. Every flange is evaluated in-depth prior to shipment to ensure safe and dependable operation, and our quality system guarantees full traceability, testing, documentation, and visual inspection.

Certification

We are an exporter of Monel 400 flanges with ISO 9001:2015, PED, and NABL certifications. A Mill Test Certificate confirms to traceability and adherence to global standard is included with every product. Our certification demonstrate a strong dedication to safety, quality and the dependability of our global supply chain.

FAQs

Are Monel 400 flanges weldable and machinable?

Yes, Monel 400 flanges are both weldable and machinable using standard techniques. They require low-speed machining and appropriate tools due to their work-hardening nature. For welding, gas-tungsten arc and gas-metal arc methods are preferred.

Are Monel 400 flanges suitable for cryogenic applications?

Yes, Monel 400 maintains good mechanical strength and toughness at sub-zero temperatures, making it suitable for cryogenic services, including in LNG and low-temperature gas processing systems.

Are Monel 400 flanges magnetic?

Monel 400 is non-magnetic in the annealed condition. However, slight magnetism may develop after cold working, but it remains minimal compared to other alloys.

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