Incoloy 800/800H/800HT Flanges Manufacturer & Supplier

Midland Alloys Inc. is a trusted manufacturer and supplier of Incoloy 800, 800H, and 800HT flanges, catering to domestic and global industries. An iron-nickel-chromium alloy with outstanding oxidation resistance and creep-rupture strength, the Incoloy 800 series is made for high temperature structural applications. We provide a variety of types of flanges that are made in accordance with ASTM B564 standards, such as weld neck, slip-on, socket weld, blind, threaded, and lap joint flanges. These flanges, which provide metallurgical stability, durability and resistance to sulfidation and carburization under harsh conditions are extensively utilized in heat-treating systems, power plants, and petrochemical facilities.

Incoloy 800/800H/800HT Flanges Overview

Iron nickel chromium alloys known as Incoloy 800, 800H, and 800HT flanges are made for structural applications requiring high temperatures. With strength retention up to 1100°C, these flanges provide exceptional resistance to oxidation, carburization and stress rupture. Incoloy 800 provides general strength, but 800H and 800HT have better creep resistance due to controlled levels of titanium, aluminum, and carbon. Available types include weld neck, slip-on, socket weld, blind, threaded, and lap joint. Manufactured to ASTM B564 and NACE MR0175, they serve power plants, refineries, and heat exchangers reliably.

Benefits of Incoloy 800/800H/800HT Flanges

Flanges made of Incoloy 800, 800H and 800HT provide outstanding dependability in high-temperature, high-stress service settings. A wise option for demanding thermal systems, these heat-resistant alloy flanges are known for their long-term metallurgical stability.

Key Benefits:

Outstanding resistance to oxidation, carburization, and thermal scaling above 800°C
Superior creep and rupture strength under prolonged high-temperature stress
Retains structural integrity in heat exchangers and petrochemical units
Non-magnetic and dimensionally stable through thermal cycling
Good weldability and formability across fabrication methods
Designed for harsh conditions in furnace parts and power plants
Produced to ASTM B564, ASME SB564, and NACE MR0175 standards
Trusted solution for critical systems requiring Incoloy 800 flange benefits

Specification of Incoloy 800/800H/800HT Flanges

Global standards are followed in the manufacturing of Incoloy 800, 800H and 800HT flanges to guarantee their mechanical strength, resistance to corrosion and thermal dependability. The main requirement pertaining to material grade, dimensions and compliance are listed in the table below.

Incoloy 800/800H/800HT Flanges Types

Incoloy 800, 800H, and 800HT flanges are available in multiple connection types, designed to suit various high-temperature and pressure-class piping systems. Depending on the application and service condition each type offers a unique sealing technique.

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 Incoloy 800/800H/800HT Flanges Needs

Contact us today to discuss how Incoloy 800/800H/800HT Flanges 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

Incoloy 800/800H/800HT Flanges Chemical Composition

For Incoloy 800 series flanges to remain strong and resistant to corrosion after extended exposure to high temperatures their chemical composition is important. The values on the list fall within ranges specified by ASTM.

Grade	Ni	Fe	Cr	Cu	Ti	Al	C	Mn	S	Si
Incoloy 800	30.0–35.0	39.5 min	19.0–23.0	0.75 max	0.15–0.60	0.15–0.60	0.1 max	1.5 max	0.015 max	1.0 max
Incoloy 800H	30.0–35.0	39.5 min	19.0–23.0	0.75 max	0.15–0.60	0.15–0.60	0.05–0.10	1.5 max	0.015 max	1.0 max
Incoloy 800HT	30.0–35.0	39.5 min	19.0–23.0	0.75 max	0.25–0.60	0.85–1.20	0.06–0.10	1.5 max	0.015 max	1.0 max

Incoloy 800/800H/800HT Flanges Mechanical Properties

For Incoloy 800 flange components to function well in high-temperature settings, mechanical strength is essential. The important values for tensile, yield and elongation strength are listed in the table below.

Density	Melting Point	Tensile Strength	Yield Strength (0.2% Offset)	Elongation
7.94 g/cm³	1350–1400 ℃	Psi – 75,000 , MPa – 520	Psi – 30,000 , MPa – 205	30–35 %

Incoloy 800/800H/800HT Flanges Equivalent Grades

These nickel alloy flanges are available under various international designation. The chart below shows equivalent standards across major specifications.

STANDARD	UNS	WNR.	AFNOR	EN	JIS	BS	GOST	OR
Incoloy 800	N08800	1.4876	Z8NC32-21	X10NiCrAlTi32-20	NCF 800	NA 15	ЭИ670	XH32T
Incoloy 800H	N08810	1.4958 / 1.4876	Z8NC32-21	X10NiCrAlTi32-20	NCF 800H	NA 15(H)	ЭИ670	XH32T
Incoloy 800HT	N08811	1.4859 / 1.4876	–	X8NiCrAlTi32-21	NCF 800HT	NA 15(HT)	ЭИ670	XH32T

Incoloy ALLOY 800 / 800H / 800HT Blind Flanges Dimensions

Blind flanges in Incoloy 800 series are precision-machined for isolation in high-temperature systems. Below are standard dimensions based on ASME B16.5.

Size in Inch	Size in mm	Outer Diameter (A)	Flange Thickness (B)	Hub OD (C)	Weld Neck OD (D)	Welding Neck Length (E)	Bore (F)	RF Diameter (G)	RF Height (H)	PCD (I)	Weld Face (J)
1/2	15	90	9.6	30	21.3	46	Refer Note	34.9	2	60.3	1.6
3/4	20	100	11.2	38	26.7	51		42.9	2	69.9	1.6
1	25	110	12.7	49	33.4	54		50.8	2	79.4	1.6
1 1/4	32	115	14.3	59	42.2	56		63.5	2	88.9	1.6
1 1/2	40	125	15.9	65	48.3	60		73	2	98.4	1.6
2	50	150	17.5	78	60.3	62		92.1	2	120.7	1.6
2 1/2	65	180	20.7	90	73	68		104.8	2	139.7	1.6
3	80	190	22.3	108	88.9	68		127	2	152.4	1.6
3 1/2	90	215	22.3	122	101.6	70		139.7	2	177.8	1.6
4	100	230	22.3	135	114.3	75		157.2	2	190.5	1.6
5	125	255	22.3	164	141.3	87		185.7	2	215.9	1.6
6	150	280	23.9	192	168.3	87		215.9	2	241.3	1.6
8	200	345	27	246	219.1	100		269.9	2	298.5	1.6
10	250	405	28.6	305	273	100		323.8	2	362	1.6
12	300	485	30.2	365	323.8	113		381	2	431.8	1.6
14	350	535	33.4	400	355.6	125		412.8	2	476.3	1.6
16	400	595	35	457	406.4	125		469.9	2	539.8	1.6
18	450	635	38.1	505	457.2	138		533.4	2	577.9	1.6
20	500	700	41.3	559	508	143		584.2	2	635	1.6
24	600	815	46.1	663	610	151		692.2	2	749.3	1.6

Incoloy ALLOY 800 / 800H / 800HT Stainless Steel Flanges Sizes

We provide stainless steel flanges made of Incoloy alloy 800, 800H and 800HT in a variety of sizes that are appropriate for a range of process settings.

Normal Sizes (in)	Dimension	Flanges Dimensional Sizes 1/2 in to 2 1/2 in
		Class 125 / 150		Class 300		Class 400		Class 600		Class 900		Class 1500		Class 2500
		in	mm	in	mm	in	mm	in	mm	in	mm	in	mm	in		mm
1/2	A	3 1/2	88.9	3 3/4	95.2	3 3/4	95.2	3 3/4	95.2	4 3/4	121	4 3/4	121	5 1/4	133.4
	b	7/16	11.1	9/16	14.3	9/16	14.3	9/16	14.3	7/8	22.2	7/8	22.2	1 3/16	30.2
	D2	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9
	D1	2 3/8	60.3	2 5/8	66.7	2 5/8	66.7	2 5/8	66.7	3 1/4	82.6	3 1/4	82.6	3 1/2	88.9
	n	4	4	4	4	4	4	4	4	4	4	4	4	4	4
	d	5/8	15.9	5/8	15.9	5/8	15.9	5/8	15.9	7/8	22.2	7/8	22.2	7/8	22.2

Incoloy Alloy 800 / 800H / 800HT Price Per Kg (As per demand and manufacturer)

The price of Incoloy 800, 800H, and 800HT flanges per kg varies based on factors such as product size, raw material availability, global nickel prices and the manufacturing origin. The prices listed below are estimates that could alter based on changes in the market.

Flanges	Price List
Incoloy 800 SORF Flanges	US $0.5 – 1000 / Piece
ASTM B564 Alloy 800HT WNRF Flanges	US $300 – 500 / Ton
800HT Alloy Blind Flanges	US $1 – 900 / Piece
UNS N08800 Ring Type Joint Flanges	US $0.5 – 1000 / Piece
Alloy 800HT Long Weld Neck Flanges	US $1 – 300 / Piece

Incoloy Flanges Grades We Offer

Incoloy Flanges

Incoloy 800/800H/800HT Flanges

Incoloy 825 Flanges

Manufacturing Process of Inconel 800/800H/800HT Flanges

Plate

Shear

Press

Inspection

Lathe

Drilling

Cleaning

Flange

Inspection

Analytic

Marking

Packing & Shipping

Industrial Applications for Incoloy 800/800H/800HT Flanges

Incoloy 800/800H/800HT flanges serve demanding systems across a wide range of sectors requiring thermal stability and corrosion resistance. Engineers prefer them in chemical tanks, biofuels plants, and power generation units where high-temperature strength is critical. These flanges support pressure piping in oil & gas industries, desalination systems, and petrochemical plants. Their versatility also suits pulp & paper industries, food processing equipment, and cargo tanks for ships and trucks. In architecture and construction, they offer durable joining solutions where exposure to aggressive environments is frequent.

Offshore Industry

Nuclear Industries

Refineries

Ship Building

Aerospace

Pharmaceutical

Incoloy 800/800H/800HT Flanges Certifications & Compliance

All Incoloy 800/800H/800HT flanges strictly follow international standards like ASTM B564, ASME SB564, and EN/DIN norms, ensuring reliability for pressure equipment applications. With complete material traceability and QA/QC procedures, including NDT testing and inspection reports these flanges are produced in accordance with ISO 9001:2015 quality management systems. Complete chemical, mechanical and dimensional data are included in mill test certificates (EN 10204 3.1 / 3.2). Quality assurance is supported by third-party inspections from TUV, Lloyd’s Register, BV, SGS, or DNV. Flanges ensure international compliance and performance verification by adhering to PED 2014/68/EU, NACE MR0175, and AD 2000 W0.

Our Global Export Destinations

Midland Alloys Inc., headquartered in India, is a recognized exporter of Incoloy 800/800H/800HT Flanges, delivering to industrial hubs across the globe. With a strong export network, we consistently serve clients in the UAE, Saudi Arabia, Oman, Qatar, and Kuwait, meeting the high demands of the oil & gas and construction sectors.
We’re steadily expanding our footprint in Europe—particularly in Germany, the UK, France, and Italy—and in the Asia-Pacific markets such as Singapore, Malaysia, Indonesia, and South Korea. Emerging markets in South Africa, Egypt, Nigeria, and Brazil are also witnessing growing demand for our export-grade flange solutions.
Our exports are supported with complete customs documentation, durable packaging, and precise port logistics to ensure safe and on-time delivery. We’ve built long-term partnerships with project contractors, OEMs, government agencies, and distributors, making us a reliable global sourcing partner for specialty alloy flanges.

Why Choose Midland Alloys Inc.

Midland Alloys Inc. is an ISO 9001:2015 certified Incoloy 800 flange supplier, trusted for consistent quality and compliance. As an Incoloy 800HT global exporter, we maintain a reliable supply chain backed by timely international shipping. Our facility delivers custom machined Incoloy flanges with options like edge prep and heat-treated finishes. We provide clients with complete Incoloy flange documentation, including MTCs and third-party reports. Backed by 24/7 technical support, we ensure full traceability, professional guidance, and responsive after-sales service on every order.

FAQs

What is the difference between Incoloy 800, 800H, and 800HT flanges?

The main differences lie in carbon content and heat treatment. 800H has higher carbon than 800, improving strength at high temperatures, while 800HT offers better creep resistance due to tighter alloy controls.

What temperature range can Incoloy 800/800H/800HT flanges withstand?

They can typically withstand temperatures up to 1100°C, making them suitable for high-heat applications like heat exchangers and process heaters.

Can Incoloy 800/800H/800HT flanges be welded?

Yes, they can be welded using GTAW or SMAW methods, with proper filler metals and post-weld treatment for structural integrity.

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