Hastelloy C276 Flanges

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Hastelloy C276 Flanges Technical Specifications

Feature	Details
Specifications	ASTM B564 / ASME SB564 / DIN 17744
Grade	UNS N10276 (Hastelloy C276, Alloy C276)
Material Designation	Nickel-Chromium-Molybdenum-Tungsten Alloy (Ni-Cr-Mo-W)
UNS Number	N10276
Werkstoff Number	2.4819
Dimensional Standards	ANSI/ASME B16.5, B16.47 Series A & B, B16.48, MSS SP-44
Size Range	1/2" (15 NB) to 60" (1500 NB)
Pressure Class	150#, 300#, 400#, 600#, 900#, 1500#, 2500# (B16.5); 75#, 150#, 300#, 400#, 600#, 900# (B16.47)
Flange Types	Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice, Long Weld Neck, Reducing
Flange Face	Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female, Tongue & Groove
Manufacturing Type	Hot Forged
Microstructure	Austenitic (FCC) Solid Solution (Solution Annealed)
Heat Treatment	Solution Annealed at 1120-1180-C + Rapid Water Quench (Mandatory)
Testing	Tensile, Hardness, Impact, PMI, Ferrite Detection, Ultrasonic
Inspection	Third Party Inspection by TUV, SGS, Bureau Veritas, Lloyd's, DNV GL, BV, ABS
Certifications	EN 10204 3.1B MTC, NACE MR0175/ISO 15156, PED 2014/68/EU, CE Marked, ASME B31.3

Hastelloy C276 Equivalent Grades

Standard	USA	Germany	Europe	Japan	UK	China
Hastelloy C276	UNS N10276	2.4819	2.4819	NCF 276	NA 24	NS334
	ASTM B564 N10276	NiMo16Cr16Ti	NiMo16Cr16Ti			NS3308
	Alloy C276	W.Nr. 2.4819
	Hastelloy C-276

Hastelloy C276 Chemical Composition

Mechanical Properties of Hastelloy C276 Flanges

Property	Requirement (Solution Annealed)	Testing Standard
Tensile Strength	690 MPa (100 ksi) minimum	ASTM E8
Yield Strength (0.2% offset)	310 MPa (45 ksi) minimum	ASTM E8
Elongation in 2"	40% minimum	ASTM E8
Hardness (Brinell)	180-230 HB (typical)	ASTM E10
Hardness (Rockwell B)	85-92 HRB (typical)	ASTM E18
Charpy V-Notch Impact	Excellent toughness	ASTM E23
Density	8.89 g/cm- (0.321 lb/in-)	-

Hastelloy C276 Flange Dimensions & Pressure Rating Chart

Temperature -F (-C)	Class 150	Class 300	Class 600	Class 900	Class 1500	Class 2500
-20 to 100 (-29 to 38)	285 psi	740 psi	1480 psi	2220 psi	3705 psi	6170 psi
200 (93)	260 psi	675 psi	1350 psi	2025 psi	3375 psi	5625 psi
400 (204)	218 psi	565 psi	1130 psi	1695 psi	2825 psi	4710 psi
600 (316)	170 psi	440 psi	880 psi	1320 psi	2200 psi	3665 psi
800 (427)	128 psi	330 psi	660 psi	990 psi	1650 psi	2750 psi
1000 (538)	85 psi	220 psi	440 psi	660 psi	1100 psi	1835 psi
1200 (649)	60 psi	155 psi	310 psi	465 psi	775 psi	1290 psi
1400 (760)	43 psi	111 psi	223 psi	334 psi	557 psi	928 psi

Types of Hastelloy C276 Flanges Available

Flange Type	Description
Weld Neck (WN)	Butt-welded connection with long tapered hub for high-pressure chemical processing applications
Slip-On (SO)	Slides over pipe for fillet welding, suitable for low-pressure corrosive service
Blind (BL)	Solid disc for closing pipe ends in chemical reactors and pressure vessels
Socket Weld (SW)	Internal socket design for small bore piping in pharmaceutical and chemical plants
Lap Joint (LJ)	Loose flange with stub end for systems requiring frequent dismantling
Threaded (TH)	NPT/BSP threaded connection for non-welded corrosive applications
Orifice	Flow measurement flanges for chemical processing and pollution control systems
Long Weld Neck	Extended neck design for high thermal stress applications and nozzle connections
Reducing	Different bore sizes on each side for transitioning pipe diameters in corrosive service

Standard Flange Sizes & Weight Chart

Hastelloy C276 Weld Neck Flange Dimensions (ANSI B16.5) - Class 600 Sample

Is Hastelloy C276 Good Quality for the Most Versatile Corrosion Resistance?

Yes, it is universally accepted that Hastelloy C276 (Alloy C276, UNS N10276) is the most widely used and versatile nickel based corrosion resistant alloy in the world, with excellent resistance to oxidizing and reducing as well as crevicing corrosion and chloride stress corrosion cracking. Hastelloy C276 was invented by Haynes International in the 1960s and has developed to be the global industry standard with a service record of more than 50 years applied through the widest variety of corrosive service.

Their balanced nature (15-17% molybdenum, 14.5-16.5% chromium, and 3-4.5% tungsten), results in Hastelloy C276 having an incredible range of application that most other alloys do not have. The excessive molybdenum content provides excellent resistance to reducing acids (hydrochloric, sulfuric) and offers excellent pitting and crevice corrosion resistance with a Pitting Resistance Equivalent Number (PREN) of about 68-72, which is far superior to the austenitic stainless steels, and comparable to the super duplex grades. Durability to oxidizing acids (nitric acid, ferric/cupric salts) and desirable oxidation resistance at high temperatures are guaranteed by the composition of chromium.

Its addition of tungsten increases corrosion resistance not only in reducing but also in oxidizing conditions especially in hydrochloric acid and presence of chloride ions. The minimal amount of carbide (0.02% maximum) reduces the amount of carbide that can be deposited in the weld heat-affected areas and C276 can be used in the as-welded state in most applications without after-weld heat treatment.

Numerous decades of field service and laboratory tests prove the better functionality of Hastelloy C276. At sulfuric acid service, C276 exhibits superior performance over the entire concentration limit of both dilute and concentrated as well as ambient and boiling temperatures with the corrosion rates normally less than 1 mm/year in most sulfuric acid environments where the stainless steels perform disastrously. C276 is a good hydrochloric acid alloy when it comes to intermediate HCl concentration and temperature but specialized alloys, such as B2/B3, might be even desired when it concerns the extreme HCl service.

Where the environment is oxidizing (such as wet chlorine, hypochlorite solutions, and chlorine dioxide) C276 works well but better than C22 is found in the most oxidizing environments. C276 is the material to use in mixed acid environments and changing oxidizing/reducing environments. The alloy is totally immune to chloride stress corrosion cracking, and therefore it is preferable in seawater service, offshore oil and gas services, as well as in chloride contaminated environment.

Hastelloy C276 is highly sour-service-resistant to hydrogen sulfide (H2S) and carbon dioxide (CO2), and is very commonly used as an offshore oil and gas production equipment, wellhead component, subsea manifold, and pipeline system specification. The alloy is certified to sour service requirement standards of NACE MR0175/ ISO 15156. C276 demonstrates better crevice corrosion resistance in stagnant conditions than in seawater and in brine service, C276 is notably better than the super duplex stainless steels.

The alloy can withstand high temperatures of up to 1900degF (1040degC) in high temperatures in most environments with great corrosion resistance. C276 exhibits good oxidation resistance in oxygenating atmospheres, although the use of special high-temperature alloys can be used at temperatures higher than 1200degF. C276 is corrosion resistant and has the strength to withstand high temperatures hence it is applicable in chemical reactors, distillation columns, heat exchangers and piping systems that operate at high temperatures.

Other important applications of C276 globally are chemical processing equipment (sulfuric acid plants, hydrochloric acid service, phosphoric acid production plants, acetic acid plants), pollution control (flue gas desulfurization systems, wet scrubbers) and pulp and paper (chlorine dioxide generators, bleach plants), pharmaceutical (multipurpose reactors, clean-in-place systems) waste treatment (incineration scrubbers, chemical oxidation), offshore oil and gas (subsea equipment, wellheads, manifolds, sour service, nuclear waste

The main factor when using Hastelloy C276 is that more recent alloys such as C22 have slight improvements in just a few environments (in team oxidizing chloride service) at slightly greater cost. Yet, C276 has a decades long record of use, is widely available, has a wide range of corrosion data, extensive experience with fabricators and has a lower cost than C22, so it is the industry standard in all but a few corrosive applications. C276 is the best combination of versatile corrosion resistance, mechanical properties, weldability, available and economic considerations.

Heat Treatment & Testing Requirements

Heat Treatment Requirements (Mandatory)

Process	Step / Parameter	Requirement	Remarks
Solution Annealing + Rapid Quenching	Solution Annealing Temperature	1120-1180-C (2050-2150-F)	Optimal for complete carbide dissolution
	Holding Time	Adequate soaking	Based on section thickness, typically 30+ min
	Cooling After Annealing	Rapid water quench	Essential for single-phase austenitic structure
Critical Cooling Rate	Fast cooling through critical range	Slow cooling causes carbide precipitation	Critical Requirement
Ferrite-free structure	Must be fully austenitic	Verify with ferrite detector

Testing & Inspection Requirements (Comprehensive)

Test / Inspection	Standard / Requirement	Acceptance / Remarks
Tensile Testing	ASTM E8	Yield = 45 ksi (310 MPa), Tensile = 100 ksi (690 MPa), Elongation = 40%
Hardness Testing	ASTM E10 / E18	Typical 180-230 HB (85-92 HRB)
Charpy Impact Testing	ASTM E23	Excellent toughness from cryogenic to elevated temperatures
PMI Testing	Positive Material Identification	Ni (=57%), Mo (15-17%), Cr (14.5-16.5%), W (3-4.5%)
Ferrite Detection	Ferritescope / Magnetic test	Must be ferrite-free (0% ferrite)
Ultrasonic Testing	ASTM A388	Mandatory for critical offshore and chemical applications
Pitting Corrosion Testing	ASTM G48 Method A (optional)	Verification of PREN and chloride resistance

Hastelloy C276 Nickel-Chromium-Molybdenum-Tungsten Alloy Flanges Price List 2026

Flange Type	Size Range	Pressure Class	Indicative Price Range (USD/Piece)
Weld Neck (WN)	1/2" - 2"	150#	$145 - $365
Weld Neck (WN)	4" - 8"	150#	$605 - $2,285
Weld Neck (WN)	10" - 24"	150#	$3,620 - $13,050
Weld Neck (WN)	1/2" - 2"	300#	$215 - $535
Weld Neck (WN)	4" - 8"	300#	$915 - $3,305
Weld Neck (WN)	10" - 24"	300#	$5,235 - $18,850
Weld Neck (WN)	1/2" - 2"	600#	$325 - $785
Weld Neck (WN)	4" - 8"	600#	$1,435 - $4,955
Slip-On (SO)	1/2" - 2"	150#	$122 - $305
Slip-On (SO)	4" - 8"	150#	$505 - $1,845
Blind (BL)	1/2" - 2"	150#	$108 - $275
Blind (BL)	4" - 8"	150#	$525 - $2,075
Socket Weld (SW)	1/2" - 2"	150# - 600#	$158 - $675

Applications of Hastelloy C276 Flanges in Industry

The use of Hastelloy C276 flanges is mostly common in industries where such qualities like high strength, resistance to oxidation, and stability at high temperatures are needed.

• Chemical Processing: Sulfuric acid plants, hydrochloric acid service, phosphoric acid production, acetic acid plants
• Pollution Control: Flue gas desulfurization (FGD) systems, wet scrubbers, stack liners
• Pulp & Paper: Chlorine dioxide generators, bleach plants, digester systems
• Pharmaceutical: Multipurpose reactors, clean-in-place (CIP) systems, process vessels
• Waste Treatment: Incineration scrubbers, chemical oxidation systems, hazardous waste handling
• Offshore Oil & Gas: Subsea equipment, wellheads, manifolds, sour service piping
• Geothermal: Well casings, surface equipment, heat exchangers
• Petrochemical: Acetic acid production, ethylene dichloride cracking, various process equipment

Why Choose Hastelloy C276 Flanges from Metinox Overseas?

Metinox Overseas is supplying certified Hastelloy C276 (Alloy C276) nickel-chromium-molybdenum-tungsten alloy flanges, with precise solution annealing between 1120-1180.C., fast quenching in water, and extensive testing of the most versatile corrosive-resistant applications in the world. Our ISO 9001:2015, NACE MR0175/ ISO 15156 and PED certified production sites and facilities have full heat treatment records. All flanges have EN 10204 3.1B Mill Test Certificates with full chemical analysis (Ni =57, Mo =15-17, Cr =14.5-16.5, W =3-4.5, C =0.02), full tensile (tensile =100ksi, yield =45ksi, elongation =40 percent), hardness (0 percent ferrite), PREN (=68) and PMI. The technical department offers our expertise in selecting material to use in sulfuric/hydrochloric acid service, FGD systems, offshore sour service, and welding procedures (AWS A5.14 ERNiCrMo-4 filler metal) and compliance with ASME B31.3 to the chemical processing plants, offshore platforms, pollution control systems, pulp and paper mills, pharmaceutical plants, and multi purpose corrosion applications all over the world.

Hastelloy C276 Flange Delivery Time & CIF Pricing by Country

Destination Region	Major Ports / Cities	Estimated Delivery Time	Typical CIF Terms
Middle East (GCC)	Dubai, Dammam, Doha	14-18 Days	CIF Dubai / CIF Dammam
Europe	Rotterdam, Hamburg	28-35 Days	CIF Rotterdam / CIF Hamburg
USA & Canada	Houston, New York	35-45 Days	CIF Houston / CIF New York
Southeast Asia	Singapore, Port Klang	18-25 Days	CIF Singapore / CIF Port Klang
Africa	Lagos, Durban	25-35 Days	CIF Lagos / CIF Durban

Other Types of Hastelloy C276 Flanges

ASTM B564 N10276 Flanges, UNS N10276 Weld Neck Flanges, Hastelloy C276 Blind Flanges, Alloy C276 Sulfuric Acid Flanges, Hastelloy C276 FGD Flanges, Alloy C276 Sour Service Flanges.

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