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Hastelloy C-276 Flanges

Hastelloy C-276 Flanges are designed for piping and equipment connections exposed to highly aggressive chemical media. Their nickel-molybdenum-chromium construction withstands wet chlorine, strong acids, chlorides, and oxidizing or reducing conditions, while helping prevent pitting, crevice corrosion, and premature joint failure.
Available in configurations such as weld neck, slip-on, blind, socket weld, and threaded designs, these flanges provide dependable alignment and sealing for critical process systems. They are commonly used in chemical processing, pollution-control equipment, petrochemical plants, offshore facilities, and other applications where long-term corrosion resistance is essential.

 

 

 

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Product Overview

Hastelloy C-276 Flanges for High-Performance Applications

Explore detailed information for this alloy product, including specifications, applications, supply options and quotation requirements.

Why buyers choose Hastelloy C-276 Flanges

Hastelloy C-276 Flanges are designed for piping and equipment connections exposed to highly aggressive chemical media. Their nickel-molybdenum-chromium construction withstands wet chlorine, strong acids, chlorides, and oxidizing or reducing conditions, while helping prevent pitting, crevice corrosion, and premature joint failure.
Available in configurations such as weld neck, slip-on, blind, socket weld, and threaded designs, these flanges provide dependable alignment and sealing for critical process systems. They are commonly used in chemical processing, pollution-control equipment, petrochemical plants, offshore facilities, and other applications where long-term corrosion resistance is essential.

 

 

 

Hastelloy C-276 Flanges
Pipe Specifications

Hastelloy C-276 Flanges size range and supply information

Specifications, available sizes and delivery conditions can vary by production route and order requirements. Contact us for current availability.

Item Typical Options Buyer Notes Typical Specification
Material Grade Hastelloy C-276 / UNS N10276 / W.Nr. 2.4819 Confirm the alloy designation, chemical composition and certification requirements. Nickel-molybdenum-chromium alloy for severe corrosive and chemical service
Flange Type Weld neck, slip-on, blind, socket weld, threaded, lap joint or orifice flange Select the flange type according to piping design, welding method and maintenance requirements. Forged flanges for pressure piping and equipment connections
Nominal Size NPS 1/2 to NPS 24, DN15 to DN600 or custom dimensions Provide nominal size, bore diameter and mating pipe dimensions. Standard and custom sizes available according to project drawings
Pressure Class Class 150, 300, 600, 900, 1500 or 2500 Confirm pressure class, temperature rating and applicable piping code. Pressure-rated configurations for high-corrosion applications
Facing Type Raised face, flat face, ring-type joint or male-and-female face Match the facing type with the gasket, bolts and connecting flange. RF, FF and RTJ facing options available
Applicable Standard ASTM B564, ASME SB564, ASME B16.5, ASME B16.47 or project specification Confirm the required material, dimensional and pressure-rating standards. ASTM / ASME compliant forged flanges
Manufacturing & Finish Forged, hot formed, machined, pickled, passivated or polished Specify machining tolerances, surface finish and bolt-hole dimensions. Precision-machined flange faces with controlled dimensions
Inspection & Certification MTC, PMI, chemical analysis, hardness test, UT, dimensional inspection and third-party inspection Confirm NDE scope, documentation and full heat traceability requirements. EN 10204 3.1 certificate and inspection dossier available

 

 

 

Standards

Common standards for Hastelloy C-276 Flanges

The final standard should follow the purchase order, engineering specification or project drawing.

Product Type Common Standards Typical Use Inspection Notes
Hastelloy C-276 Weld Neck Flanges ASTM B564 / ASME SB564, ASME B16.5, ASME B16.47 High-pressure chemical piping, pollution-control systems, offshore equipment and severe corrosion service Verify flange dimensions, pressure class, bore, weld bevel, PMI, NDT and material traceability.
Hastelloy C-276 Slip-On Flanges ASTM B564 / ASME SB564, ASME B16.5 Fabricated process piping and general-purpose corrosion-resistant connections Inspect outside diameter, bolt-hole alignment, facing, bore dimensions and surface condition.
Hastelloy C-276 Blind Flanges ASTM B564 / ASME SB564, ASME B16.5, ASME B16.47 Closing pipe ends, pressure testing and isolating chemical-processing equipment Check thickness, flatness, pressure rating, bolt-hole pattern, PMI and ultrasonic examination.
Hastelloy C-276 Socket Weld Flanges ASTM B564 / ASME SB564, ASME B16.5 Small-bore high-pressure piping, instrumentation and corrosive fluid connections Verify socket dimensions, bore, pressure class, facing, PMI and dimensional tolerances.
Hastelloy C-276 Threaded Flanges ASTM B564 / ASME SB564, ASME B16.5 Low-to-medium diameter piping where welding is impractical or undesirable Inspect thread accuracy, thread engagement, flange facing, dimensions and material certificates.
Hastelloy C-276 Lap Joint Flanges ASTM B564 / ASME SB564, ASME B16.5 Systems requiring frequent dismantling, alignment adjustment or corrosion-resistant contact surfaces Check stub-end fit, bore alignment, facing, bolt-hole dimensions, PMI and surface quality.
Custom Hastelloy C-276 Flanges ASTM B564 / ASME SB564, ASME B16.47, customer drawings Specialized chemical, pharmaceutical, marine and pollution-control applications Review drawings, machining tolerances, pressure testing, NDT, PMI and inspection certificates.

 

 

 

Chemical Composition

Hastelloy C-276 Flanges composition reference

Chemical composition is reported by heat on the material test certificate. Use the table below as a material-selection reference.

Element Symbol Typical Requirement Function
Nickel Ni Balance Forms the alloy matrix and provides toughness and broad corrosion resistance.
Molybdenum Mo 15.0-17.0 Enhances resistance to pitting, crevice corrosion, and reducing acids.
Chromium Cr 14.5-16.5 Improves resistance to oxidizing media and localized corrosion.
Iron Fe 4.0-7.0 Provides controlled alloy balance and contributes to flange strength.
Tungsten W 3.0-4.5 Improves localized corrosion resistance and high-temperature strength.
Cobalt Co 2.5 max Controlled residual element in the nickel-based alloy.
Manganese Mn 1.0 max Acts as a deoxidizer during alloy production.
Vanadium V 0.35 max Contributes to strengthening and microstructural stability.
Silicon Si 0.08 max Controlled to maintain ductility, surface quality, and flange reliability.
Carbon C 0.010 max Minimized to reduce carbide precipitation and preserve corrosion resistance.
Copper Cu 0.50 max Controlled minor element supporting alloy stability.

 

 

 

Mechanical Properties

Mechanical Properties of Hastelloy C-276 Flanges

Mechanical properties vary by standard, pipe size, production route and heat treatment. Use the specified standard and MTC as the final acceptance basis.

Condition / Product Tensile Strength Yield Strength 0.2% Elongation Notes
Forged Hastelloy C-276 flanges 690 MPa min reference 283 MPa min reference 40% min reference Common reference condition for severe chemical-processing and corrosion-resistant piping systems.
Annealed Hastelloy C-276 flanges By ASTM / ASME specification By ASTM / ASME specification By ASTM / ASME specification Provides a balance of strength, ductility, and resistance to pitting and crevice corrosion.
Weld-neck Hastelloy C-276 flanges By applicable ASTM / ASME specification By applicable ASTM / ASME specification By applicable ASTM / ASME specification Specify weld procedure, bore dimensions, pressure class, facing, and inspection requirements.
Custom Hastelloy C-276 flanges By design and purchase specification By design and purchase specification By design and purchase specification Confirm flange type, dimensions, drilling, heat treatment, surface finish, and material traceability.

 

 

 

Values shown are reference data for product selection. Purchase orders should define the exact standard, condition, inspection scope and certificate requirement.

Quotation Checklist

Information to confirm for your order

Share your requirements, including material, size, quantity, and specifications, for a fast quotation.

Material

Grade name, UNS number, equivalent grade or project material code.

Pipe Size

OD / NPS, wall thickness or schedule, length, tolerance and quantity.

Standard

ASTM, ASME, EN, DIN, drawing or customer specification.

Condition

Seamless, welded, annealed, solution annealed, pickled or polished.

Inspection

MTC EN10204 3.1, PMI, UT / ET, hydrotest and dimensional report.

Delivery

Destination, packing requirement, shipping method and delivery deadline.

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FAQ

Frequently asked questions about Hastelloy C-276 Flanges

FAQ content helps cover buyer questions and supports SEO for long-tail product searches.

Hastelloy C-276 Flanges are used in chemical processing, flue gas desulfurization, pollution-control systems, marine equipment, oil and gas facilities and other highly corrosive piping applications.

Available types include weld neck, slip-on, blind, socket weld, threaded, lap joint, reducing and spectacle blind flanges. Custom configurations can also be manufactured.

Material is commonly supplied to ASTM B564 or ASME SB564, while dimensions may follow ASME B16.5, ASME B16.47, MSS SP-44 or customer project specifications.

Hastelloy C-276 Flanges are available in classes 150, 300, 600, 900, 1500 and 2500 with RF, FF, RTJ or other facing types according to the piping design.

Inspection may include dimensional checks, visual examination, hardness testing, positive material identification, chemical analysis, mechanical testing, liquid penetrant testing and ultrasonic testing when specified.

Yes. Flanges can be manufactured to customer drawings with special bolt-hole patterns, non-standard dimensions, customized facings, tolerances, markings and inspection plans.

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