Hastelloy C276 Seamless Tube

UNS N10276 | 2.4819 | ASTM B622

Hastelloy C276 Seamless Tube (N10276 / 2.4819) is manufactured to ASTM B622 from tube billet, cold-drawn to the required outside diameter and wall thickness. Supplied from our Wenzhou mill with EN 10204 3.1 mill test certificate, PMI and dimensional inspection on request.

Quantity:

Contact Now

What Is a Seamless Hastelloy C276 Tube?

Hastelloy C276 (UNS N10276) is a nickel-molybdenum-chromium alloy with a small but critical tungsten addition, widely regarded as the most versatile corrosion-resistant alloy in common use. It resists oxidising and reducing media simultaneously, tolerates both wet chlorine and hypochlorite, and is one of the few alloys that survives chloride-induced pitting and stress-corrosion cracking in acidic chloride service.

Hastelloy C276 Key Features and Technical Advantages

Feature	Description
Versatile Corrosion Resistance	Hastelloy C276 resists oxidising and reducing media simultaneously, covering duties that no single-mode alloy can handle.
Excellent Resistance to Pitting and Crevice Attack	The molybdenum-tungsten combination delivers high resistance to localised corrosion in chloride-bearing environments.
Resistance to Wet Chlorine and Hypochlorite	C276 is one of very few alloys that tolerate wet chlorine gas, hypochlorite and chlorine dioxide service.
Immunity to Chloride Stress-Corrosion Cracking	The nickel-rich chemistry makes C276 essentially immune to chloride SCC, even at elevated temperature.
Reliable Fabrication	The alloy is readily welded and formed, with matching filler metal available for corrosion-resistant joints.

Hastelloy C276 Product Specifications and Data

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Hastelloy C276.

The composition of Hastelloy C276 is carefully balanced to achieve its superior corrosion resistance and high strength.

Ni	Cr	Mo	Fe	W	C	Si	Co	Mn	V	P	S
Bal	14.50-16.50	15.00-17.00	4.00-7.00	3.00-4.50	≤0.01	≤0.08	≤2.50	≤1.00	≤0.35	≤0.04	≤0.03

Hastelloy C276 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.

Tensile Strength	Yield Strength	Elongation	Hardness
≥ 690 MPa	≥ 283 MPa	≥ 40%	≤ 100 HRB

These physical properties highlight the material's ability to perform reliably under a wide range of conditions.

Density	Melting Point	Thermal Expansion	Thermal Conductivity	Modulus of Elasticity	Electrical Resistivity
8.89 g/cm³	1325-1370 ℃	11.2 µm/m·℃	10.2 W/m·K	205 GPa	1.30 µΩ·m

Hastelloy C276 Dimensional Standards and Tolerances

Hastelloy C276 seamless tubes are supplied to the dimensional tolerances of ASTM B622 / B829 unless a tighter project specification applies.

Hastelloy C276 Common Industrial Applications

Industry	Typical Applications
Chemical Processing	Reactors and heat exchangers Wet chlorine and hypochlorite service Mixed-acid handling lines
Pollution Control and Flue-Gas Desulphurisation	Scrubbers and absorber internals Duct and stack linings Waste-gas handling equipment
Pulp and Paper Industry	Digesters and bleach plant equipment Liquor handling lines Heat exchangers
Pharmaceutical and Fine Chemicals	Reactor vessels Purification and separation equipment Corrosive transfer lines
Offshore and Marine Engineering	Seawater handling systems Firewater and deluge pipework Offshore process equipment

Hastelloy C276 Quality Assurance and Production Process

Process Step	Description
Certification	All Hastelloy C276 tubes are supplied to ASTM B622 / ASME SB622 and ASTM B619 / ASME SB619 with EN 10204 3.1 mill test certificates. Third-party inspection (SGS, BV, TUV, Lloyd's), PMI reports and full heat-number traceability can be provided on request.
Non-Destructive Testing (NDT)	Hydrostatic or eddy-current testing is performed on 100% of tubes. Ultrasonic testing (UT) and dye-penetrant inspection (PT) are available for critical service, with records retained for each production lot.
Material Verification	Positive Material Identification (PMI) and spectrometric analysis confirm that the chemical composition matches the ordered grade. Intergranular corrosion (IGC) testing to ASTM A262 Practice E is available for austenitic and nickel-alloy tubes.
Mechanical Testing	Tensile, yield, elongation and hardness tests are carried out per heat. Flattening, flaring and reverse-bend tests verify ductility, while creep-rupture data can be supplied for high-temperature grades.
Dimensional Inspection	Outside diameter, wall thickness, ovality and straightness are measured against ASTM A1016 / A1016M or EN 10216-5 tolerances. Length, square-cut ends and end-finish conditions are verified before packing.

Hastelloy C276 vs C22 / B2 – Technical Comparison

C276 is the most widely specified corrosion-resistant nickel alloy. C22 improves its oxidising performance and B2 covers the pure reducing-acid case more economically.

Chemistry

C276: Ni-Mo-Cr with tungsten, approximately 16% Mo and 15.5% Cr
C22: Ni-Cr-Mo with tungsten, approximately 13% Mo and 22% Cr
B2: Ni-Mo with very low chromium, for reducing media only

Corrosion Envelope

C276 resists both oxidising and reducing media and is essentially immune to chloride stress-corrosion cracking. C22 shifts the balance toward oxidising acids and chloride pitting because of its higher chromium, at a small cost in some reducing duties. B2 covers reducing acids only.

Wet Chlorine and Hypochlorite

C276 and C22 both tolerate wet chlorine, hypochlorite and chlorine dioxide service — a capability almost unique to this alloy family and the reason it is standard in bleach and pulp-bleaching plants.

Selection Guide

Choose Hastelloy C276 for the broadest mixed-chemistry duty and where field experience is the priority
ChooseHastelloy C22 where oxidising acids or chloride pitting dominate
ChooseHastelloy B2 only for pure reducing-acid service

Frequently Asked Questions About Hastelloy C276 Seamless Tubes

What is a Hastelloy C276 seamless tube?

Hastelloy C276 (UNS N10276) is a nickel-molybdenum-chromium alloy tube with a tungsten addition, produced without a longitudinal weld. It resists both oxidising and reducing media and is one of the most versatile corrosion-resistant alloys in common use.

What makes Hastelloy C276 different from other nickel alloys?

Its combination of molybdenum, chromium and tungsten lets it handle oxidising and reducing media simultaneously, tolerate wet chlorine and hypochlorite, and resist chloride-induced pitting, crevice attack and stress-corrosion cracking. Few alloys cover that range.

What is Hastelloy C276 tube used for?

C276 is used for reactors and heat exchangers in chemical processing, wet chlorine and hypochlorite service, flue-gas desulphurisation scrubbers, pulp and paper bleach plants, and pharmaceutical and fine-chemical equipment handling mixed corrosive media.

What standards cover Hastelloy C276 tube?

Hastelloy C276 seamless tube is supplied to ASTM B622 / ASME SB622, with ASTM B829 covering general requirements and ASTM B619 / ASME SB619 applying to welded pipe.

Request a Hastelloy C276 Tube Quotation

Send your Seamless Hastelloy C276 Tube enquiry with grade, application, size (OD and wall thickness or schedule), quantity, length, end finish and inspection requirements. Our technical team will confirm availability, testing scope and lead time.

Request a Hastelloy C276 Tube Quotation