Hastelloy C-276 (UNS N10276 / Alloy C276) – Supplier of Round Bars, Seamless Tubes & Plates | Shanghai Hangbo Alloy Group

By Shanghai Hangbo Alloy Group Co., Ltd. | ISO 9001:2015 Certified | Est. 2012 | Shanghai, China

Quick Answer: What Is Hastelloy C-276?

Hastelloy C-276 (UNS N10276 / W.Nr. 2.4819) is a premier nickel-molybdenum-chromium superalloy reinforced with tungsten, designed for exceptional resistance to a wide range of severely corrosive environments. It is widely considered the most versatile corrosion-resistant alloy available, offering outstanding protection against pitting, stress-corrosion cracking, and oxidizing atmospheres up to 1040°C (1900°F). Shanghai Hangbo Alloy Group supplies Hastelloy C-276 as precision round bars, seamless tubes, and plates, serving the global chemical processing, pollution control, and oil & gas sectors with full EN 10204 3.1 certification.

Key Properties at a Glance

Product Overview

Hastelloy C-276 (UNS N10276), often referred to simply as Alloy C276, is the industry standard for handling aggressive chemical media. Its low carbon content minimizes carbide precipitation during welding, allowing it to be used in the as-welded condition in most chemical processes. The high molybdenum (15-17%) and chromium (14.5-16.5%) content provide exceptional resistance to both reducing and oxidizing environments. Notably, it is one of the few materials capable of resisting the corrosive effects of wet chlorine gas, hypochlorite, and chlorine dioxide.

Top three properties:

1. Universal Corrosion Resistance: Resists a vast array of acids, including sulfuric, hydrochloric, and phosphoric.
2. Exceptional Pitting Resistance: High PREN value ensures stability in chloride-rich environments.
3. Excellent Weldability: Low carbon prevents sensitization and intergranular corrosion in weld zones.

Shanghai Hangbo Alloy Group Co., Ltd. (est. 2012) is a leading manufacturer and global supplier of Hastelloy C-276. Operating from our state-of-the-art facility in Shanghai, China, we serve clients in 32 countries with high-purity materials in round bars, seamless tubes, and plates. Our ISO 9001:2015 certified quality system ensures that every batch meets the critical performance demands of FGD systems and pharmaceutical reactors.

Executive Standards

Chemical Composition (wt.% per ASTM B574)

100% OES verified on every heat at Shanghai Hangbo Alloy Group.

Mechanical & Physical Properties

Room-Temperature Properties (Annealed)

High-Temperature Strength Retention

Heat Treatment

Hastelloy C-276 is typically used in the solution-annealed condition to ensure maximum corrosion resistance and ductility.

• Solution Annealing Temperature: 1100°C – 1150°C (2012°F – 2102°F).
• Soaking Time: 1 to 2 hours per inch of thickness.
• Cooling Method: Rapid air cool or water quench. Rapid cooling is mandatory to keep the high molybdenum content in solid solution and prevent the formation of deleterious mu-phases.
• Grain Size Control: Shanghai Hangbo maintains strict thermal controls to achieve a grain size of ASTM No. 5 or finer, optimizing the material for both toughness and corrosion stability.
• Aging: This alloy is not precipitation-hardenable. Prolonged exposure at high temperatures should be avoided to prevent secondary phase precipitation which can embrittle the material.

How Shanghai Hangbo Produces Hastelloy C-276

1. Round Bars & Forgings

1. Clean Melting: Vacuum Induction Melting (VIM) followed by Electroslag Remelting (ESR) for ultra-low carbon control (≤0.01%) and precise Mo/W ratios.
2. Forging: Precision hot forging in the 1000–1200°C window to refine the microstructure.
3. Annealing: High-temperature solution anneal at 1120°C followed by immediate water quenching.
4. Finishing: Centerless grinding to meet h9/h11 tolerances; surface Ra ≤ 0.8 µm surface finish.

2. Seamless Tubes & Pipes

1. Billet Extrusion: High-purity ESR billets extruded at 1100°C to form mother tubes.
2. Cold Processing: Precision multi-pass cold drawing or pilgering to reach final dimensions (OD 6mm–219mm).
3. Hydrogen Annealing: Solution annealing in a protective hydrogen atmosphere for a bright, passive surface.
4. NDT Verification: 100% Eddy Current and Hydrostatic testing to ensure pressure-tight integrity.

3. Plates, Sheets & Strips

1. Rolling: Hot rolling of slabs followed by precision cold rolling for gauges under 3mm.
2. Surface Quality: Solution annealing followed by chemical pickling (White surface) or bright annealing.
3. Flatness: Levelling to ≤ 3 mm/m flatness for precision fabrication.
4. Cutting: Custom cut-to-size using waterjet or laser cutting.

Industry Applications

Quality Assurance: 7-Stage Zero-Defect Inspection

1. OES/PMI Verification: 100% verification of chemical composition per heat number.
2. Hardness Testing: Verification of solution-annealed condition across the section.
3. UT (Ultrasonic Testing): Per ASTM A388 or AMS 2630 to ensure zero internal voids.
4. Corrosion Resistance Test: Periodic G48 or intergranular corrosion testing (Strauss test).
5. Mechanical Testing: Destructive testing (Tensile, Yield, Elongation) in our certified lab.
6. Grain Size Inspection: Per ASTM E112 to ensure No. 5 or finer.
7. Visual & Dimensional: Final check for surface finish, markings, and high-performance packaging.

Deliverables: ISO 9001:2015 certificate, EN 10204 3.1 MTC, and SGS/BV/TÜV reports on request.

Frequently Asked Questions

Q1: What is Hastelloy C-276 used for?

Hastelloy C-276 is primarily used for components in severely corrosive environments, including chemical reactors, flue gas desulfurization (FGD) scrubbers, subsea oil wellhead components, and pharmaceutical production equipment.

Q2: What is the density of Hastelloy C-276?

The density of Hastelloy C-276 is 8.89 g/cm³ (0.321 lb/in³).

Q3: What is the maximum service temperature of Hastelloy C-276?

Hastelloy C-276 is suitable for service up to 1040°C (1900°F) in oxidizing atmospheres, although its primary value is its resistance to aqueous corrosion at lower temperatures.

Q4: What is the melting point of Hastelloy C-276?

Hastelloy C-276 has a melting range of 1325°C to 1370°C (2415°F to 2500°F).

Q5: What is the tensile strength of Hastelloy C-276?

In the solution-annealed condition, Hastelloy C-276 provides a minimum room-temperature tensile strength of ≥ 690 MPa (100 ksi).

Q6: What is the yield strength of Hastelloy C-276?

The yield strength (0.2% offset) of annealed Hastelloy C-276 is typically ≥ 283 MPa (41 ksi) at room temperature.

Q7: What is the elongation of Hastelloy C-276?

Hastelloy C-276 offers excellent ductility, with a typical elongation of ≥ 40% in the annealed condition.

Q8: What are the full mechanical properties of Hastelloy C-276?

Hastelloy C-276 is characterized by its versatile tensile strength (690 MPa), yield strength (283 MPa), and high elongation (40%), combined with exceptional resistance to pitting, crevice corrosion, and stress-corrosion cracking.

Q9: What heat treatment does Hastelloy C-276 require?

It requires solution annealing at 1100°C – 1150°C followed by rapid cooling to prevent deleterious phase precipitation.

Q10: What is the solution annealing temperature for Hastelloy C-276?

The standard solution annealing temperature is between 1100°C and 1150°C.

Q11: How does Hastelloy C-276 compare to Inconel 625?

Hastelloy C-276 generally offers better resistance to highly reducing environments like hydrochloric acid, while Inconel 625 is slightly better for high-temperature oxidation and cyclic fatigue.

Q12: What is the price of Hastelloy C-276 per kg?

Pricing is influenced by the current molybdenum (16%) and nickel market prices. Please contact Shanghai Hangbo Alloy Group at specialalloy001@gmail.com or hangbo@nickel-alloy.com for a real-time quote.

Q13: Is Hastelloy C-276 weldable?

Yes, Hastelloy C-276 has excellent weldability. Its low carbon content prevents sensitization during welding. Matching filler wire (ERNiCrMo-4) is recommended.

Q14: What product forms does Shanghai Hangbo supply?

We supply Hastelloy C-276 in round bars (6mm–400mm), seamless tubes, plates, sheets, and custom-forged components.

Q15: Does Shanghai Hangbo ship internationally?

Yes. We export to over 32 countries with full customs support and door-to-door delivery options (DDP/DAP).

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Shanghai Hangbo Alloy Group Co., Ltd. — Your Trusted Partner for Universal Corrosion Resistance.