Introduction

Hastelloy C276 Alloy (UNS N10276) is a nickel-molybdenum-chromium alloy with tungsten additions, engineered for the most aggressive chemical environments where other alloys fail. This corrosion resistant nickel alloy contains approximately 57% nickel, 15–17% molybdenum, 14.5–16.5% chromium, 3–4.5% tungsten, and 4–7% iron. The alloy is recognized as the "universal" corrosion-resistant alloy, offering unmatched resistance to pitting, crevice corrosion, and stress corrosion cracking across both oxidizing and reducing media. Available in Hastelloy C276 plate, sheet, pipe, tube, bar, wire, fittings, and flanges, in hot rolled, cold rolled, cold drawn, annealed, and solution annealed conditions. This nickel-molybdenum-chromium alloy is the preferred material for chemical processing, oil and gas, flue gas desulfurization, pollution control, pharmaceutical equipment, power generation, and marine applications.

Chemical components(%)

Mechanical properties

Physical properties

Hastelloy C276 Available Products and Standard

1. ASTM B575 (Standard Specification for Hastelloy C276 Alloy Plate, Sheet, and Strip)

Type: Sheet/Strip/Plate

Size Range:

• Hastelloy C276 Sheet,Plate: 0.5 – 180 mm thick (cold rolled or hot rolled)

• Hastelloy C276 Strip: 0.01 – 5.0 mm thick × 5 – 500 mm wide

Surface: Annealed, Bright, Pickled, Ground

Testing: Chemical analysis, mechanical test (tensile, yield, elongation), intergranular corrosion test, hardness test, dimensional inspection

2. ASTM B574 (Standard Specification for Hastelloy C276 Alloy Rod and Bar)

Type: Bar/Wire/Round bar

Size Range:

• Hastelloy C276 Bar: 8 – 355 mm dia (hot rolled or cold drawn)

• Hastelloy C276 Wire: 0.01 – 15.0 mm dia (coils or straight)

Surface: Annealed, Bright, Pickled, Ground

Testing: Chemical analysis, mechanical test (tensile, yield, elongation), hardness test, corrosion test, dimensional inspection

3. ASTM B622 (Seamless Pipe & Tube) / ASTM B619 (Welded Pipe)

Type: Seamless tube//Welded pipe/Fittings

Size Range: 

• Hastelloy C276 Seamless Tube: OD 6 – 273 mm

• Hastelloy C276 Welded Pipe: OD up to 610 mm

Surface: Annealed, Pickled

Testing: Flattening test, hydrostatic test, eddy current test, chemical analysis, mechanical test

Applications

1. Chemical Processing & Petrochemical Industry

• In chemical processing reactors, heat exchangers, and distillation columns handling aggressive media, Hastelloy C276 plate and UNS N10276 pipe deliver benchmark corrosion resistance against sulfuric acid, hydrochloric acid, phosphoric acid, and chlorinated organics. This acid resistant Hastelloy C276 withstands wet chlorine gas, hypochlorite, and chlorine dioxide—environments where stainless steels rapidly fail.

• For organic chloride processes and processes utilizing halide or acid catalysts, Alloy C276 seamless pipe provides chloride resistant alloy performance with immunity to stress corrosion cracking.

• In petrochemical furnace systems and high-temperature process equipment, Hastelloy C276 tube retains mechanical strength up to 1900°F (1038°C) with excellent oxidation resistance.

2. Oil & Gas Industry

• For oil and gas production equipment handling sour gas (H₂S/CO₂), Hastelloy C276 pipe is specified for pumping systems, suction pipes, fittings, and probes in contact with corrosive well fluids. This corrosion resistant Hastelloy C276 is NACE MR0175 compliant for sour service applications.

• For offshore platforms and subsea equipment, UNS N10276 tube withstands seawater corrosion, chloride attack, and the corrosive effects of wet H₂S environments.

3. Flue Gas Desulfurization & Pollution Control

• In flue gas desulfurization (FGD) scrubbers, stack-gas reheaters, and absorber towers, Hastelloy C276 plate withstands the highly corrosive, low‑pH, chloride‑rich environments characteristic of FGD systems. The alloy's resistance to pitting and crevice corrosion ensures long service life in wet and corrosive zones.

• For pollution control equipment including waste incineration scrubbers and industrial waste treatment systems, Alloy C276 sheet provides pitting corrosion resistant alloy performance in aggressive chemical environments.

4. Pharmaceutical Equipment & Power Generation

• For pharmaceutical reactors, API synthesis vessels, and clean‑in‑place systems, Hastelloy C276 bar and tube maintain product purity with non‑contaminating corrosion resistance in high‑temperature sterilization cycles.

• In power generation applications including industrial furnaces and gas turbine components, Hastelloy C276 alloy retains mechanical strength at extreme temperatures with excellent resistance to thermal stress.

5. Marine Engineering & Heat Exchangers

• For marine engineering applications including seawater cooling systems and offshore equipment, UNS N10276 pipe resists chloride‑induced pitting and crevice corrosion in warm, high‑chloride marine environments.

• For shell‑and‑tube heat exchangers, condenser tubing, and reboiler bundles in aggressive chemical service, Hastelloy C276 seamless tube combines high thermal conductivity with outstanding resistance to localized attack.

FAQ – Hastelloy C276 Alloy

Q: What is the difference between Hastelloy C276 and Hastelloy C22?

A: Hastelloy C276 (UNS N10276) excels in strongly reducing environments due to its higher molybdenum content (16% vs 13% in C22). Hastelloy C22 outperforms C276 in oxidizing environments due to its higher chromium content (22% vs 15.5%). C276 is the preferred choice for reducing acid service; C22 is selected for oxidizing media with chlorides.

Q: Can Hastelloy C276 be welded without post‑weld heat treatment?

A: Yes. Hastelloy C276 seamless pipe can be welded using TIG, MIG, SMAW, and SAW techniques. The alloy is an improved wrought version that does not require solution heat treatment after welding for most applications. For optimal corrosion resistance, solution annealing at 1040–1150°C followed by rapid quenching is recommended.

Q: What is the maximum operating temperature for Hastelloy C276?

A: Hastelloy C276 alloy offers excellent resistance to oxidizing atmospheres up to 1900°F (1038°C). It maintains mechanical properties from cryogenic temperatures (-300°F/-184°C) up to 750°F (400°C) for continuous service. The alloy is ductile, easy to form, and weldable across a wide temperature range.

Q: What industries commonly use Hastelloy C276?

A: Chemical and petrochemical processing (reactors, heat exchangers, distillation columns), oil and gas (sour gas production, downhole equipment, offshore platforms), flue gas desulfurization and pollution control, pharmaceutical equipment, pulp and paper production, waste water treatment, power generation, and marine engineering. This corrosion resistant nickel alloy is the material of choice where failure is not an option.

Package

MONO Group specializes in the supply of Hastelloy C‑276 and a comprehensive portfolio of superalloys, nickel alloys, and high‑temperature alloys. As a China‑based manufacturer and wholesale distributor, we offer plates, sheets, round bars, seamless tubes, welded pipes, fittings, flanges, and custom‑machined parts – all produced in accordance with ASTM, ASME, DIN, ISO, and GB specifications. We also provide cut‑to‑size, precision machining, and surface finishing services to meet your project requirements. For detailed technical datasheets, stock availability, or a competitive quotation, please contact us at info@monokj.com – our team is ready to assist with fast, expert responses.