Hastelloy C276 is officially designated as UNS N10276 and is governed by multiple international material standards:
ASTM B575: Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy, Nickel-Chromium-Molybdenum-Silicon Alloy, and Nickel-Chromium-Molybdenum-Tungsten Alloy Plate, Sheet, and Strip
ASTM B622: Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy, Nickel-Chromium-Molybdenum-Silicon Alloy, and Nickel-Chromium-Molybdenum-Tungsten Alloy Seamless Pipe and Tube
NACE MR0175 / ISO 15156: Mandatory for sour service applications in oil & gas; C276 is one of the few alloys fully compliant for H₂S environments
ASME BPVC Section II, Part D: Listed under UNS N10276 for pressure vessel design
AWS A5.14: Specifies ERNiCrMo-4 as the matching filler metal for welding
Weldability and Thermal Processing
Welding:
Compatible with GTAW, GMAW, and SMAW using ERNiCrMo-4 filler metal (AWS A5.14)
No post-weld heat treatment required due to ultra-low carbon content
Heat Input: 0.5–1.5 kJ/mm; interpass temperature ≤150°C to avoid sensitization
Heat Treatment:
Solution Annealing: 1050–1100°C for 15–30 min per 25 mm thickness, followed by water quenching
Stress Relief: Not recommended; may promote secondary phase precipitation (μ-phase)
Cold Working: Possible with intermediate annealing; maximum 20% deformation per pass
Welding guidelines conform to ASM Handbook Vol. 6: Welding, Brazing and Soldering
The advantages of our product Hastelloy C276:
Provide EN 10204 3.2 or ASTM E112 material reports, including chemical composition, mechanical properties, grain size, and non-destructive testing (UT/PT) data;
Short delivery time and in-stock for small batches
Standard specifications (such as plates, tubes) delivery time: 6–8 weeks;
Customized parts (such as special-shaped forgings, thin-walled tubes): 10–16 weeks;
Small batches (<50kg) can also be customized.
Welding procedure qualification (PQR) and welding material matching, ensuring no weld corrosion failure during equipment manufacturing.
Our product display
Plate, tube and bar forgings are all available in one package.
Product Advantage Comparison: In a strong acid environment (such as hydrochloric acid, sulfuric acid), C276 outperforms Inconel 625 (with lower molybdenum content) and Monel 400 (insufficient chloride ion stress corrosion resistance), especially in reducing media containing chlorides, where it is indispensable.
Our products in industry application and compliance: It has been confirmed to be widely adopted in high-end fields such as pharmaceuticals (reactor inner linings), seawater desalination (high-pressure reverse osmosis membrane shells), and nuclear energy (post-processing equipment), and complies with international standards such as ASME BPVC Section II and NACE MR0175.
Hastelloy C276 is a nickel-chromium-chromium-tungsten-nickel-based alloy. Compared to other alloys, its core advantages lie in excellent corrosion resistance, good mechanical properties, and machinability, as follows:
High corrosion resistance: Hastelloy C276 exhibits outstanding resistance to oxidizing, reducing, mixed, and high-temperature high-pressure corrosive environments. In 10% boiling hydrochloric acid, the annual corrosion rate of C276 is only 0.13mm, while that of 316L stainless steel is as high as 25mm/year. In an extreme environment with 100,000 ppm of chloride ions, C276 can operate continuously for 8 years without pitting corrosion, while titanium alloys fail after 1 year under such conditions. Its pitting resistance equivalent (PREN) is as high as 55, far exceeding 316L (PREN ≈ 25) and Inconel 625 (PREN ≈ 45).
Excellent local corrosion resistance: Hastelloy C276 demonstrates outstanding resistance to pitting and crevice corrosion in environments containing chlorides and other halides. Its critical pitting temperature (CPT) is as high as 150°C in an acidified 6% FeCl₃ solution, far superior to 316L stainless steel (CPT 15°C) and 254SMO stainless steel (CPT 60°C). At the same time, this alloy has extremely strong resistance to stress corrosion cracking in chloride solutions, and no cracks occur within 1008 hours in a 45% boiling magnesium chloride solution test, while 316L stainless steel cracks within 2 hours.
Good mechanical properties: The tensile strength of Hastelloy C276 at room temperature can reach 690MPa, the yield strength is 283MPa, the elongation is 40%, and the hardness is HB 230. At 650℃, its tensile strength still remains at 450MPa, and the creep deformation within 1000 hours is only 0.15%. The mechanical properties far exceed those of 316L stainless steel and other conventional materials.
Good processing and welding performance: Hastelloy C276 has good toughness and is easy to undergo cold and hot processing, capable of achieving a 35% cold deformation. Its extremely low carbon and silicon content significantly reduces its welding sensitivity, and after welding, it can maintain excellent corrosion resistance without heat treatment, making it highly suitable for GTAW (TIG), GMAW (MIG), and SMAW (welding wire arc welding) processes. Compared to some alloys with strict welding requirements, the processing and welding difficulty is lower.
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