Hastelloy C2000 (often abbreviated as C2000) is a high-performance nickel-chromium-molybdenum-copper (Ni-Cr-Mo-Cu) superalloy developed by Haynes International as part of the Hastelloy family. It is engineered for exceptional corrosion resistance in a wide range of aggressive environments, combining the best properties of earlier C-type alloys (like C276 and C22) with enhanced performance in specific chemicals.
Key characteristics of C2000 include:
Chemical composition: Typically ~59% nickel (Ni), 23–27% chromium (Cr), 15–17% molybdenum (Mo), 1–2% copper (Cu), and ≤3% iron (Fe). The copper addition is critical, as it improves resistance to sulfuric acid and other reducing acids.
Corrosion resistance: Excels in both oxidizing (e.g., nitric acid, hypochlorites) and reducing (e.g., sulfuric acid, phosphoric acid) environments, making it highly versatile for mixed-acid systems. It also resists pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride-rich solutions (e.g., seawater, brines).
Mechanical properties: Good tensile strength (~700 MPa ultimate) and ductility, with stable performance across a broad temperature range (from cryogenic to ~870°C/1,600°F). It is weldable and formable with proper techniques.
C2000 is particularly valued in industries where exposure to complex chemical mixtures (e.g., chemical processing, pharmaceuticals) demands a balance of oxidation and reduction resistance.
Hastelloy C2000 has several international equivalents, defined by standardized material classification systems:
UNS (Unified Numbering System): UNS N06200 (the primary designation for C2000 in North America).
DIN/EN (German/European): W.Nr. 2.4675 (a numerical designation used in European standards).
ISO (International Organization for Standardization): ISO 15156-3 (classifies C2000 under the nickel-based alloy category for oil and gas applications).
Chinese Standards: NS3405 (the equivalent grade in China's national material standard system).
These equivalents ensure cross-industry and global consistency, confirming that the material meets the same chemical and performance criteria as Hastelloy C2000, even under different regional designations.
Hastelloy C2000 is covered by multiple ASTM International standards, each specifying requirements for different product forms (e.g., pipes, sheets, bars). The key standards include:
ASTM B575: Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625, N06022, N06059, N06985, N07041, N07081, N07718, and N06200) Plate, Sheet, and Strip
Applies to C2000 in plate, sheet, and strip forms, outlining chemical composition, mechanical properties (tensile strength, elongation), and testing requirements.
ASTM B622: Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) and Nickel-Chromium-Molybdenum-Tungsten Alloy (UNS N06022, N06200) Seamless Pipe and Tube
Governs seamless pipes and tubes made from C2000, including dimensional tolerances, pressure testing, and non-destructive examination.
ASTM B619: Standard Specification for Welded Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) and Nickel-Chromium-Molybdenum-Tungsten Alloy (UNS N06022, N06200) Pipe and Tube
Covers welded pipes and tubes of C2000, specifying welding procedures, joint strength, and corrosion resistance validation.
ASTM B564: Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) and Nickel-Chromium-Molybdenum-Tungsten Alloy (UNS N06022, N06200) Forgings
Applies to forged C2000 products (e.g., flanges, valves), detailing forging processes, heat treatment, and mechanical testing.
ASTM B366: Standard Specification for Nickel and Nickel Alloy Forged Fittings
Includes C2000 fittings (e.g., elbows, tees), ensuring they meet dimensional and performance standards for high-pressure systems.
These standards ensure that C2000 products, regardless of form, adhere to strict quality and performance criteria for safe and reliable use in critical applications.
