COMPREHENSIVE TECHNICAL ANALYSIS AND DATASHEET OF HASTELLOY C-2000 (UNS N06200) FASTENING SYSTEMS
Hastelloy C-2000 (officially designated as UNS N06200) represents a metallurgical breakthrough in the highly esteemed "C-type" nickel-chromium-molybdenum alloy family. By intentionally adding Copper (1.6%) to the standard high-chromium and high-molybdenum matrix, C-2000 bridges the gap between alloys that are highly resistant to oxidizing media (like C-22) and those exceptionally resistant to reducing media (like B-2 or B-3).
This deliberate alloying strategy results in the most versatile corrosion-resistant alloy on the market. It exhibits outstanding resistance to sulfuric acid, hydrochloric acid, and hydrofluoric acid, while its 23% chromium content provides near-immunity to oxidizing chemicals containing ferric ions, cupric ions, and dissolved oxygen. It is the premier fastening solution for multi-purpose chemical processing equipment where process streams frequently change between oxidizing and reducing conditions.
■ Product Overview & Specifications
Hastelloy C-2000 fasteners are supplied in the solution-annealed condition to ensure a pure, homogeneous austenitic microstructure, preventing the precipitation of detrimental carbides at the grain boundaries.
| Material Classification | Nickel-Chromium-Molybdenum-Copper Superalloy |
|---|---|
| UNS Designation | N06200 |
| Microstructure | Face-Centered Cubic (FCC) Austenitic |
| Magnetic State | Non-Magnetic |
| Density | ~8.50 g/cm³ (0.307 lb/in³) |
| Melting Range | 2458°F – 2548°F (1348°C – 1398°C) |
| Size Range | Metric: M6 to M100 | Imperial: 1/4" to 4" Custom U-bolts, heavy hex nuts, and threaded rods available. |
| Thread Types | UNC, UNF, 8UN, Metric Coarse, Metric Fine (Rolled threads strictly recommended) |
■ Proprietary Datasheet Download (GATED)
Access professional-grade technical data for Hastelloy C-2000, including iso-corrosion charts for sulfuric acid across all concentrations, comparative pitting data (PREN), and mixed-acid performance metrics.
Hastelloy C-2000 (N06200) — Complete Technical Datasheet
Contains specific corrosion mass-loss rates for ASTM G-28 tests, elevated temperature tensile curves, and critical crevice temperature (CCT) thresholds.
⬇ DOWNLOAD/VIEW FULL DATASHEET■ MTC Integration Section
To ensure structural integrity and absolute chemical compatibility in lethal service environments, Ananka Group provides strict metallurgical verification for all C-2000 fastening packages.
- EN 10204 Type 3.1: Detailed reporting of actual ladle chemical analysis, explicitly verifying the Chromium, Molybdenum, and critical Copper additions, alongside mechanical property certification.
- EN 10204 Type 3.2: Third-party witness testing facilitated for critical pharmaceutical processing plants and highly toxic petrochemical reactor fastening.
■ Chemical Composition (UNS N06200)
C-2000 utilizes the highly successful foundation of C-276 and C-22 but introduces Copper to significantly expand its resistance to reducing acids like sulfuric and hydrofluoric, without sacrificing chloride resistance.
| Nickel (Ni) | Chromium (Cr) | Moly (Mo) | Copper (Cu) | Iron (Fe) | Manganese (Mn) | Carbon (C) |
|---|---|---|---|---|---|---|
| Balance (~59.0%) | 22.0 – 24.0 | 15.0 – 17.0 | 1.30 – 1.90 | 3.00 Max | 0.50 Max | 0.01 Max |
*Silicon (0.08 Max) and Carbon are kept extremely low to prevent weld-decay and intergranular attack. Aluminum (0.50 Max) is also tightly controlled.
■ Mechanical Properties
In the solution-annealed condition, C-2000 offers excellent ductility and toughness combined with mechanical strength that significantly outperforms standard austenitic stainless steels.
| Property | Solution Annealed Condition (Typical Minimums) |
|---|---|
| Tensile Strength (Min) | 100 ksi (690 MPa) |
| Yield Strength (0.2% Offset, Min) | 45 ksi (310 MPa) |
| Elongation in 2" (Min) | 45% |
| Hardness (Typical) | ~90 HRB |
■ Equivalent Grades & Designations
| Standard / System | Designation |
|---|---|
| UNS Designation | N06200 |
| Common Trade Name | Hastelloy C-2000® (Trademark of Haynes International) |
| ASTM Fastener Specs | ASTM B574 (Bar), ASTM B575 (Plate/Sheet) |
| European Equivalent | W.Nr. 2.4675 / NiCr23Mo16Cu |
■ Corrosion Resistance Profile
Hastelloy C-2000 is often selected when the exact nature of the corrosive fluid is unpredictable, fluctuating, or mixed:
- Broad-Spectrum Acid Resistance: Exceptional performance across all concentrations of sulfuric acid, as well as excellent resistance to hydrochloric and hydrofluoric acids.
- Oxidizing Media: High Chromium (23%) provides immunity to oxidizing contaminants (ferric/cupric ions, dissolved oxygen) that would rapidly degrade other Ni-Mo alloys like B-2 or B-3.
- Chloride Pitting & SCC: A Pitting Resistance Equivalent Number (PREN) exceeding 70, combined with a high Nickel base, makes it virtually immune to chloride-induced stress corrosion cracking and pitting.
■ Applications & Industries
C-2000 is specified in industries where equipment downtime is unacceptably costly or dangerous:
- Multi-Purpose Chemical Processing: Reactors, columns, and heat exchanger bolting in batch processing plants where chemicals alternate daily between oxidizing and reducing media.
- Pharmaceuticals: Clean-room reactor fastening where severe halogenated solvents and acid catalysts are employed.
- Pollution Control (FGD): Scrubber ductwork, dampers, and fasteners exposed to highly acidic, chloride-rich flue gases.
- Metal Processing: Fastening systems for acid pickling lines and waste acid recovery systems.
■ Compatible Fastener Assemblies
To avoid galvanic corrosion in highly conductive, multi-acid electrolytes, Hastelloy C-2000 components must strictly be mated with identical C-2000 hardware.
| External Threads (Hastelloy C-2000) | Recommended Mating Component (Nuts) |
|---|---|
| Hastelloy C-2000 Stud Bolts | Hastelloy C-2000 Heavy Hex Nuts |
| Hastelloy C-2000 Hex Bolts | Hastelloy C-2000 Standard / Heavy Hex Nuts |
■ Torque & Installation Guidelines
Due to its high nickel-chromium matrix, C-2000 is extremely susceptible to thread galling (cold-welding). The application of premium, chemically compatible anti-seize paste is strictly mandatory.
| Nominal Diameter | Threads Per Inch (UNC) | Target Torque — Lubricated (ft-lbs) |
|---|---|---|
| 1/2" | 13 | 45 - 55 |
| 5/8" | 11 | 90 - 110 |
| 3/4" | 10 | 150 - 180 |
| 1" | 8 | 360 - 410 |
■ Why Choose Ananka Group?
Ananka Group guarantees the flawless execution of advanced superalloy machining, providing the chemical industry with infallible fastening packages.
- Advanced Machining Protocols: Alloy C-2000 work-hardens rapidly. We utilize specialized low-speed, high-feed CNC machining to ensure pristine thread profiles without inducing residual surface stresses.
- Rolled Threads: External and internal threads are rolled whenever possible, significantly increasing cyclic fatigue life and minimizing the risk of galling during installation.
- 100% Traceability: Every C-2000 fastener is stamped with a unique heat number, mapping directly back to original, premium mill certificates.
- Custom Hardware Fabrication: Manufacturing of complex flange bolting, precision U-bolts, and custom instrumentation hardware tailored for chemical reactors.
■ Frequently Asked Questions
1. How does C-2000 differ from C-276 and C-22?
While C-276 is the legacy standard and C-22 is highly optimized for oxidizing acids, C-2000 adds 1.6% Copper. This Copper addition massively increases its resistance to reducing acids (like sulfuric and hydrofluoric) while its 23% Chromium maintains excellent resistance to oxidizing acids. It is considered the most "all-around" versatile alloy of the C-family.
2. Does Hastelloy C-2000 suffer from intergranular corrosion after welding?
No. C-2000 is intentionally formulated with ultra-low carbon (0.01% Max) and silicon. This prevents the formation of grain boundary carbide precipitates in the weld heat-affected zone (HAZ), meaning fasteners and fabricated components maintain their full corrosion resistance in the as-welded condition.
3. Is C-2000 magnetic?
No. Due to its face-centered cubic austenitic structure, C-2000 remains completely non-magnetic regardless of ambient or operating temperatures.
4. What are the temperature limits for Alloy C-2000?
While it resists oxidation effectively, C-2000 is primarily used for aqueous (liquid) corrosion resistance up to approximately 800°F (427°C). For continuous high-temperature structural use, alloys designed specifically for creep resistance (like Nimonic or Inconel 718) are generally specified.