Hastelloy C22 Product Introduction
Product Overview
Hastelloy C22 is a nickel-chromium-molybdenum-tungsten nickel-based corrosion-resistant alloy developed by Haynes International (USA). With its unique multi-element synergistic composition design (high chromium and molybdenum provide resistance to oxidative corrosion, while tungsten enhances localized corrosion resistance), it stands out among numerous nickel-based alloys. It not only offers comprehensive corrosion resistance, capable of withstanding highly corrosive media such as hydrochloric acid, sulfuric acid, and chloride-containing solutions, but also exhibits excellent high-temperature mechanical stability. It can withstand cyclic temperature fluctuations and load impacts for long periods at temperatures below 650°C. Widely used in the manufacturing of critical components requiring high corrosion resistance and reliability in industries such as chemical engineering, energy, and environmental protection, it is the preferred material to replace traditional stainless steel and ordinary alloys in harsh corrosive environments.
International Grade Comparison
Standard System | Grade | Description |
ASTM (USA) | N06022 | UNS Unified Numbering System Grade |
EN (EU) | NiCr22Mo9W | EN 10088-1 Standard Grade |
JIS (Japan) | NW06022 | JIS G4902 Standard Grade |
DIN (Germany) | 2.4602 | DIN 17750 Standard Grade |
ISO (International) | NiCr22Mo9W | ISO 6363 Standard Grade |
Physical Properties (Room Temperature, Key Brief Indicators)
Property Indicator | Typical Value | Unit |
Tensile Strength | ≥690 | MPa |
Yield Strength (0.2% Offset) | ≥275 | MPa |
Elongation (50mm Gauge Length) | ≥40 | % |
Density | 8.9 | g/cm³ |
Melting Point | 1350-1400 | ℃ |
Chemical Composition (Mass Fraction, Key Elements)
Chemical Symbol | Composition Range (%) | Chemical Symbol | Composition Range (%) |
Ni | Balance | W | 2.5-3.5 |
Cr | 20.0-22.5 | Co | ≤2.5 |
Mo | 12.5-14.5 | C | ≤0.015 |
Fe | 2.0-6.0 | Si | ≤0.08 |
|
| Mn | ≤0.5 |
|
| P/S | ≤0.02/≤0.01 |
Product Characteristics
Excellent Corrosion Resistance: It has strong resistance to mixed acids (such as hydrochloric acid, sulfuric acid, nitric acid) and chlorine-containing media (e.g., seawater, chlorine gas), outperforming most nickel-based alloys;
Good High-Temperature Stability: Maintains stable mechanical properties below 650°C and can withstand cyclic high-temperature working conditions;
Superior Processability: Suitable for conventional processing such as welding, forging, and rolling; no complex heat treatment is required after welding to maintain corrosion resistance;
Intergranular Corrosion Resistance: The low-carbon + high-chromium-molybdenum composition design effectively inhibits the risk of intergranular corrosion cracking.
Metallographic Structure
At room temperature, it has a face-centered cubic crystal structure (austenitic structure) with no precipitated phase transformation. It maintains high structural stability after long-term use, with no brittle phases formed.
Product Forms and Executive Standards
Product Form | Main International Executive Standards | Application Reference |
Plates/Strips | ASTM B575, EN 10088-2 | Vessel shells, equipment covers |
Seamless Pipes/Tubes | ASTM B622, EN 10216-5 | Transport pipelines, heat exchanger tubes |
Bars/Forgings | ASTM B574, EN 10269 | Flanges, valve cores, shaft parts |
Wires | ASTM B755, EN 10250-3 | Welding filler wires, precision springs |
