Hastelloy C-22
Hastelloy C-22 is a nickel-chromium-molybdenum-tungsten alloy designed for broad corrosion resistance in oxidizing and reducing environments. It is especially resistant to pitting, crevice corrosion and stress-corrosion cracking.
Hastelloy C-22 Information
Hastelloy C-22 is a nickel-chromium-molybdenum-tungsten alloy designed for broad corrosion resistance in oxidizing and reducing environments. It is especially resistant to pitting, crevice corrosion and stress-corrosion cracking.
Metallic winding and compatible ring components where service conditions are suitable.
| UNS Number | N06022 |
|---|---|
| Common Product Specification | ASTM B575 |
| Material Type | Ni-Cr-Mo-W corrosion-resistant alloy |
| Common / Applicable Specification | ASTM B575 (plate/sheet/strip) |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
Hastelloy C-22 Chemical Composition
Reference composition limits are shown below. Exact requirements should be confirmed against the applicable product specification and certified material documentation.
| Element / Constituent | Symbol | Composition / Information |
|---|---|---|
| Carbon | C | 0.015 max. |
| Chromium | Cr | 20.0–22.5 |
| Molybdenum | Mo | 12.5–14.5 |
| Tungsten | W | 2.5–3.5 |
| Iron | Fe | 2.0–6.0 |
| Cobalt | Co | 2.5 max. |
| Manganese | Mn | 0.50 max. |
| Silicon | Si | 0.08 max. |
| Vanadium | V | 0.35 max. |
| Nickel | Ni | Balance |
Hastelloy C-22 Mechanical Properties
Reference room-temperature properties are shown for a commonly supplied condition. Exact requirements depend on product form, size, heat treatment and governing specification.
| Property | Reference Value | Unit / Basis |
|---|---|---|
| Tensile Strength | 690 min. | MPa |
| 0.2% Offset Yield Strength | 310 min. | MPa |
| Elongation | 45 min. | % |
Values shown are engineering reference data, not universal design allowables. Final procurement and design must use the governing specification, exact product form/condition and certified material test documentation.
Hastelloy C-22 Physical & Service Information
Reference physical properties and service considerations relevant to material selection for Spiral Wound Gaskets.
| Density | Approx. 8.7 g/cm³ |
|---|---|
| Structure | Nickel-base solid-solution alloy |
| Corrosion Behaviour | Excellent resistance across a wide range of oxidizing and reducing chemical environments. |
| Heat Treatment | Normally solution annealed. |
| Service Selection | Verify compatibility for the exact acid, concentration, contaminants and temperature. |
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