Hastelloy® C-22®
Hastelloy® C-22® hygienic tubing and fittings for severe corrosive media when AL-6XN® will fail.
Solves Serious Corrosion Problems
Central States Industrial (CSI) keeps a complete line of Hastelloy® C-22® (UNS N06022) tubing and fittings in stock, allowing for a quick turnaround. Hastelloy C-22 has excellent resistance to aggressive oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chlorine ions.
Hastelloy C-22 is identified by the Unified Numbering System (UNS) designation of N06022. It is a nickel based alloy with high nickel (56%), chromium (22%), and molyddenum (13%). Werkstoff's number 2.4602, Inconel ® Alloy 22, VDM ® Alloy 22 and ATI 22™ alloy fall under same UNS number.
Why C-22?
C-22 is used in severely corrosive media with high chloride and temperature applications such as buffer solutions, active pharmaceutical ingredients (API), fabric softeners, cleaning supplies, and fish, soy and chili sauce.
C-22 is a great alternative when superaustenitic stainless steels (AL-6XN®, 904L, and 254 SMO®) and duplex stainless steels (2205 and 2507) will not withstand extremely aggressive media. This is because it is a nickel-chromium-molybdenum-tungsten alloy with better overall resistance to uniform and localized corrosion than any other Ni-Cr-Mo alloy, like Hastelloy C-276, C-4, and alloy 625.
This alloy is recognized by the ASME BPE standard, which identifies several specifications in Part MM (Metallic Materials) and by U. S. Food and Drug Administration (FDA).
1. GOOD MANUFACTURING PRACTICE
Choosing the right sanitary equipment and materials to avoid corrosion is a best practice for most processing environments.
2. NO MICROBIAL CONTAMINATION
No crevice and pitting corrosion, no product accretion.
3. PRODUCT AVAILABILITY
CSI Stocks over 65,000 feet of tubing and thousands of fittings.
4. AVOID EQUIPMENT REPLACEMENT
Super Alloys provide a good return on investment by reducing product loss and maintenance time repairing and replacing corroded parts.
Hastelloy Advantages
Every material has a threshold limit, and when superaustenitic and duplex such as AL-6XN, 254SMO, 904L, 2507, and 2205's threshold is reached, nickel-based alloy Hastelloy C-22/Alloy 22 is the best option. Hastelloy C-22 can withstand very aggressive conditions, surpassing the capabilities of AL-6XN and similar alloys.
1. Corrosion Resistance
Hastelloy C-22 has excellent resistance in oxidizing and reducing environments. It consistently shows good results when exposed to strong oxidizers, such as ferric and cupric chlorides, chlorine, organic and inorganic hot contaminated solutions, formic and acetic acids, acetic anhydride, and seawater and brine solutions.
PREN
The Pitting Resistance Equivalent Number (PREN or PRE) is used as a guide for comparing and ranking a material’s corrosion resistance. The PRE Number is calculated from a formula based on chemical composition.
In today’s market, there is a wide range of austenitic, superaustenitic, duplex, superduplex, and nickel-based alloys. Besides corrosion resistance, other factors should be taken into consideration, such as commercial availability, appearance, good mechanical properties, and fabrication characteristics.
| Alloy | UNS | EN Number | Cr | Ni | Mo | N | PRE Number | |
|---|---|---|---|---|---|---|---|---|
| 625 | N06626 | 2.4856 | 20.0-23.0 | 58 | 8.0-10.0 | - | 41 | Nickel |
| C-276 | N10276 | 2.4819 | 14.5-16.5 | 57 | 15.0-17.0 | - | 45 | Nickel |
| C-22® | N06022 | 2.4602 | 20.0-22.5 | 56 | 12.5-14.5 | - | 46 | Nickel |
Maximum, unless range or minimum is indicated.
Values listed are primary elements only and are not complete chemical compositions as listed in specific product type specifications.
GENERAL NOTES: The following are industry-accepted formulas. Other formulas may be used at the owner’s discretion.
(1) For stainless steels: PRE Number = %Cr + 3.3 [%Mo + 0.5(%W)] + 16(%N).
(2) For nickel alloys: PRE Number = %Cr + 1.5 (%Mo + %W + %Nb).
2. Product Availability
| Product Forms |
|---|
| Plate |
| Sheet |
| Strip |
| Billet |
| Round Bar |
| Wire |
| Covered electrodes |
| High Purity and Sanitary Tubing |
| Pipe |
| Components |
|---|
| High Purity and Sanitary Fittings |
| Pipe Fittings |
| Pumps |
| Valves |
| Fasteners |
| Castings |
| Spray Balls |
| Instrumentation |
| Strainers |
| Adapters |
| Specialty Fittings |
| Piping Spools |
Hastelloy C-22 Industries and Applications
Biotech and pharmaceutical processors have a wealth of experience in C-22/Alloy 22 in addition to process plants in the food, beverage, dairy, personal care and home care industries.
Some of the known applications for C-22/Alloy 22 are active pharmaceutical ingredients (API), buffer solutions, water systems, fish sauce, fermentation, fabric softeners, detergent where standard stainless steel is insufficient and AL-6XN alloy is borderline.
SELECT AN INDUSTRY OR APPLICATION TO LEARN MORE
Pharmaceutical & Biotech
- Buffer Solutions
- Chromatography Columns
- API
- Saline Solutions
- Ethanol Distillation
- Oral Rehydration Salts (ORS)
Personal Care
- Shampoo and Conditioner
- Toothpaste
- Deodorant/Antiperspirant
- Body Wash
- Liquid Soap
Home Care
- Fabric Softener
- Detergent
- Cleaning Supplies
Food, Dairy, and Beverage
- Condiments: Ketchup, Salsa, Mayonnaise
- Sauces: Tomato, Soy, Barbecue, Fish, Chili
- Breaker Eggs/Liquid Eggs
- Soup Stock
- Brine Solutions
- Isotonic Drinks
- Cheese
- Vinegar-based Products
CSI Standards
All Hastelloy C-22 tubing and fittings supplied by CSI will meet the following criteria:
Tubing and fittings are in stock in sizes 0.5” to 3”
Surface Finish Designations
The finish designator is indicated in the CSI item number as a suffix. The suffix will define the finishing requirements for that process component.
| BPE Surface Finish Code | CSI Surface Finish Code | Product Contact Surface
(Max Ra)* | Product Contact Surface Finish Treatment
(ID) | Non-Product Contact Surface
(Max Ra) | Non-Product Contact Surface Finish Treatment
(OD) | Dimensions & Tolerances (BPE) or (CSI) |
|---|---|---|---|---|---|---|
| N/A | PU | N/A | Unpolished (Mill) | N/A | Unpolished (Mill) | CSI |
| SF1 | PL | 20 µ-inch (0.51 µm) | Polished or Drawn | 32 µ-inch (0.81 µm) | Mechanical Polish | BPE |
| SF5 | PO | 20 µ-inch (0.51 µm) | Electropolished | 32 µ-inch (0.81 µm) | Mechanical Polish | BPE |
| SF6 | P25 | 25 µ-inch (0.64 µm) | Electropolished | 32 µ-inch (0.81 µm) | Mechanical Polish | BPE |
Welding Hastelloy C-22
Nickel-based alloys generally exhibit sluggish welding and shallow penetration characteristics; so, the possibility of incomplete fusion increases. Care must be used to ensure that sound welds are achieved. If orbital or automatic welding equipment is used, programs should utilize a pulsed current. Pulsed current inputs can help control weld penetration without exclusive heat input. Pulsing also helps control weld pool, improving the uniformity of weld bead appearance.
Cleanliness is critical when welding nickel-based alloys. Contamination by grease, oil, lead, sulfur, or other low melting point elements can lead to severe cracking problems. The welding surface and adjacent areas should be cleaned thoroughly with an appropriate solvent such as 99.9% isopropanol (IPA). Prior to any welding, all foreign matter—lubricates, cutting chips, burrs, crayon markings— should be removed.
We've outline a complete guide to C-22 welding recommendations in the resource below.
Literature
Literature
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