Exotic Alloys Alloy 218 Flanges Overview
Zeon Exports supplies Exotic Alloy 218 (Nitronic 60, UNS S21800) flanges, a nitrogen and manganese-strengthened austenitic stainless steel with outstanding resistance to galling, wear and fretting for valve and process piping applications.
Exotic Alloy 218 (Nitronic 60) Flanges connect and seal process piping where wear, galling and fretting resistance matter alongside moderate corrosion resistance. Its elevated silicon and manganese content inhibits wear, galling and fretting even in the annealed condition, with strength roughly double that of Type 304 and oxidation resistance similar to Type 309.
- Outstanding galling resistance versus standard austenitic stainless
- Tensile ≥655 MPa, yield ≥345 MPa in the annealed condition
- EN 10204 3.1 certified, export-ready worldwide
Quick Specifications of Exotic Alloys Alloy 218 Flanges
Exotic Alloy 218 (Nitronic 60) Flanges are produced to internationally recognized specifications.
| Field | Detail |
|---|---|
| Material/Grade | Exotic Alloy 218 (Nitronic 60) |
| UNS | S21800 |
| DIN/Werkstoff Number | 1.4565 |
| Standards | ASTM A182 forgings (confirm exact grade with mill) |
| Form | Weld Neck, Slip-On, Blind, Socket Weld |
| Finish | As specified (confirm on order) |
| Heat Treatment | Solution Annealed |
| Certification | EN 10204 3.1 |
Equivalent Grades of Alloy 218
Alloy 218 (Nitronic 60) is recognized under several international designations below.
| UNS | DIN/Werkstoff Number | Common Trade Name |
|---|---|---|
| S21800 | 1.4565 | Nitronic 60 / Alloy 218 |
Chemical Composition of Alloy 218
Composition for UNS S21800; exact limits can vary slightly by specification and heat.
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 9.0 |
| Manganese (Mn) | 7.0 – 9.0 |
| Silicon (Si) | 3.5 – 4.5 |
| Nitrogen (N) | 0.08 – 0.18 |
| Carbon (C), max | 0.10 |
| Iron (Fe) | Balance |
Physical Properties of Exotic Alloy 218 (Nitronic 60)
Physical properties for Nitronic 60, confirmed against manufacturer data.
| Property | Value |
|---|---|
| Density | 7.62 g/cm3 |
| Melting Range | Confirm against applicable datasheet |
| Magnetic Behaviour | Essentially non-magnetic |
Mechanical Properties of Exotic Alloys Alloy 218 Flanges
Minimum mechanical properties for annealed UNS S21800; confirm against the specific forging standard for your order.
| Property | Minimum Value |
|---|---|
| Tensile Strength | 655 MPa (95 ksi) |
| Yield Strength (0.2% offset) | 345 MPa (50 ksi) |
| Elongation | 35% |
| Hardness | 241 HB max |
| Condition | Solution Annealed |
Corrosion Resistance of Exotic Alloy 218 (Nitronic 60)
- Exotic Alloy 218 Flanges are chosen more for wear and galling resistance than for general corrosion resistance.
- General corrosion resistance: performs between Type 304 and Type 316 stainless steel.
- Galling and wear resistance: elevated silicon and manganese give outstanding resistance to seizing in self-mated or dissimilar metal contacts.
- Chloride SCC caution: like other austenitic grades, may be susceptible to stress corrosion cracking in hot chloride environments.
Heat Resistance of Exotic Alloy 218 (Nitronic 60)
Exotic Alloy 218 flanges retain good mechanical properties at elevated temperatures up to roughly 982°C (1,800°F) intermittent exposure, with oxidation resistance similar to Type 309 stainless steel. It is not hardenable by heat treatment; higher strength is achieved only through cold working. Confirm exact service limits against the governing standard and application before specifying.
Key Properties of Exotic Alloys Alloy 218 Flanges
Beyond corrosion and heat performance, Nitronic 60 flanges offer these additional properties.
- Outstanding resistance to galling, wear and fretting
- Good low-temperature impact properties
- High shear strength and excellent cavitation erosion resistance
- Strength can be increased further through cold working
Benefits of Exotic Alloys Alloy 218 Flanges
Choosing Nitronic 60 flanges from Zeon Exports delivers measurable advantages for your project.
- Solves galling and seizing problems standard stainless can't
- Full MTC 3.1 documentation for project QA/QC requirements
- Multiple flange types and pressure classes to match project specs
- Reliable bulk supply with consistent ready stock
- Competitive export pricing for large industrial orders
- Fast dispatch to global project sites and ports
Related Products
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Request a Quote for Exotic Alloys Alloy 218 Flanges
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Frequently Asked Questions About Exotic Alloys Alloy 218 Flanges
Common questions about Exotic Alloy 218 (Nitronic 60) Flanges, answered below.
Q1: What is Exotic Alloy 218?
Ans. Alloy 218 (Nitronic 60, UNS S21800) is a nitrogen and manganese-strengthened austenitic stainless steel resistant to galling.
Q2: What standards do Alloy 218 flanges meet?
Ans. Flanges are manufactured per applicable ASTM forging standards, certified to EN 10204 3.1 mill test certificates.
Q3: Is Alloy 218 magnetic?
Ans. Alloy 218 is essentially non-magnetic, being an austenitic stainless steel.
Q4: How does Alloy 218 compare to 316?
Ans. Alloy 218 has roughly double the yield strength of Type 304 and general corrosion resistance between Type 304 and Type 316.
Q5: Why choose Alloy 218 for flanges?
Ans. Its high strength and galling resistance suit repeated bolt-up cycles and abrasive service better than standard stainless flanges.
Q6: Can Alloy 218 be hardened by heat treatment?
Ans. No, Alloy 218 is not hardenable by heat treatment; higher strength is achieved only through cold working.
Q7: What certification is provided with orders?
Ans. Every order ships with EN 10204 3.1 mill test certificates confirming grade, heat and dimensions.
Q8: Does Zeon Exports supply custom flange sizes?
Ans. Yes, flanges are available in custom sizes and pressure classes on request for bulk industrial orders.
