Exotic Alloys Alloy 218 Fasteners Overview
Zeon Exports supplies Exotic Alloy 218 (Nitronic 60, UNS S21800) fasteners – bolts, nuts and studs – a nitrogen and manganese-strengthened austenitic stainless steel with outstanding resistance to galling, making it a preferred choice for anti-seize bolting.
Exotic Alloy 218 (Nitronic 60) Fasteners secure bolted connections that require frequent assembly and disassembly without seizing or thread damage. 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 Fasteners
Exotic Alloy 218 (Nitronic 60) Fasteners are produced to internationally recognized bolting specifications.
| Field | Detail |
|---|---|
| Material/Grade | Exotic Alloy 218 (Nitronic 60) |
| UNS | S21800 |
| DIN/Werkstoff Number | 1.4565 |
| Standards | ASTM A193 Gr. B8S (Bolts), ASTM A194 Gr. 8S (Nuts) |
| Form | Bolts, Nuts, Studs |
| 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 | ASTM/ASME Standard |
|---|---|---|---|
| S21800 | 1.4565 | Nitronic 60 / Alloy 218 | ASTM A193 Gr. B8S / A194 Gr. 8S |
Chemical Composition of Alloy 218
Composition per ASTM A193/A194 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 Fasteners
Minimum mechanical properties for annealed UNS S21800 per ASTM A193/A194.
| 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 Fasteners 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 fasteners 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 Fasteners
Beyond corrosion and heat performance, Nitronic 60 fasteners 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 Fasteners
Choosing Nitronic 60 fasteners 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 sizes, threads and finishes to match exact 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
Explore related Exotic Alloy products from Zeon Exports.
Request a Quote for Exotic Alloys Alloy 218 Fasteners
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Frequently Asked Questions About Exotic Alloys Alloy 218 Fasteners
Common questions about Exotic Alloy 218 (Nitronic 60) Fasteners, 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 fasteners meet?
Ans. Fasteners are manufactured to ASTM A193 Grade B8S / A194 Grade 8S, 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: Why is Alloy 218 used for anti-seize fasteners?
Ans. Its exceptional galling resistance prevents thread seizure during repeated assembly and disassembly, even without lubrication.
Q5: 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.
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 sizes?
Ans. Yes, fasteners are available in custom thread sizes and lengths on request for bulk industrial orders.
