Exotic Alloys Alloy 218 Round Bar Overview
Zeon Exports supplies Exotic Alloy 218 (Nitronic 60, UNS S21800) round bars, a nitrogen and manganese-strengthened austenitic stainless steel with outstanding resistance to galling, wear and fretting for valve stems, pump shafts and anti-seize fasteners.
Exotic Alloy 218 (Nitronic 60) Round Bar is machined into valve stems and trim, pump shafts, pins, bushings and anti-seize fasteners across oil field, petrochemical and food & drug equipment. 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 Round Bar
Exotic Alloy 218 (Nitronic 60) Round Bar is produced to internationally recognized bar specifications.
| Field | Detail |
|---|---|
| Material/Grade | Exotic Alloy 218 (Nitronic 60) |
| UNS | S21800 |
| DIN/Werkstoff Number | 1.4565 |
| Standards | ASTM A276, ASTM A479, AMS 5848 |
| Form | Round Bar |
| Finish | Hot rolled, turned, ground (as specified) |
| 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 A276 / A479 |
Chemical Composition of Alloy 218
Composition per ASTM A276/A479 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 Round Bar
Minimum mechanical properties for annealed UNS S21800 per ASTM A276/A479.
| 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 Round Bar is 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 round bar retains 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 Round Bar
Beyond corrosion and heat performance, Nitronic 60 round bar offers 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 Round Bar
Choosing Nitronic 60 round bar 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 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
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Request a Quote for Exotic Alloys Alloy 218 Round Bar
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Frequently Asked Questions About Exotic Alloys Alloy 218 Round Bar
Common questions about Exotic Alloy 218 (Nitronic 60) Round Bar, 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 apply to Alloy 218 round bar?
Ans. Round bar is manufactured to ASTM A276/A479, 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 valve stems?
Ans. Its exceptional galling and wear resistance prevents seizing in sliding or threaded contacts, ideal for valve stems and trim.
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, round bars are available cut-to-size and in custom dimensions on request for bulk industrial orders.
