Nitronic 60 Round Bar (UNS S21800)
Nitronic 60 is an austenitic stainless steel alloyed with silicon, manganese and nitrogen that was developed specifically to resist galling, seizing and metal-to-metal wear. It provides wear resistance in stainless-to-stainless contact that is far superior to 304 and 316, while keeping corrosion resistance between 304 and 316, together with a yield strength about twice that of 304.
Nexforge Alloys supplies Nitronic 60 round bars in the annealed condition to ASTM A276 / A479 and AMS 5848, in peeled, ground or bright finish. Bars are heat traceable and certified for chemistry, tensile properties and hardness, and are widely used for valve stems, pins, bushings and fastener applications where galling is a problem.
Nitronic 60 (UNS S21800, Alloy 218) round bars from 6 mm to 200 mm diameter, annealed as per ASTM A276 / A479 / AMS 5848, for anti-galling and wear applications.
Nitronic 60 Round Bar Specification
| Parameter | Details |
|---|---|
| Alloy Designations | Nitronic 60, Alloy 218, UNS S21800 |
| Standards | ASTM A276, ASTM A479, ASME SA479, AMS 5848, ASTM A193 Grade B8S (fasteners) |
| Size Range | 6 mm to 200 mm diameter |
| Length | Random 3 to 6 metres, or cut to length |
| Condition | Annealed; high strength (hot rolled, Condition HS) on request |
| Surface Finish | Peeled, centreless ground, bright, rough turned |
| Tolerance | h9 / h10 / h11 or as per drawing |
| Testing | Chemical, tensile, hardness, UT on request |
| Certification | EN 10204 3.1 mill test certificate |
Chemical Composition (% by weight)
| Element | C | Mn | Si | P | S | Cr | Ni | N | Fe |
|---|---|---|---|---|---|---|---|---|---|
| Nitronic 60 (S21800) | 0.10 max | 7.00 - 9.00 | 3.50 - 4.50 | 0.040 max | 0.030 max | 16.0 - 18.0 | 8.00 - 9.00 | 0.08 - 0.18 | Balance |
Mechanical Properties
| Condition | Tensile Strength (min) | 0.2% Yield Strength (min) | Elongation (min) | Reduction of Area (min) | Hardness (max) | Density |
|---|---|---|---|---|---|---|
| Annealed | 655 MPa (95 ksi) | 345 MPa (50 ksi) | 35 % | 55 % | 241 HB | 7.62 g/cm³ |
Values are minimum or typical figures as per the referenced standards and are for guidance only. Please refer to the mill test certificate supplied with the material for actual values.
Key Features
- Outstanding resistance to galling and seizing without coatings or lubricants
- Excellent cavitation erosion and metal-to-metal wear resistance
- Corrosion resistance between 304 and 316, better chloride pitting resistance than 304
- Non-magnetic, retains toughness down to cryogenic temperatures
- Yield strength roughly double that of 304 stainless steel
Applications
- Valve stems, seats and trim in oil and gas and chemical plants
- Pump wear rings, shafts and bushings
- Fastener systems, pins and bolts where galling occurs
- Food processing and pharmaceutical machinery parts
- Chain links, roller and bridge bearing components