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Apr 25 2024Nitronic 60 (UNS S21800, Alloy 218) is a highly effective austenitic stainless steel known for its exceptional resistance to galling and wear. It surpasses 304 stainless steel in terms of uniform corrosion resistance in a majority of environments and exhibits superior chloride pitting resistance compared to 316 stainless steel. Moreover, Nitronic 60 boasts a room temperature yield strength nearly twice as high as that of both 304 and 316 stainless steel variants. Furthermore, this material showcases excellent resistance to oxidation at elevated temperatures and remarkable impact resistance even in low-temperature conditions.
Infrastructure: Bridge pin and hanger expansion joints, parking deck expansion joint wear plates
Hydroelectric Power: Stems, wicket gate wear rings
Oil and Gas: pump wear rings, bushings, valve trim, seals, fittings, logging equipment and screens
Food processing and Pharmaceuticals: Galling resistant applications in sanitary equipment where lubricants cannot be used
Chemical and Petrochemical: Process valve stems, seats and trim, pump wear rings
|
Material |
Cr |
P |
S |
Ni |
Si |
C |
Mn |
N |
|
Nitronic 60 |
16.0-18.0 |
0.04 max |
0.01 max |
8.00-9.00 |
3.50-4.50 |
0.01 max |
7.00-9.00 |
0.08-0.18
|
|
Material |
Tensile strength |
Yield strength 0,2 |
Elongation |
Hardness HB30 |
|
Nitronic 60 |
690N/mm² |
379N/mm² |
35% |
293HB |
The corrosion resistance of Nitronic 60 material lies within the range of grades 304 and 316. While its overall corrosion resistance may not match that of type 316 stainless steel, Nitronic 60 stainless steel does provide improved resistance to chloride pitting, stress corrosion cracking, and crevice corrosion compared to type 316. It is worth noting that in a wear system, the primary concerns in design are galling or seizure, followed by dimensional loss due to wear, and finally, corrosion. Therefore, the prevention of galling and wear takes precedence in the design considerations.
Nitronic 60 demonstrates superior galling resistance and wear resistance compared to other austenitic stainless steels, as well as PH and duplex stainless steels. It also exhibits comparable performance to cobalt or high nickel wear alloys under various test conditions. Moreover, Nitronic 60 material is well-suited for elevated temperature applications, ranging from 800˚F to 1500˚F (427˚C to 816˚C), making it suitable for automotive valve trim, stems, and bushings.
The hardenability of Nitronic 60 Stainless Steel cannot be achieved through heat treatment. Instead, it is recommended to anneal the material at 1066 °C (1950 °F) and then swiftly quench it in water.
For heating and pickling Nitronic 60, it is generally advisable to adhere to the standard guidelines followed for stainless steel.
Heating: Prior to welding, Nitronic 60 should be preheated within the temperature range of 200 - 400°C (392 - 752°F) to minimize the risk of thermal cracking.
Pickling: Nitronic 60 can undergo a pickling process using a solution composed of nitric acid and hydrofluoric acid. The material is immersed in this pickling solution for a specified duration to eliminate oxide scales, heat-tint, and other surface contaminants that may form during heating or welding procedures.
Nitronic 60 is recognized for its exceptional characteristics in both hot and cold forming processes, enabling it to be shaped using various methods.
Hot Forming: When hot forming alloy 218, it is recommended to heat the material gradually and uniformly within the temperature range of 1170 to 1200°C (2147 to 2192°F) to minimize the potential for thermal stresses and distortion. The material can then be shaped through processes such as forging, hot rolling, and hot extrusion. In most applications, Nitronic 60 stainless steel does not require post-forming heat treatment. However, in certain situations where stress relief is necessary, a solution annealing treatment can be applied after hot forming.
Cold Forming: Nitronic 60 also exhibits ease of cold forming through bending, drawing, and deep drawing techniques. It possesses high ductility, allowing for significant deformation without significant loss of material properties. However, excessive cold working, particularly in heavily cold-reduced sections, can result in increased hardness and reduced ductility.
Machining Nitronic 60 can pose challenges due to its favorable metallurgical properties, which provide excellent wear and galling resistance. Compared to 304 stainless steel, Nitronic 60's machinability is rated at 50%, while it is rated at 23% compared to free-cutting carbon steel AISI B1112. To effectively machine Nitronic 60, it is recommended to use sharp, rigid, carbide-tipped tools and well-powered machines. Additionally, employing heavy cuts and slow speeds is advisable to achieve optimal results.
Nitronic 60 can be easily welded using conventional joining techniques, and neither preheating nor post-weld heat treatments are typically required, except for the standard stress relief utilized in heavy fabrication. In most applications, the material is used in its welded condition unless corrosion resistance is a crucial factor. Autogenous gas tungsten arc welding (GTAW) produces sound welds with wear characteristics similar to the base metal. Heavy weld deposits created through this process exhibit higher strength than the unwelded base metal. When a filler material is necessary, Nitronic 60 filler material is recommended, and annealing may be necessary to achieve a high-strength weld and obtain optimal corrosion resistance.
Ø Bar & Rod
Ø Plate & Sheet
Ø Coil & Strip
Ø Pipe & Tube
Ø Fitting: Flange, Tee, Elbow, Reducer etc.
Ø Forging: Ring, Shaft, Circle, Block etc.
Ronsco is a supplier with more than 27 years of experience in the special metal field, we always adheres to the business phiosophy of "customer-centered", tries its best to meet the requirements of customers and pursues win-win cooperation with customers. Are you looking for special metal products one-stop supplier! Contact Us Now! Email: marketing@ronsteel.com
