Nitronic 30, UNS S20400,
Note that the designation “ Nitronic®” is registered trademarks of AK Steel Corporation.
Nitronic 30 is a nitrogen-strengthened austenitic stainless steel developed for applications requiring a good level of aqueous corrosion resistance combined with toughness and economy. It offers significantly higher strength than type 304 and may allow lighter gauges to further reduce costs. Also, Nitronic 30 work hardens rapidly while retaining ductility, and easily welded and formed.
| Material | Cr | P | S | Ni | Si | C | Mn | Cu |
|---|---|---|---|---|---|---|---|---|
| Nitronic 30 | 15.0-17.0 | 0.04 max | 0.03 max | 1.50-3.00 | 1.00 max | 0.03 max | 7.00-9.00 | 1.00 max |
| Material | Tensile strength | Yield strength 0,2 | Elongation | Hardness HB30 |
|---|---|---|---|---|
| Nitronic 30 | 758 N/mm² | 379 N/mm² | 50% | 95HB |
Nitronic 30 exhibits good corrosion resistance to a variety of media. As measured by tests in 10% FeCl3 solution, the material's pitting resistance is better than type 304. In sulfuric acid and hydrochloric acid, Nitronic 30 is much better than types 409 and 410 and approaches type 304 in more dilute solutions. However, caution should be used with reducing acids. Activated Nitronic 30 material may not repassivate when exposed to HCI or H2SO4 and significant corrosion may occur.
Nitronic 30 stainless steel cannot be hardened by using heat treatment.
Heating of Nitronic 30 is commonly performed in heat treatment to relieve residual stresses that may have developed during fabrication or machining processes. The specific heating process and temperature range will depend on the desired stress relief and the specific requirements of the application. The material is typically heated to a temperature range of 500-600°C (932-1112°F) and held at that temperature for a sufficient time to allow stress relaxation. The heating process is followed by controlled cooling to prevent the formation of new stresses.
Pickling is a common process used to remove surface impurities and oxide layers from Nitronic 30 material. It involves immersing the material in a pickling solution, typically an acid-based solution, to dissolve contaminants and restore the material's corrosion resistance. During the pickling process, it is crucial to control the concentration and temperature of the pickling solution to prevent excessive etching or corrosion of the stainless steel surface.
Nitronic 30 is known for its excellent formability, both in hot and cold working conditions. It can be readily formed into various shapes and sizes using common forming techniques.
Hot Forming: In the temperature range of 1175-1200°C (2147-2192°F), the elevated temperatures soften the Nitronic 309, making it more malleable and easier to shape by hot rolling, hot forging, and hot extrusion. The hot forming of Nitronic 30 stainless steel is commonly used for larger and more complex components that require significant deformation or shaping.
Cold Forming: Nitronic 30 also exhibits good cold formability, the material can easy shaping and deformation at room temperature by cold rolling, cold drawing, bending, and stamping. The cold forming of Nitronic 30 material is often used for producing smaller components, intricate shapes, and parts with tight tolerances. It is important to note that Nitronic 30 stainless steel can work-harden during cold forming, so intermediate annealing may be required to restore its ductility and prevent cracking.
Although, Nitronic 30 has machinability characteristics are similar to that of other austenitic stainless steels, but the high work hardening rate of Nitronic 30 stainless steel, making its need heavy machines with carbide coated tooling when machining. Also, the material will have to be held more rigidly and slower speeds used.
Nitronic 30 austenitic stainless steels is generally considered to be weldable by the common fusion and resistance techniques such as high frequency tube and pipe welding. The material have similar weldability to type 304L, a major difference is that Nitronic 30 material requires slower arc welding speed to obtain penetration. When a weld filler is needed, AWS E/ ER 308L, 309L and 209 are most often specified. Its important to assure that formation of ferrite in the weld deposit to avoid weld “hot cracking”.
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