| Type: | Stainless Steel Sheets |
|---|---|
| Standard: | ASTM |
| Grade: | S31254 254smo |
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Alloy 254 SMO is a very high end, molybdenum and nitrogen alloyed super austenitic stainless steel with low carbon content. It demonstrates outstanding resistance to pitting, crevice corrosion stress cracking, and corrosion fatigue uniform corrosion. Alloy 254 SMO is substantially stronger than the common austenitic grades, with strength nearly twice that of 300 series stainless steel. It is also characterized by high ductility and impact strength. With high levels of chromium, molybdenum, and nitrogen, Alloy 254 SMO is frequently used in high chloride environments, such as brackish water, seawater, pulp mill bleach plants, and other chloride process streams. In some applications it has even been found to be a more cost effective substitute for high nickel and titanium alloys.
Due to its high levels of molybdenum and nickel, Alloy 254 SMO is frequently used in high chloride environments. Examples of applications that call for the used of Alloy 254 SMO include:
254SMo is an austenitic stainless steel, developed for use in halide-containing environments such as seawater. The superiority of this steel manifests itself especially in halide-containing acids. 254SMo also features good resistance to uniform corrosion. As its carbon content is less than 0.02%, it is called pure austenitic stainless steel; when its carbon content is less than 0.01% , it can also be called super austenitic stainless steel.
Super stainless steel is a type of special stainless steel. First of all, unlike ordinary stainless steel, it is a high-alloy stainless steel containing high nickel, high chromium and high molybdenum. The most well-known one is 254SMo with 6% Mo. Due to high molybdenum content, this stainless steel features very good local corrosion resistance. Plus, it features good resistance to pitting corrosion (PI ≥ 40) and stress corrosion when used in harsh conditions like seawater, aeration, gap and low speed scouring. Therefore, it can be a great substitute to nickel-based alloys and titanium alloys. Secondly, it embodies excellent high-temperature resistance and corrosion resistance, which 304 stainless steel cannot match. In addition, from the classification of stainless steel, the metallographic structure of special stainless steel is a stable austenitic metallurgical structure.
According to the results of a large number of field experiments and extensive experience, 254SMo has high crevice corrosion resistance in seawater, even at slightly higher temperatures. Only a few types of stainless steel embody this property. In acidic solutions and oxidizing halide solutions necessary for paper bleaching, 254SMo demonstrates strong corrosion resistance, comparable to that of the most corrosion-resistant nickel-based alloys and titanium alloys.
Due to the high nitrogen content, 254SMo features better mechanical strength than other types of austenitic stainless steel. In addition, 254SMO features high ductility, impact strength and good weldability. The high molybdenum content contained within allows 254SMO to acquire a high oxidation rate during annealing, resulting in a rougher surface than common stainless steel after pickling. However, this does no harm to the corrosion resistance of this stainless steel.
| Standard | UNS | Werkstoff Nr. | EN | SS | AFNOR |
| 254 SMO | S31254 | 1.4529 | X1CrNiMoCuN20-18-7 | 2378* | Z1 CNDU 20.18.06AZ* |
| Element | Content (%) |
| Iron, Fe | 55.69 |
| Chromium, Cr | 20 |
| Nickel, Ni | 18 |
| Molybdenum, Mo | 6.1 |
| Nitrogen, N | 0.20 |
| Carbon, C | 0.010 |
| Properties | Metric | Imperial |
| Tensile strength | 680 MPa | 98600 psi |
| Yield strength | 300 MPa | 43500 psi |
| Modulus of elasticity | 195 GPa | 28300 ksi |
| Shear modulus | 75 GPa | 10900 ksi |
| Poisson's ratio | 0.30 | 0.30 |
| Elongation at break | 50 % | 50 % |
| Hardness, Brinell | 210 | 210 |
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