Zhengzhou Huitong Pipeline Equipment Co.,Ltd.
Zhengzhou Huitong Pipeline Equipment Co., Ltd.
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ASME B16.5 1/2"-24" ASTM A182 F44 254SMO 1.4547 WN SO flange
1. 254SMO material brief introduction
254 SMO is an austenitic stainless steel designed for superior pitting and crevice corrosion. 254 SMO is ideal for high-chloride environments because of its high levels of chromium, molybdenum, and nitrogen. 254 SMO is often used where 316L or 317L has failed. 254 SMO is significantly stronger than the common austenitic grades, and it is also characterized by high ductility and impact strength.
| Standard | UNS | Werkstoff Nr. | EN | SS | AFNOR |
| 254 SMO | S31254 | 1.4541 | X1CrNiMoCuN20-18-7 | 2378* | Z1 CNDU 20.18.06AZ* |
Chemical Composition, %
| Carbon | Chromium | Nickel | Molybdenum | Nitrogen | |
| 0.020 max | 19.5 -20.5 | 17.5 – 18.5 | 6.0 – 6.5 | 0.18 – 0.22 | |
| Copper | Sulfur | Phosphorus | Silicon | Manganese | Iron |
| 0.50 – 1.00 | 0.010 max | 0.030 max | 0.80 max | 1.00 max | Balance |
Mechanical Properties
Typical mechanical properties for grade 254 SMO Bolts
| 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 |
2. 254SMO flange processing chart
3. Flange surface roughness
4. 254SMO flange package