AFNOR 254SMO, X1CrNiMoCuN20-18-7, 1.4547, UNS S31254
Stainless steel used in cryogenic, paper, chemical, petrochemical and refining industries, in power plants for heat exchangers, radiators, in aviation construction as aviation steel, screws, valves, heat exchangers, coolers, special tanks, pumps and pipel
Chemical composition(mass fraction)(wt.%)
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.020 | |||
| Si | 0.70 | |||
| Mn | 1.00 | |||
| P | 0.030 | |||
| S | 0.010 | |||
| Cr | 19.50 | 20.50 | ||
| Mo | 6.00 | 7.00 | ||
| Ni | 17.50 | 18.50 | ||
| N | 0.18 | 0.25 | ||
| Cu | 0.50 | 1.00 |
