254 SMO · DIN EN 10028-7
254 SMO is presented here as X1CrNiMoCuN20-18-7 (1.4547) under DIN EN 10028-7. Stainless steel flat products for pressure purposes.
X1CrNiMoCuN20-18-7
Designation: 1.4547
Data edition: DIN EN 10028-7:2008-02
254 SMO 1.4547
254 SMO is presented here as X1CrNiMoCuN20-18-7 (1.4547) under DIN EN 10028-7. Stainless steel flat products for pressure purposes.
Historical edition, superseded; numerical tables reproduce EN 10028-7:2007, not the later 2016 edition. Data edition: EN 10028-7:2007, Tables 3, 4, 9 and 10. Austenitic values shown are transverse; narrow strip tested longitudinally uses Rp0.2 minus 15 MPa, A80 minus 5 points and A minus 2 points. Stretcher-levelled 1.4301 has elongation minima 5 points lower. Duplex longitudinal values are shown separately for strip widths below 300 mm. Commercial 800H/800HT names identify the material family; these tables give the EN designation requirements.
Related grades
14 material references with DIN EN 10028-7 data.
254 SMO properties
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| Element | Mass % |
|---|---|
| C | ≤0.020 |
| Si | ≤0.70 |
| Mn | ≤1.00 |
| P | ≤0.030 |
| S | ≤0.010 |
| Cr | 19.5–20.5 |
| Ni | 17.5–18.5 |
| Mo | 6.0–7.0 |
| N | 0.18–0.25 |
| Other elements | Cu: 0.50–1.00 |
Composition is cast analysis in mass %. Values marked ≤ are maxima; paired values are ranges. Ti and Nb expressions use the carbon content by mass. The symbol — means that this table has no limit for that entry.
| Form | Thickness (mm) | Condition | Test direction | Rp0.2 (MPa) | Rp1.0 min (MPa) | Rm (MPa) | A80 min (%) | A min (%) | Other requirements |
|---|---|---|---|---|---|---|---|---|---|
| Cold-rolled strip | ≤8 | +AT | Transverse | 320 | 350 | 650–850 | 35 | 35 | — |
| Hot-rolled strip | ≤13.5 | +AT | Transverse | 300 | 340 | 650–850 | 35 | 35 | — |
| Hot-rolled plate | ≤75 | +AT | Transverse | 300 | 340 | 650–850 | 40 | 40 | — |
Room-temperature properties. Rp0.2 and Rp1.0 are minimum proof strengths; Rm is tensile strength. A80 applies below 3 mm thickness; A applies from 3 mm using a proportional gauge length of 5.65√S₀. +AT = solution annealed; +A = annealed; +RA = recrystallization annealed; +P = precipitation hardened. Strength is in MPa (N/mm²).