In addition to the descriptive steel grade naming system indicated above, within EN 10027-2 is defined a system for creating unique steel grade numbers. While less descriptive and intuitive than the grand names they are easier to tabulate and use in data processing applications.
Where x is the material type (only 1 is specified so far), yy is the steel group number (specified in EN10027-2) and zz(zz) is a sequential number designated by the certifying body, the number in brackets being unused but reserved for later use.
According to EN 10027-1
| Application | Mechanical
property |
additional symbol | Standard |
|---|---|---|---|
| S | 235 | JR | EN 10025-2 |
| 355 | JR | EN 10025-2 | |
| J0 | EN 10025-2 | ||
| J2 | EN 10025-2 | ||
| K2 | EN 10025-2 | ||
| N | EN 10025-3 | ||
| NL | EN 10025-3 | ||
| 450 | J0 | EN 10025-2 | |
| P | 265 | GH | EN 10028-2 |
| NB | EN 10120 | ||
| 355 | NH | EN 10028-3 | |
| M | EN 10028-5 | ||
| ML1 | EN 10028-5 | ||
| Q | EN 10028-6 |