ISO steel grades — 531 designations — Page 11
Every grade designated under ISO, with the material number it maps to, what kind of steel it is, its carbon window and how many other standards carry it. Open a grade for its full composition, properties and its designations in other standards. Every name on this page is an indicative cross-reference, not an asserted identity: the grades are close, not interchangeable. Check the composition before you substitute.
Also known as
531 designations| Grade | Material no. | Category | C% by weight | Also inother standards |
|---|---|---|---|---|
| X35CrMoV5 | 1.2605 | Tool steels for hot work | 0.32–0.4 | 5 |
| X35CrMoV5 | 1.2606 | Tool steels for hot work | 0.32–0.4 | 8 |
| X37CrMoV5-1 | 1.2344 | Tool steels for hot work | 0.35–0.42 | 20 |
| X37CrMoV5-1 | 1.2343 | Tool steels for hot work | 0.33–0.41 | 20 |
| X38CrMo16 | 1.4122 | Stainless steels | 0.33–0.45 | 5 |
| X38CrMo16 | 1.4122 | Stainless steels | 0.33–0.43 | 5 |
| X38CrMo16 | 1.2316 | Tool steels for cold work | 0.33–0.45 | 4 |
| X38CrMoV5-3 | 1.2367 | Tool steels for hot work | 0.35–0.4 | 2 |
| X40Cr14 | 1.4035 | Others | 0.43–0.5 | 5 |
| X40Cr14 | 1.4034 | Stainless steels | 0.43–0.5 | 18 |
| X40Cr14 | 1.2083 | Tool steels for cold work | 0.36–0.42 | 16 |
| X40Cr14 | 1.4031 | Stainless steels | 0.36–0.42 | 18 |
| X40CrMoV5-1 | 1.2343 | Tool steels for hot work | 0.33–0.41 | 20 |
| X40CrMoV5-1 | 1.2344 | Tool steels for hot work | 0.35–0.42 | 20 |
| X50CrSi8-2 | 1.4718 | Valve steels | 0.4–0.5 | 16 |
| X50CrSi8-2 | 1.4718 | Others | 0.4–0.5 | 16 |
| X5CrNi18-10 | 1.4301 | Stainless steels | ≤ 0.07 | 23 |
| X6CrNi23-14 | 1.4833 | Heat resistant steels | ≤ 0.15 | 15 |
| X6CrNi23-14 | 1.4950 | Heat resistant steels | 0.04–0.08 | 7 |
| X6CrNi25-21 | 1.4335 | Stainless steels | ≤ 0.02 | 9 |
| X6CrNi25-21 | 1.4845 | Heat resistant steels | ≤ 0.1 | 21 |
| X6CrNi25-21 | 1.4951 | Heat resistant steels | 0.04–0.08 | 8 |
| X6CrTi12 | 1.4512 | Stainless steels | ≤ 0.03 | 10 |
| X7CrNi18-9 | 1.4948 | High-temperature steels | 0.04–0.08 | 8 |
| X7CrNiAl17-7 | 1.4568 | Stainless steels | ≤ 0.09 | 12 |
| X7CrNiSiNCe21-11 | 1.4835 | Heat resistant steels | 0.05–0.12 | 5 |
| X7CrNiTi18-10 | 1.4878 | Heat resistant steels | ≤ 0.1 | 14 |
| X8NiCrAlTi32-21 | 1.4876 | Heat resistant steels | ≤ 0.12 | 12 |
| X9CrNi18-8 | 1.4310 | Stainless steels | 0.05–0.15 | 18 |
| X9Ni5 | 1.5637 | Low-temperature structural steels | ≤ 0.15 | 11 |
| X9Ni5 | 1.5639 | Low-temperature structural steels | 0.12–0.19 | 9 |
This grade’s own name — recorded in our sources as this grade’s own designation under that standard.
Indicative — taken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering.
Withdrawn — designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.