ISO steel grades — 531 designations
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 |
|---|---|---|---|---|
| 100 | EN-JL1010 | Others | — | 16 |
| 100Cr6 | 1.3505 | Bearing steels | 0.93–1.05 | 22 |
| 100Cr6 | 1.2067 | Tool steels for cold work | 0.95–1.1 | 21 |
| 100CrMnSi6-4 | 1.3520 | Bearing steels | 0.93–1.05 | 16 |
| 100CrMo7 | 1.3538 | Others | 0.93–1.05 | 2 |
| 100CrMo7 | 1.2303 | Tool steels for cold work | 0.9–1.1 | 4 |
| 100CrMo7 | 1.3537 | Others | 0.93–1.05 | 4 |
| 100CrMo7-4 | 1.3537 | Others | 0.93–1.05 | 4 |
| 100CrMo7-4 | 1.2303 | Tool steels for cold work | 0.9–1.1 | 4 |
| 100CrMo7-4 | 1.3538 | Others | 0.93–1.05 | 2 |
| 105WCr1 | 1.2419 | Tool steels for cold work | 1–1.1 | 16 |
| 11MnPb28 | 1.0718 | Free cutting steels | ≤ 0.14 | 11 |
| 13-5-2 | 1.4415 | Others | ≤ 0.03 | 3 |
| 14CrMo4-5 | 1.7336 | Heat-resistant structural steels | ≤ 0.17 | 6 |
| 14CrMo4-5 | 1.7335 | Heat-resistant structural steels | 0.08–0.18 | 22 |
| 150 | EN-JL1020 | Others | — | 22 |
| 15CrMo4 | 1.7243 | Case hardening steels | 0.15–0.21 | 12 |
| 15CrMo4 | 1.3566 | Others | 0.12–0.18 | 8 |
| 15NiCr13 | 1.5752 | Case hardening steels | 0.14–0.2 | 15 |
| 15NiCr13 | 1.5752 | Case hardening steels | 0.14–0.2 | 15 |
| 16MnCr5 | 1.7147 | Case hardening steels | 0.17–0.22 | 15 |
| 16MnCr5 | 1.7149 | Case hardening steels | 0.17–0.22 | 8 |
| 16MnCr5 | 1.2162 | Tool steels for cold work | 0.18–0.24 | 7 |
| 16MnCr5 | 1.7131 | Case hardening steels | 0.14–0.19 | 24 |
| 16MnCr5 | 1.7139 | Case hardening steels | 0.14–0.19 | 11 |
| 16MnCrS5 | 1.7131 | Case hardening steels | 0.14–0.19 | 24 |
| 16MnCrS5 | 1.7147 | Case hardening steels | 0.17–0.22 | 15 |
| 16MnCrS5 | 1.7149 | Case hardening steels | 0.17–0.22 | 8 |
| 16MnCrS5 | 1.2162 | Tool steels for cold work | 0.18–0.24 | 7 |
| 16MnCrS5 | 1.7139 | Case hardening steels | 0.14–0.19 | 11 |
| 17NiCrMo6 | 1.6566 | Case hardening steels | 0.14–0.2 | 7 |
| 18CrMo4 | 1.7243 | Case hardening steels | 0.15–0.21 | 12 |
| 18CrMoS4 | 1.7243 | Case hardening steels | 0.15–0.21 | 12 |
| 18CrMoS4 | 1.7244 | Case hardening steels | 0.15–0.21 | 2 |
| 18CrNiMo7 | 1.6587 | Case hardening steels | 0.15–0.21 | 15 |
| 20-40 | 1.0416 | Others | 0.15–0.2 | 17 |
| 200 | EN-JL1030 | Others | — | 22 |
| 200-400 | 1.0416 | Others | 0.15–0.2 | 17 |
| 20Cr4 | 1.3523 | Case hardening steels | 0.17–0.22 | 8 |
| 20Cr4 | 1.7147 | Case hardening steels | 0.17–0.22 | 15 |
| 20Cr4 | 1.7027 | Case hardening steels | 0.17–0.23 | 12 |
| 20Cr4H | 1.3523 | Case hardening steels | 0.17–0.22 | 8 |
| 20Cr4H | 1.7147 | Case hardening steels | 0.17–0.22 | 15 |
| 20CrMo4 | 1.7218 | Quenched and tempered steels | 0.22–0.29 | 25 |
| 20CrMo4 | 1.3567 | Others | 0.17–0.23 | 7 |
| 20CrMo4 | — | — | 0.18–0.23 | 3 |
| 20CrS4 | 1.3523 | Case hardening steels | 0.17–0.22 | 8 |
| 20CrS4 | 1.7147 | Case hardening steels | 0.17–0.22 | 15 |
| 20CrS4 | 1.7027 | Case hardening steels | 0.17–0.23 | 12 |
| 20MnCr5 | 1.7139 | Case hardening steels | 0.14–0.19 | 11 |
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.