--- title: "NBN steel grades — 100 designations" description: "Steel grades designated under NBN, with chemical composition, mechanical properties and equivalents in other standards. 100 designations across 75…" canonical: https://steelequivalents.com/materials/nbn language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/nbn.md cs: https://steelequivalents.com/cs/materiály/nbn.md de: https://steelequivalents.com/de/werkstoffe/nbn.md es: https://steelequivalents.com/es/materiales/nbn.md fr: https://steelequivalents.com/fr/matériaux/nbn.md hu: https://steelequivalents.com/hu/anyagok/nbn.md it: https://steelequivalents.com/it/materiali/nbn.md nl: https://steelequivalents.com/nl/materialen/nbn.md pl: https://steelequivalents.com/pl/materiały/nbn.md pt: https://steelequivalents.com/pt/materiais/nbn.md ru: https://steelequivalents.com/ru/материалы/nbn.md tr: https://steelequivalents.com/tr/malzemeler/nbn.md zh: https://steelequivalents.com/zh/材料/nbn.md ja: https://steelequivalents.com/ja/材料/nbn.md ar: https://steelequivalents.com/ar/المواد/nbn.md ko: https://steelequivalents.com/ko/재료/nbn.md pt-br: https://steelequivalents.com/pt-br/materiais/nbn.md hi: https://steelequivalents.com/hi/सामग्री/nbn.md content_hash: sha256:0c01f65412fcf236f2aff6e71b0529f0ab180dad306de5de5e73ee24d3984a8c generated: 2026-09-22 --- > **Machine-readable Markdown rendering.** This is a Markdown representation of a web page, > served for AI agents and crawlers as a token-efficient alternative to the full HTML. > Full interactive HTML version: https://steelequivalents.com/materials/nbn > Canonical URL: https://steelequivalents.com/materials/nbn > Available languages: en, cs, de, es, fr, hu, it, nl, pl, pt, ru, tr, zh, ja, ar, ko, pt-br, hi > Change detection: `content_hash` is the SHA-256 of this document's Markdown body — everything > below this block, whitespace-trimmed, excluding the front-matter. Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. NBN · 100 grades # NBN steel grades — 100 designations Every grade designated under NBN, 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 100 designations | Grade | Material no. | Category | C% by weight | Also in other standards | |---|---|---|---|---| | [14CrMo45](/materials/afnor/14crmo45 "14CrMo45") | [1.7262](/materials/material-no/1.7262 "1.7262") | Case hardening steels | 0.13–0.17 | 18 | | [14CrMo45](/materials/afnor/14crmo45 "14CrMo45") | [1.7335](/materials/material-no/1.7335 "1.7335") | Heat-resistant structural steels | 0.08–0.18 | 22 | | [15Cr2](/materials/nbn/15cr2 "15Cr2") | [1.7015](/materials/material-no/1.7015 "1.7015") | Case hardening steels | 0.12–0.18 | 15 | | [16MnCr5](/materials/din-en/16mncr5 "16MnCr5") | [1.7131](/materials/material-no/1.7131 "1.7131") | Case hardening steels | 0.14–0.19 | 24 | | [25CrMo4](/materials/din-en/25crmo4 "25CrMo4") | [1.7218](/materials/material-no/1.7218 "1.7218") | Quenched and tempered steels | 0.22–0.29 | 25 | | [28Mn6](/materials/din-en/28mn6 "28Mn6") | [1.1170](/materials/material-no/1.1170 "1.1170") | Quenched and tempered steels | 0.25–0.32 | 16 | | [28Mn6](/materials/din-en/28mn6 "28Mn6") | [1.1165](/materials/material-no/1.1165 "1.1165") | Quenched and tempered steels | 0.25–0.32 | 16 | | [34Cr4](/materials/din-en/34cr4 "34Cr4") | [1.7033](/materials/material-no/1.7033 "1.7033") | Quenched and tempered steels | 0.3–0.37 | 18 | | [34CrMo4](/materials/din-en/34crmo4 "34CrMo4") | [1.7220](/materials/material-no/1.7220 "1.7220") | Quenched and tempered steels | 0.3–0.37 | 24 | | [35CrNiMo6](/materials/din-en/35crnimo6 "35CrNiMo6") | [1.6582](/materials/material-no/1.6582 "1.6582") | Quenched and tempered steels | 0.3–0.38 | 25 | | [37Cr4](/materials/din-en/37cr4 "37Cr4") | [1.7034](/materials/material-no/1.7034 "1.7034") | Quenched and tempered steels | 0.34–0.41 | 23 | | [40NiCrMo2](/materials/une/40nicrmo2 "40NiCrMo2") | [1.6546](/materials/material-no/1.6546 "1.6546") | Quenched and tempered steels | 0.37–0.44 | 14 | | [41Cr4](/materials/din-en/41cr4 "41Cr4") | [1.7034](/materials/material-no/1.7034 "1.7034") | Quenched and tempered steels | 0.34–0.41 | 23 | | [41CrMo4](/materials/din-en/41crmo4 "41CrMo4") | [1.7223](/materials/material-no/1.7223 "1.7223") | Steels for surface hardening | 0.38–0.44 | 13 | | [45C4](/materials/afnor/45c4 "45C4") | [1.7034](/materials/material-no/1.7034 "1.7034") | Quenched and tempered steels | 0.34–0.41 | 23 | | [50CrV4](/materials/din-en/50crv4 "50CrV4") | [1.8159](/materials/material-no/1.8159 "1.8159") | Quenched and tempered steels | 0.47–0.55 | 27 | | [55Cr3](/materials/din-en/55cr3 "55Cr3") | [1.7176](/materials/material-no/1.7176 "1.7176") | Spring steels | 0.52–0.59 | 18 | | [55Si7](/materials/din-en/55si7 "55Si7") | [1.5026](/materials/material-no/1.5026 "1.5026") | Spring steels | 0.52–0.6 | 20 | | [60Si7](/materials/din-en/60si7 "60Si7") | [1.0961](/materials/material-no/1.0961 "1.0961") | High-strength multi-phase steels | ≤ 0.18 | 14 | | [A320](/materials/nbn/a320 "A320") | [1.0035](/materials/material-no/1.0035 "1.0035") | Unalloyed structural steels | — | 22 | | [A490-1.2](/materials/nbn/a490-1-2 "A490-1.2") | [1.0050](/materials/material-no/1.0050 "1.0050") | Unalloyed structural steels | — | 23 | | [A490-1.2](/materials/nbn/a490-1-2 "A490-1.2") | [1.0050](/materials/material-no/1.0050 "1.0050") | Unalloyed structural steels | — | 23 | | [A590-1.2](/materials/nbn/a590-1-2 "A590-1.2") | [1.0060](/materials/material-no/1.0060 "1.0060") | Unalloyed structural steels | — | 21 | | [A590-1.2](/materials/nbn/a590-1-2 "A590-1.2") | [1.0060](/materials/material-no/1.0060 "1.0060") | Unalloyed structural steels | — | 21 | | [A690-1.2](/materials/nbn/a690-1-2 "A690-1.2") | [1.0070](/materials/material-no/1.0070 "1.0070") | Unalloyed structural steels | — | 16 | | [A690-1.2](/materials/nbn/a690-1-2 "A690-1.2") | [1.0070](/materials/material-no/1.0070 "1.0070") | Unalloyed structural steels | — | 16 | | [AE235C](/materials/une/ae235c "AE235C") | [1.0114](/materials/material-no/1.0114 "1.0114") | Unalloyed structural steels | ≤ 0.17 | 21 | | [AE255D](/materials/nbn/ae255d "AE255D") | [1.0144](/materials/material-no/1.0144 "1.0144") | Unalloyed structural steels | ≤ 0.18 | 22 | | [AE275-B](/materials/une/ae275b "AE275-B") | [1.0128](/materials/material-no/1.0128 "1.0128") | Unalloyed structural steels | ≤ 0.21 | 5 | | [AE295B](/materials/nbn/ae295b "AE295B") | [1.0044](/materials/material-no/1.0044 "1.0044") | Unalloyed structural steels | ≤ 0.21 | 26 | | [AE295C](/materials/nbn/ae295c "AE295C") | [1.0143](/materials/material-no/1.0143 "1.0143") | Unalloyed structural steels | ≤ 0.18 | 16 | | [AE295DD](/materials/nbn/ae295dd "AE295DD") | [1.0145](/materials/material-no/1.0145 "1.0145") | Unalloyed structural steels | ≤ 0.18 | 8 | | [AE355-C](/materials/une/ae355c "AE355-C") | [1.0554](/materials/material-no/1.0554 "1.0554") | Unalloyed structural steels | ≤ 0.2 | 8 | | [AE355-DD](/materials/une/ae355dd "AE355-DD") | [1.0595](/materials/material-no/1.0595 "1.0595") | Others | ≤ 0.2 | 7 | | [AE355B](/materials/une/ae355b "AE355B") | [1.0045](/materials/material-no/1.0045 "1.0045") | Unalloyed structural steels | ≤ 0.24 | 17 | | [AE355C](/materials/une/ae355c "AE355C") | [1.0553](/materials/material-no/1.0553 "1.0553") | Unalloyed structural steels | ≤ 0.2 | 20 | | [C10-2](/materials/une/c102 "C10-2") | [1.1121](/materials/material-no/1.1121 "1.1121") | Case hardening steels | 0.07–0.13 | 22 | | [C16-2](/materials/nbn/c16-2 "C16-2") | [1.0401](/materials/material-no/1.0401 "1.0401") | Case hardening steels | 0.12–0.18 | 23 | | [C25-1](/materials/nbn/c25-1 "C25-1") | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [C25-2](/materials/nbn/c25-2 "C25-2") | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [C25-2](/materials/nbn/c25-2 "C25-2") | [1.0406](/materials/material-no/1.0406 "1.0406") | Quenched and tempered steels | 0.22–0.29 | 20 | | [C35](/materials/din-en/c35 "C35") | [1.0501](/materials/material-no/1.0501 "1.0501") | Quenched and tempered steels | 0.32–0.39 | 23 | | [C35-1](/materials/nbn/c35-1 "C35-1") | [1.0501](/materials/material-no/1.0501 "1.0501") | Quenched and tempered steels | 0.32–0.39 | 23 | | [C35-2](/materials/nbn/c35-2 "C35-2") | [1.0501](/materials/material-no/1.0501 "1.0501") | Quenched and tempered steels | 0.32–0.39 | 23 | | [C36](/materials/nbn/c36 "C36") | [1.0501](/materials/material-no/1.0501 "1.0501") | Quenched and tempered steels | 0.32–0.39 | 23 | | [C40-2](/materials/nbn/c40-2 "C40-2") | [1.0511](/materials/material-no/1.0511 "1.0511") | Quenched and tempered steels | 0.37–0.44 | 21 | | [C45-1](/materials/nbn/c45-1 "C45-1") | [1.0503](/materials/material-no/1.0503 "1.0503") | Quenched and tempered steels | 0.42–0.5 | 24 | | [C45-2](/materials/nbn/c45-2 "C45-2") | [1.0503](/materials/material-no/1.0503 "1.0503") | Quenched and tempered steels | 0.42–0.5 | 24 | | [C46](/materials/din-en/c46 "C46") | [1.0503](/materials/material-no/1.0503 "1.0503") | Quenched and tempered steels | 0.42–0.5 | 24 | | [C53](/materials/nbn/c53 "C53") | [1.0535](/materials/material-no/1.0535 "1.0535") | Quenched and tempered steels | 0.52–0.6 | 21 | **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. Page 1 of 2[Next](/materials/nbn/page/2 "Next")