--- title: "ČSN steel grades — 647 designations — Page 4" description: "Steel grades designated under ČSN, with chemical composition, mechanical properties and equivalents in other standards. 647 designations across 451…" canonical: https://steelequivalents.com/materials/csn/page/4 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/csn/page/4.md cs: https://steelequivalents.com/cs/materiály/csn.md de: https://steelequivalents.com/de/werkstoffe/csn.md es: https://steelequivalents.com/es/materiales/csn.md fr: https://steelequivalents.com/fr/matériaux/csn.md hu: https://steelequivalents.com/hu/anyagok/csn.md it: https://steelequivalents.com/it/materiali/csn.md nl: https://steelequivalents.com/nl/materialen/csn.md pl: https://steelequivalents.com/pl/materiały/csn.md pt: https://steelequivalents.com/pt/materiais/csn.md ru: https://steelequivalents.com/ru/материалы/csn.md tr: https://steelequivalents.com/tr/malzemeler/csn.md zh: https://steelequivalents.com/zh/材料/csn.md ja: https://steelequivalents.com/ja/材料/csn.md ar: https://steelequivalents.com/ar/المواد/csn.md ko: https://steelequivalents.com/ko/재료/csn.md pt-br: https://steelequivalents.com/pt-br/materiais/csn.md hi: https://steelequivalents.com/hi/सामग्री/csn.md content_hash: sha256:32722a98284da76122fd5feb432e305eec6b6793b53a030319c2d4366d782c09 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/csn/page/4 > Canonical URL: https://steelequivalents.com/materials/csn/page/4 > 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. ČSN · 647 grades # ČSN steel grades — 647 designations — Page 4 Every grade designated under ČSN, 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 647 designations | Grade | Material no. | Category | C% by weight | Also in other standards | |---|---|---|---|---| | [12010](/materials/csn/12010 "12010") | [1.0334](/materials/material-no/1.0334 "1.0334") | Unalloyed structural steels | ≤ 0.1 | 11 | | [12014](/materials/csn/12014 "12014") | [1.1013](/materials/material-no/1.1013 "1.1013") | Others | ≤ 0.05 | 1 | | [12020](/materials/csn/12020 "12020") | [1.1148](/materials/material-no/1.1148 "1.1148") | Case hardening steels | 0.12–0.18 | 7 | | [12020](/materials/csn/12020 "12020") | [1.1141](/materials/material-no/1.1141 "1.1141") | Case hardening steels | 0.12–0.18 | 20 | | [12020](/materials/csn/12020 "12020") | [1.0401](/materials/material-no/1.0401 "1.0401") | Case hardening steels | 0.12–0.18 | 23 | | [12021](/materials/csn/12021 "12021") | [1.0305](/materials/material-no/1.0305 "1.0305") | Unalloyed structural steels | ≤ 0.17 | 3 | | [12021](/materials/csn/12021 "12021") | [1.0301](/materials/material-no/1.0301 "1.0301") | Case hardening steels | 0.07–0.13 | 20 | | [12022](/materials/csn/12022 "12022") | [1.0405](/materials/material-no/1.0405 "1.0405") | Unalloyed structural steels | ≤ 0.21 | 3 | | [12022](/materials/csn/12022 "12022") | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [12022](/materials/csn/12022 "12022") | [1.0436](/materials/material-no/1.0436 "1.0436") | Fine-grain structural steels | 0.15–0.2 | 14 | | [12022](/materials/csn/12022 "12022") | [1.1133](/materials/material-no/1.1133 "1.1133") | Quenched and tempered steels | 0.17–0.23 | 20 | | [12023](/materials/csn/12023 "12023") | [1.1141](/materials/material-no/1.1141 "1.1141") | Case hardening steels | 0.12–0.18 | 20 | | [12023](/materials/csn/12023 "12023") | [1.0401](/materials/material-no/1.0401 "1.0401") | Case hardening steels | 0.12–0.18 | 23 | | [12024](/materials/csn/12024 "12024") | [1.0402](/materials/material-no/1.0402 "1.0402") | Quenched and tempered steels | 0.17–0.24 | 24 | | [12024](/materials/csn/12024 "12024") | [1.1151](/materials/material-no/1.1151 "1.1151") | Quenched and tempered steels | 0.17–0.24 | 15 | | [12030](/materials/csn/12030 "12030") | [1.0406](/materials/material-no/1.0406 "1.0406") | Quenched and tempered steels | 0.22–0.29 | 20 | | [12030](/materials/csn/12030 "12030") | [1.1158](/materials/material-no/1.1158 "1.1158") | Quenched and tempered steels | 0.22–0.29 | 12 | | [12031](/materials/csn/12031 "12031") | [1.0528](/materials/material-no/1.0528 "1.0528") | Quenched and tempered steels | 0.27–0.34 | 14 | | [12031](/materials/csn/12031 "12031") | [1.1178](/materials/material-no/1.1178 "1.1178") | Quenched and tempered steels | 0.27–0.34 | 13 | | [12031](/materials/csn/12031 "12031") | [1.1179](/materials/material-no/1.1179 "1.1179") | Quenched and tempered steels | 0.27–0.34 | 8 | | [12040](/materials/csn/12040 "12040") | [1.0501](/materials/material-no/1.0501 "1.0501") | Quenched and tempered steels | 0.32–0.39 | 23 | | [12040](/materials/csn/12040 "12040") | [1.1181](/materials/material-no/1.1181 "1.1181") | Quenched and tempered steels | 0.32–0.39 | 20 | | [12041](/materials/csn/12041 "12041") | [1.0511](/materials/material-no/1.0511 "1.0511") | Quenched and tempered steels | 0.37–0.44 | 21 | | [12041](/materials/csn/12041 "12041") | [1.1186](/materials/material-no/1.1186 "1.1186") | Quenched and tempered steels | 0.37–0.44 | 16 | | [12042](/materials/csn/12042 "12042") | [1.5511](/materials/material-no/1.5511 "1.5511") | Others | 0.32–0.39 | 3 | | [12050](/materials/csn/12050 "12050") | [1.0503](/materials/material-no/1.0503 "1.0503") | Quenched and tempered steels | 0.42–0.5 | 24 | | [12050](/materials/csn/12050 "12050") | [1.1191](/materials/material-no/1.1191 "1.1191") | Quenched and tempered steels | 0.42–0.5 | 21 | | [12050](/materials/csn/12050 "12050") | [1.1191](/materials/material-no/1.1191 "1.1191") | Others | 0.42–0.5 | 18 | | [12051](/materials/csn/12051 "12051") | [1.0540](/materials/material-no/1.0540 "1.0540") | Quenched and tempered steels | 0.47–0.55 | 13 | | [12051](/materials/csn/12051 "12051") | [1.1206](/materials/material-no/1.1206 "1.1206") | Quenched and tempered steels | 0.47–0.55 | 17 | | [12051](/materials/csn/12051 "12051") | [1.1241](/materials/material-no/1.1241 "1.1241") | Steels for surface hardening | 0.47–0.55 | 8 | | [12051](/materials/csn/12051 "12051") | [1.1213](/materials/material-no/1.1213 "1.1213") | Steels for surface hardening | 0.5–0.57 | 11 | | [12051](/materials/csn/12051 "12051") | [1.0535](/materials/material-no/1.0535 "1.0535") | Quenched and tempered steels | 0.52–0.6 | 21 | | [12056](/materials/csn/12056 "12056") | [1.0503](/materials/material-no/1.0503 "1.0503") | Quenched and tempered steels | 0.42–0.5 | 24 | | [12060](/materials/csn/12060 "12060") | [1.0535](/materials/material-no/1.0535 "1.0535") | Quenched and tempered steels | 0.52–0.6 | 21 | | [12060](/materials/csn/12060 "12060") | [1.1203](/materials/material-no/1.1203 "1.1203") | Quenched and tempered steels | 0.52–0.6 | 15 | | [12060](/materials/csn/12060 "12060") | [1.1219](/materials/material-no/1.1219 "1.1219") | Unalloyed bearing steels | 0.52–0.6 | 3 | | [12061](/materials/csn/12061 "12061") | [1.0601](/materials/material-no/1.0601 "1.0601") | Quenched and tempered steels | 0.57–0.65 | 25 | | [12061](/materials/csn/12061 "12061") | [1.1221](/materials/material-no/1.1221 "1.1221") | Quenched and tempered steels | 0.57–0.65 | 18 | | [12071](/materials/csn/12071 "12071") | [1.0603](/materials/material-no/1.0603 "1.0603") | Spring steels | 0.65–0.72 | 10 | | [12071](/materials/csn/12071 "12071") | [1.1744](/materials/material-no/1.1744 "1.1744") | Unalloyed tool steels / carbon steels | 0.64–0.72 | 1 | | [12071](/materials/csn/12071 "12071") | [1.0612](/materials/material-no/1.0612 "1.0612") | Others | 0.63–0.68 | 12 | | [12071](/materials/csn/12071 "12071") | [1.1231](/materials/material-no/1.1231 "1.1231") | Spring steels | 0.65–0.73 | 18 | | [12081](/materials/csn/12081 "12081") | [1.1248](/materials/material-no/1.1248 "1.1248") | Spring steels | 0.7–0.8 | 11 | | [12081](/materials/csn/12081 "12081") | [1.1249](/materials/material-no/1.1249 "1.1249") | Steels for surface hardening | 0.68–0.75 | 2 | | [12081](/materials/csn/12081 "12081") | [1.0605](/materials/material-no/1.0605 "1.0605") | Spring steels | 0.7–0.8 | 11 | | [12081](/materials/csn/12081 "12081") | [1.2003](/materials/material-no/1.2003 "1.2003") | Tool steels for cold work | 0.7–0.8 | 9 | | [12090](/materials/csn/12090 "12090") | [1.1269](/materials/material-no/1.1269 "1.1269") | Spring steels | 0.8–0.9 | 14 | | [13 151](/materials/csn/13-151 "13 151") | [1.5024](/materials/material-no/1.5024 "1.5024") | Spring steels | 0.42–0.5 | 6 | | [13 180](/materials/csn/13180 "13 180") | [1.1260](/materials/material-no/1.1260 "1.1260") | Others | 0.6–0.71 | 7 | **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. [Previous](/materials/csn/page/3 "Previous") Page 4 of 13[Next](/materials/csn/page/5 "Next")