--- title: "ČSN steel grades — 647 designations — Page 7" 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/7 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/csn/page/7.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: sha256:5f9913e1c76f9e3d34cb7e7c137a8318b346e18fee86c044b7933a01d1eff4ac generated: 2026-09-24 --- > **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/7 > Canonical URL: https://steelequivalents.com/materials/csn/page/7 > 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 7 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. Unless marked, every name here is an indicative cross-reference, not an asserted identity — the grades are close, not interchangeable. 2 of 50 rows differ and carry a “This grade’s own name” mark. ## Also known as 647 designations | Grade | Material no. | Category | C% by weight | Also in other standards | |---|---|---|---|---| | [15323](/materials/csn/15323 "15323") | [1.7766](/materials/material-no/1.7766 "1.7766") | Hydrogen resistant steels | 0.15–0.2 | 1 | | [15330](/materials/csn/15330 "15330") | [1.8519](/materials/material-no/1.8519 "1.8519") | Nitriding steels | 0.27–0.34 | 5 | | [15330](/materials/csn/15330 "15330") | [1.7707](/materials/material-no/1.7707 "1.7707") | Quenched and tempered steels | 0.26–0.34 | 8 | | [15340](/materials/csn/15340 "15340") | [1.8509](/materials/material-no/1.8509 "1.8509") | Nitriding steels | 0.38–0.45 | 16 | | [15341](/materials/csn/15341 "15341") | [1.7225](/materials/material-no/1.7225 "1.7225") | Quenched and tempered steels | 0.38–0.45 | 25 | | [15423](/materials/csn/15423 "15423") | [1.7779](/materials/material-no/1.7779 "1.7779") | Hydrogen resistant steels | 0.17–0.23 | 1 | | [15432ŠN](/materials/csn/15432sn "15432ŠN") | [1.7361](/materials/material-no/1.7361 "1.7361") | Quenched and tempered steels | 0.28–0.35 | 7 | | [15432ŠN](/materials/csn/15432sn "15432ŠN") | [1.8515](/materials/material-no/1.8515 "1.8515") | Nitriding steels | 0.28–0.35 | 8 | | [16 121](/materials/csn/16-121 "16 121") | [1.5714](/materials/material-no/1.5714 "1.5714") | Case hardening steels | 0.13–0.19 | 6 | | [16 121](/materials/csn/16-121 "16 121") | [1.5715](/materials/material-no/1.5715 "1.5715") | Case hardening steels | 0.13–0.19 | 7 | | [16 125 PH](/materials/csn/16125ph "16 125 PH") | [1.6523](/materials/material-no/1.6523 "1.6523") | Case hardening steels | 0.17–0.23 | 18 | | [16 444](/materials/csn/16-444 "16 444") | [1.6582](/materials/material-no/1.6582 "1.6582") | Quenched and tempered steels | 0.3–0.38 | 25 | | [16 520](/materials/csn/16520 "16 520") This grade’s own name | — | — | — | — | | [16 XXX NN](/materials/csn/16-xxx-nn "16 XXX NN") | [1.6511](/materials/material-no/1.6511 "1.6511") | Quenched and tempered steels | 0.32–0.4 | 18 | | [16 XXX NN](/materials/csn/16-xxx-nn "16 XXX NN") | [1.5864](/materials/material-no/1.5864 "1.5864") | Quenched and tempered steels | 0.3–0.4 | 2 | | [16125](/materials/csn/16125 "16125") | [1.6523](/materials/material-no/1.6523 "1.6523") | Case hardening steels | 0.17–0.23 | 18 | | [16125PH](/materials/csn/16125ph "16125PH") | [1.3536](/materials/material-no/1.3536 "1.3536") | Bearing steels | 0.93–1.05 | 2 | | [16220](/materials/csn/16220 "16220") | [1.5919](/materials/material-no/1.5919 "1.5919") | Case hardening steels | 0.12–0.18 | 11 | | [16220](/materials/csn/16220 "16220") | [1.5713](/materials/material-no/1.5713 "1.5713") | Others | 0.1–0.17 | 3 | | [16223PH](/materials/csn/16223ph "16223PH") | — | — | 0.09–0.16 | 1 | | [16224](/materials/csn/16224 "16224") | [1.8928](/materials/material-no/1.8928 "1.8928") | High-strength steels | ≤ 0.2 | 7 | | [16231](/materials/csn/16231 "16231") | [1.5920](/materials/material-no/1.5920 "1.5920") | Case hardening steels | 0.15–0.2 | 6 | | [16240](/materials/csn/16240 "16240") | [1.5815](/materials/material-no/1.5815 "1.5815") | Others | 0.3–0.37 | 5 | | [16240](/materials/csn/16240 "16240") | [1.5710](/materials/material-no/1.5710 "1.5710") | Quenched and tempered steels | 0.32–0.4 | 14 | | [16321](/materials/csn/16321 "16321") | [1.5919](/materials/material-no/1.5919 "1.5919") | Case hardening steels | 0.12–0.18 | 11 | | [16321 PH](/materials/csn/16321-ph "16321 PH") | [1.5919](/materials/material-no/1.5919 "1.5919") | Case hardening steels | 0.12–0.18 | 11 | | [16326](/materials/csn/16326 "16326") | [1.6587](/materials/material-no/1.6587 "1.6587") | Case hardening steels | 0.15–0.21 | 15 | | [16326PH](/materials/csn/16326ph "16326PH") | [1.6587](/materials/material-no/1.6587 "1.6587") | Case hardening steels | 0.15–0.21 | 15 | | [16329VN](/materials/csn/16329vn "16329VN") | [1.5637](/materials/material-no/1.5637 "1.5637") | Low-temperature structural steels | ≤ 0.15 | 11 | | [16341](/materials/csn/16341 "16341") | [1.6563](/materials/material-no/1.6563 "1.6563") | Others | 0.38–0.44 | 4 | | [16341](/materials/csn/16341 "16341") | [1.6511](/materials/material-no/1.6511 "1.6511") | Quenched and tempered steels | 0.32–0.4 | 18 | | [16342](/materials/csn/16342 "16342") | [1.6582](/materials/material-no/1.6582 "1.6582") | Quenched and tempered steels | 0.3–0.38 | 25 | | [16342](/materials/csn/16342 "16342") | [1.6511](/materials/material-no/1.6511 "1.6511") | Quenched and tempered steels | 0.32–0.4 | 18 | | [16343](/materials/csn/16343 "16343") | [1.6582](/materials/material-no/1.6582 "1.6582") | Quenched and tempered steels | 0.3–0.38 | 25 | | [16343](/materials/csn/16343 "16343") | [1.6511](/materials/material-no/1.6511 "1.6511") | Quenched and tempered steels | 0.32–0.4 | 18 | | [16420](/materials/csn/16420 "16420") | [1.5752](/materials/material-no/1.5752 "1.5752") | Case hardening steels | 0.14–0.2 | 15 | | [16420](/materials/csn/16420 "16420") | [1.5752](/materials/material-no/1.5752 "1.5752") | Case hardening steels | 0.14–0.2 | 15 | | [16420](/materials/csn/16420 "16420") | [1.2735](/materials/material-no/1.2735 "1.2735") | Tool steels for cold work | 0.1–0.17 | 2 | | [16420](/materials/csn/16420 "16420") | [1.5732](/materials/material-no/1.5732 "1.5732") | Case hardening steels | 0.1–0.17 | 13 | | [16430VN](/materials/csn/16430vn "16430VN") | [1.6580](/materials/material-no/1.6580 "1.6580") | Quenched and tempered steels | 0.26–0.34 | 15 | | [16430ŽH](/materials/csn/16430zh "16430ŽH") | [1.6580](/materials/material-no/1.6580 "1.6580") | Quenched and tempered steels | 0.26–0.34 | 15 | | [16431](/materials/csn/16431 "16431") | [1.6931](/materials/material-no/1.6931 "1.6931") | Others | 0.22–0.32 | 1 | | [16435](/materials/csn/16435 "16435") | [1.6580](/materials/material-no/1.6580 "1.6580") | Quenched and tempered steels | 0.26–0.34 | 15 | | [16440](/materials/csn/16440 "16440") | [1.5755](/materials/material-no/1.5755 "1.5755") | Quenched and tempered steels | 0.27–0.35 | 9 | | [16440](/materials/csn/16440 "16440") | [1.6582](/materials/material-no/1.6582 "1.6582") | Quenched and tempered steels | 0.3–0.38 | 25 | | [16520](/materials/csn/16520 "16520") This grade’s own name | — | — | — | — | | [16523](/materials/csn/16523 "16523") | [1.5860](/materials/material-no/1.5860 "1.5860") | Case hardening steels | 0.1–0.17 | 3 | | [16527VN](/materials/csn/16527vn "16527VN") | [1.5680](/materials/material-no/1.5680 "1.5680") | Low-temperature structural steels | ≤ 0.15 | 4 | | [16640](/materials/csn/16640 "16640") | [1.5864](/materials/material-no/1.5864 "1.5864") | Quenched and tempered steels | 0.3–0.4 | 2 | | [16720](/materials/csn/16720 "16720") | [1.6657](/materials/material-no/1.6657 "1.6657") | Special steels for aviation and aerospace | 0.11–0.17 | 15 | **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/6 "Previous") Page 7 of 13[Next](/materials/csn/page/8 "Next")