--- title: "ISO steel grades — 531 designations — Page 3" description: "Steel grades designated under ISO, with chemical composition, mechanical properties and equivalents in other standards. 531 designations across 327…" canonical: https://steelequivalents.com/materials/iso/page/3 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/iso/page/3.md cs: https://steelequivalents.com/cs/materiály/iso.md de: https://steelequivalents.com/de/werkstoffe/iso.md es: https://steelequivalents.com/es/materiales/iso.md fr: https://steelequivalents.com/fr/matériaux/iso.md hu: https://steelequivalents.com/hu/anyagok/iso.md it: https://steelequivalents.com/it/materiali/iso.md nl: https://steelequivalents.com/nl/materialen/iso.md pl: https://steelequivalents.com/pl/materiały/iso.md pt: https://steelequivalents.com/pt/materiais/iso.md ru: https://steelequivalents.com/ru/материалы/iso.md tr: https://steelequivalents.com/tr/malzemeler/iso.md zh: https://steelequivalents.com/zh/材料/iso.md ja: https://steelequivalents.com/ja/材料/iso.md ar: https://steelequivalents.com/ar/المواد/iso.md ko: https://steelequivalents.com/ko/재료/iso.md pt-br: https://steelequivalents.com/pt-br/materiais/iso.md hi: https://steelequivalents.com/hi/सामग्री/iso.md content_hash: sha256:465cd51fb2895962a17abe5ee751f2f4b13778c80400b8ffe95c253011fde7b6 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/iso/page/3 > Canonical URL: https://steelequivalents.com/materials/iso/page/3 > 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. ISO · 531 grades # ISO steel grades — 531 designations — Page 3 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 in other standards | |---|---|---|---|---| | [35S20](/materials/jis/35s20 "35S20") | [1.0726](/materials/material-no/1.0726 "1.0726") | Free cutting steels | 0.32–0.39 | 15 | | [35SMn20](/materials/jis/35smn20 "35SMn20") | [1.0762](/materials/material-no/1.0762 "1.0762") | Free cutting steels | 0.4–0.48 | 20 | | [36CrNiMo4](/materials/din-en/36crnimo4 "36CrNiMo4") | [1.6511](/materials/material-no/1.6511 "1.6511") | Quenched and tempered steels | 0.32–0.4 | 18 | | [36CrNiMo6](/materials/iso/36crnimo6 "36CrNiMo6") | [1.6582](/materials/material-no/1.6582 "1.6582") | Quenched and tempered steels | 0.3–0.38 | 25 | | [36Mn6](/materials/din-en/36mn6 "36Mn6") | [1.1167](/materials/material-no/1.1167 "1.1167") | Quenched and tempered steels | 0.32–0.4 | 17 | | [36Mn6H](/materials/iso/36mn6h "36Mn6H") | [1.1167](/materials/material-no/1.1167 "1.1167") | Quenched and tempered steels | 0.32–0.4 | 17 | | [37Cr4](/materials/din-en/37cr4 "37Cr4") | [1.7035](/materials/material-no/1.7035 "1.7035") | Quenched and tempered steels | 0.38–0.45 | 18 | | [37Cr4](/materials/din-en/37cr4 "37Cr4") | [1.7034](/materials/material-no/1.7034 "1.7034") | Quenched and tempered steels | 0.34–0.41 | 23 | | [37CrS4](/materials/din-en/37crs4 "37CrS4") | [1.7034](/materials/material-no/1.7034 "1.7034") | Quenched and tempered steels | 0.34–0.41 | 23 | | [37CrS4](/materials/din-en/37crs4 "37CrS4") | [1.7035](/materials/material-no/1.7035 "1.7035") | Quenched and tempered steels | 0.38–0.45 | 18 | | [37CrS4](/materials/din-en/37crs4 "37CrS4") | [1.7038](/materials/material-no/1.7038 "1.7038") | Quenched and tempered steels | 0.34–0.41 | 7 | | [38Si7](/materials/din-en/38si7 "38Si7") | [1.0901](/materials/material-no/1.0901 "1.0901") | Others | 0.35–0.42 | 2 | | [400-12](/materials/iso/400-12 "400-12") | [EN-JS1030](/materials/material-no/en-js1030 "EN-JS1030") | Others | — | 17 | | [400-12](/materials/iso/400-12 "400-12") | [EN-JS1072](/materials/material-no/en-js1072 "EN-JS1072") | Others | — | 17 | | [400-12](/materials/iso/400-12 "400-12") | [EN-JS1073](/materials/material-no/en-js1073 "EN-JS1073") | Others | — | 17 | | [400-15](/materials/iso/400-15 "400-15") | [EN-JS1030](/materials/material-no/en-js1030 "EN-JS1030") | Others | — | 17 | | [400-15](/materials/iso/400-15 "400-15") | [EN-JS1072](/materials/material-no/en-js1072 "EN-JS1072") | Others | — | 17 | | [400-15](/materials/iso/400-15 "400-15") | [EN-JS1073](/materials/material-no/en-js1073 "EN-JS1073") | Others | — | 17 | | [40CrMoV5](/materials/iso/40crmov5 "40CrMoV5") | [1.2344](/materials/material-no/1.2344 "1.2344") | Tool steels for hot work | 0.35–0.42 | 20 | | [41Cr4](/materials/din-en/41cr4 "41Cr4") | [1.7035](/materials/material-no/1.7035 "1.7035") | Quenched and tempered steels | 0.38–0.45 | 18 | | [41CrNiMo2](/materials/iso/41crnimo2 "41CrNiMo2") | — | — | — | 2 | | [41CrNiMoS2](/materials/iso/41crnimos2 "41CrNiMoS2") | — | — | — | 2 | | [41CrS4](/materials/din-en/41crs4 "41CrS4") | [1.7035](/materials/material-no/1.7035 "1.7035") | Quenched and tempered steels | 0.38–0.45 | 18 | | [41CrS4](/materials/din-en/41crs4 "41CrS4") | [1.7039](/materials/material-no/1.7039 "1.7039") | Quenched and tempered steels | 0.38–0.45 | 13 | | [42CrMo4](/materials/din-en/42crmo4 "42CrMo4") | [1.7225](/materials/material-no/1.7225 "1.7225") | Quenched and tempered steels | 0.38–0.45 | 25 | | [42CrMo4](/materials/din-en/42crmo4 "42CrMo4") | — | — | 0.38–0.43 | 4 | | [42CrMo4E](/materials/iso/42crmo4e "42CrMo4E") | — | — | 0.38–0.45 | 4 | | [42CrMoS4](/materials/din-en/42crmos4 "42CrMoS4") | [1.7225](/materials/material-no/1.7225 "1.7225") | Quenched and tempered steels | 0.38–0.45 | 25 | | [42CrMoS4](/materials/din-en/42crmos4 "42CrMoS4") | [1.7227](/materials/material-no/1.7227 "1.7227") | Quenched and tempered steels | 0.38–0.45 | 15 | | [42Mn6](/materials/iso/42mn6 "42Mn6") | [1.1127](/materials/material-no/1.1127 "1.1127") | Quenched and tempered steels | 0.34–0.42 | 6 | | [42Mn6](/materials/iso/42mn6 "42Mn6") | [1.1167](/materials/material-no/1.1167 "1.1167") | Quenched and tempered steels | 0.32–0.4 | 17 | | [44SMn28](/materials/jis/44smn28 "44SMn28") | [1.0762](/materials/material-no/1.0762 "1.0762") | Free cutting steels | 0.4–0.48 | 20 | | [4509-439-40-x](/materials/iso/4509-439-40-x "4509-439-40-x") | [1.4509](/materials/material-no/1.4509 "1.4509") | Stainless steels | ≤ 0.03 | 4 | | [45NiCrMo16](/materials/din-en/45nicrmo16 "45NiCrMo16") | [1.2766](/materials/material-no/1.2766 "1.2766") | Tool steels for hot work | 0.32–0.38 | 5 | | [45NiCrMo16](/materials/din-en/45nicrmo16 "45NiCrMo16") | [1.2767](/materials/material-no/1.2767 "1.2767") | Tool steels for cold work | 0.4–0.5 | 9 | | [45WCrV7](/materials/din-en/45wcrv7 "45WCrV7") | [1.2550](/materials/material-no/1.2550 "1.2550") | Tool steels for cold work | 0.55–0.65 | 15 | | [45WCrV7](/materials/din-en/45wcrv7 "45WCrV7") | [1.2542](/materials/material-no/1.2542 "1.2542") | Tool steels for cold work | 0.4–0.5 | 12 | | [46Cr2](/materials/din-en/46cr2 "46Cr2") | [1.7034](/materials/material-no/1.7034 "1.7034") | Quenched and tempered steels | 0.34–0.41 | 23 | | [46S20](/materials/jis/46s20 "46S20") | [1.0727](/materials/material-no/1.0727 "1.0727") | Free cutting steels | 0.42–0.5 | 8 | | [500-7](/materials/bs/500-7 "500-7") | [EN-JS1082](/materials/material-no/en-js1082 "EN-JS1082") | Others | — | 20 | | [500-7](/materials/bs/500-7 "500-7") | [EN-JS1083](/materials/material-no/en-js1083 "EN-JS1083") | Others | — | 20 | | [50CrMo4](/materials/din-en/50crmo4 "50CrMo4") | [1.7228](/materials/material-no/1.7228 "1.7228") | Quenched and tempered steels | 0.46–0.54 | 12 | | [51CrV4](/materials/din-en/51crv4 "51CrV4") | [1.8159](/materials/material-no/1.8159 "1.8159") | Quenched and tempered steels | 0.47–0.55 | 27 | | [52CrMoV4](/materials/din-en/52crmov4 "52CrMoV4") | — | — | 0.48–0.56 | 2 | | [55NiCrMoV7](/materials/din-en/55nicrmov7 "55NiCrMoV7") | [1.2713](/materials/material-no/1.2713 "1.2713") | Tool steels for cold work | 0.5–0.6 | 12 | | [55NiCrMoV7](/materials/din-en/55nicrmov7 "55NiCrMoV7") | [1.2714](/materials/material-no/1.2714 "1.2714") | Tool steels for hot work | 0.5–0.6 | 15 | | [55SiCr63](/materials/din-en/55sicr6-3 "55SiCr63") | [1.7102](/materials/material-no/1.7102 "1.7102") | Spring steels | 0.51–0.59 | 14 | | [56Mn4](/materials/din-en/56mn4 "56Mn4") | [1.1260](/materials/material-no/1.1260 "1.1260") | Others | 0.6–0.71 | 7 | | [56Mn4](/materials/din-en/56mn4 "56Mn4") | [1.1240](/materials/material-no/1.1240 "1.1240") | Others | 0.6–0.7 | 10 | | [56Mn4](/materials/din-en/56mn4 "56Mn4") | [1.1233](/materials/material-no/1.1233 "1.1233") | Quenched and tempered steels | 0.52–0.6 | 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/iso/page/2 "Previous") Page 3 of 11[Next](/materials/iso/page/4 "Next")