--- title: "ISO steel grades — 531 designations" 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 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/iso.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: sha256:332ce1f8c2df21639c74aa51fcfaeccf493e47ccc7853ea155432977bc181686 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 > Canonical URL: https://steelequivalents.com/materials/iso > 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 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 | |---|---|---|---|---| | [100](/materials/bs/100 "100") | [EN-JL1010](/materials/material-no/en-jl1010 "EN-JL1010") | Others | — | 16 | | [100Cr6](/materials/din-en/100cr6 "100Cr6") | [1.3505](/materials/material-no/1.3505 "1.3505") | Bearing steels | 0.93–1.05 | 22 | | [100Cr6](/materials/din-en/100cr6 "100Cr6") | [1.2067](/materials/material-no/1.2067 "1.2067") | Tool steels for cold work | 0.95–1.1 | 21 | | [100CrMnSi6-4](/materials/din-en/100crmnsi6-4 "100CrMnSi6-4") | [1.3520](/materials/material-no/1.3520 "1.3520") | Bearing steels | 0.93–1.05 | 16 | | [100CrMo7](/materials/din-en/100crmo7 "100CrMo7") | [1.3538](/materials/material-no/1.3538 "1.3538") | Others | 0.93–1.05 | 2 | | [100CrMo7](/materials/din-en/100crmo7 "100CrMo7") | [1.2303](/materials/material-no/1.2303 "1.2303") | Tool steels for cold work | 0.9–1.1 | 4 | | [100CrMo7](/materials/din-en/100crmo7 "100CrMo7") | [1.3537](/materials/material-no/1.3537 "1.3537") | Others | 0.93–1.05 | 4 | | [100CrMo7-4](/materials/din-en/100crmo7-4 "100CrMo7-4") | [1.3537](/materials/material-no/1.3537 "1.3537") | Others | 0.93–1.05 | 4 | | [100CrMo7-4](/materials/din-en/100crmo7-4 "100CrMo7-4") | [1.2303](/materials/material-no/1.2303 "1.2303") | Tool steels for cold work | 0.9–1.1 | 4 | | [100CrMo7-4](/materials/din-en/100crmo7-4 "100CrMo7-4") | [1.3538](/materials/material-no/1.3538 "1.3538") | Others | 0.93–1.05 | 2 | | [105WCr1](/materials/iso/105wcr1 "105WCr1") | [1.2419](/materials/material-no/1.2419 "1.2419") | Tool steels for cold work | 1–1.1 | 16 | | [11MnPb28](/materials/iso/11mnpb28 "11MnPb28") | [1.0718](/materials/material-no/1.0718 "1.0718") | Free cutting steels | ≤ 0.14 | 11 | | [13-5-2](/materials/iso/13-5-2 "13-5-2") | [1.4415](/materials/material-no/1.4415 "1.4415") | Others | ≤ 0.03 | 3 | | [14CrMo4-5](/materials/afnor/14crmo45 "14CrMo4-5") | [1.7336](/materials/material-no/1.7336 "1.7336") | Heat-resistant structural steels | ≤ 0.17 | 6 | | [14CrMo4-5](/materials/afnor/14crmo45 "14CrMo4-5") | [1.7335](/materials/material-no/1.7335 "1.7335") | Heat-resistant structural steels | 0.08–0.18 | 22 | | [150](/materials/bs/150 "150") | [EN-JL1020](/materials/material-no/en-jl1020 "EN-JL1020") | Others | — | 22 | | [15CrMo4](/materials/din-en/15crmo4 "15CrMo4") | [1.7243](/materials/material-no/1.7243 "1.7243") | Case hardening steels | 0.15–0.21 | 12 | | [15CrMo4](/materials/din-en/15crmo4 "15CrMo4") | [1.3566](/materials/material-no/1.3566 "1.3566") | Others | 0.12–0.18 | 8 | | [15NiCr13](/materials/din-en/15nicr13 "15NiCr13") | [1.5752](/materials/material-no/1.5752 "1.5752") | Case hardening steels | 0.14–0.2 | 15 | | [15NiCr13](/materials/din-en/15nicr13 "15NiCr13") | [1.5752](/materials/material-no/1.5752 "1.5752") | Case hardening steels | 0.14–0.2 | 15 | | [16MnCr5](/materials/din-en/16mncr5 "16MnCr5") | [1.7147](/materials/material-no/1.7147 "1.7147") | Case hardening steels | 0.17–0.22 | 15 | | [16MnCr5](/materials/din-en/16mncr5 "16MnCr5") | [1.7149](/materials/material-no/1.7149 "1.7149") | Case hardening steels | 0.17–0.22 | 8 | | [16MnCr5](/materials/din-en/16mncr5 "16MnCr5") | [1.2162](/materials/material-no/1.2162 "1.2162") | Tool steels for cold work | 0.18–0.24 | 7 | | [16MnCr5](/materials/din-en/16mncr5 "16MnCr5") | [1.7131](/materials/material-no/1.7131 "1.7131") | Case hardening steels | 0.14–0.19 | 24 | | [16MnCr5](/materials/din-en/16mncr5 "16MnCr5") | [1.7139](/materials/material-no/1.7139 "1.7139") | Case hardening steels | 0.14–0.19 | 11 | | [16MnCrS5](/materials/din-en/16mncrs5 "16MnCrS5") | [1.7131](/materials/material-no/1.7131 "1.7131") | Case hardening steels | 0.14–0.19 | 24 | | [16MnCrS5](/materials/din-en/16mncrs5 "16MnCrS5") | [1.7147](/materials/material-no/1.7147 "1.7147") | Case hardening steels | 0.17–0.22 | 15 | | [16MnCrS5](/materials/din-en/16mncrs5 "16MnCrS5") | [1.7149](/materials/material-no/1.7149 "1.7149") | Case hardening steels | 0.17–0.22 | 8 | | [16MnCrS5](/materials/din-en/16mncrs5 "16MnCrS5") | [1.2162](/materials/material-no/1.2162 "1.2162") | Tool steels for cold work | 0.18–0.24 | 7 | | [16MnCrS5](/materials/din-en/16mncrs5 "16MnCrS5") | [1.7139](/materials/material-no/1.7139 "1.7139") | Case hardening steels | 0.14–0.19 | 11 | | [17NiCrMo6](/materials/iso/17nicrmo6 "17NiCrMo6") | [1.6566](/materials/material-no/1.6566 "1.6566") | Case hardening steels | 0.14–0.2 | 7 | | [18CrMo4](/materials/din-en/18crmo4 "18CrMo4") | [1.7243](/materials/material-no/1.7243 "1.7243") | Case hardening steels | 0.15–0.21 | 12 | | [18CrMoS4](/materials/din-en/18crmos4 "18CrMoS4") | [1.7243](/materials/material-no/1.7243 "1.7243") | Case hardening steels | 0.15–0.21 | 12 | | [18CrMoS4](/materials/din-en/18crmos4 "18CrMoS4") | [1.7244](/materials/material-no/1.7244 "1.7244") | Case hardening steels | 0.15–0.21 | 2 | | [18CrNiMo7](/materials/iso/18crnimo7 "18CrNiMo7") | [1.6587](/materials/material-no/1.6587 "1.6587") | Case hardening steels | 0.15–0.21 | 15 | | [20-40](/materials/iso/20-40 "20-40") | [1.0416](/materials/material-no/1.0416 "1.0416") | Others | 0.15–0.2 | 17 | | [200](/materials/bs/200 "200") | [EN-JL1030](/materials/material-no/en-jl1030 "EN-JL1030") | Others | — | 22 | | [200-400](/materials/iso/200-400 "200-400") | [1.0416](/materials/material-no/1.0416 "1.0416") | Others | 0.15–0.2 | 17 | | [20Cr4](/materials/din-en/20cr4 "20Cr4") | [1.3523](/materials/material-no/1.3523 "1.3523") | Case hardening steels | 0.17–0.22 | 8 | | [20Cr4](/materials/din-en/20cr4 "20Cr4") | [1.7147](/materials/material-no/1.7147 "1.7147") | Case hardening steels | 0.17–0.22 | 15 | | [20Cr4](/materials/din-en/20cr4 "20Cr4") | [1.7027](/materials/material-no/1.7027 "1.7027") | Case hardening steels | 0.17–0.23 | 12 | | [20Cr4H](/materials/iso/20cr4h "20Cr4H") | [1.3523](/materials/material-no/1.3523 "1.3523") | Case hardening steels | 0.17–0.22 | 8 | | [20Cr4H](/materials/iso/20cr4h "20Cr4H") | [1.7147](/materials/material-no/1.7147 "1.7147") | Case hardening steels | 0.17–0.22 | 15 | | [20CrMo4](/materials/din-en/20crmo4 "20CrMo4") | [1.7218](/materials/material-no/1.7218 "1.7218") | Quenched and tempered steels | 0.22–0.29 | 25 | | [20CrMo4](/materials/din-en/20crmo4 "20CrMo4") | [1.3567](/materials/material-no/1.3567 "1.3567") | Others | 0.17–0.23 | 7 | | [20CrMo4](/materials/din-en/20crmo4 "20CrMo4") | — | — | 0.18–0.23 | 3 | | [20CrS4](/materials/din-en/20crs4 "20CrS4") | [1.3523](/materials/material-no/1.3523 "1.3523") | Case hardening steels | 0.17–0.22 | 8 | | [20CrS4](/materials/din-en/20crs4 "20CrS4") | [1.7147](/materials/material-no/1.7147 "1.7147") | Case hardening steels | 0.17–0.22 | 15 | | [20CrS4](/materials/din-en/20crs4 "20CrS4") | [1.7027](/materials/material-no/1.7027 "1.7027") | Case hardening steels | 0.17–0.23 | 12 | | [20MnCr5](/materials/din-en/20mncr5 "20MnCr5") | [1.7139](/materials/material-no/1.7139 "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. Page 1 of 11[Next](/materials/iso/page/2 "Next")