--- title: "ISO steel grades — 531 designations — Page 6" 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/6 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/iso/page/6.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:e807f4b55c8878d8e5abe1646963d5f95f53c4e57a25aebbf425fdbacdc4cb0f generated: 2026-09-25 --- > **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/6 > Canonical URL: https://steelequivalents.com/materials/iso/page/6 > 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 6 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 | |---|---|---|---|---| | [C60](/materials/din-en/c60 "C60") | [1.0601](/materials/material-no/1.0601 "1.0601") | Quenched and tempered steels | 0.57–0.65 | 25 | | [C60 C60E4 C60M2](/materials/iso/c60-c60e4-c60m2 "C60 C60E4 C60M2") | [1.1212](/materials/material-no/1.1212 "1.1212") | Others | 0.56–0.6 | 5 | | [C60 C60E4 C60M2](/materials/iso/c60-c60e4-c60m2 "C60 C60E4 C60M2") | [1.1228](/materials/material-no/1.1228 "1.1228") | Others | 0.58–0.62 | 5 | | [C60 C60E4 C60M2](/materials/iso/c60-c60e4-c60m2 "C60 C60E4 C60M2") | — | — | — | 3 | | [C60E4](/materials/iso/c60e4 "C60E4") | [1.1221](/materials/material-no/1.1221 "1.1221") | Quenched and tempered steels | 0.57–0.65 | 18 | | [C60M2](/materials/iso/c60m2 "C60M2") | [1.1223](/materials/material-no/1.1223 "1.1223") | Quenched and tempered steels | 0.57–0.65 | 4 | | [C70U](/materials/din-en/c70u "C70U") | [1.1620](/materials/material-no/1.1620 "1.1620") | Unalloyed tool steels / carbon steels | 0.65–0.74 | 14 | | [C70U](/materials/din-en/c70u "C70U") | [1.1520](/materials/material-no/1.1520 "1.1520") | Unalloyed tool steels / carbon steels | 0.65–0.75 | 11 | | [C70W1](/materials/din-en/c70w1 "C70W1") | [1.1620](/materials/material-no/1.1620 "1.1620") | Unalloyed tool steels / carbon steels | 0.65–0.74 | 14 | | [C70W1](/materials/din-en/c70w1 "C70W1") | [1.1520](/materials/material-no/1.1520 "1.1520") | Unalloyed tool steels / carbon steels | 0.65–0.75 | 11 | | [C80U](/materials/din-en/c80u "C80U") | [1.1625](/materials/material-no/1.1625 "1.1625") | Unalloyed tool steels / carbon steels | 0.75–0.85 | 15 | | [C80U](/materials/din-en/c80u "C80U") | [1.1525](/materials/material-no/1.1525 "1.1525") | Unalloyed tool steels / carbon steels | 0.75–0.85 | 20 | | [C90U](/materials/din-en/c90u "C90U") | [1.1830](/materials/material-no/1.1830 "1.1830") | Unalloyed tool steels / carbon steels | 0.8–0.9 | 10 | | [C90U](/materials/din-en/c90u "C90U") | [1.1535](/materials/material-no/1.1535 "1.1535") | Unalloyed tool steels / carbon steels | 0.85–0.95 | 14 | | [CC21A](/materials/iso/cc21a "CC21A") | — | — | 0.18–0.23 | 5 | | [CC8A](/materials/iso/cc8a "CC8A") | — | — | 0.08–0.13 | 5 | | [CE20BG2](/materials/iso/ce20bg2 "CE20BG2") | — | — | 0.14–0.2 | 3 | | [Cr01](/materials/iso/cr01 "Cr01") | [1.0330](/materials/material-no/1.0330 "1.0330") | Unalloyed structural steels | ≤ 0.12 | 17 | | [Cr04](/materials/iso/cr04 "Cr04") | [1.0338](/materials/material-no/1.0338 "1.0338") | Unalloyed structural steels | ≤ 0.08 | 18 | | [CR22](/materials/iso/cr22 "CR22") | [1.0330](/materials/material-no/1.0330 "1.0330") | Unalloyed structural steels | ≤ 0.12 | 17 | | [CR24](/materials/iso/cr24 "CR24") | [1.0338](/materials/material-no/1.0338 "1.0338") | Unalloyed structural steels | ≤ 0.08 | 18 | | [CrNiMo13-5-2](/materials/iso/crnimo13-5-2 "CrNiMo13-5-2") | [1.4415](/materials/material-no/1.4415 "1.4415") | Others | ≤ 0.03 | 3 | | [CrNiMo22-5-3](/materials/iso/crnimo22-5-3 "CrNiMo22-5-3") | [1.4462](/materials/material-no/1.4462 "1.4462") | Stainless steels | ≤ 0.03 | 13 | | [CrNiMo25-7-4](/materials/iso/crnimo25-7-4 "CrNiMo25-7-4") | [1.4501](/materials/material-no/1.4501 "1.4501") | Stainless steels | ≤ 0.03 | 8 | | [CrNiMo25-7-4](/materials/iso/crnimo25-7-4 "CrNiMo25-7-4") | [1.4410](/materials/material-no/1.4410 "1.4410") | Stainless steels | ≤ 0.03 | 9 | | [CS65](/materials/iso/cs65 "CS65") | [1.1231](/materials/material-no/1.1231 "1.1231") | Spring steels | 0.65–0.73 | 18 | | [CS65](/materials/iso/cs65 "CS65") | [1.1234](/materials/material-no/1.1234 "1.1234") | Others | 0.6–0.75 | 9 | | [CS65](/materials/iso/cs65 "CS65") | [1.0603](/materials/material-no/1.0603 "1.0603") | Spring steels | 0.65–0.72 | 10 | | [CS65](/materials/iso/cs65 "CS65") | [1.2007](/materials/material-no/1.2007 "1.2007") | Tool steels for cold work | 0.65–0.7 | 8 | | [CS85](/materials/iso/cs85 "CS85") | [1.1269](/materials/material-no/1.1269 "1.1269") | Spring steels | 0.8–0.9 | 14 | | [CS85](/materials/iso/cs85 "CS85") | [1.2004](/materials/material-no/1.2004 "1.2004") | Tool steels for cold work | 0.8–0.9 | 8 | | [CS95](/materials/bs/cs95 "CS95") | [1.1274](/materials/material-no/1.1274 "1.1274") | Spring steels | 0.95–1.05 | 13 | | [CT105](/materials/iso/ct105 "CT105") | [1.1545](/materials/material-no/1.1545 "1.1545") | Unalloyed tool steels / carbon steels | 1–1.1 | 19 | | [CT105](/materials/iso/ct105 "CT105") | [1.1645](/materials/material-no/1.1645 "1.1645") | Unalloyed tool steels / carbon steels | 1–1.1 | 18 | | [D26](/materials/iso/d26 "D26") | [1.4567](/materials/material-no/1.4567 "1.4567") | Stainless steels | ≤ 0.04 | 8 | | [E185](/materials/iso/e185 "E185") | [1.0035](/materials/material-no/1.0035 "1.0035") | Unalloyed structural steels | — | 22 | | [E235-A](/materials/iso/e235-a "E235-A") | [1.0036](/materials/material-no/1.0036 "1.0036") | Unalloyed structural steels | ≤ 0.17 | 20 | | [E235-A](/materials/iso/e235-a "E235-A") | [1.0036](/materials/material-no/1.0036 "1.0036") | Unalloyed structural steels | ≤ 0.17 | 19 | | [E235-B](/materials/iso/e235-b "E235-B") | [1.0038](/materials/material-no/1.0038 "1.0038") | Unalloyed structural steels | ≤ 0.17 | 26 | | [E235-B](/materials/iso/e235-b "E235-B") | [1.0486](/materials/material-no/1.0486 "1.0486") | Fine-grain structural steels | ≤ 0.16 | 6 | | [E235-C](/materials/iso/e235c "E235-C") | [1.0038](/materials/material-no/1.0038 "1.0038") | Unalloyed structural steels | ≤ 0.17 | 26 | | [E235-C](/materials/iso/e235c "E235-C") | [1.0461](/materials/material-no/1.0461 "1.0461") | Fine-grain structural steels | ≤ 0.18 | 5 | | [E235-D](/materials/iso/e235-d "E235-D") | [1.0461](/materials/material-no/1.0461 "1.0461") | Fine-grain structural steels | ≤ 0.18 | 5 | | [E235C](/materials/iso/e235c "E235C") | [1.0114](/materials/material-no/1.0114 "1.0114") | Unalloyed structural steels | ≤ 0.17 | 21 | | [E275-A](/materials/is/e275-a "E275-A") | [1.0144](/materials/material-no/1.0144 "1.0144") | Unalloyed structural steels | ≤ 0.18 | 22 | | [E275-C](/materials/is/e275c "E275-C") | [1.0044](/materials/material-no/1.0044 "1.0044") | Unalloyed structural steels | ≤ 0.21 | 26 | | [E275-D](/materials/iso/e275-d "E275-D") | [1.0044](/materials/material-no/1.0044 "1.0044") | Unalloyed structural steels | ≤ 0.21 | 26 | | [E275B](/materials/iso/e275b "E275B") | [1.0044](/materials/material-no/1.0044 "1.0044") | Unalloyed structural steels | ≤ 0.21 | 26 | | [E275C](/materials/is/e275c "E275C") | [1.0143](/materials/material-no/1.0143 "1.0143") | Unalloyed structural steels | ≤ 0.18 | 16 | | [E355](/materials/din-en/e355 "E355") | [1.0562](/materials/material-no/1.0562 "1.0562") | Fine-grain structural steels | ≤ 0.18 | 18 | **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/5 "Previous") Page 6 of 11[Next](/materials/iso/page/7 "Next")