--- title: "ISO steel grades — 531 designations — Page 7" 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/7 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/iso/page/7.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: sha256:547a2efa9a2926680ba8244e7865a304fc38e77954bf2d4f8010449f2dc76fe0 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/7 > Canonical URL: https://steelequivalents.com/materials/iso/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. ISO · 531 grades # ISO steel grades — 531 designations — Page 7 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 | |---|---|---|---|---| | [E355-C](/materials/afnor/e355c "E355-C") | [1.0050](/materials/material-no/1.0050 "1.0050") | Unalloyed structural steels | — | 23 | | [E355-C](/materials/afnor/e355c "E355-C") | [1.0050](/materials/material-no/1.0050 "1.0050") | Unalloyed structural steels | — | 23 | | [E355C](/materials/afnor/e355c "E355C") | [1.0553](/materials/material-no/1.0553 "1.0553") | Unalloyed structural steels | ≤ 0.2 | 20 | | [E355C](/materials/afnor/e355c "E355C") | [1.0045](/materials/material-no/1.0045 "1.0045") | Unalloyed structural steels | ≤ 0.24 | 17 | | [E355E](/materials/iso/e355e "E355E") | [1.0566](/materials/material-no/1.0566 "1.0566") | Fine-grain structural steels | ≤ 0.18 | 11 | | [E420](/materials/din-en/e420 "E420") | [1.8902](/materials/material-no/1.8902 "1.8902") | Fine-grain structural steels | ≤ 0.2 | 19 | | [E460](/materials/iso/e460 "E460") | [1.8901](/materials/material-no/1.8901 "1.8901") | Fine-grain structural steels | ≤ 0.2 | 7 | | [E460](/materials/iso/e460 "E460") | [1.8906](/materials/material-no/1.8906 "1.8906") | Others | ≤ 0.2 | 3 | | [E500](/materials/iso/e500 "E500") | [1.8909](/materials/material-no/1.8909 "1.8909") | Others | ≤ 0.2 | 3 | | [E550](/materials/iso/e550 "E550") | [1.8926](/materials/material-no/1.8926 "1.8926") | Others | ≤ 0.2 | 2 | | [E620](/materials/iso/e620 "E620") | [1.8927](/materials/material-no/1.8927 "1.8927") | Others | ≤ 0.2 | 2 | | [E690](/materials/iso/e690 "E690") | [1.8928](/materials/material-no/1.8928 "1.8928") | High-strength steels | ≤ 0.2 | 7 | | [ENi6025](/materials/iso/eni6025 "ENi6025") | [2.4633](/materials/material-no/2.4633 "2.4633") | Nickel and cobalt alloys | 0.15–0.25 | 3 | | [F26](/materials/iso/f26 "F26") | [1.5415](/materials/material-no/1.5415 "1.5415") | Heat-resistant structural steels | 0.12–0.2 | 15 | | [F32](/materials/iso/f32 "F32") | [1.7335](/materials/material-no/1.7335 "1.7335") | Heat-resistant structural steels | 0.08–0.18 | 22 | | [F34](/materials/iso/f34 "F34") | [1.7380](/materials/material-no/1.7380 "1.7380") | Heat-resistant structural steels | 0.08–0.14 | 20 | | [F5](/materials/iso/f5 "F5") | [1.0425](/materials/material-no/1.0425 "1.0425") | Heat-resistant structural steels | ≤ 0.2 | 20 | | [F7](/materials/iso/f7 "F7") | [1.0425](/materials/material-no/1.0425 "1.0425") | Heat-resistant structural steels | ≤ 0.2 | 20 | | [Fe310](/materials/iso/fe310 "Fe310") | [1.0035](/materials/material-no/1.0035 "1.0035") | Unalloyed structural steels | — | 22 | | [Fe355W](/materials/iso/fe355w "Fe355W") | [1.8959](/materials/material-no/1.8959 "1.8959") | Weathering steels | ≤ 0.16 | 10 | | [Fe355W-1A](/materials/iso/fe355w-1a "Fe355W-1A") | [1.8945](/materials/material-no/1.8945 "1.8945") | Weathering steels | ≤ 0.12 | 16 | | [Fe360-A](/materials/iso/fe360-a "Fe360-A") | [1.0036](/materials/material-no/1.0036 "1.0036") | Unalloyed structural steels | ≤ 0.17 | 20 | | [Fe360-A](/materials/iso/fe360-a "Fe360-A") | [1.0036](/materials/material-no/1.0036 "1.0036") | Unalloyed structural steels | ≤ 0.17 | 19 | | [Fe360-B](/materials/une/fe360b "Fe360-B") | [1.0486](/materials/material-no/1.0486 "1.0486") | Fine-grain structural steels | ≤ 0.16 | 6 | | [Fe360-C](/materials/iso/fe360c "Fe360-C") | [1.0461](/materials/material-no/1.0461 "1.0461") | Fine-grain structural steels | ≤ 0.18 | 5 | | [Fe360-C](/materials/iso/fe360c "Fe360-C") | [1.0038](/materials/material-no/1.0038 "1.0038") | Unalloyed structural steels | ≤ 0.17 | 26 | | [Fe360-D](/materials/uni/fe360d "Fe360-D") | [1.0461](/materials/material-no/1.0461 "1.0461") | Fine-grain structural steels | ≤ 0.18 | 5 | | [Fe360B](/materials/une/fe360b "Fe360B") | [1.0038](/materials/material-no/1.0038 "1.0038") | Unalloyed structural steels | ≤ 0.17 | 26 | | [Fe430-A](/materials/iso/fe430-a "Fe430-A") | [1.0144](/materials/material-no/1.0144 "1.0144") | Unalloyed structural steels | ≤ 0.18 | 22 | | [Fe430-B](/materials/iso/fe430b "Fe430-B") | [1.0044](/materials/material-no/1.0044 "1.0044") | Unalloyed structural steels | ≤ 0.21 | 26 | | [Fe430-C](/materials/iso/fe430c "Fe430-C") | [1.0044](/materials/material-no/1.0044 "1.0044") | Unalloyed structural steels | ≤ 0.21 | 26 | | [Fe430-D](/materials/uni/fe430d "Fe430-D") | [1.0044](/materials/material-no/1.0044 "1.0044") | Unalloyed structural steels | ≤ 0.21 | 26 | | [Fe430D](/materials/uni/fe430d "Fe430D") | [1.0144](/materials/material-no/1.0144 "1.0144") | Unalloyed structural steels | ≤ 0.18 | 22 | | [Fe490](/materials/iso/fe490 "Fe490") | [1.0050](/materials/material-no/1.0050 "1.0050") | Unalloyed structural steels | — | 23 | | [Fe490](/materials/iso/fe490 "Fe490") | [1.0050](/materials/material-no/1.0050 "1.0050") | Unalloyed structural steels | — | 23 | | [Fe510-C](/materials/uni/fe510c "Fe510-C") | [1.0050](/materials/material-no/1.0050 "1.0050") | Unalloyed structural steels | — | 23 | | [Fe510-C](/materials/uni/fe510c "Fe510-C") | [1.0050](/materials/material-no/1.0050 "1.0050") | Unalloyed structural steels | — | 23 | | [Fe510B](/materials/uni/fe510b "Fe510B") | [1.0045](/materials/material-no/1.0045 "1.0045") | Unalloyed structural steels | ≤ 0.24 | 17 | | [Fe510C](/materials/uni/fe510c "Fe510C") | [1.0553](/materials/material-no/1.0553 "1.0553") | Unalloyed structural steels | ≤ 0.2 | 20 | | [Fe590](/materials/uni/fe590 "Fe590") | [1.0580](/materials/material-no/1.0580 "1.0580") | Unalloyed structural steels | ≤ 0.22 | 10 | | [Fe590](/materials/uni/fe590 "Fe590") | [1.0060](/materials/material-no/1.0060 "1.0060") | Unalloyed structural steels | — | 21 | | [Fe590](/materials/uni/fe590 "Fe590") | [1.0060](/materials/material-no/1.0060 "1.0060") | Unalloyed structural steels | — | 21 | | [Fe690](/materials/uni/fe690 "Fe690") | [1.0070](/materials/material-no/1.0070 "1.0070") | Unalloyed structural steels | — | 16 | | [Fe690](/materials/uni/fe690 "Fe690") | [1.0070](/materials/material-no/1.0070 "1.0070") | Unalloyed structural steels | — | 16 | | [FeE355](/materials/iso/fee355 "FeE355") | [1.0976](/materials/material-no/1.0976 "1.0976") | Fine-grain steels for cold forming | ≤ 0.12 | 9 | | [FeE420](/materials/uni/fee420 "FeE420") | [1.0980](/materials/material-no/1.0980 "1.0980") | Fine-grain steels for cold forming | ≤ 0.12 | 8 | | [FeE490](/materials/iso/fee490 "FeE490") | [1.0984](/materials/material-no/1.0984 "1.0984") | Fine-grain steels for cold forming | ≤ 0.12 | 6 | | [FeE560](/materials/iso/fee560 "FeE560") | [1.0986](/materials/material-no/1.0986 "1.0986") | Fine-grain steels for cold forming | ≤ 0.12 | 6 | | [FeE690](/materials/iso/fee690 "FeE690") | [1.0060](/materials/material-no/1.0060 "1.0060") | Unalloyed structural steels | — | 21 | | [FeE690](/materials/iso/fee690 "FeE690") | [1.0060](/materials/material-no/1.0060 "1.0060") | Unalloyed structural steels | — | 21 | **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/6 "Previous") Page 7 of 11[Next](/materials/iso/page/8 "Next")