--- title: "ISO steel grades — 531 designations — Page 10" 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/10 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/iso/page/10.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: sha256:8300bd3707c87c359dcab57a4a97131344c7544c2141fe2451a87a2ce598be02 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/10 > Canonical URL: https://steelequivalents.com/materials/iso/page/10 > 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 10 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 | |---|---|---|---|---| | [P290](/materials/iso/p290 "P290") | [1.0481](/materials/material-no/1.0481 "1.0481") | Heat-resistant structural steels | 0.08–0.2 | 17 | | [P3](/materials/iso/p3 "P3") | [1.0345](/materials/material-no/1.0345 "1.0345") | Heat-resistant structural steels | ≤ 0.16 | 18 | | [P32](/materials/iso/p32 "P32") | [1.7335](/materials/material-no/1.7335 "1.7335") | Heat-resistant structural steels | 0.08–0.18 | 22 | | [P34](/materials/iso/p34 "P34") | [1.7380](/materials/material-no/1.7380 "1.7380") | Heat-resistant structural steels | 0.08–0.14 | 20 | | [S10C](/materials/jis/s10c "S10C") | [1.1121](/materials/material-no/1.1121 "1.1121") | Case hardening steels | 0.07–0.13 | 22 | | [SNi6601](/materials/iso/sni6601 "SNi6601") | [2.4851](/materials/material-no/2.4851 "2.4851") | Heat resistant steels | 0.03–0.1 | 7 | | [stop odlewany](/materials/iso/stop-odlewany "stop odlewany") | [2.4066](/materials/material-no/2.4066 "2.4066") | Nickel and cobalt alloys | ≤ 0.1 | 10 | | [stop odlewany](/materials/iso/stop-odlewany "stop odlewany") | [2.4068](/materials/material-no/2.4068 "2.4068") | Nickel and cobalt alloys | ≤ 0.02 | 8 | | [TC105](/materials/iso/tc105 "TC105") | [1.1645](/materials/material-no/1.1645 "1.1645") | Unalloyed tool steels / carbon steels | 1–1.1 | 18 | | [TC105](/materials/iso/tc105 "TC105") | [1.1535](/materials/material-no/1.1535 "1.1535") | Unalloyed tool steels / carbon steels | 0.85–0.95 | 14 | | [TC120](/materials/iso/tc120 "TC120") | — | — | 1.15–1.24 | 7 | | [TC80](/materials/iso/tc80 "TC80") | [1.1525](/materials/material-no/1.1525 "1.1525") | Unalloyed tool steels / carbon steels | 0.75–0.85 | 20 | | [TC90](/materials/iso/tc90 "TC90") | — | — | 0.85–0.94 | 4 | | [TS26](/materials/iso/ts26 "TS26") | [1.5415](/materials/material-no/1.5415 "1.5415") | Heat-resistant structural steels | 0.12–0.2 | 15 | | [TS34](/materials/iso/ts34 "TS34") | [1.7380](/materials/material-no/1.7380 "1.7380") | Heat-resistant structural steels | 0.08–0.14 | 20 | | [Type19](/materials/iso/type19 "Type19") | [1.4404](/materials/material-no/1.4404 "1.4404") | Stainless steels | ≤ 0.03 | 25 | | [Type19a](/materials/iso/type19a "Type19a") | [1.4435](/materials/material-no/1.4435 "1.4435") | Stainless steels | ≤ 0.03 | 20 | | [Type20a](/materials/iso/type20a "Type20a") | [1.4436](/materials/material-no/1.4436 "1.4436") | Stainless steels | ≤ 0.05 | 19 | | [Type9](/materials/iso/type9 "Type9") | [1.4871](/materials/material-no/1.4871 "1.4871") | Valve steels | 0.48–0.58 | 17 | | [X100CrMoV5](/materials/din-en/x100crmov5 "X100CrMoV5") | [1.2363](/materials/material-no/1.2363 "1.2363") | Tool steels for cold work | 0.95–1.05 | 16 | | [X100CrMoV5-1](/materials/din-en/x100crmov5-1 "X100CrMoV5-1") | [1.2363](/materials/material-no/1.2363 "1.2363") | Tool steels for cold work | 0.95–1.05 | 16 | | [X108CrMo17](/materials/din-en/x108crmo17 "X108CrMo17") | [1.4125](/materials/material-no/1.4125 "1.4125") | Stainless steels | 0.95–1.2 | 11 | | [X108CrMo17](/materials/din-en/x108crmo17 "X108CrMo17") | [1.4112](/materials/material-no/1.4112 "1.4112") | Stainless steels | 0.85–0.95 | 13 | | [X108CrMo17](/materials/din-en/x108crmo17 "X108CrMo17") | [1.4528](/materials/material-no/1.4528 "1.4528") | Stainless steels | 1–1.1 | 5 | | [X108CrMo17](/materials/din-en/x108crmo17 "X108CrMo17") | [1.4109](/materials/material-no/1.4109 "1.4109") | Stainless steels | 0.6–0.75 | 10 | | [X108CrMo17](/materials/din-en/x108crmo17 "X108CrMo17") | [1.3543](/materials/material-no/1.3543 "1.3543") | Bearing steels | 0.95–1.2 | 6 | | [X12Cr13E](/materials/iso/x12cr13e "X12Cr13E") | [1.4006](/materials/material-no/1.4006 "1.4006") | Stainless steels | 0.08–0.15 | 26 | | [X12Cr13E](/materials/iso/x12cr13e "X12Cr13E") | [1.4005](/materials/material-no/1.4005 "1.4005") | Stainless steels | 0.08–0.15 | 14 | | [X12Cr13E](/materials/iso/x12cr13e "X12Cr13E") | [1.4024](/materials/material-no/1.4024 "1.4024") | Stainless steels | 0.12–0.17 | 13 | | [X12CrMnNiN18-9-5](/materials/din-en/x12crmnnin18-9-5 "X12CrMnNiN18-9-5") | [1.4372](/materials/material-no/1.4372 "1.4372") | Others | ≤ 0.15 | 10 | | [X12CrMnNiN18-9-5](/materials/din-en/x12crmnnin18-9-5 "X12CrMnNiN18-9-5") | [1.4373](/materials/material-no/1.4373 "1.4373") | Non-magnetic steels | ≤ 0.15 | 13 | | [X153CrMoV12](/materials/din-en/x153crmov12 "X153CrMoV12") | [1.2601](/materials/material-no/1.2601 "1.2601") | Tool steels for cold work | 1.55–1.75 | 15 | | [X153CrMoV12](/materials/din-en/x153crmov12 "X153CrMoV12") | [1.2880](/materials/material-no/1.2880 "1.2880") | Tool steels for cold work | 1.55–1.75 | 8 | | [X153CrMoV12](/materials/din-en/x153crmov12 "X153CrMoV12") | [1.2880](/materials/material-no/1.2880 "1.2880") | Others | 1.55–1.75 | 8 | | [X153CrMoV12](/materials/din-en/x153crmov12 "X153CrMoV12") | [1.2379](/materials/material-no/1.2379 "1.2379") | Tool steels for cold work | 1.45–1.6 | 20 | | [X15CrN26](/materials/din-en/x15crn26 "X15CrN26") | [1.4749](/materials/material-no/1.4749 "1.4749") | Heat resistant steels | 0.15–0.2 | 10 | | [X160CrMoV12-1](/materials/iso/x160crmov12-1 "X160CrMoV12-1") | [1.2379](/materials/material-no/1.2379 "1.2379") | Tool steels for cold work | 1.45–1.6 | 20 | | [X160CrMoV12-1](/materials/iso/x160crmov12-1 "X160CrMoV12-1") | [1.2601](/materials/material-no/1.2601 "1.2601") | Tool steels for cold work | 1.55–1.75 | 15 | | [X160CrMoV12-1](/materials/iso/x160crmov12-1 "X160CrMoV12-1") | [1.2880](/materials/material-no/1.2880 "1.2880") | Tool steels for cold work | 1.55–1.75 | 8 | | [X160CrMoV12-1](/materials/iso/x160crmov12-1 "X160CrMoV12-1") | [1.2880](/materials/material-no/1.2880 "1.2880") | Others | 1.55–1.75 | 8 | | [X18CrMnMoNbVN12](/materials/din-en/x18crmnmonbvn12 "X18CrMnMoNbVN12") | [1.4913](/materials/material-no/1.4913 "1.4913") | High-temperature steels | 0.17–0.23 | 3 | | [X18CrMnMoNbVN12](/materials/din-en/x18crmnmonbvn12 "X18CrMnMoNbVN12") | [1.4916](/materials/material-no/1.4916 "1.4916") | Others | 0.15–0.2 | 3 | | [X20CrMoNV11-1-1](/materials/iso/x20crmonv11-1-1 "X20CrMoNV11-1-1") | [1.4922](/materials/material-no/1.4922 "1.4922") | High-temperature steels | 0.17–0.23 | 7 | | [X210Cr12](/materials/din-en/x210cr12 "X210Cr12") | [1.2436](/materials/material-no/1.2436 "1.2436") | Tool steels for cold work | 2–2.3 | 16 | | [X210Cr12](/materials/din-en/x210cr12 "X210Cr12") | [1.2080](/materials/material-no/1.2080 "1.2080") | Tool steels for cold work | 1.9–2.2 | 18 | | [X210CrW12](/materials/din-en/x210crw12 "X210CrW12") | [1.2080](/materials/material-no/1.2080 "1.2080") | Tool steels for cold work | 1.9–2.2 | 18 | | [X210CrW12](/materials/din-en/x210crw12 "X210CrW12") | [1.2436](/materials/material-no/1.2436 "1.2436") | Tool steels for cold work | 2–2.3 | 16 | | [X2CrCuTiNb18](/materials/iso/x2crcutinb18 "X2CrCuTiNb18") | [1.4509](/materials/material-no/1.4509 "1.4509") | Stainless steels | ≤ 0.03 | 4 | | [X30WCrV5-3](/materials/din-en/x30wcrv5-3 "X30WCrV5-3") | [1.2567](/materials/material-no/1.2567 "1.2567") | Tool steels for hot work | 0.25–0.35 | 9 | | [X30WCrV9-3](/materials/din-en/x30wcrv9-3 "X30WCrV9-3") | [1.2581](/materials/material-no/1.2581 "1.2581") | Tool steels for hot work | 0.25–0.35 | 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/9 "Previous") Page 10 of 11[Next](/materials/iso/page/11 "Next")