--- title: "UNI steel grades — 671 designations — Page 13" description: "Steel grades designated under UNI, with chemical composition, mechanical properties and equivalents in other standards. 671 designations across 331…" canonical: https://steelequivalents.com/materials/uni/page/13 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/uni/page/13.md cs: https://steelequivalents.com/cs/materiály/uni.md de: https://steelequivalents.com/de/werkstoffe/uni.md es: https://steelequivalents.com/es/materiales/uni.md fr: https://steelequivalents.com/fr/matériaux/uni.md hu: https://steelequivalents.com/hu/anyagok/uni.md it: https://steelequivalents.com/it/materiali/uni.md nl: https://steelequivalents.com/nl/materialen/uni.md pl: https://steelequivalents.com/pl/materiały/uni.md pt: https://steelequivalents.com/pt/materiais/uni.md ru: https://steelequivalents.com/ru/материалы/uni.md tr: https://steelequivalents.com/tr/malzemeler/uni.md zh: https://steelequivalents.com/zh/材料/uni.md ja: https://steelequivalents.com/ja/材料/uni.md ar: https://steelequivalents.com/ar/المواد/uni.md ko: https://steelequivalents.com/ko/재료/uni.md pt-br: https://steelequivalents.com/pt-br/materiais/uni.md hi: https://steelequivalents.com/hi/सामग्री/uni.md content_hash: sha256:ad3f4f40af0b132c0036746e72221f942acd83324c6c5a0e791052e596012032 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/uni/page/13 > Canonical URL: https://steelequivalents.com/materials/uni/page/13 > 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. UNI · 671 grades # UNI steel grades — 671 designations — Page 13 Every grade designated under UNI, 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 671 designations | Grade | Material no. | Category | C% by weight | Also in other standards | |---|---|---|---|---| | [X2CrNiN1811](/materials/din-en/x2crnin18-11 "X2CrNiN1811") | [1.4311](/materials/material-no/1.4311 "1.4311") | Stainless steels | ≤ 0.03 | 13 | | [X2CrTi12](/materials/din-en/x2crti12 "X2CrTi12") | [1.4512](/materials/material-no/1.4512 "1.4512") | Stainless steels | ≤ 0.03 | 10 | | [X30Cr13](/materials/is/x30cr13 "X30Cr13") | [1.4028](/materials/material-no/1.4028 "1.4028") | Stainless steels | 0.26–0.35 | 18 | | [X30WCrV5-3KU](/materials/uni/x30wcrv5-3ku "X30WCrV5-3KU") | [1.2567](/materials/material-no/1.2567 "1.2567") | Tool steels for hot work | 0.25–0.35 | 9 | | [X30WCrV9-3KU](/materials/uni/x30wcrv9-3ku "X30WCrV9-3KU") | [1.2581](/materials/material-no/1.2581 "1.2581") | Tool steels for hot work | 0.25–0.35 | 18 | | [X35CrMoV05KU](/materials/uni/x35crmov05ku "X35CrMoV05KU") | [1.2344](/materials/material-no/1.2344 "1.2344") | Tool steels for hot work | 0.35–0.42 | 20 | | [X37CrMoV5-1KU](/materials/afnor/x37crmov5-1ku "X37CrMoV5-1KU") | [1.2343](/materials/material-no/1.2343 "1.2343") | Tool steels for hot work | 0.33–0.41 | 20 | | [X3CrNi18-10](/materials/uni/x3crni18-10 "X3CrNi18-10") | [1.4301](/materials/material-no/1.4301 "1.4301") | Stainless steels | ≤ 0.07 | 23 | | [X3CrNi18-11](/materials/uni/x3crni18-11 "X3CrNi18-11") | [1.4306](/materials/material-no/1.4306 "1.4306") | Stainless steels | ≤ 0.03 | 18 | | [X3CrTi17](/materials/din-en/x3crti17 "X3CrTi17") | [1.4510](/materials/material-no/1.4510 "1.4510") | Stainless steels | ≤ 0.05 | 14 | | [X40Cr14](/materials/din-en/x40cr14 "X40Cr14") | [1.4031](/materials/material-no/1.4031 "1.4031") | Stainless steels | 0.36–0.42 | 18 | | [X40Cr14](/materials/din-en/x40cr14 "X40Cr14") | [1.4034](/materials/material-no/1.4034 "1.4034") | Stainless steels | 0.43–0.5 | 18 | | [X40Cr14](/materials/din-en/x40cr14 "X40Cr14") | [1.2083](/materials/material-no/1.2083 "1.2083") | Tool steels for cold work | 0.36–0.42 | 16 | | [X40CrMoV51KU](/materials/uni/x40crmov51ku "X40CrMoV51KU") | [1.2344](/materials/material-no/1.2344 "1.2344") | Tool steels for hot work | 0.35–0.42 | 20 | | [X41Cr13KU](/materials/uni/x41cr13ku "X41Cr13KU") | [1.4031](/materials/material-no/1.4031 "1.4031") | Stainless steels | 0.36–0.42 | 18 | | [X45CrSi8](/materials/uni/x45crsi8 "X45CrSi8") | [1.4718](/materials/material-no/1.4718 "1.4718") | Valve steels | 0.4–0.5 | 16 | | [X45CrSi8](/materials/uni/x45crsi8 "X45CrSi8") | [1.4718](/materials/material-no/1.4718 "1.4718") | Others | 0.4–0.5 | 16 | | [X46Cr13](/materials/din-en/x46cr13 "X46Cr13") | [1.4031](/materials/material-no/1.4031 "1.4031") | Stainless steels | 0.36–0.42 | 18 | | [X53CrMnNiN21-9](/materials/din-en/x53crmnnin21-9 "X53CrMnNiN21-9") | [1.4871](/materials/material-no/1.4871 "1.4871") | Valve steels | 0.48–0.58 | 17 | | [X5CrNi18-10](/materials/din-en/x5crni18-10 "X5CrNi18-10") | [1.4301](/materials/material-no/1.4301 "1.4301") | Stainless steels | ≤ 0.07 | 23 | | [X5CrNiMo17-12](/materials/uni/x5crnimo17-12 "X5CrNiMo17-12") | [1.4401](/materials/material-no/1.4401 "1.4401") | Stainless steels | ≤ 0.07 | 20 | | [X5CrNiMo17-13](/materials/uni/x5crnimo17-13 "X5CrNiMo17-13") | [1.4436](/materials/material-no/1.4436 "1.4436") | Stainless steels | ≤ 0.05 | 19 | | [X6 Cr 13](/materials/din-en/x6cr13 "X6 Cr 13") | — | — | — | 2 | | [X6CM3](/materials/uni/x6cm3 "X6CM3") | [1.4000](/materials/material-no/1.4000 "1.4000") | Stainless steels | ≤ 0.08 | 16 | | [X6Cr13](/materials/din-en/x6cr13 "X6Cr13") | [1.4000](/materials/material-no/1.4000 "1.4000") | Stainless steels | ≤ 0.08 | 16 | | [X6Cr17](/materials/din-en/x6cr17 "X6Cr17") | [1.4016](/materials/material-no/1.4016 "1.4016") | Stainless steels | ≤ 0.08 | 18 | | [X6CrAl13](/materials/din-en/x6cral13 "X6CrAl13") | [1.4003](/materials/material-no/1.4003 "1.4003") | Stainless steels | ≤ 0.03 | 6 | | [X6CrAl13](/materials/din-en/x6cral13 "X6CrAl13") | [1.4002](/materials/material-no/1.4002 "1.4002") | Stainless steels | ≤ 0.08 | 13 | | [X6CrNb17](/materials/din-en/x6crnb17 "X6CrNb17") | [1.4510](/materials/material-no/1.4510 "1.4510") | Stainless steels | ≤ 0.05 | 14 | | [X6CrNb17](/materials/din-en/x6crnb17 "X6CrNb17") | [1.4511](/materials/material-no/1.4511 "1.4511") | Stainless steels | ≤ 0.05 | 11 | | [X6CrNi2314](/materials/iso/x6crni23-14 "X6CrNi2314") | [1.4833](/materials/material-no/1.4833 "1.4833") | Heat resistant steels | ≤ 0.15 | 15 | | [X6CrNi25-20](/materials/din-en/x6crni25-20 "X6CrNi25-20") | [1.4842](/materials/material-no/1.4842 "1.4842") | Others | ≤ 0.14 | 14 | | [X6CrNi25-21](/materials/uni/x6crni25-21 "X6CrNi25-21") | [1.4845](/materials/material-no/1.4845 "1.4845") | Heat resistant steels | ≤ 0.1 | 21 | | [X6CrNi25-21KG](/materials/uni/x6crni25-21kg "X6CrNi25-21KG") | [1.4845](/materials/material-no/1.4845 "1.4845") | Heat resistant steels | ≤ 0.1 | 21 | | [X6CrNi2520](/materials/din-en/x6crni25-20 "X6CrNi2520") | [1.4828](/materials/material-no/1.4828 "1.4828") | Heat resistant steels | ≤ 0.2 | 20 | | [X6CrNi2520](/materials/din-en/x6crni25-20 "X6CrNi2520") | [1.4845](/materials/material-no/1.4845 "1.4845") | Heat resistant steels | ≤ 0.1 | 21 | | [X6CrNi304](/materials/uni/x6crni304 "X6CrNi304") | [1.4313](/materials/material-no/1.4313 "1.4313") | Stainless steels | ≤ 0.05 | 8 | | [X6CrNiMoNb1713](/materials/uni/x6crnimonb1713 "X6CrNiMoNb1713") | [1.4583](/materials/material-no/1.4583 "1.4583") | Cast stainless steels | ≤ 0.1 | 5 | | [X6CrNiMoTi 17 12 KG](/materials/uni/x6crnimoti-17-12-kg "X6CrNiMoTi 17 12 KG") | [1.4571](/materials/material-no/1.4571 "1.4571") | Stainless steels | ≤ 0.08 | 18 | | [X6CrNiMoTi 17 12 KW](/materials/uni/x6crnimoti-17-12-kw "X6CrNiMoTi 17 12 KW") | [1.4571](/materials/material-no/1.4571 "1.4571") | Stainless steels | ≤ 0.08 | 18 | | [X6CrNiMoTi17-13](/materials/uni/x6crnimoti17-13 "X6CrNiMoTi17-13") | [1.4573](/materials/material-no/1.4573 "1.4573") | Cast stainless steels | ≤ 0.04 | 12 | | [X6CrNiMoTi1712](/materials/uni/x6crnimoti1712 "X6CrNiMoTi1712") | [1.4571](/materials/material-no/1.4571 "1.4571") | Stainless steels | ≤ 0.08 | 18 | | [X6CrNiNb1811](/materials/uni/x6crninb1811 "X6CrNiNb1811") | [1.4550](/materials/material-no/1.4550 "1.4550") | Stainless steels | ≤ 0.08 | 15 | | [X6CrNiTi18 11](/materials/uni/x6crniti1811 "X6CrNiTi18 11") | [1.4878](/materials/material-no/1.4878 "1.4878") | Heat resistant steels | ≤ 0.1 | 14 | | [X6CrNiTi18-11KG](/materials/uni/x6crniti18-11kg "X6CrNiTi18-11KG") | [1.4541](/materials/material-no/1.4541 "1.4541") | Stainless steels | ≤ 0.08 | 25 | | [X6CrNiTi18-11KT](/materials/uni/x6crniti18-11kt "X6CrNiTi18-11KT") | [1.4541](/materials/material-no/1.4541 "1.4541") | Stainless steels | ≤ 0.08 | 25 | | [X6CrNiTi1811](/materials/uni/x6crniti1811 "X6CrNiTi1811") | [1.4541](/materials/material-no/1.4541 "1.4541") | Stainless steels | ≤ 0.08 | 25 | | [X6CrTi12](/materials/din-en/x6crti12 "X6CrTi12") | [1.4512](/materials/material-no/1.4512 "1.4512") | Stainless steels | ≤ 0.03 | 10 | | [X6CrTi17](/materials/din-en/x6crti17 "X6CrTi17") | [1.4511](/materials/material-no/1.4511 "1.4511") | Stainless steels | ≤ 0.05 | 11 | | [X6CrTi17](/materials/din-en/x6crti17 "X6CrTi17") | [1.4510](/materials/material-no/1.4510 "1.4510") | Stainless steels | ≤ 0.05 | 14 | **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/uni/page/12 "Previous") Page 13 of 14[Next](/materials/uni/page/14 "Next")