--- title: "UNI steel grades — 671 designations — Page 3" 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/3 language: en robots: index, follow og_type: website type: material-standard language_alternates: en: https://steelequivalents.com/materials/uni/page/3.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:ed609d456122a311c76c80076a340993b10e5929c2d60a4bc67f075d19872d67 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/uni/page/3 > Canonical URL: https://steelequivalents.com/materials/uni/page/3 > 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 3 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 | |---|---|---|---|---| | [38Cr4](/materials/din-en/38cr4 "38Cr4") | [1.7034](/materials/material-no/1.7034 "1.7034") | Quenched and tempered steels | 0.34–0.41 | 23 | | [38Cr4KB](/materials/uni/38cr4kb "38Cr4KB") | [1.7034](/materials/material-no/1.7034 "1.7034") | Quenched and tempered steels | 0.34–0.41 | 23 | | [38CrMn4KB](/materials/uni/38crmn4kb "38CrMn4KB") | [1.7034](/materials/material-no/1.7034 "1.7034") | Quenched and tempered steels | 0.34–0.41 | 23 | | [38CrMo4KB](/materials/uni/38crmo4kb "38CrMo4KB") | [1.7225](/materials/material-no/1.7225 "1.7225") | Quenched and tempered steels | 0.38–0.45 | 25 | | [38NCD4](/materials/uni/38ncd4 "38NCD4") | [1.6510](/materials/material-no/1.6510 "1.6510") | Others | 0.35–0.43 | 7 | | [38NiCrMo4](/materials/uni/38nicrmo4 "38NiCrMo4") | [1.6511](/materials/material-no/1.6511 "1.6511") | Quenched and tempered steels | 0.32–0.4 | 18 | | [38NiCrMo4KB](/materials/uni/38nicrmo4kb "38NiCrMo4KB") | [1.6511](/materials/material-no/1.6511 "1.6511") | Quenched and tempered steels | 0.32–0.4 | 18 | | [38NiCrMo4KB](/materials/uni/38nicrmo4kb "38NiCrMo4KB") | [1.6510](/materials/material-no/1.6510 "1.6510") | Others | 0.35–0.43 | 7 | | [39NiCrMo3](/materials/din-en/39nicrmo3 "39NiCrMo3") | [1.6510](/materials/material-no/1.6510 "1.6510") | Others | 0.35–0.43 | 7 | | [3CD5](/materials/uni/3cd5 "3CD5") | [1.0314](/materials/material-no/1.0314 "1.0314") | Unalloyed structural steels | ≤ 0.03 | 14 | | [3CD6](/materials/uni/3cd6 "3CD6") | [1.0314](/materials/material-no/1.0314 "1.0314") | Unalloyed structural steels | ≤ 0.03 | 14 | | [3CD65](/materials/uni/3cd65 "3CD65") | [1.0612](/materials/material-no/1.0612 "1.0612") | Others | 0.63–0.68 | 12 | | [3CD85](/materials/uni/3cd85 "3CD85") | [1.1269](/materials/material-no/1.1269 "1.1269") | Spring steels | 0.8–0.9 | 14 | | [40 NiCrMo 7](/materials/uni/40nicrmo7 "40 NiCrMo 7") | [1.6562](/materials/material-no/1.6562 "1.6562") | Quenched and tempered steels | 0.37–0.44 | 10 | | [40 NiCrMo 7](/materials/uni/40nicrmo7 "40 NiCrMo 7") | [1.6745](/materials/material-no/1.6745 "1.6745") | Others | 0.37–0.43 | 4 | | [40 NiCrMo 7](/materials/uni/40nicrmo7 "40 NiCrMo 7") | [1.6565](/materials/material-no/1.6565 "1.6565") | Quenched and tempered steels | 0.35–0.45 | 15 | | [40CrMnMo7](/materials/din-en/40crmnmo7 "40CrMnMo7") | [1.2311](/materials/material-no/1.2311 "1.2311") | Tool steels for cold work | 0.35–0.45 | 12 | | [40NiCrMo2](/materials/une/40nicrmo2 "40NiCrMo2") | [1.6546](/materials/material-no/1.6546 "1.6546") | Quenched and tempered steels | 0.37–0.44 | 14 | | [40NiCrMo2(KB)](/materials/uni/40nicrmo2-kb "40NiCrMo2(KB)") | [1.6546](/materials/material-no/1.6546 "1.6546") | Quenched and tempered steels | 0.37–0.44 | 14 | | [40NiCrMo7](/materials/uni/40nicrmo7 "40NiCrMo7") | [1.6511](/materials/material-no/1.6511 "1.6511") | Quenched and tempered steels | 0.32–0.4 | 18 | | [41Cr4](/materials/din-en/41cr4 "41Cr4") | [1.7039](/materials/material-no/1.7039 "1.7039") | Quenched and tempered steels | 0.38–0.45 | 13 | | [41Cr4](/materials/din-en/41cr4 "41Cr4") | [1.7035](/materials/material-no/1.7035 "1.7035") | Quenched and tempered steels | 0.38–0.45 | 18 | | [41Cr4](/materials/din-en/41cr4 "41Cr4") | [1.7034](/materials/material-no/1.7034 "1.7034") | Quenched and tempered steels | 0.34–0.41 | 23 | | [41Cr4KB](/materials/uni/41cr4kb "41Cr4KB") | [1.7034](/materials/material-no/1.7034 "1.7034") | Quenched and tempered steels | 0.34–0.41 | 23 | | [41CrAiMo7](/materials/uni/41craimo7 "41CrAiMo7") | [1.8509](/materials/material-no/1.8509 "1.8509") | Nitriding steels | 0.38–0.45 | 16 | | [41CrAlMo7](/materials/din-en/41cralmo7 "41CrAlMo7") | [1.8509](/materials/material-no/1.8509 "1.8509") | Nitriding steels | 0.38–0.45 | 16 | | [41CrMo4](/materials/din-en/41crmo4 "41CrMo4") | [1.7223](/materials/material-no/1.7223 "1.7223") | Steels for surface hardening | 0.38–0.44 | 13 | | [42CrMo4](/materials/din-en/42crmo4 "42CrMo4") | [1.7227](/materials/material-no/1.7227 "1.7227") | Quenched and tempered steels | 0.38–0.45 | 15 | | [42CrMo4](/materials/din-en/42crmo4 "42CrMo4") | [1.7225](/materials/material-no/1.7225 "1.7225") | Quenched and tempered steels | 0.38–0.45 | 25 | | [44NiCrMoV7-KU](/materials/uni/44nicrmov7-ku "44NiCrMoV7-KU") | [1.2714](/materials/material-no/1.2714 "1.2714") | Tool steels for hot work | 0.5–0.6 | 15 | | [44NiCrMoV7KU](/materials/uni/44nicrmov7-ku "44NiCrMoV7KU") | [1.2711](/materials/material-no/1.2711 "1.2711") | Tool steels for cold work | 0.5–0.6 | 16 | | [45NiCrMo16KU](/materials/uni/45nicrmo16ku "45NiCrMo16KU") | [1.2767](/materials/material-no/1.2767 "1.2767") | Tool steels for cold work | 0.4–0.5 | 9 | | [45WCrV8KU](/materials/uni/45wcrv8ku "45WCrV8KU") | [1.2542](/materials/material-no/1.2542 "1.2542") | Tool steels for cold work | 0.4–0.5 | 12 | | [48Si7](/materials/din-en/48si7 "48Si7") | [1.8159](/materials/material-no/1.8159 "1.8159") | Quenched and tempered steels | 0.47–0.55 | 27 | | [48Si7](/materials/din-en/48si7 "48Si7") | [1.7102](/materials/material-no/1.7102 "1.7102") | Spring steels | 0.51–0.59 | 14 | | [50CrV4](/materials/din-en/50crv4 "50CrV4") | [1.8159](/materials/material-no/1.8159 "1.8159") | Quenched and tempered steels | 0.47–0.55 | 27 | | [51CrMnV4KU](/materials/uni/51crmnv4ku "51CrMnV4KU") | [1.8159](/materials/material-no/1.8159 "1.8159") | Quenched and tempered steels | 0.47–0.55 | 27 | | [51CrV4](/materials/din-en/51crv4 "51CrV4") | [1.8159](/materials/material-no/1.8159 "1.8159") | Quenched and tempered steels | 0.47–0.55 | 27 | | [55Cr3](/materials/din-en/55cr3 "55Cr3") | [1.7176](/materials/material-no/1.7176 "1.7176") | Spring steels | 0.52–0.59 | 18 | | [55NiCrMoV7KU](/materials/uni/55nicrmov7ku "55NiCrMoV7KU") | [1.2711](/materials/material-no/1.2711 "1.2711") | Tool steels for cold work | 0.5–0.6 | 16 | | [55NiCrMoV7KU](/materials/uni/55nicrmov7ku "55NiCrMoV7KU") | [1.2714](/materials/material-no/1.2714 "1.2714") | Tool steels for hot work | 0.5–0.6 | 15 | | [55Si7](/materials/din-en/55si7 "55Si7") | [1.5026](/materials/material-no/1.5026 "1.5026") | Spring steels | 0.52–0.6 | 20 | | [55Si8](/materials/uni/55si8 "55Si8") | [1.5026](/materials/material-no/1.5026 "1.5026") | Spring steels | 0.52–0.6 | 20 | | [55WCrV8KU](/materials/uni/55wcrv8ku "55WCrV8KU") | [1.2550](/materials/material-no/1.2550 "1.2550") | Tool steels for cold work | 0.55–0.65 | 15 | | [55WCrV8KU](/materials/uni/55wcrv8ku "55WCrV8KU") | [1.2542](/materials/material-no/1.2542 "1.2542") | Tool steels for cold work | 0.4–0.5 | 12 | | [56NiCrMoV7-KU](/materials/uni/56nicrmov7-ku "56NiCrMoV7-KU") | [1.2714](/materials/material-no/1.2714 "1.2714") | Tool steels for hot work | 0.5–0.6 | 15 | | [60Si7](/materials/din-en/60si7 "60Si7") | [1.0961](/materials/material-no/1.0961 "1.0961") | High-strength multi-phase steels | ≤ 0.18 | 14 | | [60Si7](/materials/din-en/60si7 "60Si7") | [1.5028](/materials/material-no/1.5028 "1.5028") | Spring steels | 0.6–0.7 | 11 | | [60Si7](/materials/din-en/60si7 "60Si7") | [1.5027](/materials/material-no/1.5027 "1.5027") | Spring steels | 0.56–0.64 | 11 | | [60SiCr8](/materials/une/60sicr8 "60SiCr8") | [1.0961](/materials/material-no/1.0961 "1.0961") | High-strength multi-phase steels | ≤ 0.18 | 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/2 "Previous") Page 3 of 14[Next](/materials/uni/page/4 "Next")