--- title: "18CN8 — Case hardening steels" description: "18CN8 in AFNOR: material number 1.5920, also listed as 18CrNi8. Category: Case hardening steels. Designations recorded for this grade: 9." canonical: https://steelequivalents.com/materials/afnor/18cn8 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/afnor/18cn8.md cs: https://steelequivalents.com/cs/materiály/afnor/18cn8.md de: https://steelequivalents.com/de/werkstoffe/afnor/18cn8.md es: https://steelequivalents.com/es/materiales/afnor/18cn8.md fr: https://steelequivalents.com/fr/matériaux/afnor/18cn8.md hu: https://steelequivalents.com/hu/anyagok/afnor/18cn8.md it: https://steelequivalents.com/it/materiali/afnor/18cn8.md nl: https://steelequivalents.com/nl/materialen/afnor/18cn8.md pl: https://steelequivalents.com/pl/materiały/afnor/18cn8.md pt: https://steelequivalents.com/pt/materiais/afnor/18cn8.md ru: https://steelequivalents.com/ru/материалы/afnor/18cn8.md tr: https://steelequivalents.com/tr/malzemeler/afnor/18cn8.md zh: https://steelequivalents.com/zh/材料/afnor/18cn8.md ja: https://steelequivalents.com/ja/材料/afnor/18cn8.md ar: https://steelequivalents.com/ar/المواد/afnor/18cn8.md ko: https://steelequivalents.com/ko/재료/afnor/18cn8.md pt-br: https://steelequivalents.com/pt-br/materiais/afnor/18cn8.md hi: https://steelequivalents.com/hi/सामग्री/afnor/18cn8.md content_hash: sha256:1ac7bc61518f8c53bc5414296bae1e13e3469789c0a93e51f4835667d1a87884 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/afnor/18cn8 > Canonical URL: https://steelequivalents.com/materials/afnor/18cn8 > 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. AFNOR · France · 9 designations # 18CN8 18CN8 is a designation in AFNOR for the material held under material number 1.5920, also listed as 18CrNi8. It is a material in the category Case hardening steels. We list 9 designations recorded for this grade, in the standards DIN / EN, AFNOR, UNE, ČSN, PN, SRPS and STAS. - [*Material no.* **1.5920**](/materials/material-no/1.5920 "Material no.: 1.5920") - [*Category* **Case hardening steels · 60 grades**](/categories/case-hardening-steels "Category: Case hardening steels · 60 grades") - *Designations* **9** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=2d8ba203-e395-4707-a4b9-90a1045143e1&designation=4314f686-52eb-4211-b6ca-dd4eb13ca5df "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/afnor/18cn8.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 18CrNi8 This grade’s own name](/materials/din-en/18crni8 "DIN / EN 18CrNi8") ## About Case hardening steels Case hardening steels are steels designed to develop a hard, wear-resistant surface while retaining a tough and ductile core. They are used for components such as gears, shafts and other machine parts exposed to contact wear and cyclic loading. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 9 designations · 7 standards · nothing hidden 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. DIN / EN Europe · 1 - [18CrNi8 This grade’s own name](/materials/din-en/18crni8 "DIN / EN 18CrNi8") AFNOR France · 2 - **18CN8 Indicative** - [18NC11 Indicative](/materials/afnor/18nc11 "AFNOR 18NC11") UNE Spain · 2 - [A-150.E Indicative](/materials/une/a-150-e "UNE A-150.E") - [F-150.E Indicative](/materials/une/f-150-e "UNE F-150.E") ČSN Czechia · 1 - [16231 Indicative](/materials/csn/16231 "ČSN 16231") PN Poland · 1 - [18H2N2 Indicative](/materials/pn/18h2n2 "PN 18H2N2") SRPS Serbia · 1 - [Č.5421 Indicative](/materials/srps/c-5421 "SRPS Č.5421") STAS Romania · 1 - [18CrNi20 Indicative](/materials/stas/18crni20 "STAS 18CrNi20") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 8 elements on file · weight % What this alloy is Fe Cr Ni Mn Iron — the balance, never listed by a standard — 95.1 % Cr — 2 % Ni — 2 % Mn — 0.5 % Traces & impurities · 0.5 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.15–0.2 | | Si | 0.15–0.4 | | Mn | 0.4–0.6 | | P | 0.035 | | S | 0.035 | | Cr | 1.8–2.1 — Unusual | | Ni | 1.8–2.1 | | Al | ≥ 0.02 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel Aluminium 0.01 % 0.1 % 1 % 10 % 100 % The scale is logarithmic, not the element’s raw share of the alloy — the only honest way to fit 0.01 % and 100 % in one picture, and it means every value here can be compared with every other. | Element | As published source text, verbatim | Min% by weight | Max% by weight | Bound | |---|---|---|---|---| | C | 0,15-0,20 | 0.150 | 0.200 | Range | | Al | (≥0,02) | 0.020 | — | Min | | Si | 0,15-0,40 | 0.150 | 0.400 | Range | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 1,80-2,10 | 1.800 | 2.100 | Range | | Mn | 0,40-0,60 | 0.400 | 0.600 | Range | | Ni | 1,80-2,10 | 1.800 | 2.100 | Range | The published column is the source string byte-for-byte, decimal comma and all; Min and Max are the parsed bounds. Elements not listed have no value on file — they are omitted, never inferred. ## Predicted transformation temperatures Not enough recorded composition to predict a transformation temperature for this grade — missing: Mo. ## Physical & mechanical properties Density 7,78 g/cm³ Exact An absent property means we hold no value for it — it is left out rather than estimated, interpolated from a neighbouring grade, or filled from a handbook. It does not mean the property is undefined for the material. ## Looking for this grade under another name? Search the catalogue by designation, material number or composition — every name on this page is itself a way in. [Search](/search "Steel grade search")[Inquiry](/inquiry?material=2d8ba203-e395-4707-a4b9-90a1045143e1&designation=4314f686-52eb-4211-b6ca-dd4eb13ca5df "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/afnor/18cn8.pdf "Datasheet as PDF")