--- title: "20NiCrMo3 — Case hardening steels" description: "20NiCrMo3: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/20nicrmo3 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/20nicrmo3.md cs: https://steelequivalents.com/cs/materiály/din-en/20nicrmo3.md de: https://steelequivalents.com/de/werkstoffe/din-en/20nicrmo3.md es: https://steelequivalents.com/es/materiales/din-en/20nicrmo3.md fr: https://steelequivalents.com/fr/matériaux/din-en/20nicrmo3.md hu: https://steelequivalents.com/hu/anyagok/din-en/20nicrmo3.md it: https://steelequivalents.com/it/materiali/din-en/20nicrmo3.md nl: https://steelequivalents.com/nl/materialen/din-en/20nicrmo3.md pl: https://steelequivalents.com/pl/materiały/din-en/20nicrmo3.md pt: https://steelequivalents.com/pt/materiais/din-en/20nicrmo3.md ru: https://steelequivalents.com/ru/материалы/din-en/20nicrmo3.md tr: https://steelequivalents.com/tr/malzemeler/din-en/20nicrmo3.md zh: https://steelequivalents.com/zh/材料/din-en/20nicrmo3.md ja: https://steelequivalents.com/ja/材料/din-en/20nicrmo3.md ar: https://steelequivalents.com/ar/المواد/din-en/20nicrmo3.md ko: https://steelequivalents.com/ko/재료/din-en/20nicrmo3.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/20nicrmo3.md hi: https://steelequivalents.com/hi/सामग्री/din-en/20nicrmo3.md content_hash: sha256:fd95e3250fc6e89eac5cd628fe2d963d65e7474b6f29b179b99dc6f82c53a23d generated: 2026-09-24 --- > **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/din-en/20nicrmo3 > Canonical URL: https://steelequivalents.com/materials/din-en/20nicrmo3 > 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. DIN / EN · Europe · 1 designation # 20NiCrMo3 20NiCrMo3 is a material in the category [Case hardening steels](/categories/case-hardening-steels "Case hardening steels"), held under material number 1.6527. Its recorded composition includes C 0.17–0.23%, Si ≤ 0.25%, Cr 0.4–0.6%, Mn 0.7–1% and Ni 0.7–0.9%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.78 g/cm³. - [*Material no.* **1.6527**](/materials/material-no/1.6527 "Material no.: 1.6527") - [*Category* **Case hardening steels · 60 grades**](/categories/case-hardening-steels "Category: Case hardening steels · 60 grades") - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=0d393710-d82e-480f-992f-dd87a384deb8&designation=a65acc7f-2803-4ec7-a6e3-fc2746efe118 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/20nicrmo3.pdf "Datasheet as PDF") ## 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. ## Chemical composition 11 elements on file · weight % What this alloy is Fe Mn Ni Cr Iron — the balance, never listed by a standard — 96.9 % Mn — 0.9 % Ni — 0.8 % Cr — 0.5 % Traces & impurities · 0.9 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.17–0.23 | | Si | ≤ 0.25 | | Mn | 0.7–1 | | P | 0.02 | | S | 0.015 | | Cr | 0.4–0.6 | | Mo | 0.15–0.25 | | Ni | 0.7–0.9 | | Cu | ≤ 0.2 | | Al | 0.025–0.05 | | N | 0.012 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Copper Aluminium Nitrogen 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 | 0,17-0,23 | 0.170 | 0.230 | Range | | N | 0,012 | 0.012 | 0.012 | Exact | | Al | 0,025-0,050 | 0.025 | 0.050 | Range | | Si | ≤0,25 | — | 0.250 | Max | | P | 0,02 | 0.020 | 0.020 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 0,40-0,60 | 0.400 | 0.600 | Range | | Mn | 0,70-1,00 | 0.700 | 1.000 | Range | | Ni | 0,70-0,90 | 0.700 | 0.900 | Range | | Cu | ≤0,20 | — | 0.200 | Max | | Mo | 0,15-0,25 | 0.150 | 0.250 | 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 computed from composition · °C Predicted Ae3 793 °C Predicted Ae1 715 °C Predicted Acm 463 °C Predicted Bs 545 °C These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either. ## 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. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.6, a shared category, and a published range for Mn / Ni that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade. [20MnNiCrMo3-2 1.6522 Mn 0,70-1,00 · Ni 0,40-0,70 - ΔMn 0.00 - ΔNi 0.25 - 14 designations](/materials/din-en/20mnnicrmo3-2 "20MnNiCrMo3-2")[1.6523 1.6523 Mn 0,65-0,95 · Ni 0,40-0,70 - ΔMn 0.05 - ΔNi 0.25 - 63 designations](/materials/material-no/1.6523 "1.6523")[20NiCrMoS2-2 1.6526 Mn 0,65-0,95 · Ni 0,40-0,70 - ΔMn 0.05 - ΔNi 0.25 - 19 designations](/materials/din-en/20nicrmos2-2 "20NiCrMoS2-2")[21 NiCrMo 2 2 1.6543 Mn 0,70-0,90 · Ni 0,40-0,70 - ΔMn 0.05 - ΔNi 0.25 - 18 designations](/materials/din-en/21-nicrmo-2-2 "21 NiCrMo 2 2") ## 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=0d393710-d82e-480f-992f-dd87a384deb8&designation=a65acc7f-2803-4ec7-a6e3-fc2746efe118 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/20nicrmo3.pdf "Datasheet as PDF")