--- title: "40MnCrNiMo6-6-6 — High-strength steels" description: "40MnCrNiMo6-6-6: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/40mncrnimo6-6-6 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/40mncrnimo6-6-6.md cs: https://steelequivalents.com/cs/materiály/din-en/40mncrnimo6-6-6.md de: https://steelequivalents.com/de/werkstoffe/din-en/40mncrnimo6-6-6.md es: https://steelequivalents.com/es/materiales/din-en/40mncrnimo6-6-6.md fr: https://steelequivalents.com/fr/matériaux/din-en/40mncrnimo6-6-6.md hu: https://steelequivalents.com/hu/anyagok/din-en/40mncrnimo6-6-6.md it: https://steelequivalents.com/it/materiali/din-en/40mncrnimo6-6-6.md nl: https://steelequivalents.com/nl/materialen/din-en/40mncrnimo6-6-6.md pl: https://steelequivalents.com/pl/materiały/din-en/40mncrnimo6-6-6.md pt: https://steelequivalents.com/pt/materiais/din-en/40mncrnimo6-6-6.md ru: https://steelequivalents.com/ru/материалы/din-en/40mncrnimo6-6-6.md tr: https://steelequivalents.com/tr/malzemeler/din-en/40mncrnimo6-6-6.md zh: https://steelequivalents.com/zh/材料/din-en/40mncrnimo6-6-6.md ja: https://steelequivalents.com/ja/材料/din-en/40mncrnimo6-6-6.md ar: https://steelequivalents.com/ar/المواد/din-en/40mncrnimo6-6-6.md ko: https://steelequivalents.com/ko/재료/din-en/40mncrnimo6-6-6.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/40mncrnimo6-6-6.md hi: https://steelequivalents.com/hi/सामग्री/din-en/40mncrnimo6-6-6.md content_hash: sha256:ccfda494b42d435ffce18b54178c45069c0e7542c4405113087bb5b712f820aa generated: 2026-09-21 --- > **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/40mncrnimo6-6-6 > Canonical URL: https://steelequivalents.com/materials/din-en/40mncrnimo6-6-6 > 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 # 40MnCrNiMo6-6-6 40MnCrNiMo6-6-6 is a material in the category [High-strength steels](/categories/high-strength-steels "High-strength steels"), held under material number 1.8735. Its recorded composition includes C ≤ 0.4%, Si ≤ 0.8%, Cr ≤ 1.5%, Mn ≤ 1.5% and Ni 1.5%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.8735**](/materials/material-no/1.8735 "Material no.: 1.8735") - [*Category* **High-strength steels · 128 grades**](/categories/high-strength-steels "Category: High-strength steels · 128 grades") - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=0da33570-2d5b-42b4-ac08-d300bf0b6d63&designation=5e7dd749-450d-4a41-864a-3fa6e914e4d6 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/40mncrnimo6-6-6.pdf "Datasheet as PDF") ## About High-strength steels High-strength steels are steels designed to carry high loads while resisting deformation. They are used for load-bearing structures, vehicles and machinery where strength, durability and reduced material weight are important. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Chemical composition 10 elements on file · weight % What this alloy is Fe Mn Cr Ni Iron — the balance, never listed by a standard — 93.7 % Mn — 1.5 % Cr — 1.5 % Ni — 1.5 % Traces & impurities · 1.8 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.4 — Unusual | | Si | ≤ 0.8 | | Mn | ≤ 1.5 | | P | 0.025 | | S | 0.01 | | Cr | ≤ 1.5 | | Mo | ≤ 0.5 | | Ni | 1.5 | | Nb | ≤ 0.05 | | B | ≤ 0.005 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Niobium Boron 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 | |---|---|---|---|---| | B | ≤0,005 | — | 0.005 | Max | | C | ≤0,40 | — | 0.400 | Max | | Si | ≤0,80 | — | 0.800 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,01 | 0.010 | 0.010 | Exact | | Cr | ≤1,50 | — | 1.500 | Max | | Mn | ≤1,50 | — | 1.500 | Max | | Ni | 1,5 | 1.500 | 1.500 | Exact | | Nb | ≤0,05 | — | 0.050 | Max | | Mo | ≤0,50 | — | 0.500 | Max | 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 768 °C Predicted Ae1 733 °C Predicted Acm 627 °C Predicted Bs 467 °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 7,85 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 1.8, a shared category, and a published range for Ni / Cr 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. [17NiCrMnMo5-5 1.8718 Ni 1,20-1,50 · Cr 1,00-1,50 - ΔNi 0.15 - ΔCr 0.50 - 1 designations](/materials/din-en/17nicrmnmo5-5 "17NiCrMnMo5-5") ## 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=0da33570-2d5b-42b4-ac08-d300bf0b6d63&designation=5e7dd749-450d-4a41-864a-3fa6e914e4d6 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/40mncrnimo6-6-6.pdf "Datasheet as PDF")