--- title: "21MnCr7-5 — High-strength steels" description: "21MnCr7-5: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/21mncr7-5 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/21mncr7-5.md cs: https://steelequivalents.com/cs/materiály/din-en/21mncr7-5.md de: https://steelequivalents.com/de/werkstoffe/din-en/21mncr7-5.md es: https://steelequivalents.com/es/materiales/din-en/21mncr7-5.md fr: https://steelequivalents.com/fr/matériaux/din-en/21mncr7-5.md hu: https://steelequivalents.com/hu/anyagok/din-en/21mncr7-5.md it: https://steelequivalents.com/it/materiali/din-en/21mncr7-5.md nl: https://steelequivalents.com/nl/materialen/din-en/21mncr7-5.md pl: https://steelequivalents.com/pl/materiały/din-en/21mncr7-5.md pt: https://steelequivalents.com/pt/materiais/din-en/21mncr7-5.md ru: https://steelequivalents.com/ru/материалы/din-en/21mncr7-5.md tr: https://steelequivalents.com/tr/malzemeler/din-en/21mncr7-5.md zh: https://steelequivalents.com/zh/材料/din-en/21mncr7-5.md ja: https://steelequivalents.com/ja/材料/din-en/21mncr7-5.md ar: https://steelequivalents.com/ar/المواد/din-en/21mncr7-5.md ko: https://steelequivalents.com/ko/재료/din-en/21mncr7-5.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/21mncr7-5.md hi: https://steelequivalents.com/hi/सामग्री/din-en/21mncr7-5.md content_hash: sha256:3fe57e6597046b746662718fe22a076f4927150e708667dc23700a0f2736bcd9 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/21mncr7-5 > Canonical URL: https://steelequivalents.com/materials/din-en/21mncr7-5 > 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 # 21MnCr7-5 21MnCr7-5 is a material in the category [High-strength steels](/categories/high-strength-steels "High-strength steels"), held under material number 1.8706. Its recorded composition includes C ≤ 0.25%, Si ≤ 0.7%, Cr 0.8–1.6%, Mn ≤ 2% and Cu ≤ 0.6%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.8706**](/materials/material-no/1.8706 "Material no.: 1.8706") - [*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=613e2bc0-c0de-436f-ae2b-d2b9b99cdc2a&designation=b42a1b5b-cd4a-4c60-86af-ae25c0c5ca43 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/21mncr7-5.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 9 elements on file · weight % What this alloy is Fe Mn Cr Si Iron — the balance, never listed by a standard — 94.3 % Mn — 2 % Cr — 1.2 % Si — 0.7 % Traces & impurities · 1.8 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.25 | | Si | ≤ 0.7 | | Mn | ≤ 2 | | P | 0.035 | | S | 0.035 | | Cr | 0.8–1.6 | | Mo | ≤ 0.3 | | Ni | 0.6 | | Cu | ≤ 0.6 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Copper 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 | ≤0,25 | — | 0.250 | Max | | Si | ≤0,70 | — | 0.700 | Max | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,80-1,60 | 0.800 | 1.600 | Range | | Mn | ≤2,00 | — | 2.000 | Max | | Ni | 0,6 | 0.600 | 0.600 | Exact | | Cu | ≤0,60 | — | 0.600 | Max | | Mo | ≤0,30 | — | 0.300 | Max | - (Nb+V+Ti)≤0,20 - (Nb+V+Ti)≤0,20 - (Nb+V+Ti)≤0,20 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 800 °C Predicted Ae1 739 °C Predicted Acm 531 °C Predicted Bs 477 °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 Cr / Mn 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. [21MnCr6-5 1.8705 Cr 0,80-1,60 · Mn ≤1,90 - ΔCr 0.00 - ΔMn 0.05 - 1 designations](/materials/din-en/21mncr6-5 "21MnCr6-5")[17NiCrMnMo5-5 1.8718 Cr 1,00-1,50 · Mn 0,95-1,30 - ΔCr 0.05 - ΔMn 0.13 - 1 designations](/materials/din-en/17nicrmnmo5-5 "17NiCrMnMo5-5")[20MnCr6-5 1.8704 Cr 0,60-1,40 · Mn ≤1,90 - ΔCr 0.20 - ΔMn 0.05 - 1 designations](/materials/din-en/20mncr6-5 "20MnCr6-5")[16CrMo5-2 1.8709 Cr 1,00-1,60 · Mn ≤1,60 - ΔCr 0.10 - ΔMn 0.20 - 1 designations](/materials/din-en/16crmo5-2 "16CrMo5-2")[21CrMo5-2 1.8710 Cr 1,00-1,60 · Mn ≤1,60 - ΔCr 0.10 - ΔMn 0.20 - 1 designations](/materials/din-en/21crmo5-2 "21CrMo5-2")[21MnCr4-3 1.8711 Cr ~0,80 · Mn ~1,00 - ΔCr 0.40 - ΔMn 0.00 - 1 designations](/materials/din-en/21mncr4-3 "21MnCr4-3") ## 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=613e2bc0-c0de-436f-ae2b-d2b9b99cdc2a&designation=b42a1b5b-cd4a-4c60-86af-ae25c0c5ca43 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/21mncr7-5.pdf "Datasheet as PDF")