--- title: "21CrMo5-2 — High-strength steels" description: "21CrMo5-2: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/21crmo5-2 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/21crmo5-2.md cs: https://steelequivalents.com/cs/materiály/din-en/21crmo5-2.md de: https://steelequivalents.com/de/werkstoffe/din-en/21crmo5-2.md es: https://steelequivalents.com/es/materiales/din-en/21crmo5-2.md fr: https://steelequivalents.com/fr/matériaux/din-en/21crmo5-2.md hu: https://steelequivalents.com/hu/anyagok/din-en/21crmo5-2.md it: https://steelequivalents.com/it/materiali/din-en/21crmo5-2.md nl: https://steelequivalents.com/nl/materialen/din-en/21crmo5-2.md pl: https://steelequivalents.com/pl/materiały/din-en/21crmo5-2.md pt: https://steelequivalents.com/pt/materiais/din-en/21crmo5-2.md ru: https://steelequivalents.com/ru/материалы/din-en/21crmo5-2.md tr: https://steelequivalents.com/tr/malzemeler/din-en/21crmo5-2.md zh: https://steelequivalents.com/zh/材料/din-en/21crmo5-2.md ja: https://steelequivalents.com/ja/材料/din-en/21crmo5-2.md ar: https://steelequivalents.com/ar/المواد/din-en/21crmo5-2.md ko: https://steelequivalents.com/ko/재료/din-en/21crmo5-2.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/21crmo5-2.md hi: https://steelequivalents.com/hi/सामग्री/din-en/21crmo5-2.md content_hash: sha256:185c209bf0db034850f5d24f35c7fd653eb9b0e795ff7b5e4591f704e0c0c256 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/21crmo5-2 > Canonical URL: https://steelequivalents.com/materials/din-en/21crmo5-2 > 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 # 21CrMo5-2 21CrMo5-2 is a material in the category [High-strength steels](/categories/high-strength-steels "High-strength steels"), held under material number 1.8710. Its recorded composition includes C ≤ 0.26%, Si 0.3–0.6%, Cr 1–1.6%, Mn ≤ 1.6% and Ni 1.2%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.8710**](/materials/material-no/1.8710 "Material no.: 1.8710") - [*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=6964d0a0-d786-4e46-ad44-8dac4c33a1dc&designation=2ed23583-37cf-45bd-a97f-63bf0d7afa57 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/21crmo5-2.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 8 elements on file · weight % What this alloy is Fe Mn Cr Ni Iron — the balance, never listed by a standard — 94.9 % Mn — 1.6 % Cr — 1.3 % Ni — 1.2 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.26 | | Si | 0.3–0.6 | | Mn | ≤ 1.6 | | P | 0.015 | | S | 0.005 | | Cr | 1–1.6 | | Mo | 0.15–0.3 | | Ni | 1.2 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel 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 | ≤0,26 | — | 0.260 | Max | | Si | 0,30-0,60 | 0.300 | 0.600 | Range | | P | 0,015 | 0.015 | 0.015 | Exact | | S | 0,005 | 0.005 | 0.005 | Exact | | Cr | 1,00-1,60 | 1.000 | 1.600 | Range | | Mn | ≤1,60 | — | 1.600 | Max | | Ni | 1,2 | 1.200 | 1.200 | Exact | | Mo | 0,15-0,30 | 0.150 | 0.300 | 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 788 °C Predicted Ae1 734 °C Predicted Acm 529 °C Predicted Bs 481 °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 / 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. [16CrMo5-2 1.8709 Cr 1,00-1,60 · Ni 1,2 - ΔCr 0.00 - ΔNi 0.00 - 1 designations](/materials/din-en/16crmo5-2 "16CrMo5-2")[17NiCrMnMo5-5 1.8718 Cr 1,00-1,50 · Ni 1,20-1,50 - ΔCr 0.05 - ΔNi 0.15 - 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=6964d0a0-d786-4e46-ad44-8dac4c33a1dc&designation=2ed23583-37cf-45bd-a97f-63bf0d7afa57 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/21crmo5-2.pdf "Datasheet as PDF")