--- title: "10MnMo4-5 — Heat-resistant structural steels" description: "10MnMo4-5: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/10mnmo4-5 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/10mnmo4-5.md cs: https://steelequivalents.com/cs/materiály/din-en/10mnmo4-5.md de: https://steelequivalents.com/de/werkstoffe/din-en/10mnmo4-5.md es: https://steelequivalents.com/es/materiales/din-en/10mnmo4-5.md fr: https://steelequivalents.com/fr/matériaux/din-en/10mnmo4-5.md hu: https://steelequivalents.com/hu/anyagok/din-en/10mnmo4-5.md it: https://steelequivalents.com/it/materiali/din-en/10mnmo4-5.md nl: https://steelequivalents.com/nl/materialen/din-en/10mnmo4-5.md pl: https://steelequivalents.com/pl/materiały/din-en/10mnmo4-5.md pt: https://steelequivalents.com/pt/materiais/din-en/10mnmo4-5.md ru: https://steelequivalents.com/ru/материалы/din-en/10mnmo4-5.md tr: https://steelequivalents.com/tr/malzemeler/din-en/10mnmo4-5.md zh: https://steelequivalents.com/zh/材料/din-en/10mnmo4-5.md ja: https://steelequivalents.com/ja/材料/din-en/10mnmo4-5.md ar: https://steelequivalents.com/ar/المواد/din-en/10mnmo4-5.md ko: https://steelequivalents.com/ko/재료/din-en/10mnmo4-5.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/10mnmo4-5.md hi: https://steelequivalents.com/hi/सामग्री/din-en/10mnmo4-5.md content_hash: sha256:36002ce27305be2da51ffe9789063bf131193d37b3768e74ce9be458112cf6d8 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/10mnmo4-5 > Canonical URL: https://steelequivalents.com/materials/din-en/10mnmo4-5 > 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 # 10MnMo4-5 10MnMo4-5 is a material in the category [Heat-resistant structural steels](/categories/heat-resistant-structural-steels "Heat-resistant structural steels"), held under material number 1.5424. Its recorded composition includes C 0.08–0.12%, Si 0.55–0.75%, Mn 0.95–1.25%, Cu ≤ 0.17% and Mo 0.48–0.62%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.5424**](/materials/material-no/1.5424 "Material no.: 1.5424") - [*Category* **Heat-resistant structural steels · 62 grades**](/categories/heat-resistant-structural-steels "Category: Heat-resistant structural steels · 62 grades") - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=6914d609-f3e8-42a0-aa92-fb7ca479594c&designation=97de2069-15ef-473b-89b3-a036af0ccfd3 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/10mnmo4-5.pdf "Datasheet as PDF") ## About Heat-resistant structural steels Heat-resistant structural steels are structural steels designed to retain useful strength and dimensional stability at elevated temperatures. They are used for load-bearing components in hot-service equipment where mechanical performance must be maintained during heating. 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 Si Mo Iron — the balance, never listed by a standard — 97.1 % Mn — 1.1 % Si — 0.7 % Mo — 0.6 % Traces & impurities · 0.6 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.08–0.12 | | Si | 0.55–0.75 — Unusual | | Mn | 0.95–1.25 | | P | 0.02 | | S | 0.02 | | Cr | ≤ 0.12 | | Mo | 0.48–0.62 | | Ni | 0.12 | | Cu | ≤ 0.17 | | Al | ≤ 0.03 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Copper 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 | 0,08-0,12 | 0.080 | 0.120 | Range | | Al | ≤0,030 | — | 0.030 | Max | | Si | 0,55-0,75 | 0.550 | 0.750 | Range | | P | 0,02 | 0.020 | 0.020 | Exact | | S | 0,02 | 0.020 | 0.020 | Exact | | Cr | ≤0,12 | — | 0.120 | Max | | Mn | 0,95-1,25 | 0.950 | 1.250 | Range | | Ni | 0,12 | 0.120 | 0.120 | Exact | | Cu | ≤0,17 | — | 0.170 | Max | | Mo | 0,48-0,62 | 0.480 | 0.620 | 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 847 °C Predicted Ae1 723 °C Predicted Acm 369 °C Predicted Bs 555 °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 1.5, a shared category, and a published range for Mn / Si 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. [10MnMoCrV4-7 1.5407 Mn 0,70-1,10 · Si 0,40-0,70 - ΔMn 0.20 - ΔSi 0.10 - 1 designations](/materials/din-en/10mnmocrv4-7 "10MnMoCrV4-7")[G18Mo5 1.5422 Mn 0,80-1,20 · Si ≤0,60 - ΔMn 0.10 - ΔSi 0.35 - 1 designations](/materials/din-en/g18mo5 "G18Mo5")[26MnMoB6-4 1.5465 Mn 1,25-1,50 · Si 0,30-0,60 - ΔMn 0.27 - ΔSi 0.20 - 1 designations](/materials/din-en/26mnmob6-4 "26MnMoB6-4")[G20Mo5 1.5419 Mn 0,50-1,00 · Si ≤0,60 - ΔMn 0.35 - ΔSi 0.35 - 6 designations](/materials/din-en/g20mo5 "G20Mo5")[G10MnMoV6-3 1.5410 Mn 1,20-1,80 · Si ≤0,60 - ΔMn 0.40 - ΔSi 0.35 - 1 designations](/materials/din-en/g10mnmov6-3 "G10MnMoV6-3") ## 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=6914d609-f3e8-42a0-aa92-fb7ca479594c&designation=97de2069-15ef-473b-89b3-a036af0ccfd3 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/10mnmo4-5.pdf "Datasheet as PDF")