--- title: "21Mn6 — Heat-resistant structural steels" description: "21Mn6: 4 equivalent designations across 2 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/21mn6 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/21mn6.md cs: https://steelequivalents.com/cs/materiály/din-en/21mn6.md de: https://steelequivalents.com/de/werkstoffe/din-en/21mn6.md es: https://steelequivalents.com/es/materiales/din-en/21mn6.md fr: https://steelequivalents.com/fr/matériaux/din-en/21mn6.md hu: https://steelequivalents.com/hu/anyagok/din-en/21mn6.md it: https://steelequivalents.com/it/materiali/din-en/21mn6.md nl: https://steelequivalents.com/nl/materialen/din-en/21mn6.md pl: https://steelequivalents.com/pl/materiały/din-en/21mn6.md pt: https://steelequivalents.com/pt/materiais/din-en/21mn6.md ru: https://steelequivalents.com/ru/материалы/din-en/21mn6.md tr: https://steelequivalents.com/tr/malzemeler/din-en/21mn6.md zh: https://steelequivalents.com/zh/材料/din-en/21mn6.md ja: https://steelequivalents.com/ja/材料/din-en/21mn6.md ar: https://steelequivalents.com/ar/المواد/din-en/21mn6.md ko: https://steelequivalents.com/ko/재료/din-en/21mn6.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/21mn6.md hi: https://steelequivalents.com/hi/सामग्री/din-en/21mn6.md content_hash: sha256:e554956bd0537dd0ee73c5a2bff1ef5cf1f8828b36b6d8cb73eb9c52cc7ada7a generated: 2026-09-22 --- > **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/21mn6 > Canonical URL: https://steelequivalents.com/materials/din-en/21mn6 > 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 · 4 designations # 21Mn6 21Mn6 is a material in the category [Heat-resistant structural steels](/categories/heat-resistant-structural-steels "Heat-resistant structural steels"), held under material number 1.0485. Its recorded composition includes C ≤ 0.23%, Si ≤ 0.6%, P 0.045%, S 0.045% and Mn 1.15–1.6%. We list 3 designations recorded for this grade, in the standards UNS. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.0485**](/materials/material-no/1.0485 "Material no.: 1.0485") - [*Category* **Heat-resistant structural steels · 62 grades**](/categories/heat-resistant-structural-steels "Category: Heat-resistant structural steels · 62 grades") - *Designations* **4** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=ff83fe5c-686a-4dc3-9b74-82a354d243ff&designation=fab48fb7-45b9-4aba-823c-97e39a12a301 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/21mn6.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [UNS K02700 This grade’s own name · 9 grades on that route](/materials/uns/k02700 "UNS K02700") ## 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. ## Also known as 4 designations · 2 standards · nothing hidden This grade’s own name recorded in our sources as this grade’s own designation under that standard. Indicative taken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering. Withdrawn designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once. DIN / EN Europe · 1 - **21Mn6 This grade’s own name** UNS United States · 3 - [K02700 This grade’s own name](/materials/uns/k02700 "UNS K02700") - [K02803 This grade’s own name](/materials/uns/k02803 "UNS K02803") - [K03300 This grade’s own name](/materials/uns/k03300 "UNS K03300") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 5 elements on file · weight % What this alloy is Fe Mn Si C Iron — the balance, never listed by a standard — 97.7 % Mn — 1.4 % Si — 0.6 % C — 0.2 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.23 | | Si | ≤ 0.6 | | Mn | 1.15–1.6 | | P | 0.045 — Unusual | | S | 0.045 — Unusual | Carbon Silicon Manganese Phosphorus Sulfur 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 | ≤0,23 | — | 0.230 | Max | | Si | ≤0,60 | — | 0.600 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,045 | 0.045 | 0.045 | Exact | | Mn | 1,15-1,60 | 1.150 | 1.600 | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni, Cr, Mo. ## 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 1.0, 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. [19Mn6 1.0473 Mn 1,00-1,70 · Si ≤0,60 - ΔMn 0.02 - ΔSi 0.00 - 26 designations](/materials/din-en/19mn6 "19Mn6")[1.0436 1.0481 Mn 0,90-1,50 · Si ≤0,40 - ΔMn 0.18 - ΔSi 0.10 - 83 designations](/materials/material-no/1.0436 "1.0436")[1.0425 1.0425 Mn 0,80-1,40 · Si ≤0,40 - ΔMn 0.27 - ΔSi 0.10 - 79 designations](/materials/material-no/1.0425 "1.0425")[19Mn5 1.0482 Mn 1,00-1,30 · Si 0,30-0,60 - ΔMn 0.23 - ΔSi 0.15 - 9 designations](/materials/din-en/19mn5 "19Mn5")[P285NH 1.0477 Mn 0,60-1,40 · Si ≤0,40 - ΔMn 0.38 - ΔSi 0.10 - 3 designations](/materials/din-en/p285nh "P285NH")[1.0345 1.0345 Mn 0,60-1,20 · Si ≤0,35 - ΔMn 0.48 - ΔSi 0.13 - 62 designations](/materials/material-no/1.0345 "1.0345") ## 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=ff83fe5c-686a-4dc3-9b74-82a354d243ff&designation=fab48fb7-45b9-4aba-823c-97e39a12a301 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/21mn6.pdf "Datasheet as PDF")