--- title: "NiCr21Mo — Nickel and cobalt alloys" description: "NiCr21Mo: 18 equivalent designations across 5 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/nicr21mo language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/nicr21mo.md cs: https://steelequivalents.com/cs/materiály/din-en/nicr21mo.md de: https://steelequivalents.com/de/werkstoffe/din-en/nicr21mo.md es: https://steelequivalents.com/es/materiales/din-en/nicr21mo.md fr: https://steelequivalents.com/fr/matériaux/din-en/nicr21mo.md hu: https://steelequivalents.com/hu/anyagok/din-en/nicr21mo.md it: https://steelequivalents.com/it/materiali/din-en/nicr21mo.md nl: https://steelequivalents.com/nl/materialen/din-en/nicr21mo.md pl: https://steelequivalents.com/pl/materiały/din-en/nicr21mo.md pt: https://steelequivalents.com/pt/materiais/din-en/nicr21mo.md ru: https://steelequivalents.com/ru/материалы/din-en/nicr21mo.md tr: https://steelequivalents.com/tr/malzemeler/din-en/nicr21mo.md zh: https://steelequivalents.com/zh/材料/din-en/nicr21mo.md ja: https://steelequivalents.com/ja/材料/din-en/nicr21mo.md ar: https://steelequivalents.com/ar/المواد/din-en/nicr21mo.md ko: https://steelequivalents.com/ko/재료/din-en/nicr21mo.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/nicr21mo.md hi: https://steelequivalents.com/hi/सामग्री/din-en/nicr21mo.md content_hash: sha256:f4fb759e79593f1309c3f870a520be82c42c36ae37ba99e00c6f4089ff28fd21 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/nicr21mo > Canonical URL: https://steelequivalents.com/materials/din-en/nicr21mo > 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 · 18 designations # NiCr21Mo NiCr21Mo is a material in the category [Nickel and cobalt alloys](/categories/nickel-and-cobalt-alloys "Nickel and cobalt alloys"), held under material number 2.4858. We list 17 designations recorded for this grade, in the standards UNS, ASTM, BS and AFNOR. Its recorded composition includes C ≤ 0.025%, Cr 19.5–23.5%, Ni 38–46%, Cu 1.5–3% and Mo 2.5–3.5%. Its recorded density is 8.14 g/cm³. - [*Material no.* **2.4858**](/materials/material-no/2.4858 "Material no.: 2.4858") - [*Category* **Nickel and cobalt alloys · 87 grades**](/categories/nickel-and-cobalt-alloys "Category: Nickel and cobalt alloys · 87 grades") - *Designations* **18** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=8bccdd95-b586-4a1f-9146-532497977e18&designation=31deb461-d3b2-4812-9fd4-baf8ba602c2a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/nicr21mo.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [UNS N08825 This grade’s own name](/materials/uns/n08825 "UNS N08825") ## About Nickel and cobalt alloys Nickel and cobalt alloys are metallic materials whose properties are developed through nickel-, cobalt-, or combined alloying systems. They are characterised by strong resistance to corrosion, oxidation, wear, and loss of strength at elevated temperatures, making them suitable for turbine components, chemical-processing equipment, and other demanding high-temperature applications. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 18 designations · 5 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 - **NiCr21Mo This grade’s own name** UNS United States · 2 - [N08825 This grade’s own name](/materials/uns/n08825 "UNS N08825") - [N08826 This grade’s own name](/materials/uns/n08826 "UNS N08826") ASTM United States · 13 - [B 423 Indicative](/materials/astm/b-423 "ASTM B 423") - [B 424 Indicative](/materials/astm/b-424 "ASTM B 424") - [B 425 Indicative](/materials/astm/b-425 "ASTM B 425") - [B 564 Indicative](/materials/astm/b564 "ASTM B 564") - [B 705 Indicative](/materials/astm/b705 "ASTM B 705") - [B 751 Indicative](/materials/astm/b751 "ASTM B 751") - [B 755 Indicative](/materials/astm/b-755 "ASTM B 755") - [B 829 Indicative](/materials/astm/b829 "ASTM B 829") - [B 906 Indicative](/materials/astm/b906 "ASTM B 906") - [B163 Indicative](/materials/astm/b163 "ASTM B163") - [B366 Indicative](/materials/astm/b366 "ASTM B366") - [B704 Indicative](/materials/astm/b704 "ASTM B704") - [B775 Indicative](/materials/astm/b775 "ASTM B775") BS United Kingdom · 1 - [3072-76 Indicative](/materials/bs/3072-76 "BS 3072-76") AFNOR France · 1 - [NC 21 FeDU Indicative](/materials/afnor/nc-21-fedu "AFNOR NC 21 FeDU") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 13 elements on file · weight % What this alloy is Fe Ni Cr Mo Iron — the balance, never listed by a standard — 27.6 % Ni — 42 % Cr — 21.5 % Mo — 3 % Traces & impurities · 5.9 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.025 | | Si | ≤ 0.5 | | Mn | ≤ 1 | | P | 0.02 | | S | 0.015 | | Cr | 19.5–23.5 | | Mo | 2.5–3.5 | | Ni | 38–46 | | Co | ≤ 1 | | Cu | 1.5–3 | | Al | ≤ 0.2 | | Ti | 0.6–1.2 | | Fe | Balance | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Cobalt Copper Aluminium Titanium Iron 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 | ≤0,025 | — | 0.025 | Max | | Al | ≤0,20 | — | 0.200 | Max | | Si | ≤0,50 | — | 0.500 | Max | | P | 0,02 | 0.020 | 0.020 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Ti | 0,60-1,20 | 0.600 | 1.200 | Range | | Cr | 19,5-23,5 | 19.500 | 23.500 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Fe | Rest/Bal. | 20.040 | 37.865 | Balance | | Co | ≤1,00 | — | 1.000 | Max | | Ni | 38,0-46,0 | 38.000 | 46.000 | Range | | Cu | 1,50-3,00 | 1.500 | 3.000 | Range | | Mo | 2,50-3,50 | 2.500 | 3.500 | 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 This grade's composition falls outside the published model's validated range (a low-alloy composition window), so no transformation temperature is predicted here. ## Physical & mechanical properties Density 8,14 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 2.4, a shared category, and a published range for Ni / Fe 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. [NiCr13Mo6Ti3 2.4662 Ni 40,0-45,0 · Fe Rest/Bal. - ΔNi 0.50 - ΔFe 6.11 - 9 designations](/materials/din-en/nicr13mo6ti3 "NiCr13Mo6Ti3")[NiCr28FeSiCe 2.4889 Ni ≥45,0 · Fe 21,0-25,0 - ΔNi 3.00 - ΔFe 5.95 - 1 designations](/materials/din-en/nicr28fesice "NiCr28FeSiCe")[NiCr22Mo6Cu 2.4618 Ni Rest/Bal. · Fe 18,0-21,0 - ΔNi 1.81 - ΔFe 9.45 - 2 designations](/materials/din-en/nicr22mo6cu "NiCr22Mo6Cu")[NiCr22Mo7Cu 2.4619 Ni Rest/Bal. · Fe 18,0-21,0 - ΔNi 2.70 - ΔFe 9.45 - 2 designations](/materials/din-en/nicr22mo7cu "NiCr22Mo7Cu")[NiCr20CuMo 2.4660 Ni 32,0-38,0 · Fe Rest/Bal. - ΔNi 7.00 - ΔFe 7.72 - 15 designations](/materials/din-en/nicr20cumo "NiCr20CuMo")[NiCr26MoW 2.4608 Ni 44,0-47,0 · Fe Rest/Bal. - ΔNi 3.50 - ΔFe 11.66 - 7 designations](/materials/din-en/nicr26mow "NiCr26MoW") ## 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=8bccdd95-b586-4a1f-9146-532497977e18&designation=31deb461-d3b2-4812-9fd4-baf8ba602c2a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/nicr21mo.pdf "Datasheet as PDF")