--- title: "X12CrNiMoN12 — High-temperature steels / aviation variant" description: "X12CrNiMoN12 in DIN / EN: material number 1.4939, also listed as X12CrNiMo12. Category: High-temperature steels / aviation variant." canonical: https://steelequivalents.com/materials/din-en/x12crnimon12 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/x12crnimon12.md cs: https://steelequivalents.com/cs/materiály/din-en/x12crnimon12.md de: https://steelequivalents.com/de/werkstoffe/din-en/x12crnimon12.md es: https://steelequivalents.com/es/materiales/din-en/x12crnimon12.md fr: https://steelequivalents.com/fr/matériaux/din-en/x12crnimon12.md hu: https://steelequivalents.com/hu/anyagok/din-en/x12crnimon12.md it: https://steelequivalents.com/it/materiali/din-en/x12crnimon12.md nl: https://steelequivalents.com/nl/materialen/din-en/x12crnimon12.md pl: https://steelequivalents.com/pl/materiały/din-en/x12crnimon12.md pt: https://steelequivalents.com/pt/materiais/din-en/x12crnimon12.md ru: https://steelequivalents.com/ru/материалы/din-en/x12crnimon12.md tr: https://steelequivalents.com/tr/malzemeler/din-en/x12crnimon12.md zh: https://steelequivalents.com/zh/材料/din-en/x12crnimon12.md ja: https://steelequivalents.com/ja/材料/din-en/x12crnimon12.md ar: https://steelequivalents.com/ar/المواد/din-en/x12crnimon12.md ko: https://steelequivalents.com/ko/재료/din-en/x12crnimon12.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/x12crnimon12.md hi: https://steelequivalents.com/hi/सामग्री/din-en/x12crnimon12.md content_hash: sha256:f605d8dc9cae2be747498c6212d8bbfdb769f11c8c245a7d270cd82222cf8c47 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/x12crnimon12 > Canonical URL: https://steelequivalents.com/materials/din-en/x12crnimon12 > 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 · 5 designations # X12CrNiMoN12 X12CrNiMoN12 is a designation in DIN / EN for the material held under material number 1.4939, also listed as X12CrNiMo12. It is a material in the category High-temperature steels / aviation variant. We list 5 designations recorded for this grade, in the standards DIN / EN, UNS and AISI / SAE. - [*Material no.* **1.4939**](/materials/material-no/1.4939 "Material no.: 1.4939") - [*Category* **High-temperature steels / aviation variant · 12 grades**](/categories/high-temperature-steels-aviation-variant "Category: High-temperature steels / aviation variant · 12 grades") - *Designations* **5** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=8d796fd5-ed47-4324-b784-169d3f95d87e&designation=00e412a9-b870-4612-b1c4-23a2aee2267a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/x12crnimon12.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN X12CrNiMo12 This grade’s own name](/materials/din-en/x12crnimo12 "DIN / EN X12CrNiMo12") - [UNS S41428 This grade’s own name](/materials/uns/s41428 "UNS S41428") - [AISI / SAE XM-32 This grade’s own name · 2 grades on that route](/materials/aisi-sae/xm-32 "AISI / SAE XM-32") ## About High-temperature steels / aviation variant High-temperature aviation steels are heat-resistant materials designed to retain strength and structural stability during prolonged exposure to elevated temperatures. Their alloying provides resistance to creep, oxidation, and thermal degradation, making them suitable for aircraft engine and other hot-section components. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 5 designations · 3 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 · 2 - [X12CrNiMo12 This grade’s own name](/materials/din-en/x12crnimo12 "DIN / EN X12CrNiMo12") - **X12CrNiMoN12 This grade’s own name** UNS United States · 2 - [S41428 This grade’s own name](/materials/uns/s41428 "UNS S41428") - [S64152 This grade’s own name](/materials/uns/s64152 "UNS S64152") AISI / SAE United States · 1 - [XM-32 This grade’s own name](/materials/aisi-sae/xm-32 "AISI / SAE XM-32") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 10 elements on file · weight % What this alloy is Fe Cr Ni Mo Iron — the balance, never listed by a standard — 82.4 % Cr — 11.8 % Ni — 2.5 % Mo — 1.8 % Traces & impurities · 1.6 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.08–0.13 | | Si | ≤ 0.35 | | Mn | 0.5–0.9 | | P | 0.025 | | S | 0.02 | | Cr | 11–12.5 | | Mo | 1.5–2 | | Ni | 2–3 | | V | 0.25–0.4 | | N | 0.02–0.04 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Vanadium Nitrogen 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 | 0,08-0,13 | 0.080 | 0.130 | Range | | N | 0,020-0,040 | 0.020 | 0.040 | Range | | Si | ≤0,35 | — | 0.350 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,02 | 0.020 | 0.020 | Exact | | V | 0,25-0,40 | 0.250 | 0.400 | Range | | Cr | 11,0-12,5 | 11.000 | 12.500 | Range | | Mn | 0,50-0,90 | 0.500 | 0.900 | Range | | Ni | 2,00-3,00 | 2.000 | 3.000 | Range | | Mo | 1,50-2,00 | 1.500 | 2.000 | 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 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. ## 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=8d796fd5-ed47-4324-b784-169d3f95d87e&designation=00e412a9-b870-4612-b1c4-23a2aee2267a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/x12crnimon12.pdf "Datasheet as PDF")