--- title: "1.4949 — High-temperature steels" description: "1.4949 is the material number of the grade also listed as X3CrNiN18-11. Category: High-temperature steels. Designations recorded for this grade: 2." canonical: https://steelequivalents.com/materials/material-no/1.4949 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.4949.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.4949.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.4949.md es: https://steelequivalents.com/es/materiales/número-de-material/1.4949.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.4949.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.4949.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.4949.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.4949.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.4949.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.4949.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.4949.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.4949.md zh: https://steelequivalents.com/zh/材料/材料编号/1.4949.md ja: https://steelequivalents.com/ja/材料/材料番号/1.4949.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.4949.md ko: https://steelequivalents.com/ko/재료/재료번호/1.4949.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.4949.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.4949.md content_hash: sha256:c0ea8aa9057f11ee2cca17bcfdce9f3686715e4419b5c8240e634590a3279178 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/material-no/1.4949 > Canonical URL: https://steelequivalents.com/materials/material-no/1.4949 > 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. Material number · Europe · 2 designations # 1.4949 1.4949 is the material number of the grade also listed as X3CrNiN18-11. It is a material in the category High-temperature steels. We list 2 designations recorded for this grade, in the standards DIN / EN and UNS. - ***Material no.* **1.4949**** - [*Category* **High-temperature steels · 40 grades**](/categories/high-temperature-steels "Category: High-temperature steels · 40 grades") - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=d4a27d3e-7a93-4a12-aec5-2a9dc40b8d7b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.4949.pdf "Datasheet as PDF") ## About High-temperature steels High-temperature steels are steels designed to retain useful strength and structural stability during exposure to elevated temperatures. Their alloying systems provide resistance to oxidation, creep and loss of mechanical properties during prolonged heating, making them suitable for furnace components, heat exchangers, boilers and other hot-service equipment. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 2 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 - [X3CrNiN18-11 This grade’s own name Withdrawn](/materials/din-en/x3crnin18-11 "DIN / EN X3CrNiN18-11") UNS United States · 1 - [N08811 Indicative](/materials/uns/n08811 "UNS N08811") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 9 elements on file · weight % What this alloy is Fe Cr Ni Mn Iron — the balance, never listed by a standard — 68.2 % Cr — 18 % Ni — 10.5 % Mn — 2 % Traces & impurities · 1.3 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.04 | | Si | ≤ 0.75 | | Mn | ≤ 2 | | P | 0.035 | | S | 0.015 | | Cr | 17–19 | | Mo | 0.2–0.5 | | Ni | 9.5–11.5 | | N | 0.1–0.18 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel 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 | ≤0,04 | — | 0.040 | Max | | N | 0,10-0,18 | 0.100 | 0.180 | Range | | Si | ≤0,75 | — | 0.750 | Max | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 17,0-19,0 | 17.000 | 19.000 | Range | | Mn | ≤2,00 | — | 2.000 | Max | | Ni | 9,50-11,5 | 9.500 | 11.500 | Range | | Mo | 0,20-0,50 | 0.200 | 0.500 | 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 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 1.4, 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. [X6CrNiTiB18-10 1.4941 Cr 17,0-19,0 · Ni 9,00-12,0 - ΔCr 0.00 - ΔNi 0.00 - 5 designations](/materials/din-en/x6crnitib18-10 "X6CrNiTiB18-10")[X7CrNiTi18-10 1.4940 Cr 17,0-19,0 · Ni 9,00-13,0 - ΔCr 0.00 - ΔNi 0.50 - 3 designations](/materials/din-en/x7crniti18-10 "X7CrNiTi18-10")[X6CrNi18-10 1.4948 Cr 17,0-19,0 · Ni 8,00-11,0 - ΔCr 0.00 - ΔNi 1.00 - 17 designations](/materials/din-en/x6crni18-10 "X6CrNi18-10")[X2CrNiMoN17-12-2 1.4909 Cr 17,0-18,0 · Ni 11,0-13,0 - ΔCr 0.50 - ΔNi 1.50 - 5 designations](/materials/din-en/x2crnimon17-12-2 "X2CrNiMoN17-12-2") ## 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=d4a27d3e-7a93-4a12-aec5-2a9dc40b8d7b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.4949.pdf "Datasheet as PDF")