--- title: "X40MnCr18 — Non-magnetic steels" description: "X40MnCr18: 2 equivalent designations across 2 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/x40mncr18 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/x40mncr18.md cs: https://steelequivalents.com/cs/materiály/din-en/x40mncr18.md de: https://steelequivalents.com/de/werkstoffe/din-en/x40mncr18.md es: https://steelequivalents.com/es/materiales/din-en/x40mncr18.md fr: https://steelequivalents.com/fr/matériaux/din-en/x40mncr18.md hu: https://steelequivalents.com/hu/anyagok/din-en/x40mncr18.md it: https://steelequivalents.com/it/materiali/din-en/x40mncr18.md nl: https://steelequivalents.com/nl/materialen/din-en/x40mncr18.md pl: https://steelequivalents.com/pl/materiały/din-en/x40mncr18.md pt: https://steelequivalents.com/pt/materiais/din-en/x40mncr18.md ru: https://steelequivalents.com/ru/материалы/din-en/x40mncr18.md tr: https://steelequivalents.com/tr/malzemeler/din-en/x40mncr18.md zh: https://steelequivalents.com/zh/材料/din-en/x40mncr18.md ja: https://steelequivalents.com/ja/材料/din-en/x40mncr18.md ar: https://steelequivalents.com/ar/المواد/din-en/x40mncr18.md ko: https://steelequivalents.com/ko/재료/din-en/x40mncr18.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/x40mncr18.md hi: https://steelequivalents.com/hi/सामग्री/din-en/x40mncr18.md content_hash: sha256:52ac5a498adb4f0b8b122ea80b85b92f7ab733aed0b2e5fe635622b7eebca9d5 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/x40mncr18 > Canonical URL: https://steelequivalents.com/materials/din-en/x40mncr18 > 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 · 2 designations # X40MnCr18 X40MnCr18 is a material in the category [Non-magnetic steels](/categories/non-magnetic-steels "Non-magnetic steels"), held under material number 1.3817. Its recorded composition includes C 0.3–0.5%, Si ≤ 1%, Cr 3–5%, Mn 17–19% and Ni 1%. We list one designation recorded for this grade, in the standard ČSN. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.3817**](/materials/material-no/1.3817 "Material no.: 1.3817") - [*Category* **Non-magnetic steels · 31 grades**](/categories/non-magnetic-steels "Category: Non-magnetic steels · 31 grades") - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=d8158a6f-d2db-4d54-a42e-88c0cd0b8894&designation=12ee6022-b63d-424b-bcf6-75b54c4f670b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/x40mncr18.pdf "Datasheet as PDF") ## About Non-magnetic steels Non-magnetic steels are alloy steels designed to have very low magnetic response while retaining useful mechanical strength and ductility. They are used for components and structures where magnetic interference must be minimised, including specialised electrical, laboratory and mechanical 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 - **X40MnCr18 This grade’s own name** ČSN Czechia · 1 - [17 435 Indicative](/materials/csn/17-435 "ČSN 17 435") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 8 elements on file · weight % What this alloy is Fe Mn Cr Si Iron — the balance, never listed by a standard — 75.4 % Mn — 18 % Cr — 4 % Si — 1 % Traces & impurities · 1.6 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.3–0.5 | | Si | ≤ 1 | | Mn | 17–19 | | P | 0.06 | | S | 0.03 | | Cr | 3–5 | | Ni | 1 | | N | ≤ 0.1 | Carbon Silicon Manganese Phosphorus Sulfur Chromium 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 | 0,30-0,50 | 0.300 | 0.500 | Range | | N | ≤0,10 | — | 0.100 | Max | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,06 | 0.060 | 0.060 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Cr | 3,00-5,00 | 3.000 | 5.000 | Range | | Mn | 17,0-19,0 | 17.000 | 19.000 | Range | | Ni | 1 | 1.000 | 1.000 | Exact | 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: 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 1.3, a shared category, and a published range for Mn / Cr 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. [X40MnCrN19 1.3813 Mn 17,0-19,0 · Cr 3,00-5,00 - ΔMn 0.00 - ΔCr 0.00 - 1 designations](/materials/din-en/x40mncrn19 "X40MnCrN19")[X55MnCrN18-4 1.3818 Mn 17,5-20,0 · Cr 4,00-5,00 - ΔMn 0.75 - ΔCr 0.50 - 1 designations](/materials/din-en/x55mncrn18-4 "X55MnCrN18-4")[X 40 MnCr 18 5 1.3812 Mn 17,0-19,0 · Cr 5,00-6,00 - ΔMn 0.00 - ΔCr 1.50 - 1 designations](/materials/din-en/x-40-mncr-18-5 "X 40 MnCr 18 5") ## 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=d8158a6f-d2db-4d54-a42e-88c0cd0b8894&designation=12ee6022-b63d-424b-bcf6-75b54c4f670b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/x40mncr18.pdf "Datasheet as PDF")