--- title: "X33CrNiMnN23-8 — Valve steels" description: "X33CrNiMnN23-8: 3 equivalent designations across 3 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/x33crnimnn23-8 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/x33crnimnn23-8.md cs: https://steelequivalents.com/cs/materiály/din-en/x33crnimnn23-8.md de: https://steelequivalents.com/de/werkstoffe/din-en/x33crnimnn23-8.md es: https://steelequivalents.com/es/materiales/din-en/x33crnimnn23-8.md fr: https://steelequivalents.com/fr/matériaux/din-en/x33crnimnn23-8.md hu: https://steelequivalents.com/hu/anyagok/din-en/x33crnimnn23-8.md it: https://steelequivalents.com/it/materiali/din-en/x33crnimnn23-8.md nl: https://steelequivalents.com/nl/materialen/din-en/x33crnimnn23-8.md pl: https://steelequivalents.com/pl/materiały/din-en/x33crnimnn23-8.md pt: https://steelequivalents.com/pt/materiais/din-en/x33crnimnn23-8.md ru: https://steelequivalents.com/ru/материалы/din-en/x33crnimnn23-8.md tr: https://steelequivalents.com/tr/malzemeler/din-en/x33crnimnn23-8.md zh: https://steelequivalents.com/zh/材料/din-en/x33crnimnn23-8.md ja: https://steelequivalents.com/ja/材料/din-en/x33crnimnn23-8.md ar: https://steelequivalents.com/ar/المواد/din-en/x33crnimnn23-8.md ko: https://steelequivalents.com/ko/재료/din-en/x33crnimnn23-8.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/x33crnimnn23-8.md hi: https://steelequivalents.com/hi/सामग्री/din-en/x33crnimnn23-8.md content_hash: sha256:195f14a89a3fb31e18bb784d2950c132c22efe728b0c8c7518bed2908f8397ca 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/x33crnimnn23-8 > Canonical URL: https://steelequivalents.com/materials/din-en/x33crnimnn23-8 > 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 · 3 designations # X33CrNiMnN23-8 X33CrNiMnN23-8 is a material in the category [Valve steels](/categories/valve-steels "Valve steels"), held under material number 1.4866. Its recorded composition includes C 0.28–0.38%, Si 0.5–1%, Cr 22–24%, Mn 1.5–3.5% and Ni 7–9%. We list 2 designations recorded for this grade, in the standards UNS and AISI / SAE. Recorded mechanical properties include HRC 25. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.4866**](/materials/material-no/1.4866 "Material no.: 1.4866") - [*Category* **Valve steels · 14 grades**](/categories/valve-steels "Category: Valve steels · 14 grades") - *Designations* **3** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=45032128-ea16-4a53-ac10-4d1e27a52aa4&designation=22fbc1ce-0e27-47f5-bb7c-0c0a174c944c "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/x33crnimnn23-8.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [UNS S63018 This grade’s own name](/materials/uns/s63018 "UNS S63018") - [AISI / SAE EV 16 This grade’s own name](/materials/aisi-sae/ev-16 "AISI / SAE EV 16") ## About Valve steels Valve steels are alloy steels developed for valve components exposed to heat, pressure, wear, and corrosive service conditions. They are characterised by combinations of strength, hardness, toughness, and resistance to oxidation or corrosion suited to the operating environment. Typical uses include engine valves and industrial valve parts where reliable performance and dimensional stability are required. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 3 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 · 1 - **X33CrNiMnN23-8 This grade’s own name** UNS United States · 1 - [S63018 This grade’s own name](/materials/uns/s63018 "UNS S63018") AISI / SAE United States · 1 - [EV 16 This grade’s own name](/materials/aisi-sae/ev-16 "AISI / SAE EV 16") 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 Mn Iron — the balance, never listed by a standard — 64 % Cr — 23 % Ni — 8 % Mn — 2.5 % Traces & impurities · 2.5 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.28–0.38 | | Si | 0.5–1 | | Mn | 1.5–3.5 — Unusual | | P | 0.045 | | S | 0.03 | | Cr | 22–24 | | Mo | ≤ 0.5 | | Ni | 7–9 | | W | ≤ 0.5 | | N | 0.25–0.35 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Tungsten 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 | 0,28-0,38 | 0.280 | 0.380 | Range | | N | 0,25-0,35 | 0.250 | 0.350 | Range | | Si | 0,50-1,00 | 0.500 | 1.000 | Range | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Cr | 22,0-24,0 | 22.000 | 24.000 | Range | | Mn | 1,50-3,50 | 1.500 | 3.500 | Range | | Ni | 7,00-9,00 | 7.000 | 9.000 | Range | | Mo | ≤0,50 | — | 0.500 | Max | | W | ≤0,50 | — | 0.500 | Max | 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. ## Properties by condition 1 conditions · 1 values By delivery state**Solution annealed** source `steelnumber` | Delivery state | HRC | |---|---| | Solution annealed | 25 | Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ. ## 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=45032128-ea16-4a53-ac10-4d1e27a52aa4&designation=22fbc1ce-0e27-47f5-bb7c-0c0a174c944c "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/x33crnimnn23-8.pdf "Datasheet as PDF")