--- title: "1.2891 — Nitriding steels" description: "1.2891 is the material number of the grade also listed as 34CrAlNi7. It is a material in the category Nitriding steels. Designations recorded for this grade: 2." canonical: https://steelequivalents.com/materials/material-no/1.2891 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.2891.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.2891.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.2891.md es: https://steelequivalents.com/es/materiales/número-de-material/1.2891.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.2891.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.2891.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.2891.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.2891.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.2891.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.2891.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.2891.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.2891.md zh: https://steelequivalents.com/zh/材料/材料编号/1.2891.md ja: https://steelequivalents.com/ja/材料/材料番号/1.2891.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.2891.md ko: https://steelequivalents.com/ko/재료/재료번호/1.2891.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.2891.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.2891.md content_hash: sha256:921a4e76d7ed17f365be39bb10a8d47df65f11a502f5d5ee3a22dc46e623e820 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/1.2891 > Canonical URL: https://steelequivalents.com/materials/material-no/1.2891 > 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 # 1.2891 1.2891 is the material number of the grade also listed as 34CrAlNi7. It is a material in the category Nitriding steels. We list 2 designations recorded for this grade, in the standards DIN / EN and PN. - ***Material no.* **1.2891**** - [*Category* **Nitriding steels · 11 grades**](/categories/nitriding-steels "Category: Nitriding steels · 11 grades") - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=cea68b24-99fb-4461-b0dd-544fae14505d "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.2891.pdf "Datasheet as PDF") ## About Nitriding steels Nitriding steels are alloy steels designed for nitriding, a surface-hardening treatment that produces a hard, wear-resistant surface while retaining a tough supporting core. They are used for gears, shafts, dies and other components requiring resistance to wear, repeated loading and dimensional change in service. 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 - [34CrAlNi7 This grade’s own name Withdrawn](/materials/din-en/34cralni7 "DIN / EN 34CrAlNi7") PN Poland · 1 - [33H2NMJ Indicative](/materials/pn/33h2nmj "PN 33H2NMJ") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 5 elements on file · weight % What this alloy is Fe Cr Ni Al Iron — the balance, never listed by a standard — 95.8 % Cr — 1.7 % Ni — 1 % Al — 1 % Traces & impurities · 0.5 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.35 | | Cr | 1.7 | | Mo | 0.2 | | Ni | 1 | | Al | 1 | Carbon Chromium Molybdenum Nickel Aluminium 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 | 0,35 | 0.350 | 0.350 | Exact | | Al | 1 | 1.000 | 1.000 | Exact | | Cr | 1,7 | 1.700 | 1.700 | Exact | | Ni | 1 | 1.000 | 1.000 | Exact | | Mo | 0,2 | 0.200 | 0.200 | 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: Mn, Si. ## 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=cea68b24-99fb-4461-b0dd-544fae14505d "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.2891.pdf "Datasheet as PDF")