--- title: "K91670 — Resistance heating alloys" description: "K91670 in UNS: material number 1.4725, also listed as X8CrAl14-4. Category: Resistance heating alloys. Designations recorded for this grade: 3." canonical: https://steelequivalents.com/materials/uns/k91670 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uns/k91670.md cs: https://steelequivalents.com/cs/materiály/uns/k91670.md de: https://steelequivalents.com/de/werkstoffe/uns/k91670.md es: https://steelequivalents.com/es/materiales/uns/k91670.md fr: https://steelequivalents.com/fr/matériaux/uns/k91670.md hu: https://steelequivalents.com/hu/anyagok/uns/k91670.md it: https://steelequivalents.com/it/materiali/uns/k91670.md nl: https://steelequivalents.com/nl/materialen/uns/k91670.md pl: https://steelequivalents.com/pl/materiały/uns/k91670.md pt: https://steelequivalents.com/pt/materiais/uns/k91670.md ru: https://steelequivalents.com/ru/материалы/uns/k91670.md tr: https://steelequivalents.com/tr/malzemeler/uns/k91670.md zh: https://steelequivalents.com/zh/材料/uns/k91670.md ja: https://steelequivalents.com/ja/材料/uns/k91670.md ar: https://steelequivalents.com/ar/المواد/uns/k91670.md ko: https://steelequivalents.com/ko/재료/uns/k91670.md pt-br: https://steelequivalents.com/pt-br/materiais/uns/k91670.md hi: https://steelequivalents.com/hi/सामग्री/uns/k91670.md content_hash: sha256:2b12dbcefab27951d979629775519aedd797285c8c68ece3b4df28ac7e5264fb generated: 2026-09-22 --- > **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/uns/k91670 > Canonical URL: https://steelequivalents.com/materials/uns/k91670 > 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. UNS · United States · 3 designations # K91670 K91670 is a designation in UNS for the material held under material number 1.4725, also listed as X8CrAl14-4. It is a material in the category Resistance heating alloys. We list 3 designations recorded for this grade, in the standards DIN / EN and UNS. - [*Material no.* **1.4725**](/materials/material-no/1.4725 "Material no.: 1.4725") - [*Category* **Resistance heating alloys · 9 grades**](/categories/resistance-heating-alloys "Category: Resistance heating alloys · 9 grades") - *Designations* **3** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=fddf9520-9f65-47c0-ad22-0576c790568a&designation=f82d4892-cf92-4802-9651-3242a98845a4 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/k91670.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN CrAl 14 4 This grade’s own name](/materials/din-en/cral-14-4 "DIN / EN CrAl 14 4") ## About Resistance heating alloys Resistance heating alloys are metallic alloys designed to generate heat when an electric current passes through them. They combine electrical resistance with stability during prolonged heating, making them suitable for heating elements in furnaces, ovens and industrial equipment. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 3 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 · 2 - [CrAl 14 4 This grade’s own name](/materials/din-en/cral-14-4 "DIN / EN CrAl 14 4") - [X8CrAl14-4 This grade’s own name](/materials/din-en/x8cral14-4 "DIN / EN X8CrAl14-4") UNS United States · 1 - **K91670 This grade’s own name** Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 7 elements on file · weight % What this alloy is Fe Cr Al Mn Iron — the balance, never listed by a standard — 80.1 % Cr — 14 % Al — 4.3 % Mn — 1 % Traces & impurities · 0.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.1 | | Si | ≤ 0.5 | | Mn | ≤ 1 | | P | 0.045 | | S | 0.03 | | Cr | 13–15 | | Al | 3.5–5 — Unusual | Carbon Silicon Manganese Phosphorus Sulfur Chromium 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 | ≤0,10 | — | 0.100 | Max | | Al | 3,50-5,00 | 3.500 | 5.000 | Range | | Si | ≤0,50 | — | 0.500 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Cr | 13,0-15,0 | 13.000 | 15.000 | Range | | Mn | ≤1,00 | — | 1.000 | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni, 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. ## 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=fddf9520-9f65-47c0-ad22-0576c790568a&designation=f82d4892-cf92-4802-9651-3242a98845a4 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/k91670.pdf "Datasheet as PDF")