--- title: "AE265KR — Heat-resistant structural steels" description: "AE265KR in UNE: material number 1.0423, also listed as P265NB. Category: Heat-resistant structural steels. Designations recorded for this grade: 8." canonical: https://steelequivalents.com/materials/une/ae265kr language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/une/ae265kr.md cs: https://steelequivalents.com/cs/materiály/une/ae265kr.md de: https://steelequivalents.com/de/werkstoffe/une/ae265kr.md es: https://steelequivalents.com/es/materiales/une/ae265kr.md fr: https://steelequivalents.com/fr/matériaux/une/ae265kr.md hu: https://steelequivalents.com/hu/anyagok/une/ae265kr.md it: https://steelequivalents.com/it/materiali/une/ae265kr.md nl: https://steelequivalents.com/nl/materialen/une/ae265kr.md pl: https://steelequivalents.com/pl/materiały/une/ae265kr.md pt: https://steelequivalents.com/pt/materiais/une/ae265kr.md ru: https://steelequivalents.com/ru/материалы/une/ae265kr.md tr: https://steelequivalents.com/tr/malzemeler/une/ae265kr.md zh: https://steelequivalents.com/zh/材料/une/ae265kr.md ja: https://steelequivalents.com/ja/材料/une/ae265kr.md ar: https://steelequivalents.com/ar/المواد/une/ae265kr.md ko: https://steelequivalents.com/ko/재료/une/ae265kr.md pt-br: https://steelequivalents.com/pt-br/materiais/une/ae265kr.md hi: https://steelequivalents.com/hi/सामग्री/une/ae265kr.md content_hash: sha256:9370629263ca619b94a571fae339644fb715018ed429b8db40f4cf7d750c56de 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/une/ae265kr > Canonical URL: https://steelequivalents.com/materials/une/ae265kr > 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. UNE · Spain · 8 designations # AE265KR AE265KR is a designation in UNE for the material held under material number 1.0423, also listed as P265NB. It is a material in the category Heat-resistant structural steels. We list 8 designations recorded for this grade, in the standards DIN / EN, UNS, BS, AFNOR, UNE, JIS and UNI. - [*Material no.* **1.0423**](/materials/material-no/1.0423 "Material no.: 1.0423") - [*Category* **Heat-resistant structural steels · 62 grades**](/categories/heat-resistant-structural-steels "Category: Heat-resistant structural steels · 62 grades") - *Designations* **8** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=fbdc6fe0-9f51-4269-a4d3-3faf3c41dd44&designation=4246771f-cc4d-489c-be3a-8edbd3b8e03f "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/une/ae265kr.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN P265NB This grade’s own name](/materials/din-en/p265nb "DIN / EN P265NB") - [UNS K02505 This grade’s own name · 2 grades on that route](/materials/uns/k02505 "UNS K02505") ## About Heat-resistant structural steels Heat-resistant structural steels are structural steels designed to retain useful strength and dimensional stability at elevated temperatures. They are used for load-bearing components in hot-service equipment where mechanical performance must be maintained during heating. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 8 designations · 7 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 - [HII Indicative](/materials/din-en/hii "DIN / EN HII") - [P265NB This grade’s own name](/materials/din-en/p265nb "DIN / EN P265NB") UNS United States · 1 - [K02505 This grade’s own name](/materials/uns/k02505 "UNS K02505") BS United Kingdom · 1 - [TypeB Indicative](/materials/bs/typeb "BS TypeB") AFNOR France · 1 - [BS2 Indicative](/materials/afnor/bs2 "AFNOR BS2") UNE Spain · 1 - **AE265KR Indicative** JIS Japan · 1 - [SG295 Indicative](/materials/jis/sg295 "JIS SG295") UNI Italy · 1 - [FeE27KR Indicative](/materials/uni/fee27kr "UNI FeE27KR") 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 Mn Si C Iron — the balance, never listed by a standard — 99 % Mn — 0.4 % Si — 0.3 % C — 0.2 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.19 | | Si | ≤ 0.25 | | Mn | ≥ 0.4 | | P | 0.025 | | S | 0.015 | | Al | ≥ 0.02 | | Ti | ≤ 0.03 | | Nb | ≤ 0.05 | | N | 0.009 | Carbon Silicon Manganese Phosphorus Sulfur Aluminium Titanium Niobium 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 | ≤0,19 | — | 0.190 | Max | | N | 0,009 | 0.009 | 0.009 | Exact | | Al | ≥0,020 | 0.020 | — | Min | | Si | ≤0,25 | — | 0.250 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Ti | ≤0,03 | — | 0.030 | Max | | Mn | ≥0,40 | 0.400 | — | Min | | Nb | ≤0,050 | — | 0.050 | 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: Mn, Ni, Cr, 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. ## Properties by condition 1 conditions · 2 values By thickness**Normalized** source `steelnumber` | Thickness mm | A% · Lo = 5,65 √So | |---|---| | ≤ 3 | 24 | | 3 – 5 | 32 | 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. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.0, a shared category, and a published range for Mn / Si 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. [C22.8 1.0460 Mn 0,30-0,90 · Si ≤0,40 - ΔMn 0.20 - ΔSi 0.08 - 9 designations](/materials/din-en/c22-8 "C22.8")[1.0345 1.0345 Mn 0,60-1,20 · Si ≤0,35 - ΔMn 0.50 - ΔSi 0.05 - 62 designations](/materials/material-no/1.0345 "1.0345")[P285NH 1.0477 Mn 0,60-1,40 · Si ≤0,40 - ΔMn 0.60 - ΔSi 0.08 - 3 designations](/materials/din-en/p285nh "P285NH")[1.0425 1.0425 Mn 0,80-1,40 · Si ≤0,40 - ΔMn 0.70 - ΔSi 0.08 - 79 designations](/materials/material-no/1.0425 "1.0425")[1.0436 1.0481 Mn 0,90-1,50 · Si ≤0,40 - ΔMn 0.80 - ΔSi 0.08 - 83 designations](/materials/material-no/1.0436 "1.0436")[19Mn6 1.0473 Mn 1,00-1,70 · Si ≤0,60 - ΔMn 0.95 - ΔSi 0.18 - 26 designations](/materials/din-en/19mn6 "19Mn6") ## 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=fbdc6fe0-9f51-4269-a4d3-3faf3c41dd44&designation=4246771f-cc4d-489c-be3a-8edbd3b8e03f "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/une/ae265kr.pdf "Datasheet as PDF")