--- title: "2.4634 — High-temperature steels / aviation variant" description: "2.4634 is the material number of the grade also listed as NiCo20Cr15MoAlTi. It is a material in the category High-temperature steels / aviation variant." canonical: https://steelequivalents.com/materials/material-no/2.4634 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/2.4634.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/2.4634.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/2.4634.md es: https://steelequivalents.com/es/materiales/número-de-material/2.4634.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/2.4634.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/2.4634.md it: https://steelequivalents.com/it/materiali/numero-materiale/2.4634.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/2.4634.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/2.4634.md pt: https://steelequivalents.com/pt/materiais/número-do-material/2.4634.md ru: https://steelequivalents.com/ru/материалы/номер-материала/2.4634.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/2.4634.md zh: https://steelequivalents.com/zh/材料/材料编号/2.4634.md ja: https://steelequivalents.com/ja/材料/材料番号/2.4634.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/2.4634.md ko: https://steelequivalents.com/ko/재료/재료번호/2.4634.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/2.4634.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/2.4634.md content_hash: sha256:8d992043ab33119dbb733d076f9bd90133a087b722ffee721205b97af9a6a4ba 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/2.4634 > Canonical URL: https://steelequivalents.com/materials/material-no/2.4634 > 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 · 7 designations # 2.4634 2.4634 is the material number of the grade also listed as NiCo20Cr15MoAlTi. It is a material in the category High-temperature steels / aviation variant. We list 7 designations recorded for this grade, in the standards DIN / EN, UNS, ASTM, BS, AFNOR and SS. - ***Material no.* **2.4634**** - [*Category* **High-temperature steels / aviation variant · 12 grades**](/categories/high-temperature-steels-aviation-variant "Category: High-temperature steels / aviation variant · 12 grades") - *Designations* **7** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=6ad395bc-8921-40df-9e75-ee3d00970577 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/2.4634.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN NiCo20Cr15MoAlTi This grade’s own name · 2 grades on that route](/materials/din-en/nico20cr15moalti "DIN / EN NiCo20Cr15MoAlTi") - [UNS N13021 This grade’s own name](/materials/uns/n13021 "UNS N13021") ## About High-temperature steels / aviation variant High-temperature aviation steels are heat-resistant materials designed to retain strength and structural stability during prolonged exposure to elevated temperatures. Their alloying provides resistance to creep, oxidation, and thermal degradation, making them suitable for aircraft engine and other hot-section components. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 7 designations · 6 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 - [NiCo20Cr15MoAlTi This grade’s own name](/materials/din-en/nico20cr15moalti "DIN / EN NiCo20Cr15MoAlTi") UNS United States · 1 - [N13021 This grade’s own name](/materials/uns/n13021 "UNS N13021") ASTM United States · 1 - [B637 Indicative](/materials/astm/b637 "ASTM B637") BS United Kingdom · 2 - [5007 Indicative](/materials/bs/500-7 "BS 5007") - [HR 3 Indicative](/materials/is/hr3 "BS HR 3") AFNOR France · 1 - [NCKD 20 ATV Indicative](/materials/afnor/nckd-20-atv "AFNOR NCKD 20 ATV") SS Sweden · 1 - [MH-14 Indicative](/materials/ss/mh-14 "SS MH-14") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 15 elements on file · weight % What this alloy is Fe Co Cr Mo Iron — the balance, never listed by a standard — 51.7 % Co — 20 % Cr — 14.9 % Mo — 5 % Traces & impurities · 8.5 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.12–0.17 | | Si | ≤ 1 | | Mn | ≤ 1 | | P | 0.045 | | S | 0.015 | | Cr | 14–15.7 | | Mo | 4.5–5.5 | | Ni | Balance | | Co | 18–22 | | Cu | ≤ 0.2 | | Al | 4.5–4.9 — Unusual | | Ti | 0.9–1.5 | | B | 0.003–0.01 | | Zr | ≤ 0.15 | | Fe | ≤ 1 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Cobalt Copper Aluminium Titanium Boron Zirconium Iron 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 | |---|---|---|---|---| | B | 0,003-0,01 | 0.003 | 0.010 | Range | | C | 0,12-0,17 | 0.120 | 0.170 | Range | | Al | 4,50-4,90 | 4.500 | 4.900 | Range | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Ti | 0,90-1,50 | 0.900 | 1.500 | Range | | Cr | 14,0-15,7 | 14.000 | 15.700 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Fe | ≤1,00 | — | 1.000 | Max | | Co | 18,0-22,0 | 18.000 | 22.000 | Range | | Ni | Rest/Bal. | 46.810 | 57.917 | Balance | | Cu | ≤0,20 | — | 0.200 | Max | | Zr | ≤0,15 | — | 0.150 | Max | | Mo | 4,50-5,50 | 4.500 | 5.500 | Range | 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. ## 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 2.4, a shared category, and a published range for Ni / Co 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. [NiCr20Co18Ti 2.4632 Ni Rest/Bal. · Co 15,0-21,0 - ΔNi 4.10 - ΔCo 2.00 - 14 designations](/materials/din-en/nicr20co18ti "NiCr20Co18Ti") ## 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=6ad395bc-8921-40df-9e75-ee3d00970577 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/2.4634.pdf "Datasheet as PDF")