--- title: "2.4778 — Heat-resistant cast steels" description: "2.4778 is the material number of the grade also listed as G-CoCr28. Category: Heat-resistant cast steels. Designations recorded for this grade: 1." canonical: https://steelequivalents.com/materials/material-no/2.4778 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/2.4778.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/2.4778.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/2.4778.md es: https://steelequivalents.com/es/materiales/número-de-material/2.4778.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/2.4778.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/2.4778.md it: https://steelequivalents.com/it/materiali/numero-materiale/2.4778.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/2.4778.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/2.4778.md pt: https://steelequivalents.com/pt/materiais/número-do-material/2.4778.md ru: https://steelequivalents.com/ru/материалы/номер-материала/2.4778.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/2.4778.md zh: https://steelequivalents.com/zh/材料/材料编号/2.4778.md ja: https://steelequivalents.com/ja/材料/材料番号/2.4778.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/2.4778.md ko: https://steelequivalents.com/ko/재료/재료번호/2.4778.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/2.4778.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/2.4778.md content_hash: sha256:d666003c7a2ca6a96cd187a2d50c9584c5b9d21f632bf948128e91f87787af82 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/material-no/2.4778 > Canonical URL: https://steelequivalents.com/materials/material-no/2.4778 > 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 · 1 designation # 2.4778 2.4778 is the material number of the grade also listed as G-CoCr28. It is a material in the category Heat-resistant cast steels. We list 1 designations recorded for this grade, in the standards DIN / EN. - ***Material no.* **2.4778**** - [*Category* **Heat-resistant cast steels · 82 grades**](/categories/heat-resistant-cast-steels "Category: Heat-resistant cast steels · 82 grades") - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=4d9dc16b-3a8b-4f3d-aaaa-05a36b7f3388 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/2.4778.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN G-CoCr28 This grade’s own name](/materials/din-en/g-cocr28 "DIN / EN G-CoCr28") ## About Heat-resistant cast steels Heat-resistant cast steels are cast ferrous alloys formulated for service at elevated temperatures, where resistance to softening and thermal degradation is important. They are used for furnace components, heat-treatment equipment and other high-temperature plant parts that require cast shapes and dependable mechanical performance during heating. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 1 designations · 1 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 - [G-CoCr28 This grade’s own name](/materials/din-en/g-cocr28 "DIN / EN G-CoCr28") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 11 elements on file · weight % What this alloy is Fe Co Cr Ni Iron — the balance, never listed by a standard — 13.8 % Co — 50 % Cr — 28.5 % Ni — 4 % Traces & impurities · 3.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.05–0.25 | | Si | 0.5–1.5 | | Mn | ≤ 1.5 | | P | 0.04 | | S | 0.03 | | Cr | 27–30 | | Mo | ≤ 0.5 | | Ni | 4 | | Co | 48–52 — Unusual | | Nb | ≤ 0.5 | | Fe | Balance | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Cobalt Niobium 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 | |---|---|---|---|---| | C | 0,05-0,25 | 0.050 | 0.250 | Range | | Si | 0,50-1,50 | 0.500 | 1.500 | Range | | P | 0,04 | 0.040 | 0.040 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Cr | 27,0-30,0 | 27.000 | 30.000 | Range | | Mn | ≤1,50 | — | 1.500 | Max | | Fe | Rest/Bal. | 9.680 | 20.380 | Balance | | Co | 48,0-52,0 | 48.000 | 52.000 | Range | | Ni | 4 | 4.000 | 4.000 | Exact | | Nb | ≤0,50 | — | 0.500 | Max | | Mo | ≤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. ## 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 Co / Cr 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. [G-CoCr28Nb 2.4779 Co 48,0-52,0 · Cr 27,0-30,0 - ΔCo 0.00 - ΔCr 0.00 - 1 designations](/materials/din-en/g-cocr28nb "G-CoCr28Nb") ## 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=4d9dc16b-3a8b-4f3d-aaaa-05a36b7f3388 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/2.4778.pdf "Datasheet as PDF")