--- title: "R30021 — Nickel and cobalt alloys" description: "R30021 in UNS: material number 2.4979, also listed as CoCr28MoNi. Category: Nickel and cobalt alloys. Designations recorded for this grade: 2." canonical: https://steelequivalents.com/materials/uns/r30021 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uns/r30021.md cs: https://steelequivalents.com/cs/materiály/uns/r30021.md de: https://steelequivalents.com/de/werkstoffe/uns/r30021.md es: https://steelequivalents.com/es/materiales/uns/r30021.md fr: https://steelequivalents.com/fr/matériaux/uns/r30021.md hu: https://steelequivalents.com/hu/anyagok/uns/r30021.md it: https://steelequivalents.com/it/materiali/uns/r30021.md nl: https://steelequivalents.com/nl/materialen/uns/r30021.md pl: https://steelequivalents.com/pl/materiały/uns/r30021.md pt: https://steelequivalents.com/pt/materiais/uns/r30021.md ru: https://steelequivalents.com/ru/материалы/uns/r30021.md tr: https://steelequivalents.com/tr/malzemeler/uns/r30021.md zh: https://steelequivalents.com/zh/材料/uns/r30021.md ja: https://steelequivalents.com/ja/材料/uns/r30021.md ar: https://steelequivalents.com/ar/المواد/uns/r30021.md ko: https://steelequivalents.com/ko/재료/uns/r30021.md pt-br: https://steelequivalents.com/pt-br/materiais/uns/r30021.md hi: https://steelequivalents.com/hi/सामग्री/uns/r30021.md content_hash: sha256:b1c0238e4c13df119422ff0f1caddfc0679058b237c83fd44da6afc48f102676 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/r30021 > Canonical URL: https://steelequivalents.com/materials/uns/r30021 > 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 · 2 designations # R30021 R30021 is a designation in UNS for the material held under material number 2.4979, also listed as CoCr28MoNi. It is a material in the category Nickel and cobalt alloys. We list 2 designations recorded for this grade, in the standards DIN / EN and UNS. - [*Material no.* **2.4979**](/materials/material-no/2.4979 "Material no.: 2.4979") - [*Category* **Nickel and cobalt alloys · 87 grades**](/categories/nickel-and-cobalt-alloys "Category: Nickel and cobalt alloys · 87 grades") - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=1c5fe544-43f9-4827-a8c6-480470681a46&designation=5c89dc77-cbb0-4e03-96d4-7ca0fbc5291b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/r30021.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN CoCr28MoNi This grade’s own name](/materials/din-en/cocr28moni "DIN / EN CoCr28MoNi") ## About Nickel and cobalt alloys Nickel and cobalt alloys are metallic materials whose properties are developed through nickel-, cobalt-, or combined alloying systems. They are characterised by strong resistance to corrosion, oxidation, wear, and loss of strength at elevated temperatures, making them suitable for turbine components, chemical-processing equipment, and other demanding high-temperature applications. 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 - [CoCr28MoNi This grade’s own name](/materials/din-en/cocr28moni "DIN / EN CoCr28MoNi") UNS United States · 1 - **R30021 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 9 elements on file · weight % What this alloy is Fe Cr Mo Ni Iron — the balance, never listed by a standard — 61.9 % Cr — 28 % Mo — 5.5 % Ni — 2.3 % Traces & impurities · 2.4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.25–0.35 — Unusual | | Si | ≤ 1 | | Mn | ≤ 1 | | P | 0.045 — Unusual | | S | 0.03 | | Cr | 27–29 | | Mo | 5–6 | | Ni | 1.5–3 | | Co | Balance | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Cobalt 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 | 0,25-0,35 | 0.250 | 0.350 | Range | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Cr | 27,0-29,0 | 27.000 | 29.000 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Co | Rest/Bal. | 59.575 | 66.175 | Balance | | Ni | 1,50-3,00 | 1.500 | 3.000 | Range | | Mo | 5,00-6,00 | 5.000 | 6.000 | 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 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. [CoCr26Ni9Mo5W 2.4681 Co Rest/Bal. · Cr 23,5-27,5 - ΔCo 8.24 - ΔCr 2.50 - 1 designations](/materials/din-en/cocr26ni9mo5w "CoCr26Ni9Mo5W") ## 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=1c5fe544-43f9-4827-a8c6-480470681a46&designation=5c89dc77-cbb0-4e03-96d4-7ca0fbc5291b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/r30021.pdf "Datasheet as PDF")