--- title: "R30031 — Nickel and cobalt alloys" description: "R30031 in UNS: material number 2.4682, also listed as G-CoCr25NiW. Category: Nickel and cobalt alloys. Designations recorded for this grade: 2." canonical: https://steelequivalents.com/materials/uns/r30031 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uns/r30031.md cs: https://steelequivalents.com/cs/materiály/uns/r30031.md de: https://steelequivalents.com/de/werkstoffe/uns/r30031.md es: https://steelequivalents.com/es/materiales/uns/r30031.md fr: https://steelequivalents.com/fr/matériaux/uns/r30031.md hu: https://steelequivalents.com/hu/anyagok/uns/r30031.md it: https://steelequivalents.com/it/materiali/uns/r30031.md nl: https://steelequivalents.com/nl/materialen/uns/r30031.md pl: https://steelequivalents.com/pl/materiały/uns/r30031.md pt: https://steelequivalents.com/pt/materiais/uns/r30031.md ru: https://steelequivalents.com/ru/материалы/uns/r30031.md tr: https://steelequivalents.com/tr/malzemeler/uns/r30031.md zh: https://steelequivalents.com/zh/材料/uns/r30031.md ja: https://steelequivalents.com/ja/材料/uns/r30031.md ar: https://steelequivalents.com/ar/المواد/uns/r30031.md ko: https://steelequivalents.com/ko/재료/uns/r30031.md pt-br: https://steelequivalents.com/pt-br/materiais/uns/r30031.md hi: https://steelequivalents.com/hi/सामग्री/uns/r30031.md content_hash: sha256:d81827511615d4b0ecc8fa1de83c10b5d605cf8e93eef99c84ee980ded9d226b 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/r30031 > Canonical URL: https://steelequivalents.com/materials/uns/r30031 > 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 # R30031 R30031 is a designation in UNS for the material held under material number 2.4682, also listed as G-CoCr25NiW. 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.* **2.4682**](/materials/material-no/2.4682 "Material no.: 2.4682") - [*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=e4fb7e79-99ea-458c-b7f4-5b0a51b9b005&designation=f1f6565a-cdcf-468d-a70f-96948798f8bf "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/r30031.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN G-CoCr25NiW This grade’s own name](/materials/din-en/g-cocr25niw "DIN / EN G-CoCr25NiW") ## 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 - [G-CoCr25NiW This grade’s own name](/materials/din-en/g-cocr25niw "DIN / EN G-CoCr25NiW") UNS United States · 1 - **R30031 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 8 elements on file · weight % What this alloy is Fe Cr Ni W Iron — the balance, never listed by a standard — 54 % Cr — 25.5 % Ni — 10.5 % W — 7.5 % Traces & impurities · 2.5 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.45–0.55 — Unusual | | Si | ≤ 1 | | Mn | ≤ 1 | | Cr | 24.5–26.5 | | Ni | 9.5–11.5 | | W | 7–8 | | Co | Balance | | Fe | ≤ 2 | Carbon Silicon Manganese Chromium Nickel Tungsten Cobalt 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 | 0,45-0,55 | 0.450 | 0.550 | Range | | Si | ≤1,00 | — | 1.000 | Max | | Cr | 24,5-26,5 | 24.500 | 26.500 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Fe | ≤2,00 | — | 2.000 | Max | | Co | Rest/Bal. | 49.450 | 58.550 | Balance | | Ni | 9,50-11,5 | 9.500 | 11.500 | Range | | W | 7,00-8,00 | 7.000 | 8.000 | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: 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. ## 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 0.63 - ΔCr 0.00 - 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=e4fb7e79-99ea-458c-b7f4-5b0a51b9b005&designation=f1f6565a-cdcf-468d-a70f-96948798f8bf "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/r30031.pdf "Datasheet as PDF")