--- title: "B 473 — Nickel and cobalt alloys" description: "B 473 in ASTM: material number 2.4660, also listed as NiCr20CuMo. Category: Nickel and cobalt alloys. Designations recorded for this grade: 15." canonical: https://steelequivalents.com/materials/astm/b-473 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/astm/b-473.md cs: https://steelequivalents.com/cs/materiály/astm/b-473.md de: https://steelequivalents.com/de/werkstoffe/astm/b-473.md es: https://steelequivalents.com/es/materiales/astm/b-473.md fr: https://steelequivalents.com/fr/matériaux/astm/b-473.md hu: https://steelequivalents.com/hu/anyagok/astm/b-473.md it: https://steelequivalents.com/it/materiali/astm/b-473.md nl: https://steelequivalents.com/nl/materialen/astm/b-473.md pl: https://steelequivalents.com/pl/materiały/astm/b-473.md pt: https://steelequivalents.com/pt/materiais/astm/b-473.md ru: https://steelequivalents.com/ru/материалы/astm/b-473.md tr: https://steelequivalents.com/tr/malzemeler/astm/b-473.md zh: https://steelequivalents.com/zh/材料/astm/b-473.md ja: https://steelequivalents.com/ja/材料/astm/b-473.md ar: https://steelequivalents.com/ar/المواد/astm/b-473.md ko: https://steelequivalents.com/ko/재료/astm/b-473.md pt-br: https://steelequivalents.com/pt-br/materiais/astm/b-473.md hi: https://steelequivalents.com/hi/सामग्री/astm/b-473.md content_hash: sha256:e24bfab4c377cd327f16542971d2c68fdecbdb23dc6799bed61265e10ffd3f99 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/astm/b-473 > Canonical URL: https://steelequivalents.com/materials/astm/b-473 > 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. ASTM · United States · 15 designations # B 473 B 473 is a designation in ASTM for the material held under material number 2.4660, also listed as NiCr20CuMo. It is a material in the category Nickel and cobalt alloys. We list 15 designations recorded for this grade, in the standards DIN / EN, UNS, ASTM, ISO and GB. - [*Material no.* **2.4660**](/materials/material-no/2.4660 "Material no.: 2.4660") - [*Category* **Nickel and cobalt alloys · 87 grades**](/categories/nickel-and-cobalt-alloys "Category: Nickel and cobalt alloys · 87 grades") - *Designations* **15** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=b26e8fe4-2b47-4d6e-9481-6213317e2b02&designation=93d35aef-12bf-43dd-a150-56611e6e2f25 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/astm/b-473.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN NiCr20CuMo This grade’s own name](/materials/din-en/nicr20cumo "DIN / EN NiCr20CuMo") - [UNS N08020 This grade’s own name · 2 grades on that route](/materials/uns/n08020 "UNS N08020") ## 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 15 designations · 5 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 - [NiCr20CuMo This grade’s own name](/materials/din-en/nicr20cumo "DIN / EN NiCr20CuMo") UNS United States · 1 - [N08020 This grade’s own name](/materials/uns/n08020 "UNS N08020") ASTM United States · 9 - [A240 Indicative](/materials/astm/a240 "ASTM A240") - [B 366 Indicative](/materials/astm/b366 "ASTM B 366") - [B 463 Indicative](/materials/astm/b-463 "ASTM B 463") - [B 464 Indicative](/materials/astm/b-464 "ASTM B 464") - **B 473 Indicative** - [B462 Indicative](/materials/astm/b462 "ASTM B462") - [B468 Indicative](/materials/astm/b468 "ASTM B468") - [B729 Indicative](/materials/astm/b729 "ASTM B729") - [B775 Indicative](/materials/astm/b775 "ASTM B775") ISO International · 2 - [FeNi35Cr20Cu4Mo2 Indicative](/materials/iso/feni35cr20cu4mo2 "ISO FeNi35Cr20Cu4Mo2") - [NW8020 Indicative](/materials/iso/nw8020 "ISO NW8020") GB China · 2 - [H08020 Indicative](/materials/gb/h08020 "GB H08020") - [NS1403 Indicative](/materials/gb/ns1403 "GB NS1403") 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 Ni Cr Cu Iron — the balance, never listed by a standard — 34.4 % Ni — 35 % Cr — 20 % Cu — 3.5 % Traces & impurities · 7.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.07 | | Si | ≤ 1 | | Mn | ≤ 2 | | P | 0.025 | | S | 0.015 | | Cr | 19–21 | | Mo | 2–3 | | Ni | 32–38 | | Co | ≤ 1.5 | | Cu | 3–4 | | Fe | Balance | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Cobalt Copper 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 | ≤0,07 | — | 0.070 | Max | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 19,0-21,0 | 19.000 | 21.000 | Range | | Mn | ≤2,00 | — | 2.000 | Max | | Fe | Rest/Bal. | 29.390 | 43.960 | Balance | | Co | ≤1,50 | — | 1.500 | Max | | Ni | 32,0-38,0 | 32.000 | 38.000 | Range | | Cu | 3,00-4,00 | 3.000 | 4.000 | Range | | Mo | 2,00-3,00 | 2.000 | 3.000 | Range | - ≥8xC ≤1,00 - ≥8xC ≤1,00 - ≥8xC ≤1,00 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 8,1 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 Fe / Ni 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. [NiCr22W12Fe 2.4972 Fe Rest/Bal. · Ni 34,0-36,0 - ΔFe 7.27 - ΔNi 0.00 - 1 designations](/materials/din-en/nicr22w12fe "NiCr22W12Fe")[NiCr21Mo 2.4858 Fe Rest/Bal. · Ni 38,0-46,0 - ΔFe 7.72 - ΔNi 7.00 - 18 designations](/materials/din-en/nicr21mo "NiCr21Mo") ## 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=b26e8fe4-2b47-4d6e-9481-6213317e2b02&designation=93d35aef-12bf-43dd-a150-56611e6e2f25 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/astm/b-473.pdf "Datasheet as PDF")