--- title: "1.4956 — X7CrNiCo21-20-20, 6 equivalent designations" description: "1.4956 is the material number of the grade also listed as X7CrNiCo21-20-20. It is a material in the category Others. Designations recorded for this grade: 6." canonical: https://steelequivalents.com/materials/material-no/1.4956 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.4956.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.4956.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.4956.md es: https://steelequivalents.com/es/materiales/número-de-material/1.4956.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.4956.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.4956.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.4956.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.4956.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.4956.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.4956.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.4956.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.4956.md zh: https://steelequivalents.com/zh/材料/材料编号/1.4956.md ja: https://steelequivalents.com/ja/材料/材料番号/1.4956.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.4956.md ko: https://steelequivalents.com/ko/재료/재료번호/1.4956.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.4956.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.4956.md content_hash: sha256:c26cd008fadec5e9830238003750fb39a220627fc2f2df4b2a1a62671b3867fc 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/1.4956 > Canonical URL: https://steelequivalents.com/materials/material-no/1.4956 > 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 · 6 designations # 1.4956 1.4956 is the material number of the grade also listed as X7CrNiCo21-20-20. It is a material in the category Others. We list 6 designations recorded for this grade, in the standards DIN / EN, UNS and SAE AMS. - ***Material no.* **1.4956**** - [*Category* **Others · 1754 grades**](/categories/others "Category: Others · 1754 grades") - *Designations* **6** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=ce4c4289-8f6b-41b7-8a4b-6a63b439bc58 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.4956.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN X7CrNiCo21-20-20 This grade’s own name](/materials/din-en/x7crnico21-20-20 "DIN / EN X7CrNiCo21-20-20") ## About Others These are miscellaneous metallic alloys that do not fit a more specific material family and may be based on iron, nickel, cobalt, copper or other alloy systems. They are selected for applications requiring particular combinations of strength, hardness, toughness, wear resistance or resistance to demanding service conditions. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 6 designations · 3 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 - [X7CrNiCo21-20-20 This grade’s own name](/materials/din-en/x7crnico21-20-20 "DIN / EN X7CrNiCo21-20-20") UNS United States · 1 - [R30155 Indicative](/materials/uns/r30155 "UNS R30155") SAE AMS United States / Aerospace · 4 - [5532 Indicative plate sheet strip](/materials/ams/5532 "SAE AMS 5532") - [5769 Indicative bar forging ring](/materials/ams/5769 "SAE AMS 5769") - [5794 Indicative wire](/materials/ams/5794 "SAE AMS 5794") - [5795 Indicative](/materials/ams/5795 "SAE AMS 5795") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 12 elements on file · weight % What this alloy is Fe Cr Ni Co Iron — the balance, never listed by a standard — 29.7 % Cr — 21.3 % Ni — 20 % Co — 19.8 % Traces & impurities · 9.3 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.1 | | Si | ≤ 1 | | Mn | 1–2 | | P | 0.03 | | S | 0.02 | | Cr | 20–22.5 | | Mo | 2.5–3.5 | | Ni | 19–21 | | W | 2–3 | | Co | 18.5–21 | | Nb | 0.75–1.25 | | N | 0.1–0.2 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Tungsten Cobalt Niobium Nitrogen 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 | ≤0,10 | — | 0.100 | Max | | N | 0,10-0,20 | 0.100 | 0.200 | Range | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,02 | 0.020 | 0.020 | Exact | | Cr | 20,0-22,5 | 20.000 | 22.500 | Range | | Mn | 1,00-2,00 | 1.000 | 2.000 | Range | | Co | 18,5-21,0 | 18.500 | 21.000 | Range | | Ni | 19,0-21,0 | 19.000 | 21.000 | Range | | Nb | 0,75-1,25 | 0.750 | 1.250 | Range | | Mo | 2,50-3,50 | 2.500 | 3.500 | Range | | W | 2,00-3,00 | 2.000 | 3.000 | 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 1.4, a shared category, and a published range for Cr / 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. [GX50NiCrCo20-20-20 1.4874 Cr 19,0-22,0 · Ni 18,0-22,0 - ΔCr 0.75 - ΔNi 0.00 - 1 designations](/materials/din-en/gx50nicrco20-20-20 "GX50NiCrCo20-20-20")[X8CrNiAlTi20-20 1.4847 Cr 18,0-22,0 · Ni 18,0-22,0 - ΔCr 1.25 - ΔNi 0.00 - 3 designations](/materials/din-en/x8crnialti20-20 "X8CrNiAlTi20-20")[X 40 CoCrNi 20 20 1.4977 Cr 19,0-21,0 · Ni 19,0-21,0 - ΔCr 1.25 - ΔNi 0.00 - 2 designations](/materials/din-en/x-40-cocrni-20-20 "X 40 CoCrNi 20 20")[X 50 CoCrNi 20 20 1.4978 Cr 19,0-21,0 · Ni 19,0-21,0 - ΔCr 1.25 - ΔNi 0.00 - 1 designations](/materials/din-en/x-50-cocrni-20-20 "X 50 CoCrNi 20 20")[GX2CrNiMoCuN20-18-6 1.4557 Cr 19,5-20,5 · Ni 17,5-19,5 - ΔCr 1.25 - ΔNi 1.50 - 9 designations](/materials/din-en/gx2crnimocun20-18-6 "GX2CrNiMoCuN20-18-6")[X1NiCrMoCu22-20-5-2 1.4656 Cr 19,0-21,0 · Ni 21,0-23,0 - ΔCr 1.25 - ΔNi 2.00 - 3 designations](/materials/din-en/x1nicrmocu22-20-5-2 "X1NiCrMoCu22-20-5-2") ## 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=ce4c4289-8f6b-41b7-8a4b-6a63b439bc58 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.4956.pdf "Datasheet as PDF")