--- title: "821 grade Nb — Cast stainless steels" description: "821 grade Nb in BS: material number 1.4552, also listed as G-X 5 CrNiNb 18 9. Category: Cast stainless steels. Designations recorded for this grade: 15." canonical: https://steelequivalents.com/materials/bs/821-grade-nb language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/bs/821-grade-nb.md cs: https://steelequivalents.com/cs/materiály/bs/821-grade-nb.md de: https://steelequivalents.com/de/werkstoffe/bs/821-grade-nb.md es: https://steelequivalents.com/es/materiales/bs/821-grade-nb.md fr: https://steelequivalents.com/fr/matériaux/bs/821-grade-nb.md hu: https://steelequivalents.com/hu/anyagok/bs/821-grade-nb.md it: https://steelequivalents.com/it/materiali/bs/821-grade-nb.md nl: https://steelequivalents.com/nl/materialen/bs/821-grade-nb.md pl: https://steelequivalents.com/pl/materiały/bs/821-grade-nb.md pt: https://steelequivalents.com/pt/materiais/bs/821-grade-nb.md ru: https://steelequivalents.com/ru/материалы/bs/821-grade-nb.md tr: https://steelequivalents.com/tr/malzemeler/bs/821-grade-nb.md zh: https://steelequivalents.com/zh/材料/bs/821-grade-nb.md ja: https://steelequivalents.com/ja/材料/bs/821-grade-nb.md ar: https://steelequivalents.com/ar/المواد/bs/821-grade-nb.md ko: https://steelequivalents.com/ko/재료/bs/821-grade-nb.md pt-br: https://steelequivalents.com/pt-br/materiais/bs/821-grade-nb.md hi: https://steelequivalents.com/hi/सामग्री/bs/821-grade-nb.md content_hash: sha256:7779a0ca483e9d029cd8e9946170e0bfae6e95ca3cdd27600d10f6f7d8b93e1e 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/bs/821-grade-nb > Canonical URL: https://steelequivalents.com/materials/bs/821-grade-nb > 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. BS · United Kingdom · 15 designations # 821 grade Nb 821 grade Nb is a designation in BS for the material held under material number 1.4552, also listed as G-X 5 CrNiNb 18 9. It is a material in the category Cast stainless steels. We list 15 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, SAE AMS and JIS. - [*Material no.* **1.4552**](/materials/material-no/1.4552 "Material no.: 1.4552") - [*Category* **Cast stainless steels · 87 grades**](/categories/cast-stainless-steels "Category: Cast stainless steels · 87 grades") - *Designations* **15** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=4f6d89c9-0fb7-458f-bdef-84a49a2e3c7d&designation=f6a74c5c-ba34-4204-8769-f5f28939e8ec "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/821-grade-nb.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN GX5CrNiNb19-11 This grade’s own name](/materials/din-en/gx5crninb19-11 "DIN / EN GX5CrNiNb19-11") - [UNS J92640 This grade’s own name](/materials/uns/j92640 "UNS J92640") - [AISI / SAE 347 This grade’s own name · 4 grades on that route](/materials/aisi-sae/347 "AISI / SAE 347") ## About Cast stainless steels Cast stainless steels are stainless-steel materials produced by casting, combining corrosion resistance with the ability to form complex component shapes. Their composition and mechanical behaviour vary by grade, and they are used for corrosion-resistant cast components such as pumps, valves and process equipment. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 15 designations · 8 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 · 2 - [G-X 5 CrNiNb 18 9 This grade’s own name Withdrawn](/materials/din-en/g-x-5-crninb-18-9 "DIN / EN G-X 5 CrNiNb 18 9") - [GX5CrNiNb19-11 This grade’s own name](/materials/din-en/gx5crninb19-11 "DIN / EN GX5CrNiNb19-11") UNS United States · 2 - [J92640 This grade’s own name](/materials/uns/j92640 "UNS J92640") - [J92710 This grade’s own name](/materials/uns/j92710 "UNS J92710") AISI / SAE United States · 3 - [347 This grade’s own name](/materials/aisi-sae/347 "AISI / SAE 347") - [J92640 Indicative](/materials/uns/j92640 "AISI / SAE J92640") - [J92710 Indicative](/materials/uns/j92710 "AISI / SAE J92710") BS United Kingdom · 2 - [347 C 17 Indicative](/materials/bs/347c17 "BS 347 C 17") - **821 grade Nb Indicative** AFNOR France · 1 - [Z4CNNb19.10M Indicative](/materials/afnor/z4cnnb19-10m "AFNOR Z4CNNb19.10M") UNE Spain · 2 - [AM-X7 CrNiNb 20 10 Indicative](/materials/une/am-x7-crninb-20-10 "UNE AM-X7 CrNiNb 20 10") - [F.8413 Indicative](/materials/une/f-8413 "UNE F.8413") SAE AMS United States / Aerospace · 1 - [5362 Indicative](/materials/ams/5362 "SAE AMS 5362") JIS Japan · 2 - [SCS 21 Indicative](/materials/jis/scs21 "JIS SCS 21") - [SCS 21X Indicative](/materials/jis/scs21x "JIS SCS 21X") 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 Si Iron — the balance, never listed by a standard — 66.9 % Cr — 19 % Ni — 10.5 % Si — 1.5 % Traces & impurities · 2.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.07 | | Si | ≤ 1.5 | | Mn | ≤ 1.5 | | P | 0.04 | | S | 0.03 | | Cr | 18–20 | | Ni | 9–12 | | Cu | ≤ 0.5 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel Copper 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 | ≤1,50 | — | 1.500 | Max | | P | 0,04 | 0.040 | 0.040 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Cr | 18,0-20,0 | 18.000 | 20.000 | Range | | Mn | ≤1,50 | — | 1.500 | Max | | Ni | 9,00-12,0 | 9.000 | 12.000 | Range | | Cu | ≤0,50 | — | 0.500 | Max | - 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 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 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. [GX2CrNi19-11 1.4309 Cr 18,0-20,0 · Ni 9,00-12,0 - ΔCr 0.00 - ΔNi 0.00 - 13 designations](/materials/din-en/gx2crni19-11 "GX2CrNi19-11")[1.4408 1.4408 Cr 18,0-20,0 · Ni 9,00-12,0 - ΔCr 0.00 - ΔNi 0.00 - 17 designations](/materials/material-no/1.4408 "1.4408")[GX2CrNiMo19-11-2 1.4409 Cr 18,0-20,0 · Ni 9,00-12,0 - ΔCr 0.00 - ΔNi 0.00 - 11 designations](/materials/din-en/gx2crnimo19-11-2 "GX2CrNiMo19-11-2")[1.4581 1.4581 Cr 18,0-20,0 · Ni 9,00-12,0 - ΔCr 0.00 - ΔNi 0.00 - 16 designations](/materials/material-no/1.4581 "1.4581")[GX8CrNi19-10 1.4815 Cr 18,0-20,0 · Ni 9,00-11,0 - ΔCr 0.00 - ΔNi 0.50 - 3 designations](/materials/din-en/gx8crni19-10 "GX8CrNi19-10")[1.4308 1.4308 Cr 18,0-20,0 · Ni 8,00-11,0 - ΔCr 0.00 - ΔNi 1.00 - 29 designations](/materials/material-no/1.4308 "1.4308") ## 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=4f6d89c9-0fb7-458f-bdef-84a49a2e3c7d&designation=f6a74c5c-ba34-4204-8769-f5f28939e8ec "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/821-grade-nb.pdf "Datasheet as PDF")