--- title: "G-X8Ni9 — Low-temperature structural steels" description: "G-X8Ni9: 16 equivalent designations across 7 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/g-x8ni9 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/g-x8ni9.md cs: https://steelequivalents.com/cs/materiály/din-en/g-x8ni9.md de: https://steelequivalents.com/de/werkstoffe/din-en/g-x8ni9.md es: https://steelequivalents.com/es/materiales/din-en/g-x8ni9.md fr: https://steelequivalents.com/fr/matériaux/din-en/g-x8ni9.md hu: https://steelequivalents.com/hu/anyagok/din-en/g-x8ni9.md it: https://steelequivalents.com/it/materiali/din-en/g-x8ni9.md nl: https://steelequivalents.com/nl/materialen/din-en/g-x8ni9.md pl: https://steelequivalents.com/pl/materiały/din-en/g-x8ni9.md pt: https://steelequivalents.com/pt/materiais/din-en/g-x8ni9.md ru: https://steelequivalents.com/ru/материалы/din-en/g-x8ni9.md tr: https://steelequivalents.com/tr/malzemeler/din-en/g-x8ni9.md zh: https://steelequivalents.com/zh/材料/din-en/g-x8ni9.md ja: https://steelequivalents.com/ja/材料/din-en/g-x8ni9.md ar: https://steelequivalents.com/ar/المواد/din-en/g-x8ni9.md ko: https://steelequivalents.com/ko/재료/din-en/g-x8ni9.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/g-x8ni9.md hi: https://steelequivalents.com/hi/सामग्री/din-en/g-x8ni9.md content_hash: sha256:a29bd8c1c14bc5f7339e6e0eaa3ea9cba05982f84aa1ebd66d72096bb0b59e3b 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/din-en/g-x8ni9 > Canonical URL: https://steelequivalents.com/materials/din-en/g-x8ni9 > 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. DIN / EN · Europe · 16 designations # G-X8Ni9 G-X8Ni9 is a material in the category [Low-temperature structural steels](/categories/low-temperature-structural-steels "Low-temperature structural steels"), held under material number 1.5662. We list 15 designations recorded for this grade, in the standards DIN / EN, AISI / SAE, ASTM, BS, AFNOR, UNE and UNI. Its recorded composition includes C ≤ 0.1%, Si ≤ 0.5%, P 0.025%, Mn 0.5–0.7% and Ni 8.5–9.5%. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.5662**](/materials/material-no/1.5662 "Material no.: 1.5662") - [*Category* **Low-temperature structural steels · 55 grades**](/categories/low-temperature-structural-steels "Category: Low-temperature structural steels · 55 grades") - *Designations* **16** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=bbcadb7d-dc1e-448a-aa43-cfadba972860&designation=cd4d8878-fad2-4688-8687-7069e0958a6a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/g-x8ni9.pdf "Datasheet as PDF") ## About Low-temperature structural steels Low-temperature structural steels are structural steels designed to retain toughness and reliable load-bearing performance in cold service. Their resistance to brittle fracture at low temperatures makes them suitable for structures, pressure-containing equipment and other components exposed to severe cold. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 16 designations · 7 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 · 4 - [1.5662 Indicative](/materials/material-no/1.5662 "DIN / EN 1.5662") - **G-X8Ni9 This grade’s own name** - [X8Ni9 Indicative](/materials/din-en/x8ni9 "DIN / EN X8Ni9") - [Z8N09 Indicative](/materials/din-en/z8n09 "DIN / EN Z8N09") AISI / SAE United States · 2 - [A353 Indicative](/materials/aisi-sae/a353 "AISI / SAE A353") - [ASTM A353 Indicative](/materials/aisi-sae/astm-a353 "AISI / SAE ASTM A353") ASTM United States · 1 - [A353 Indicative](/materials/aisi-sae/a353 "ASTM A353") BS United Kingdom · 3 - [1501-509 Indicative](/materials/bs/1501-509 "BS 1501-509") - [1501-509-510 Indicative](/materials/bs/1501-509-510 "BS 1501-509-510") - [510 Indicative](/materials/bs/510 "BS 510") AFNOR France · 3 - [9Ni490 Indicative](/materials/afnor/9ni490 "AFNOR 9Ni490") - [Z8N09 Indicative](/materials/din-en/z8n09 "AFNOR Z8N09") - [Z8N9 Indicative](/materials/afnor/z8n9 "AFNOR Z8N9") UNE Spain · 2 - [F.2645 Indicative](/materials/une/f-2645 "UNE F.2645") - [XBNi09 Indicative](/materials/une/xbni09 "UNE XBNi09") UNI Italy · 1 - [X10Ni9 Indicative](/materials/din-en/x10ni9 "UNI X10Ni9") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 6 elements on file · weight % What this alloy is Fe Ni Mn Si Iron — the balance, never listed by a standard — 89.8 % Ni — 9 % Mn — 0.6 % Si — 0.5 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.1 | | Si | ≤ 0.5 | | Mn | 0.5–0.7 | | P | 0.025 | | S | 0.01 | | Ni | 8.5–9.5 | Carbon Silicon Manganese Phosphorus Sulfur Nickel 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 | | Si | ≤0,50 | — | 0.500 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,01 | 0.010 | 0.010 | Exact | | Mn | 0,50-0,70 | 0.500 | 0.700 | Range | | Ni | 8,50-9,50 | 8.500 | 9.500 | 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: Cr, 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 1.5, a shared category, and a published range for Ni / Mn 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. [X10Ni9 1.5682 Ni 8,50-9,50 · Mn 0,30-0,80 - ΔNi 0.00 - ΔMn 0.05 - 1 designations](/materials/din-en/x10ni9 "X10Ni9")[1.5662 1.5662 Ni 8,50-10,0 · Mn 0,30-0,80 - ΔNi 0.25 - ΔMn 0.05 - 18 designations](/materials/material-no/1.5662 "1.5662")[X7Ni9 1.5663 Ni 8,50-10,0 · Mn 0,30-0,80 - ΔNi 0.25 - ΔMn 0.05 - 2 designations](/materials/din-en/x7ni9 "X7Ni9") ## 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=bbcadb7d-dc1e-448a-aa43-cfadba972860&designation=cd4d8878-fad2-4688-8687-7069e0958a6a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/g-x8ni9.pdf "Datasheet as PDF")