--- title: "1.8780 — High-strength steels" description: "1.8780 is the material number of the grade also listed as S800QL1. Category: High-strength steels. Designations recorded for this grade: 1." canonical: https://steelequivalents.com/materials/material-no/1.8780 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.8780.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.8780.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.8780.md es: https://steelequivalents.com/es/materiales/número-de-material/1.8780.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.8780.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.8780.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.8780.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.8780.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.8780.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.8780.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.8780.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.8780.md zh: https://steelequivalents.com/zh/材料/材料编号/1.8780.md ja: https://steelequivalents.com/ja/材料/材料番号/1.8780.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.8780.md ko: https://steelequivalents.com/ko/재료/재료번호/1.8780.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.8780.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.8780.md content_hash: sha256:0babcddbadedd9072044640793f8a93e5c00c846b0c90e967221af8c1531fde5 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/1.8780 > Canonical URL: https://steelequivalents.com/materials/material-no/1.8780 > 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 · 1 designation # 1.8780 1.8780 is the material number of the grade also listed as S800QL1. It is a material in the category High-strength steels. We list 1 designations recorded for this grade, in the standards DIN / EN. - ***Material no.* **1.8780**** - [*Category* **High-strength steels · 128 grades**](/categories/high-strength-steels "Category: High-strength steels · 128 grades") - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=44d26e1c-7891-40c2-b824-d4671fe47f93 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.8780.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN S800QL1 This grade’s own name](/materials/din-en/s800ql1 "DIN / EN S800QL1") ## About High-strength steels High-strength steels are steels designed to carry high loads while resisting deformation. They are used for load-bearing structures, vehicles and machinery where strength, durability and reduced material weight are important. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 1 designations · 1 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 - [S800QL1 This grade’s own name](/materials/din-en/s800ql1 "DIN / EN S800QL1") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 7 elements on file · weight % What this alloy is Fe Mn Cr Si Iron — the balance, never listed by a standard — 95.3 % Mn — 1.6 % Cr — 1.5 % Si — 0.8 % Traces & impurities · 0.8 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.2 | | Si | ≤ 0.8 | | Mn | ≤ 1.6 | | P | 0.02 | | S | 0.01 | | Cr | ≤ 1.5 | | Mo | ≤ 0.6 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum 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 | ≤0,20 | — | 0.200 | Max | | Si | ≤,80 | — | 0.800 | Max | | P | 0,02 | 0.020 | 0.020 | Exact | | S | 0,01 | 0.010 | 0.010 | Exact | | Cr | ≤1,50 | — | 1.500 | Max | | Mn | ≤1,60 | — | 1.600 | Max | | Mo | ≤0,60 | — | 0.600 | Max | 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: Ni. ## 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 1.8, a shared category, and a published range for Mn / 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. [S800QL 1.8770 Mn ≤1,60 · Cr ≤1,50 - ΔMn 0.00 - ΔCr 0.00 - 1 designations](/materials/din-en/s800ql "S800QL")[S890QL1 1.8925 Mn ≤1,70 · Cr ≤1,50 - ΔMn 0.05 - ΔCr 0.00 - 2 designations](/materials/din-en/s890ql1 "S890QL1")[FeE690VKT 1.8928 Mn ≤1,70 · Cr ≤1,50 - ΔMn 0.05 - ΔCr 0.00 - 17 designations](/materials/din-en/fee690vkt "FeE690VKT")[S690Q 1.8931 Mn ≤1,70 · Cr ≤1,50 - ΔMn 0.05 - ΔCr 0.00 - 5 designations](/materials/din-en/s690q "S690Q")[S960QL 1.8933 Mn ≤1,70 · Cr ≤1,50 - ΔMn 0.05 - ΔCr 0.00 - 4 designations](/materials/din-en/s960ql "S960QL")[S890QL 1.8983 Mn ≤1,70 · Cr ≤1,50 - ΔMn 0.05 - ΔCr 0.00 - 2 designations](/materials/din-en/s890ql "S890QL") ## 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=44d26e1c-7891-40c2-b824-d4671fe47f93 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.8780.pdf "Datasheet as PDF")