--- title: "1.7766 — Hydrogen resistant steels" description: "1.7766 is the material number of the grade also listed as 17CrMoV10. Category: Hydrogen resistant steels. Designations recorded for this grade: 2." canonical: https://steelequivalents.com/materials/material-no/1.7766 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.7766.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.7766.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.7766.md es: https://steelequivalents.com/es/materiales/número-de-material/1.7766.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.7766.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.7766.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.7766.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.7766.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.7766.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.7766.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.7766.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.7766.md zh: https://steelequivalents.com/zh/材料/材料编号/1.7766.md ja: https://steelequivalents.com/ja/材料/材料番号/1.7766.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.7766.md ko: https://steelequivalents.com/ko/재료/재료번호/1.7766.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.7766.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.7766.md content_hash: sha256:ad69306e0f0b14f71fe9c2f5a84af4c20d9fec1a402a9655bcd09f48b235eeb4 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/1.7766 > Canonical URL: https://steelequivalents.com/materials/material-no/1.7766 > 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 · 2 designations # 1.7766 1.7766 is the material number of the grade also listed as 17CrMoV10. It is a material in the category Hydrogen resistant steels. We list 2 designations recorded for this grade, in the standards DIN / EN and ČSN. - ***Material no.* **1.7766**** - [*Category* **Hydrogen resistant steels · 8 grades**](/categories/hydrogen-resistant-steels "Category: Hydrogen resistant steels · 8 grades") - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=8af43350-9c1b-4b40-a705-a5c063ca3c08 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.7766.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 17CrMoV10 This grade’s own name](/materials/din-en/17crmov10 "DIN / EN 17CrMoV10") ## About Hydrogen resistant steels Hydrogen resistant steels are steels designed to withstand hydrogen-related damage, including hydrogen embrittlement and hydrogen attack. They are used for pressure vessels, piping and process equipment exposed to hydrogen-containing environments, where resistance to hydrogen ingress and loss of toughness is important. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 2 designations · 2 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 - [17CrMoV10 This grade’s own name](/materials/din-en/17crmov10 "DIN / EN 17CrMoV10") ČSN Czechia · 1 - [15323 Indicative](/materials/csn/15323 "ČSN 15323") 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 Mn Si Iron — the balance, never listed by a standard — 95.9 % Cr — 2.9 % Mn — 0.4 % Si — 0.3 % Traces & impurities · 0.6 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.15–0.2 | | Si | 0.15–0.35 | | Mn | 0.3–0.5 | | P | 0.035 | | S | 0.035 | | Cr | 2.7–3 | | Mo | 0.2–0.3 | | V | 0.1–0.2 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Vanadium 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 | 0,15-0,20 | 0.150 | 0.200 | Range | | Si | 0,15-0,35 | 0.150 | 0.350 | Range | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | V | 0,10-0,20 | 0.100 | 0.200 | Range | | Cr | 2,70-3,00 | 2.700 | 3.000 | Range | | Mn | 0,30-0,50 | 0.300 | 0.500 | Range | | Mo | 0,20-0,30 | 0.200 | 0.300 | 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: 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 1.7, a shared category, and a published range for Cr / 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. [10CrMo11 1.7276 Cr 2,70-3,00 · Mn 0,30-0,50 - ΔCr 0.00 - ΔMn 0.00 - 2 designations](/materials/din-en/10crmo11 "10CrMo11")[20CrMoV13-5-5 1.7779 Cr 3,00-3,30 · Mn 0,30-0,50 - ΔCr 0.30 - ΔMn 0.00 - 3 designations](/materials/din-en/20crmov13-5-5 "20CrMoV13-5-5") ## 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=8af43350-9c1b-4b40-a705-a5c063ca3c08 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.7766.pdf "Datasheet as PDF")