--- title: "S17780 — S17700, 17 equivalent designations" description: "S17780 in UNS: material number 1.4504, also listed as S17700. It is a material in the category Others. Designations recorded for this grade: 17." canonical: https://steelequivalents.com/materials/uns/s17780 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uns/s17780.md cs: https://steelequivalents.com/cs/materiály/uns/s17780.md de: https://steelequivalents.com/de/werkstoffe/uns/s17780.md es: https://steelequivalents.com/es/materiales/uns/s17780.md fr: https://steelequivalents.com/fr/matériaux/uns/s17780.md hu: https://steelequivalents.com/hu/anyagok/uns/s17780.md it: https://steelequivalents.com/it/materiali/uns/s17780.md nl: https://steelequivalents.com/nl/materialen/uns/s17780.md pl: https://steelequivalents.com/pl/materiały/uns/s17780.md pt: https://steelequivalents.com/pt/materiais/uns/s17780.md ru: https://steelequivalents.com/ru/материалы/uns/s17780.md tr: https://steelequivalents.com/tr/malzemeler/uns/s17780.md zh: https://steelequivalents.com/zh/材料/uns/s17780.md ja: https://steelequivalents.com/ja/材料/uns/s17780.md ar: https://steelequivalents.com/ar/المواد/uns/s17780.md ko: https://steelequivalents.com/ko/재료/uns/s17780.md pt-br: https://steelequivalents.com/pt-br/materiais/uns/s17780.md hi: https://steelequivalents.com/hi/सामग्री/uns/s17780.md content_hash: sha256:39aa6305b31e9a819d379100a0986c28c0fc2b581edacb8540019cf477f5e7c5 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/uns/s17780 > Canonical URL: https://steelequivalents.com/materials/uns/s17780 > 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. UNS · United States · 17 designations # S17780 S17780 is a designation in UNS for the material held under material number 1.4504, also listed as S17700. It is a material in the category Others. We list 17 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM and SAE AMS. - [*Material no.* **1.4504**](/materials/material-no/1.4504 "Material no.: 1.4504") - [*Category* **Others · 1754 grades**](/categories/others "Category: Others · 1754 grades") - *Designations* **17** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=54f99435-a611-4679-8a2b-6538d350a726&designation=f5b527df-2b9b-462b-9efa-2637751280ed "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/s17780.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [UNS S17700 This grade’s own name · 3 grades on that route](/materials/uns/s17700 "UNS S17700") - [AISI / SAE 631 This grade’s own name · 3 grades on that route](/materials/aisi-sae/631 "AISI / SAE 631") ## 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 17 designations · 5 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 - [1.4504 Indicative](/materials/material-no/1.4504 "DIN / EN 1.4504") UNS United States · 2 - [S17700 This grade’s own name](/materials/uns/s17700 "UNS S17700") - **S17780 This grade’s own name** AISI / SAE United States · 2 - [17-7PH Indicative](/materials/aisi-sae/17-7ph "AISI / SAE 17-7PH") - [631 This grade’s own name](/materials/aisi-sae/631 "AISI / SAE 631") ASTM United States · 6 - [A 313 Indicative](/materials/astm/a313 "ASTM A 313") - [A 564 Indicative](/materials/astm/a564 "ASTM A 564") - [A 564 Type 631 Indicative](/materials/astm/a-564-type-631 "ASTM A 564 Type 631") - [A 579 Indicative](/materials/astm/a579 "ASTM A 579") - [A 693 Indicative](/materials/astm/a693 "ASTM A 693") - [A 705 Indicative](/materials/astm/a705 "ASTM A 705") SAE AMS United States / Aerospace · 6 - [5528 Indicative plate sheet strip](/materials/ams/5528 "SAE AMS 5528") - [5529 Indicative sheet strip](/materials/ams/5529 "SAE AMS 5529") - [5568 Indicative tubing](/materials/ams/5568 "SAE AMS 5568") - [5644 Indicative bar forging](/materials/ams/5644 "SAE AMS 5644") - [5678 Indicative wire](/materials/ams/5678 "SAE AMS 5678") - [5824 Indicative wire](/materials/ams/5824 "SAE AMS 5824") 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 Mn Iron — the balance, never listed by a standard — 73.6 % Cr — 16.6 % Ni — 7.1 % Mn — 1 % Traces & impurities · 1.6 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.09 | | Si | ≤ 0.5 | | Mn | ≤ 1 | | P | 0.025 | | S | 0.025 | | Cr | 16–17.25 | | Ni | 6.5–7.75 | | Al | 0.75–1.25 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel Aluminium 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 | ≤0,09 | — | 0.090 | Max | | Al | 0,75-1,25 | 0.750 | 1.250 | Range | | Si | ≤0,50 | — | 0.500 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,025 | 0.025 | 0.025 | Exact | | Cr | 16,0-17,25 | 16.000 | 17.250 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Ni | 6,50-7,75 | 6.500 | 7.750 | 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: 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. [X6CrNiMnCu17-8-4-2 1.4617 Cr 15,0-18,0 · Ni 6,00-9,00 - ΔCr 0.13 - ΔNi 0.38 - 1 designations](/materials/din-en/x6crnimncu17-8-4-2 "X6CrNiMnCu17-8-4-2")[GX5CrNiMoNb23-9 1.4572 Cr ≤23,0 · Ni ≤9,50 - ΔCr 5.13 - ΔNi 2.38 - 1 designations](/materials/din-en/gx5crnimonb23-9 "GX5CrNiMoNb23-9") ## 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=54f99435-a611-4679-8a2b-6538d350a726&designation=f5b527df-2b9b-462b-9efa-2637751280ed "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/s17780.pdf "Datasheet as PDF")