--- title: "1.4564 — Special steels for aviation and aerospace" description: "1.4564 is the material number of the grade also listed as S17700. It is a material in the category Special steels for aviation and aerospace." canonical: https://steelequivalents.com/materials/material-no/1.4564 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.4564.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.4564.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.4564.md es: https://steelequivalents.com/es/materiales/número-de-material/1.4564.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.4564.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.4564.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.4564.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.4564.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.4564.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.4564.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.4564.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.4564.md zh: https://steelequivalents.com/zh/材料/材料编号/1.4564.md ja: https://steelequivalents.com/ja/材料/材料番号/1.4564.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.4564.md ko: https://steelequivalents.com/ko/재료/재료번호/1.4564.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.4564.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.4564.md content_hash: sha256:c6bdafa79a531dd808a2601743708f5c0f3f68f6776158b51cca45197f49eefb 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/1.4564 > Canonical URL: https://steelequivalents.com/materials/material-no/1.4564 > 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 · 15 designations # 1.4564 1.4564 is the material number of the grade also listed as S17700. It is a material in the category Special steels for aviation and aerospace. We list 15 designations recorded for this grade, in the standards UNS, AISI / SAE, ASTM and SAE AMS. - ***Material no.* **1.4564**** - [*Category* **Special steels for aviation and aerospace · 39 grades**](/categories/special-steels-for-aviation-and-aerospace "Category: Special steels for aviation and aerospace · 39 grades") - *Designations* **15** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=40dc97cd-f47d-4592-bdc0-0045cc1ec097 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.4564.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 Special steels for aviation and aerospace Special steels for aviation and aerospace are engineered steels designed to provide controlled mechanical properties and reliable performance in demanding service. Their alloying and heat-treatment capabilities support components that require a combination of strength, toughness and fatigue resistance, including aircraft structures and engine parts. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 15 designations · 4 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. UNS United States · 1 - [S17700 This grade’s own name](/materials/uns/s17700 "UNS S17700") 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 9 elements on file · weight % What this alloy is Fe Cr Ni Al Iron — the balance, never listed by a standard — 72.1 % Cr — 17 % Ni — 7.1 % Al — 1.1 % Traces & impurities · 2.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.09 | | Si | ≤ 1 | | Mn | ≤ 1 | | P | 0.04 | | S | 0.03 | | Cr | 16–18 | | Ni | 6.5–7.75 | | Cu | ≤ 0.5 | | Al | 0.75–1.5 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel Copper 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 | 0,75-1,50 | 0.750 | 1.500 | Range | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,04 | 0.040 | 0.040 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Cr | 16,0-18,0 | 16.000 | 18.000 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Ni | 6,50-7,75 | 6.500 | 7.750 | Range | | Cu | ≤0,50 | — | 0.500 | 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: 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. [S30100 1.4324 Cr 16,0-18,0 · Ni 7,00-9,00 - ΔCr 0.00 - ΔNi 0.88 - 52 designations](/materials/uns/s30100 "S30100")[S15700 1.4574 Cr 14,0-16,0 · Ni 6,50-7,75 - ΔCr 2.00 - ΔNi 0.00 - 4 designations](/materials/uns/s15700 "S15700") ## 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=40dc97cd-f47d-4592-bdc0-0045cc1ec097 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.4564.pdf "Datasheet as PDF")