--- title: "6418 — composition, equivalents and standards" description: "6418 is a designation in SAE AMS for the grade also listed as K32550. Designations recorded for this grade: 4." canonical: https://steelequivalents.com/materials/ams/6418 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/ams/6418.md cs: https://steelequivalents.com/cs/materiály/ams/6418.md de: https://steelequivalents.com/de/werkstoffe/ams/6418.md es: https://steelequivalents.com/es/materiales/ams/6418.md fr: https://steelequivalents.com/fr/matériaux/ams/6418.md hu: https://steelequivalents.com/hu/anyagok/ams/6418.md it: https://steelequivalents.com/it/materiali/ams/6418.md nl: https://steelequivalents.com/nl/materialen/ams/6418.md pl: https://steelequivalents.com/pl/materiały/ams/6418.md pt: https://steelequivalents.com/pt/materiais/ams/6418.md ru: https://steelequivalents.com/ru/материалы/ams/6418.md tr: https://steelequivalents.com/tr/malzemeler/ams/6418.md zh: https://steelequivalents.com/zh/材料/ams/6418.md ja: https://steelequivalents.com/ja/材料/ams/6418.md ar: https://steelequivalents.com/ar/المواد/ams/6418.md ko: https://steelequivalents.com/ko/재료/ams/6418.md pt-br: https://steelequivalents.com/pt-br/materiais/ams/6418.md hi: https://steelequivalents.com/hi/सामग्री/ams/6418.md content_hash: sha256:2d779b4e7f83ce276cfaf60dfd25393b1e140f93cc7816fd7c8452f6600c782c 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/ams/6418 > Canonical URL: https://steelequivalents.com/materials/ams/6418 > 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. SAE AMS · United States / Aerospace · 4 designations # 6418 6418 is a designation in SAE AMS for the grade also listed as K32550. We list 4 designations recorded for this grade, in the standards UNS, ASTM and SAE AMS. - *Designations* **4** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=3d112b27-e842-4e03-a649-676717ea4cef&designation=0a98f26d-ff8b-4a82-a0e5-aac1d6435231 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ams/6418.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [UNS K32550 This grade’s own name](/materials/uns/k32550 "UNS K32550") ## Also known as 4 designations · 3 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 - [K32550 This grade’s own name](/materials/uns/k32550 "UNS K32550") ASTM United States · 1 - [A322 Indicative](/materials/astm/a322 "ASTM A322") SAE AMS United States / Aerospace · 2 - **6418 Indicative** - [6425 Indicative](/materials/ams/6425 "SAE AMS 6425") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Predicted transformation temperatures Not enough recorded composition to predict a transformation temperature for this grade — missing: C, Mn, Si, Ni, Cr, Mo. ## Physical & mechanical properties 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. ## 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=3d112b27-e842-4e03-a649-676717ea4cef&designation=0a98f26d-ff8b-4a82-a0e5-aac1d6435231 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ams/6418.pdf "Datasheet as PDF")