--- title: "F1684-06 — Controlled-expansion nickel-iron alloys" description: "F1684-06 in ASTM: material number 1.3912, also listed as Ni36. It is a material in the category Controlled-expansion nickel-iron alloys." canonical: https://steelequivalents.com/materials/astm/f1684-06 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/astm/f1684-06.md cs: https://steelequivalents.com/cs/materiály/astm/f1684-06.md de: https://steelequivalents.com/de/werkstoffe/astm/f1684-06.md es: https://steelequivalents.com/es/materiales/astm/f1684-06.md fr: https://steelequivalents.com/fr/matériaux/astm/f1684-06.md hu: https://steelequivalents.com/hu/anyagok/astm/f1684-06.md it: https://steelequivalents.com/it/materiali/astm/f1684-06.md nl: https://steelequivalents.com/nl/materialen/astm/f1684-06.md pl: https://steelequivalents.com/pl/materiały/astm/f1684-06.md pt: https://steelequivalents.com/pt/materiais/astm/f1684-06.md ru: https://steelequivalents.com/ru/материалы/astm/f1684-06.md tr: https://steelequivalents.com/tr/malzemeler/astm/f1684-06.md zh: https://steelequivalents.com/zh/材料/astm/f1684-06.md ja: https://steelequivalents.com/ja/材料/astm/f1684-06.md ar: https://steelequivalents.com/ar/المواد/astm/f1684-06.md ko: https://steelequivalents.com/ko/재료/astm/f1684-06.md pt-br: https://steelequivalents.com/pt-br/materiais/astm/f1684-06.md hi: https://steelequivalents.com/hi/सामग्री/astm/f1684-06.md content_hash: sha256:f7c68dc049e959805a2dae411fb993255f4393b6263ea646c83fe04d418ee87e 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/astm/f1684-06 > Canonical URL: https://steelequivalents.com/materials/astm/f1684-06 > 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. ASTM · United States · 10 designations # F1684-06 F1684-06 is a designation in ASTM for the material held under material number 1.3912, also listed as Ni36. It is a material in the category Controlled-expansion nickel-iron alloys. We list 10 designations recorded for this grade, in the standards DIN / EN, UNS, ASTM, ČSN and SRPS. - [*Material no.* **1.3912**](/materials/material-no/1.3912 "Material no.: 1.3912") - [*Category* **Controlled-expansion nickel-iron alloys · 15 grades**](/categories/controlled-expansion-nickel-iron-alloys "Category: Controlled-expansion nickel-iron alloys · 15 grades") - *Designations* **10** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=1a6c5edf-1168-4135-8eb8-ed5bba73bf18&designation=7cc641c7-ea9e-440d-968f-1e37d1ba6638 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/astm/f1684-06.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN Ni36 This grade’s own name · 2 grades on that route](/materials/din-en/ni36 "DIN / EN Ni36") - [UNS K93600 This grade’s own name](/materials/uns/k93600 "UNS K93600") ## About Controlled-expansion nickel-iron alloys Controlled-expansion nickel-iron alloys are materials formulated to provide predictable thermal expansion and good dimensional stability. They are used for glass-to-metal seals, electronic packages and precision instruments where limiting thermal mismatch is important. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 10 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 - [Ni36 This grade’s own name](/materials/din-en/ni36 "DIN / EN Ni36") UNS United States · 3 - [K93600 This grade’s own name](/materials/uns/k93600 "UNS K93600") - [K93601 This grade’s own name](/materials/uns/k93601 "UNS K93601") - [K93603 Indicative](/materials/uns/k93603 "UNS K93603") ASTM United States · 4 - [B 388 Indicative](/materials/astm/b-388 "ASTM B 388") - [B 753 Indicative](/materials/astm/b-753 "ASTM B 753") - [F1684 Indicative](/materials/astm/f1684 "ASTM F1684") - **F1684-06 Indicative** ČSN Czechia · 1 - [17 536 Indicative](/materials/csn/17536 "ČSN 17 536") SRPS Serbia · 1 - [Č.5160 Indicative](/materials/srps/c-5160 "SRPS Č.5160") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 5 elements on file · weight % What this alloy is Fe Ni Mn Iron — the balance, never listed by a standard — 63.5 % Ni — 36 % Mn — 0.5 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤0,10\\n(≤0,05) | | Si | ≤0,50\\n(≤0,03) | | Mn | ≤ 0.5 | | Ni | 35–37 | | Fe | Balance | Carbon Silicon Manganese Nickel Iron 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 | ≤0,10\\n(≤0,05) | — | — | No numeric bound | | Si | ≤0,50\\n(≤0,03) | — | — | No numeric bound | | Mn | ≤0,50 | — | 0.500 | Max | | Fe | Rest/Bal. | — | — | Balance | | Ni | 35,0-37,0 | 35.000 | 37.000 | 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: C, Si, Cr, Mo. ## Physical & mechanical properties Density 8,2 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. ## 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=1a6c5edf-1168-4135-8eb8-ed5bba73bf18&designation=7cc641c7-ea9e-440d-968f-1e37d1ba6638 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/astm/f1684-06.pdf "Datasheet as PDF")