--- title: "Č.5161 — Controlled-expansion nickel-iron alloys" description: "Č.5161 in SRPS: material number 1.3917, also listed as Ni42. Category: Controlled-expansion nickel-iron alloys. Designations recorded for this grade: 6." canonical: https://steelequivalents.com/materials/srps/c-5161 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/srps/c-5161.md cs: https://steelequivalents.com/cs/materiály/srps/c-5161.md de: https://steelequivalents.com/de/werkstoffe/srps/c-5161.md es: https://steelequivalents.com/es/materiales/srps/c-5161.md fr: https://steelequivalents.com/fr/matériaux/srps/c-5161.md hu: https://steelequivalents.com/hu/anyagok/srps/c-5161.md it: https://steelequivalents.com/it/materiali/srps/c-5161.md nl: https://steelequivalents.com/nl/materialen/srps/c-5161.md pl: https://steelequivalents.com/pl/materiały/srps/c-5161.md pt: https://steelequivalents.com/pt/materiais/srps/c-5161.md ru: https://steelequivalents.com/ru/материалы/srps/c-5161.md tr: https://steelequivalents.com/tr/malzemeler/srps/c-5161.md zh: https://steelequivalents.com/zh/材料/srps/c-5161.md ja: https://steelequivalents.com/ja/材料/srps/c-5161.md ar: https://steelequivalents.com/ar/المواد/srps/c-5161.md ko: https://steelequivalents.com/ko/재료/srps/c-5161.md pt-br: https://steelequivalents.com/pt-br/materiais/srps/c-5161.md hi: https://steelequivalents.com/hi/सामग्री/srps/c-5161.md content_hash: sha256:434083dffe82ad2ab0e7ef84f68d5fe1e64ad900433fc271fae2318f22393ae7 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/srps/c-5161 > Canonical URL: https://steelequivalents.com/materials/srps/c-5161 > 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. SRPS · Serbia · 6 designations # Č.5161 Č.5161 is a designation in SRPS for the material held under material number 1.3917, also listed as Ni42. It is a material in the category Controlled-expansion nickel-iron alloys. We list 6 designations recorded for this grade, in the standards DIN / EN, UNS, ASTM, AFNOR and SRPS. - [*Material no.* **1.3917**](/materials/material-no/1.3917 "Material no.: 1.3917") - [*Category* **Controlled-expansion nickel-iron alloys · 15 grades**](/categories/controlled-expansion-nickel-iron-alloys "Category: Controlled-expansion nickel-iron alloys · 15 grades") - *Designations* **6** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=f20aa7e2-13d4-4bde-97bc-dd24e61ab15e&designation=266fa5c9-335d-4ae9-9fab-d10b5ca3bb15 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/srps/c-5161.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN Ni42 This grade’s own name](/materials/din-en/ni42 "DIN / EN Ni42") - [UNS K94100 This grade’s own name](/materials/uns/k94100 "UNS K94100") ## 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 6 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 - [Ni42 This grade’s own name](/materials/din-en/ni42 "DIN / EN Ni42") UNS United States · 1 - [K94100 This grade’s own name](/materials/uns/k94100 "UNS K94100") ASTM United States · 2 - [F29 Indicative](/materials/astm/f29 "ASTM F29") - [F30 Indicative](/materials/astm/f30 "ASTM F30") AFNOR France · 1 - [NF A54-301 Indicative](/materials/afnor/nf-a54-301 "AFNOR NF A54-301") SRPS Serbia · 1 - **Č.5161 Indicative** 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 Mn Si C Iron — the balance, never listed by a standard — 98.7 % Mn — 1 % Si — 0.3 % C — 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.05 | | Si | ≤ 0.3 | | Mn | ≤ 1 | | Ni | 41,0-43,0\\n(40,0-43,0) | | 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 | ≤0,05 | — | 0.050 | Max | | Si | ≤0,30 | — | 0.300 | Max | | Mn | ≤1,00 | — | 1.000 | Max | | Fe | Rest/Bal. | — | — | Balance | | Ni | 41,0-43,0\\n(40,0-43,0) | — | — | No numeric bound | 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, Cr, 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 1.3, a shared category, and a published range for Mn / Si 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. [Ni48 1.3922 Mn ≤0,50 · Si ≤0,30 - ΔMn 0.25 - ΔSi 0.00 - 4 designations](/materials/din-en/ni48 "Ni48") ## 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=f20aa7e2-13d4-4bde-97bc-dd24e61ab15e&designation=266fa5c9-335d-4ae9-9fab-d10b5ca3bb15 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/srps/c-5161.pdf "Datasheet as PDF")