--- title: "5665 — High-temperature steels" description: "5665 in SAE AMS: material number 2.4816, also listed as NiCr15Fe. Category: High-temperature steels. Designations recorded for this grade: 20." canonical: https://steelequivalents.com/materials/ams/5665 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/ams/5665.md cs: https://steelequivalents.com/cs/materiály/ams/5665.md de: https://steelequivalents.com/de/werkstoffe/ams/5665.md es: https://steelequivalents.com/es/materiales/ams/5665.md fr: https://steelequivalents.com/fr/matériaux/ams/5665.md hu: https://steelequivalents.com/hu/anyagok/ams/5665.md it: https://steelequivalents.com/it/materiali/ams/5665.md nl: https://steelequivalents.com/nl/materialen/ams/5665.md pl: https://steelequivalents.com/pl/materiały/ams/5665.md pt: https://steelequivalents.com/pt/materiais/ams/5665.md ru: https://steelequivalents.com/ru/материалы/ams/5665.md tr: https://steelequivalents.com/tr/malzemeler/ams/5665.md zh: https://steelequivalents.com/zh/材料/ams/5665.md ja: https://steelequivalents.com/ja/材料/ams/5665.md ar: https://steelequivalents.com/ar/المواد/ams/5665.md ko: https://steelequivalents.com/ko/재료/ams/5665.md pt-br: https://steelequivalents.com/pt-br/materiais/ams/5665.md hi: https://steelequivalents.com/hi/सामग्री/ams/5665.md content_hash: sha256:288cc01aeb9bc9f2522ffed88a5c7824bee798aeeb15c7b7de2ef13abc5751a9 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/5665 > Canonical URL: https://steelequivalents.com/materials/ams/5665 > 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 · 20 designations # 5665 5665 is a designation in SAE AMS for the material held under material number 2.4816, also listed as NiCr15Fe. It is a material in the category High-temperature steels. We list 20 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR and SAE AMS. - [*Material no.* **2.4816**](/materials/material-no/2.4816 "Material no.: 2.4816") - [*Category* **High-temperature steels · 40 grades**](/categories/high-temperature-steels "Category: High-temperature steels · 40 grades") - *Designations* **20** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=22bc511c-a14d-4705-bddf-c653d267dd38&designation=4cce19c4-c1d0-4aab-9739-cc0d4af90f51 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ams/5665.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN NiCr15Fe This grade’s own name](/materials/din-en/nicr15fe "DIN / EN NiCr15Fe") - [UNS N06040 This grade’s own name](/materials/uns/n06040 "UNS N06040") ## About High-temperature steels High-temperature steels are steels designed to retain useful strength and structural stability during exposure to elevated temperatures. Their alloying systems provide resistance to oxidation, creep and loss of mechanical properties during prolonged heating, making them suitable for furnace components, heat exchangers, boilers and other hot-service equipment. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 20 designations · 7 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 - [NiCr15Fe This grade’s own name](/materials/din-en/nicr15fe "DIN / EN NiCr15Fe") UNS United States · 3 - [N06040 This grade’s own name](/materials/uns/n06040 "UNS N06040") - [N06600 Indicative](/materials/uns/n06600 "UNS N06600") - [N06600; Alloy 600 Indicative](/materials/uns/n06600-alloy-600 "UNS N06600; Alloy 600") AISI / SAE United States · 1 - [5540 Indicative](/materials/aisi-sae/5540 "AISI / SAE 5540") ASTM United States · 11 - [B163 Indicative](/materials/astm/b163 "ASTM B163") - [B166 Indicative](/materials/astm/b166 "ASTM B166") - [B167 Indicative](/materials/astm/b167 "ASTM B167") - [B168 Indicative](/materials/astm/b168 "ASTM B168") - [B366 Indicative](/materials/astm/b366 "ASTM B366") - [B516 Indicative](/materials/astm/b516 "ASTM B516") - [B517 Indicative](/materials/astm/b517 "ASTM B517") - [B564 Indicative](/materials/astm/b564 "ASTM B564") - [B751 Indicative](/materials/astm/b751 "ASTM B751") - [B775 Indicative](/materials/astm/b775 "ASTM B775") - [B829 Indicative](/materials/astm/b829 "ASTM B829") BS United Kingdom · 1 - [3072-76 Indicative](/materials/bs/3072-76 "BS 3072-76") AFNOR France · 1 - [NC 15 Fe Indicative](/materials/afnor/nc-15-fe "AFNOR NC 15 Fe") SAE AMS United States / Aerospace · 2 - [5580 Indicative tubing](/materials/ams/5580 "SAE AMS 5580") - **5665 Indicative bar forging ring** Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 13 elements on file · weight % What this alloy is Fe Ni Cr Co Iron — the balance, never listed by a standard — 8.3 % Ni — 72 % Cr — 15.5 % Co — 1.5 % Traces & impurities · 2.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.05–0.1 | | Si | ≤ 0.5 | | Mn | ≤ 1 | | P | 0.02 | | S | 0.015 | | Cr | 14–17 | | Ni | ≥ 72 — Unusual | | Co | ≤ 1.5 | | Cu | ≤ 0.5 | | Al | ≤ 0.3 | | Ti | ≤ 0.3 | | B | ≤ 0.006 | | Fe | 6–10 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel Cobalt Copper Aluminium Titanium Boron 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 | |---|---|---|---|---| | B | ≤0,006 | — | 0.006 | Max | | C | 0,05-0,10 | 0.050 | 0.100 | Range | | Al | ≤0,30 | — | 0.300 | Max | | Si | ≤0,50 | — | 0.500 | Max | | P | 0,02 | 0.020 | 0.020 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Ti | ≤0,30 | — | 0.300 | Max | | Cr | 14,0-17,0 | 14.000 | 17.000 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Fe | 6,00-10,0 | 6.000 | 10.000 | Range | | Co | ≤1,50 | — | 1.500 | Max | | Ni | ≥72,0 | 72.000 | — | Min | | 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: Ni, Mo. ## Physical & mechanical properties Density 8,45 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. ## Properties by condition 1 conditions · 1 values By delivery state**Solution annealed** source `steelnumber` | Delivery state | HB | |---|---| | Solution annealed | 200 | Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 2.4, a shared category, and a published range for Ni / Cr 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. [NiCr15Fe7Ti2Al 2.4669 Ni ≥70,0(+Co) · Cr 14,0-17,0 - ΔNi 2.00 - ΔCr 0.00 - 23 designations](/materials/din-en/nicr15fe7ti2al "NiCr15Fe7Ti2Al") ## 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=22bc511c-a14d-4705-bddf-c653d267dd38&designation=4cce19c4-c1d0-4aab-9739-cc0d4af90f51 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ams/5665.pdf "Datasheet as PDF")