--- title: "5671 — High-temperature steels" description: "5671 in SAE AMS: material number 2.4669, also listed as NiCr15Fe7Ti2Al. Category: High-temperature steels. Designations recorded for this grade: 23." canonical: https://steelequivalents.com/materials/ams/5671 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/ams/5671.md cs: https://steelequivalents.com/cs/materiály/ams/5671.md de: https://steelequivalents.com/de/werkstoffe/ams/5671.md es: https://steelequivalents.com/es/materiales/ams/5671.md fr: https://steelequivalents.com/fr/matériaux/ams/5671.md hu: https://steelequivalents.com/hu/anyagok/ams/5671.md it: https://steelequivalents.com/it/materiali/ams/5671.md nl: https://steelequivalents.com/nl/materialen/ams/5671.md pl: https://steelequivalents.com/pl/materiały/ams/5671.md pt: https://steelequivalents.com/pt/materiais/ams/5671.md ru: https://steelequivalents.com/ru/материалы/ams/5671.md tr: https://steelequivalents.com/tr/malzemeler/ams/5671.md zh: https://steelequivalents.com/zh/材料/ams/5671.md ja: https://steelequivalents.com/ja/材料/ams/5671.md ar: https://steelequivalents.com/ar/المواد/ams/5671.md ko: https://steelequivalents.com/ko/재료/ams/5671.md pt-br: https://steelequivalents.com/pt-br/materiais/ams/5671.md hi: https://steelequivalents.com/hi/सामग्री/ams/5671.md content_hash: sha256:9630ca65a94ca366558d72485814f4bfe346f43b13a5bf360954b0ca1575a512 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/5671 > Canonical URL: https://steelequivalents.com/materials/ams/5671 > 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 · 23 designations # 5671 5671 is a designation in SAE AMS for the material held under material number 2.4669, also listed as NiCr15Fe7Ti2Al. It is a material in the category High-temperature steels. We list 23 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, ISO, SAE AMS and JIS. - [*Material no.* **2.4669**](/materials/material-no/2.4669 "Material no.: 2.4669") - [*Category* **High-temperature steels · 40 grades**](/categories/high-temperature-steels "Category: High-temperature steels · 40 grades") - *Designations* **23** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=d8480a2c-1007-4fe1-af75-1dc428ce8f24&designation=865866d3-fb7a-4da4-92b7-b492d80c4303 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ams/5671.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN NiCr15Fe7Ti2Al This grade’s own name](/materials/din-en/nicr15fe7ti2al "DIN / EN NiCr15Fe7Ti2Al") - [UNS N07750 This grade’s own name](/materials/uns/n07750 "UNS N07750") - [AISI / SAE 688 This grade’s own name](/materials/aisi-sae/688 "AISI / SAE 688") ## 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 23 designations · 9 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 · 2 - [NiCr15Fe7Ti2Al This grade’s own name](/materials/din-en/nicr15fe7ti2al "DIN / EN NiCr15Fe7Ti2Al") - [NiCr15Fe7TiAl This grade’s own name](/materials/din-en/nicr15fe7tial "DIN / EN NiCr15Fe7TiAl") UNS United States · 2 - [N07750 This grade’s own name](/materials/uns/n07750 "UNS N07750") - [N07752 Indicative](/materials/uns/n07752 "UNS N07752") AISI / SAE United States · 2 - [5542G Indicative](/materials/aisi-sae/5542g "AISI / SAE 5542G") - [688 This grade’s own name](/materials/aisi-sae/688 "AISI / SAE 688") ASTM United States · 3 - [B 637 Indicative](/materials/astm/b637 "ASTM B 637") - [Inconel® X-750 Indicative](/materials/ks/inconelx750 "ASTM Inconel® X-750") - [N07750 Indicative](/materials/uns/n07750 "ASTM N07750") BS United Kingdom · 1 - [HR505 Indicative](/materials/bs/hr505 "BS HR505") AFNOR France · 1 - [NC 15 Fe TNb Indicative](/materials/afnor/nc-15-fe-tnb "AFNOR NC 15 Fe TNb") ISO International · 1 - [NW7750 Indicative](/materials/iso/nw7750 "ISO NW7750") SAE AMS United States / Aerospace · 10 - [5542 Indicative plate sheet strip](/materials/ams/5542 "SAE AMS 5542") - [5598 Indicative plate sheet strip](/materials/ams/5598 "SAE AMS 5598") - [5667 Indicative bar forging rod](/materials/ams/5667 "SAE AMS 5667") - [5668 Indicative bar forging rod](/materials/ams/5668 "SAE AMS 5668") - [5669 Indicative bar forging rod](/materials/ams/5669 "SAE AMS 5669") - [5670 Indicative bar forging rod](/materials/ams/5670 "SAE AMS 5670") - **5671 Indicative bar forging rod** - [5698 Indicative wire](/materials/ams/5698 "SAE AMS 5698") - [5699 Indicative wire](/materials/ams/5699 "SAE AMS 5699") - [5747 Indicative bar forging rod](/materials/ams/5747 "SAE AMS 5747") JIS Japan · 1 - [NCF750 Indicative](/materials/jis/ncf750 "JIS NCF750") 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 Ti Iron — the balance, never listed by a standard — 7.2 % Ni — 70 % Cr — 15.5 % Ti — 2.5 % Traces & impurities · 4.8 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.08 | | Si | ≤ 0.5 | | Mn | ≤ 1 | | P | 0.02 | | S | 0.015 | | Cr | 14–17 | | Ni | ≥ 70 | | Co | ≤ 1 | | Cu | ≤ 0.5 | | Al | 0.4–1 | | Ti | 2.25–2.75 — Unusual | | Nb | 0.7–1.2 | | Fe | 5–9 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel Cobalt Copper Aluminium Titanium Niobium 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 | ≤0,08 | — | 0.080 | Max | | Al | 0,40-1,00 | 0.400 | 1.000 | Range | | Si | ≤0,50 | — | 0.500 | Max | | P | 0,02 | 0.020 | 0.020 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Ti | 2,25-2,75 | 2.250 | 2.750 | Range | | Cr | 14,0-17,0 | 14.000 | 17.000 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Fe | 5,00-9,00 | 5.000 | 9.000 | Range | | Co | ≤1,00 | — | 1.000 | Max | | Ni | ≥70,0(+Co) | 70.000 | — | Min | | Cu | ≤0,50 | — | 0.500 | Max | | Nb | 0,70-1,20 | 0.700 | 1.200 | 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: Ni, 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. ## 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. [NiCr15Fe 2.4816 Ni ≥72,0 · Cr 14,0-17,0 - ΔNi 2.00 - ΔCr 0.00 - 20 designations](/materials/din-en/nicr15fe "NiCr15Fe") ## 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=d8480a2c-1007-4fe1-af75-1dc428ce8f24&designation=865866d3-fb7a-4da4-92b7-b492d80c4303 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ams/5671.pdf "Datasheet as PDF")