--- title: "5590 — High-temperature steels" description: "5590 in SAE AMS: material number 2.4668, also listed as NiCr19Fe19Nb5Mo3. It is a material in the category High-temperature steels." canonical: https://steelequivalents.com/materials/ams/5590 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/ams/5590.md cs: https://steelequivalents.com/cs/materiály/ams/5590.md de: https://steelequivalents.com/de/werkstoffe/ams/5590.md es: https://steelequivalents.com/es/materiales/ams/5590.md fr: https://steelequivalents.com/fr/matériaux/ams/5590.md hu: https://steelequivalents.com/hu/anyagok/ams/5590.md it: https://steelequivalents.com/it/materiali/ams/5590.md nl: https://steelequivalents.com/nl/materialen/ams/5590.md pl: https://steelequivalents.com/pl/materiały/ams/5590.md pt: https://steelequivalents.com/pt/materiais/ams/5590.md ru: https://steelequivalents.com/ru/материалы/ams/5590.md tr: https://steelequivalents.com/tr/malzemeler/ams/5590.md zh: https://steelequivalents.com/zh/材料/ams/5590.md ja: https://steelequivalents.com/ja/材料/ams/5590.md ar: https://steelequivalents.com/ar/المواد/ams/5590.md ko: https://steelequivalents.com/ko/재료/ams/5590.md pt-br: https://steelequivalents.com/pt-br/materiais/ams/5590.md hi: https://steelequivalents.com/hi/सामग्री/ams/5590.md content_hash: sha256:3de1d214409e52c3beb9d62e033f7ae3eda9e54a2c859443088c0e0d12a3d613 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/ams/5590 > Canonical URL: https://steelequivalents.com/materials/ams/5590 > 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 · 29 designations # 5590 5590 is a designation in SAE AMS for the material held under material number 2.4668, also listed as NiCr19Fe19Nb5Mo3. It is a material in the category High-temperature steels. We list 29 designations recorded for this grade, in the standards DIN / EN, UNS, ASTM, BS, AFNOR, ISO, SAE AMS, JIS, GOST, SS and KS. - [*Material no.* **2.4668**](/materials/material-no/2.4668 "Material no.: 2.4668") - [*Category* **High-temperature steels · 40 grades**](/categories/high-temperature-steels "Category: High-temperature steels · 40 grades") - *Designations* **29** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=9e2be1cc-22f5-4afb-86c2-c14383d68bd1&designation=2df5d68c-70ad-4f1e-ba3e-518037bd1812 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ams/5590.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN NiCr19Fe19Nb5Mo3 This grade’s own name · 2 grades on that route](/materials/din-en/nicr19fe19nb5mo3 "DIN / EN NiCr19Fe19Nb5Mo3") - [UNS N07718 This grade’s own name · 3 grades on that route](/materials/uns/n07718 "UNS N07718") ## 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 29 designations · 11 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 - [NiCr19Fe19Nb5Mo3 This grade’s own name](/materials/din-en/nicr19fe19nb5mo3 "DIN / EN NiCr19Fe19Nb5Mo3") - [NiCr19NbMo This grade’s own name Withdrawn](/materials/din-en/nicr19nbmo "DIN / EN NiCr19NbMo") UNS United States · 1 - [N07718 This grade’s own name](/materials/uns/n07718 "UNS N07718") ASTM United States · 5 - [B637 Indicative](/materials/astm/b637 "ASTM B637") - [B670 Indicative](/materials/astm/b670 "ASTM B670") - [F3055 Indicative](/materials/astm/f3055 "ASTM F3055") - [Inconel 718 wg AMS Indicative](/materials/astm/inconel-718-wg-ams "ASTM Inconel 718 wg AMS") - [N07718 Indicative](/materials/uns/n07718 "ASTM N07718") BS United Kingdom · 2 - [BS2901 grade NA51 Indicative](/materials/bs/bs2901-grade-na51 "BS BS2901 grade NA51") - [HR8 Indicative](/materials/bs/hr8 "BS HR8") AFNOR France · 1 - [NC 19FeNb Indicative](/materials/afnor/nc-19fenb "AFNOR NC 19FeNb") ISO International · 2 - [NiCr19Fe19Nb5Mo3 Indicative](/materials/din-en/nicr19fe19nb5mo3 "ISO NiCr19Fe19Nb5Mo3") - [NW7718 Indicative](/materials/iso/nw7718 "ISO NW7718") SAE AMS United States / Aerospace · 9 - [5589 Indicative tube](/materials/ams/5589 "SAE AMS 5589") - **5590 Indicative tube** - [5596 Indicative plate sheet strip](/materials/ams/5596 "SAE AMS 5596") - [5597 Indicative plate sheet strip](/materials/ams/5597 "SAE AMS 5597") - [5662 Indicative bar forging ring](/materials/ams/5662 "SAE AMS 5662") - [5663 Indicative bar forging ring](/materials/ams/5663 "SAE AMS 5663") - [5664 Indicative bar forging ring](/materials/ams/5664 "SAE AMS 5664") - [5832 Indicative wire](/materials/ams/5832 "SAE AMS 5832") - [5962 Indicative bar](/materials/ams/5962 "SAE AMS 5962") JIS Japan · 1 - [NCF718 Indicative](/materials/jis/ncf718 "JIS NCF718") GOST Russia / CIS · 4 - [ChN55MBJu Indicative](/materials/gost/chn55mbju "GOST ChN55MBJu") - [ChN55MTJuB Indicative](/materials/gost/chn55mtjub "GOST ChN55MTJuB") - [ХН55МБЮ Indicative](/materials/gost/khn55mbyu "GOST ХН55МБЮ") - [ХН55МТЮВ Indicative](/materials/gost/khn55mtyuv "GOST ХН55МТЮВ") SS Sweden · 1 - [MH-06 Indicative](/materials/ss/mh-06 "SS MH-06") KS South Korea · 1 - [NCF718 Indicative](/materials/jis/ncf718 "KS NCF718") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 15 elements on file · weight % What this alloy is Fe Ni Cr Nb Iron — the balance, never listed by a standard — 16.9 % Ni — 52.5 % Cr — 19 % Nb — 5.1 % Traces & impurities · 6.5 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.02–0.08 | | Si | ≤ 0.35 | | Mn | ≤ 0.35 | | P | 0.015 | | S | 0.015 | | Cr | 17–21 | | Mo | 2.8–3.3 | | Ni | 50–55 | | Co | ≤ 1 | | Cu | ≤ 0.3 | | Al | 0.3–0.7 | | Ti | 0.6–1.2 | | Nb | 4.7–5.5 — Unusual | | B | 0.002–0.006 | | Fe | Balance | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Cobalt Copper Aluminium Titanium Niobium 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 | 0,002-0,006 | 0.002 | 0.006 | Range | | C | 0,02-0,08 | 0.020 | 0.080 | Range | | Al | 0,30-0,70 | 0.300 | 0.700 | Range | | Si | ≤0,35 | — | 0.350 | Max | | P | 0,015 | 0.015 | 0.015 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Ti | 0,60-1,20 | 0.600 | 1.200 | Range | | Cr | 17,0-21,0 | 17.000 | 21.000 | Range | | Mn | ≤0,35 | — | 0.350 | Max | | Fe | Rest/Bal. | 11.184 | 24.548 | Balance | | Co | ≤1,00 | — | 1.000 | Max | | Ni | 50,0-55,0 | 50.000 | 55.000 | Range | | Cu | ≤0,30 | — | 0.300 | Max | | Nb | 4,70-5,50 | 4.700 | 5.500 | Range | | Mo | 2,80-3,30 | 2.800 | 3.300 | 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 This grade's composition falls outside the published model's validated range (a low-alloy composition window), so no transformation temperature is predicted here. ## 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. [NiCr20CoMo 2.4982 Ni Rest/Bal. · Cr 18,0-21,0 - ΔNi 1.88 - ΔCr 0.50 - 1 designations](/materials/din-en/nicr20como "NiCr20CoMo")[NiCr18Co 2.4983 Ni Rest/Bal. · Cr 17,0-20,0 - ΔNi 2.05 - ΔCr 0.50 - 4 designations](/materials/din-en/nicr18co "NiCr18Co")[NiCr22Fe18Mo 2.4665 Ni Rest/Bal. · Cr 20,5-23,0 - ΔNi 5.49 - ΔCr 2.75 - 26 designations](/materials/din-en/nicr22fe18mo "NiCr22Fe18Mo") ## 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=9e2be1cc-22f5-4afb-86c2-c14383d68bd1&designation=2df5d68c-70ad-4f1e-ba3e-518037bd1812 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ams/5590.pdf "Datasheet as PDF")