--- title: "HR402 — High-temperature steels / aviation variant" description: "HR402 in BS: material number 2.4632, also listed as NiCr20Co18Ti. It is a material in the category High-temperature steels / aviation variant." canonical: https://steelequivalents.com/materials/bs/hr402 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/bs/hr402.md cs: https://steelequivalents.com/cs/materiály/bs/hr402.md de: https://steelequivalents.com/de/werkstoffe/bs/hr402.md es: https://steelequivalents.com/es/materiales/bs/hr402.md fr: https://steelequivalents.com/fr/matériaux/bs/hr402.md hu: https://steelequivalents.com/hu/anyagok/bs/hr402.md it: https://steelequivalents.com/it/materiali/bs/hr402.md nl: https://steelequivalents.com/nl/materialen/bs/hr402.md pl: https://steelequivalents.com/pl/materiały/bs/hr402.md pt: https://steelequivalents.com/pt/materiais/bs/hr402.md ru: https://steelequivalents.com/ru/материалы/bs/hr402.md tr: https://steelequivalents.com/tr/malzemeler/bs/hr402.md zh: https://steelequivalents.com/zh/材料/bs/hr402.md ja: https://steelequivalents.com/ja/材料/bs/hr402.md ar: https://steelequivalents.com/ar/المواد/bs/hr402.md ko: https://steelequivalents.com/ko/재료/bs/hr402.md pt-br: https://steelequivalents.com/pt-br/materiais/bs/hr402.md hi: https://steelequivalents.com/hi/सामग्री/bs/hr402.md content_hash: sha256:d1b68f14f7e4b31bf3bc0d544f9fa997cfc622ca5725814dfb5b8df8a1b0cb9d 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/bs/hr402 > Canonical URL: https://steelequivalents.com/materials/bs/hr402 > 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. BS · United Kingdom · 14 designations # HR402 HR402 is a designation in BS for the material held under material number 2.4632, also listed as NiCr20Co18Ti. It is a material in the category High-temperature steels / aviation variant. We list 14 designations recorded for this grade, in the standards DIN / EN, UNS, BS, ISO, SAE AMS and GB. - [*Material no.* **2.4632**](/materials/material-no/2.4632 "Material no.: 2.4632") - [*Category* **High-temperature steels / aviation variant · 12 grades**](/categories/high-temperature-steels-aviation-variant "Category: High-temperature steels / aviation variant · 12 grades") - *Designations* **14** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=95615fa1-1b51-4f22-9550-09f05e1a4f0f&designation=c40a97e5-de78-4b8f-add8-fbf1e7dcc9ff "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/hr402.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN NiCr20Co18Ti This grade’s own name · 2 grades on that route](/materials/din-en/nicr20co18ti "DIN / EN NiCr20Co18Ti") - [UNS N07090 This grade’s own name · 2 grades on that route](/materials/uns/n07090 "UNS N07090") ## About High-temperature steels / aviation variant High-temperature aviation steels are heat-resistant materials designed to retain strength and structural stability during prolonged exposure to elevated temperatures. Their alloying provides resistance to creep, oxidation, and thermal degradation, making them suitable for aircraft engine and other hot-section components. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 14 designations · 6 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 - [NiCr20Co18Ti This grade’s own name](/materials/din-en/nicr20co18ti "DIN / EN NiCr20Co18Ti") UNS United States · 1 - [N07090 This grade’s own name](/materials/uns/n07090 "UNS N07090") BS United Kingdom · 7 - [HR2 Indicative](/materials/is/hr2 "BS HR2") - [HR202 Indicative](/materials/bs/hr202 "BS HR202") - **HR402 Indicative** - [HR501 Indicative](/materials/bs/hr501 "BS HR501") - [HR502 Indicative](/materials/bs/hr502 "BS HR502") - [HR503 Indicative](/materials/bs/hr503 "BS HR503") - [NA19 Indicative](/materials/bs/na19 "BS NA19") ISO International · 2 - [NiCr20Co18Ti3 Indicative](/materials/din-en/nicr20co18ti3 "ISO NiCr20Co18Ti3") - [NW7090 Indicative](/materials/iso/nw7090 "ISO NW7090") SAE AMS United States / Aerospace · 1 - [5829 Indicative](/materials/ams/5829 "SAE AMS 5829") GB China · 2 - [GH4090 Indicative](/materials/gb/gh4090 "GB GH4090") - [GH90 Indicative](/materials/gb/gh90 "GB GH90") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 14 elements on file · weight % What this alloy is Fe Cr Co Ti Iron — the balance, never listed by a standard — 56 % Cr — 19.5 % Co — 18 % Ti — 2.5 % Traces & impurities · 4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.13 | | Si | ≤ 1 | | Mn | ≤ 1 | | P | 0.02 | | S | 0.015 | | Cr | 18–21 | | Ni | Balance | | Co | 15–21 | | Cu | ≤ 0.2 | | Al | 1–2 | | Ti | 2–3 — Unusual | | B | ≤ 0.02 — Unusual | | Zr | ≤ 0.15 | | Fe | ≤ 1.5 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel Cobalt Copper Aluminium Titanium Boron Zirconium 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 | ≤0,020 | — | 0.020 | Max | | C | ≤0,13 | — | 0.130 | Max | | Al | 1,00-2,00 | 1.000 | 2.000 | Range | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,02 | 0.020 | 0.020 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Ti | 2,00-3,00 | 2.000 | 3.000 | Range | | Cr | 18,0-21,0 | 18.000 | 21.000 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Fe | ≤1,50 | — | 1.500 | Max | | Co | 15,0-21,0 | 15.000 | 21.000 | Range | | Ni | Rest/Bal. | 48.965 | 63.965 | Balance | | Cu | ≤0,20 | — | 0.200 | Max | | Zr | ≤0,15 | — | 0.150 | 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 8,18 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=95615fa1-1b51-4f22-9550-09f05e1a4f0f&designation=c40a97e5-de78-4b8f-add8-fbf1e7dcc9ff "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/hr402.pdf "Datasheet as PDF")