--- title: "HR201 — High-temperature steels / aviation variant" description: "HR201 in BS: material number 2.4631, also listed as NiCr20TiAl. It is a material in the category High-temperature steels / aviation variant." canonical: https://steelequivalents.com/materials/bs/hr201 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/bs/hr201.md cs: https://steelequivalents.com/cs/materiály/bs/hr201.md de: https://steelequivalents.com/de/werkstoffe/bs/hr201.md es: https://steelequivalents.com/es/materiales/bs/hr201.md fr: https://steelequivalents.com/fr/matériaux/bs/hr201.md hu: https://steelequivalents.com/hu/anyagok/bs/hr201.md it: https://steelequivalents.com/it/materiali/bs/hr201.md nl: https://steelequivalents.com/nl/materialen/bs/hr201.md pl: https://steelequivalents.com/pl/materiały/bs/hr201.md pt: https://steelequivalents.com/pt/materiais/bs/hr201.md ru: https://steelequivalents.com/ru/материалы/bs/hr201.md tr: https://steelequivalents.com/tr/malzemeler/bs/hr201.md zh: https://steelequivalents.com/zh/材料/bs/hr201.md ja: https://steelequivalents.com/ja/材料/bs/hr201.md ar: https://steelequivalents.com/ar/المواد/bs/hr201.md ko: https://steelequivalents.com/ko/재료/bs/hr201.md pt-br: https://steelequivalents.com/pt-br/materiais/bs/hr201.md hi: https://steelequivalents.com/hi/सामग्री/bs/hr201.md content_hash: sha256:2cd60ace90d8f189dc525128033740f4bcf3731cd3d8c5e3943fa2500a9231de 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/hr201 > Canonical URL: https://steelequivalents.com/materials/bs/hr201 > 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 · 11 designations # HR201 HR201 is a designation in BS for the material held under material number 2.4631, also listed as NiCr20TiAl. It is a material in the category High-temperature steels / aviation variant. We list 11 designations recorded for this grade, in the standards DIN / EN, UNS, ASTM, BS, AFNOR and SS. - [*Material no.* **2.4631**](/materials/material-no/2.4631 "Material no.: 2.4631") - [*Category* **High-temperature steels / aviation variant · 12 grades**](/categories/high-temperature-steels-aviation-variant "Category: High-temperature steels / aviation variant · 12 grades") - *Designations* **11** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=0fe787b0-ace1-47c0-93c3-36aa1400ffbb&designation=7b078a6d-502c-4d16-bd58-966885b4ec76 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/hr201.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN NiCr20TiAl This grade’s own name · 2 grades on that route](/materials/din-en/nicr20tial "DIN / EN NiCr20TiAl") - [UNS N07080 This grade’s own name · 2 grades on that route](/materials/uns/n07080 "UNS N07080") ## 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 11 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 - [NiCr20TiAl This grade’s own name](/materials/din-en/nicr20tial "DIN / EN NiCr20TiAl") UNS United States · 1 - [N07080 This grade’s own name](/materials/uns/n07080 "UNS N07080") ASTM United States · 1 - [B 637 Indicative](/materials/astm/b637 "ASTM B 637") BS United Kingdom · 6 - [736B Indicative](/materials/bs/736b "BS 736B") - [HR1 Indicative](/materials/is/hr1 "BS HR1") - **HR201 Indicative** - [HR401 Indicative](/materials/bs/hr401 "BS HR401") - [HR401HR601 Indicative](/materials/bs/hr401hr601 "BS HR401HR601") - [HR601 Indicative](/materials/bs/hr601 "BS HR601") AFNOR France · 1 - [NC 20 TA Indicative](/materials/afnor/nc20ta "AFNOR NC 20 TA") SS Sweden · 1 - [MH-07 Indicative](/materials/ss/mh-07 "SS MH-07") 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 Cr Ti Co Iron — the balance, never listed by a standard — 72.5 % Cr — 19.5 % Ti — 2.3 % Co — 2 % Traces & impurities · 3.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.04–0.1 | | Si | ≤ 1 | | Mn | ≤ 1 | | P | 0.03 | | S | 0.015 | | Cr | 18–21 | | Ni | Balance | | Co | ≤ 2 | | Cu | ≤ 0.2 | | Al | 1–1.8 | | Ti | 1.8–2.7 — Unusual | | B | ≤ 0.008 | | Fe | ≤ 1.5 | 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 | ≤0,008 | — | 0.008 | Max | | C | 0,04-0,10 | 0.040 | 0.100 | Range | | Al | 1,00-1,80 | 1.000 | 1.800 | Range | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Ti | 1,80-2,70 | 1.800 | 2.700 | Range | | Cr | 18,0-21,0 | 18.000 | 21.000 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Fe | ≤1,50 | — | 1.500 | Max | | Co | ≤2,00 | — | 2.000 | Max | | Ni | Rest/Bal. | 68.647 | 79.115 | Balance | | Cu | ≤0,20 | — | 0.200 | 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 8,2 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. ## Properties by condition 1 conditions · 1 values By delivery state**Solution annealed** source `steelnumber` | Delivery state | HRC | |---|---| | Solution annealed | 32 | 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. [NiCr20Ti 2.4630 Ni Rest/Bal. · Cr 18,0-21,0 - ΔNi 0.20 - ΔCr 0.00 - 10 designations](/materials/din-en/nicr20ti "NiCr20Ti") ## 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=0fe787b0-ace1-47c0-93c3-36aa1400ffbb&designation=7b078a6d-502c-4d16-bd58-966885b4ec76 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/hr201.pdf "Datasheet as PDF")