--- title: "CFS9 — Heat-resistant structural steels" description: "CFS9 in BS: material number 1.5417, also listed as 26Mo2. Category: Heat-resistant structural steels. 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Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. BS · United Kingdom · 2 designations # CFS9 CFS9 is a designation in BS for the material held under material number 1.5417, also listed as 26Mo2. It is a material in the category Heat-resistant structural steels. We list 2 designations recorded for this grade, in the standards DIN / EN and BS. - [*Material no.* **1.5417**](/materials/material-no/1.5417 "Material no.: 1.5417") - [*Category* **Heat-resistant structural steels · 62 grades**](/categories/heat-resistant-structural-steels "Category: Heat-resistant structural steels · 62 grades") - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=7ed63ec1-a610-4b6b-985a-14bf4e92d0be&designation=9b420ebe-3680-4c36-953d-40a0d21e02c0 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/cfs9.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 26Mo2 This grade’s own name](/materials/din-en/26mo2 "DIN / EN 26Mo2") ## About Heat-resistant structural steels Heat-resistant structural steels are structural steels designed to retain useful strength and dimensional stability at elevated temperatures. They are used for load-bearing components in hot-service equipment where mechanical performance must be maintained during heating. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 2 designations · 2 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 Withdrawn designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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 - [26Mo2 This grade’s own name](/materials/din-en/26mo2 "DIN / EN 26Mo2") BS United Kingdom · 1 - **CFS9 Indicative** Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 7 elements on file · weight % What this alloy is Fe Mn Si Ni Iron — the balance, never listed by a standard — 97.2 % Mn — 1.5 % Si — 0.4 % Ni — 0.4 % Traces & impurities · 0.5 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.22–0.29 | | Si | ≤ 0.4 | | Mn | ≤ 1.5 | | P | 0.035 | | S | 0.03 | | Mo | 0.15–0.25 | | Ni | 0.4 | Carbon Silicon Manganese Phosphorus Sulfur Molybdenum Nickel 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 | 0,22-0,29 | 0.220 | 0.290 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Mn | ≤1,50 | — | 1.500 | Max | | Ni | 0,4 | 0.400 | 0.400 | Exact | | Mo | 0,15-0,25 | 0.150 | 0.250 | 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: Cr. ## Physical & mechanical properties Density 7,85 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 1.5, a shared category, and a published range for Mn / Ni 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. [G20Mo5 1.5419 Mn 0,50-1,00 · Ni 0,4 - ΔMn 0.00 - ΔNi 0.00 - 6 designations](/materials/din-en/g20mo5 "G20Mo5")[G18Mo5 1.5422 Mn 0,80-1,20 · Ni 0,4 - ΔMn 0.25 - ΔNi 0.00 - 1 designations](/materials/din-en/g18mo5 "G18Mo5")[26MnMoB6-4 1.5465 Mn 1,25-1,50 · Ni 0,25-0,50 - ΔMn 0.63 - ΔNi 0.03 - 1 designations](/materials/din-en/26mnmob6-4 "26MnMoB6-4")[G10MnMoV6-3 1.5410 Mn 1,20-1,80 · Ni 0,4 - ΔMn 0.75 - ΔNi 0.00 - 1 designations](/materials/din-en/g10mnmov6-3 "G10MnMoV6-3") ## 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=7ed63ec1-a610-4b6b-985a-14bf4e92d0be&designation=9b420ebe-3680-4c36-953d-40a0d21e02c0 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/cfs9.pdf "Datasheet as PDF")