--- title: "40NCD2 — Quenched and tempered steels" description: "40NCD2 in AFNOR: material number 1.6546, also listed as 40NiCrMo2-2. It is a material in the category Quenched and tempered steels." canonical: https://steelequivalents.com/materials/afnor/40ncd2 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/afnor/40ncd2.md cs: https://steelequivalents.com/cs/materiály/afnor/40ncd2.md de: https://steelequivalents.com/de/werkstoffe/afnor/40ncd2.md es: https://steelequivalents.com/es/materiales/afnor/40ncd2.md fr: https://steelequivalents.com/fr/matériaux/afnor/40ncd2.md hu: https://steelequivalents.com/hu/anyagok/afnor/40ncd2.md it: https://steelequivalents.com/it/materiali/afnor/40ncd2.md nl: https://steelequivalents.com/nl/materialen/afnor/40ncd2.md pl: https://steelequivalents.com/pl/materiały/afnor/40ncd2.md pt: https://steelequivalents.com/pt/materiais/afnor/40ncd2.md ru: https://steelequivalents.com/ru/материалы/afnor/40ncd2.md tr: https://steelequivalents.com/tr/malzemeler/afnor/40ncd2.md zh: https://steelequivalents.com/zh/材料/afnor/40ncd2.md ja: https://steelequivalents.com/ja/材料/afnor/40ncd2.md ar: https://steelequivalents.com/ar/المواد/afnor/40ncd2.md ko: https://steelequivalents.com/ko/재료/afnor/40ncd2.md pt-br: https://steelequivalents.com/pt-br/materiais/afnor/40ncd2.md hi: https://steelequivalents.com/hi/सामग्री/afnor/40ncd2.md content_hash: sha256:8312e45fa044683f488ca7de1489dd011b7db7ae36065e0fc79d8f32555f8e83 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/afnor/40ncd2 > Canonical URL: https://steelequivalents.com/materials/afnor/40ncd2 > 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. AFNOR · France · 43 designations # 40NCD2 40NCD2 is a designation in AFNOR for the material held under material number 1.6546, also listed as 40NiCrMo2-2. It is a material in the category Quenched and tempered steels. We list 43 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, SAE AMS, JIS, GB, GOST, UNI, PN, COPANT and NBN. - [*Material no.* **1.6546**](/materials/material-no/1.6546 "Material no.: 1.6546") - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **43** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=a21a66ef-67f7-452e-93c4-c17fe527a6a4&designation=231adb08-3468-4842-be99-94e06b9d3745 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/afnor/40ncd2.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 40NiCrMo2-2 This grade’s own name](/materials/din-en/40nicrmo2-2 "DIN / EN 40NiCrMo2-2") - [UNS G86400 This grade’s own name](/materials/uns/g86400 "UNS G86400") - [AISI / SAE 8640 This grade’s own name](/materials/aisi-sae/8640 "AISI / SAE 8640") ## About Quenched and tempered steels Quenched and tempered steels are heat-treated steels designed to combine high strength with useful toughness and ductility. They are used for heavily loaded components such as shafts, gears, fasteners and structural machine parts where resistance to mechanical stress is required. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 43 designations · 15 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 - [1.6546 Indicative](/materials/material-no/1.6546 "DIN / EN 1.6546") - [40NiCrMo2-2 This grade’s own name](/materials/din-en/40nicrmo2-2 "DIN / EN 40NiCrMo2-2") UNS United States · 7 - [G86400 This grade’s own name](/materials/uns/g86400 "UNS G86400") - [G87400 This grade’s own name](/materials/uns/g87400 "UNS G87400") - [G87420 This grade’s own name](/materials/uns/g87420 "UNS G87420") - [H86400 This grade’s own name](/materials/uns/h86400 "UNS H86400") - [H87400 This grade’s own name](/materials/uns/h87400 "UNS H87400") - [K11640 Indicative](/materials/uns/k11640 "UNS K11640") - [K13049 This grade’s own name](/materials/uns/k13049 "UNS K13049") AISI / SAE United States · 8 - [8640 This grade’s own name](/materials/aisi-sae/8640 "AISI / SAE 8640") - [8640H This grade’s own name](/materials/aisi-sae/8640h "AISI / SAE 8640H") - [8740 This grade’s own name](/materials/aisi-sae/8740 "AISI / SAE 8740") - [8740H This grade’s own name](/materials/aisi-sae/8740h "AISI / SAE 8740H") - [8742 This grade’s own name](/materials/aisi-sae/8742 "AISI / SAE 8742") - [9840 Indicative](/materials/aisi-sae/9840 "AISI / SAE 9840") - [G86400 Indicative](/materials/uns/g86400 "AISI / SAE G86400") - [G98400 Indicative](/materials/uns/g98400 "AISI / SAE G98400") ASTM United States · 2 - [4340 Indicative](/materials/aisi-sae/4340 "ASTM 4340") - [A331 Indicative](/materials/astm/a331 "ASTM A331") BS United Kingdom · 3 - [311-Type 7 Indicative](/materials/bs/311-type-7 "BS 311-Type 7") - [3111-Type7 Indicative](/materials/bs/3111-type7 "BS 3111-Type7") - [871M40 Indicative](/materials/bs/871m40 "BS 871M40") AFNOR France · 1 - **40NCD2 Indicative** UNE Spain · 5 - [40NiCrMo2 Indicative](/materials/une/40nicrmo2 "UNE 40NiCrMo2") - [40NiCrMo2DF Indicative](/materials/une/40nicrmo2df "UNE 40NiCrMo2DF") - [F.1204 Indicative](/materials/une/f-1204 "UNE F.1204") - [F.1204-40NiCrMo2 Indicative](/materials/une/f-1204-40nicrmo2 "UNE F.1204-40NiCrMo2") - [F.1205 Indicative](/materials/une/f-1205 "UNE F.1205") SAE AMS United States / Aerospace · 1 - [6322 Indicative](/materials/ams/6322 "SAE AMS 6322") JIS Japan · 2 - [SNCM240 Indicative](/materials/jis/sncm240 "JIS SNCM240") - [SNCM439 Indicative](/materials/ks/sncm439 "JIS SNCM439") GB China · 1 - [40CrNiMoA Indicative](/materials/gb/40crnimoa "GB 40CrNiMoA") GOST Russia / CIS · 5 - [38KHGNM Indicative](/materials/gost/38khgnm "GOST 38KHGNM") - [38ХГНМ Indicative](/materials/gost/38khgnm "GOST 38ХГНМ") - [40KHGNM Indicative](/materials/gost/40khgnm "GOST 40KHGNM") - [40XHMA Indicative](/materials/gost/40xhma "GOST 40XHMA") - [40ХГНМ Indicative](/materials/gost/40khgnm "GOST 40ХГНМ") UNI Italy · 3 - [40NiCrMo2 Indicative](/materials/une/40nicrmo2 "UNI 40NiCrMo2") - [40NiCrMo2(KB) Indicative](/materials/uni/40nicrmo2-kb "UNI 40NiCrMo2(KB)") - [KB Indicative](/materials/uni/kb "UNI KB") PN Poland · 1 - [37HGNM Indicative](/materials/pn/37hgnm "PN 37HGNM") COPANT Latin America · 1 - [8640 Indicative](/materials/aisi-sae/8640 "COPANT 8640") NBN Belgium · 1 - [40NiCrMo2 Indicative](/materials/une/40nicrmo2 "NBN 40NiCrMo2") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 8 elements on file · weight % What this alloy is Fe Mn Ni Cr Iron — the balance, never listed by a standard — 97.1 % Mn — 0.9 % Ni — 0.6 % Cr — 0.5 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.37–0.44 | | Si | 0.15–0.4 | | Mn | 0.7–1 | | P | 0.035 | | S | 0.035 | | Cr | 0.4–0.6 | | Mo | 0.15–0.3 | | Ni | 0.4–0.7 | Carbon Silicon Manganese Phosphorus Sulfur Chromium 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 | 0,37-0,44 | 0.370 | 0.440 | Range | | Si | 0,15-0,40 | 0.150 | 0.400 | Range | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,40-0,60 | 0.400 | 0.600 | Range | | Mn | 0,70-1,00 | 0.700 | 1.000 | Range | | Ni | 0,40-0,70 | 0.400 | 0.700 | Range | | Mo | 0,15-0,30 | 0.150 | 0.300 | 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 computed from composition · °C Predicted Ae3 766 °C Predicted Ae1 722 °C Predicted Acm 613 °C Predicted Bs 533 °C These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either. ## 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. ## Properties by condition 1 conditions · 4 values By dimension**Quenching 840°C, oil, Drawing 560 - 620°C, air** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | KCU kJ/m² | |---|---|---|---|---| | Ø 25 | 980 | 835 | 12 | 880 | 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 1.6, 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. [21CrMoNiV4-7 1.6981 Mn 0,35-0,85 · Ni 0,20-0,80 - ΔMn 0.25 - ΔNi 0.05 - 1 designations](/materials/din-en/21crmoniv4-7 "21CrMoNiV4-7")[22NiMoCr3-7 1.6751 Mn 0,50-1,00 · Ni 0,60-1,20 - ΔMn 0.10 - ΔNi 0.35 - 3 designations](/materials/din-en/22nimocr3-7 "22NiMoCr3-7")[22NiMoCr4-7 1.6755 Mn 0,50-1,00 · Ni 0,60-1,20 - ΔMn 0.10 - ΔNi 0.35 - 7 designations](/materials/din-en/22nimocr4-7 "22NiMoCr4-7") ## 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=a21a66ef-67f7-452e-93c4-c17fe527a6a4&designation=231adb08-3468-4842-be99-94e06b9d3745 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/afnor/40ncd2.pdf "Datasheet as PDF")