--- title: "1.6565 — Quenched and tempered steels" description: "1.6565 is the material number of the grade also listed as 40NiCrMo6. Category: Quenched and tempered steels. Designations recorded for this grade: 56." canonical: https://steelequivalents.com/materials/material-no/1.6565 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.6565.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.6565.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.6565.md es: https://steelequivalents.com/es/materiales/número-de-material/1.6565.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.6565.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.6565.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.6565.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.6565.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.6565.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.6565.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.6565.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.6565.md zh: https://steelequivalents.com/zh/材料/材料编号/1.6565.md ja: https://steelequivalents.com/ja/材料/材料番号/1.6565.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.6565.md ko: https://steelequivalents.com/ko/재료/재료번호/1.6565.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.6565.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.6565.md content_hash: sha256:8e8d7f0cba6eb7ee53935b8d4d5adba8b1366f67efea8af523aa5ee54062f6bb 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/material-no/1.6565 > Canonical URL: https://steelequivalents.com/materials/material-no/1.6565 > 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. Material number · Europe · 56 designations # 1.6565 1.6565 is the material number of the grade also listed as 40NiCrMo6. It is a material in the category Quenched and tempered steels. We list 56 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, AS / NZS and KS. - ***Material no.* **1.6565**** - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **56** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=95f2674c-e0c3-404c-b3b2-0a38a7dfd884 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.6565.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 40NiCrMo6 This grade’s own name](/materials/din-en/40nicrmo6 "DIN / EN 40NiCrMo6") - [UNS G98500 This grade’s own name](/materials/uns/g98500 "UNS G98500") - [AISI / SAE 4340H This grade’s own name](/materials/aisi-sae/4340h "AISI / SAE 4340H") ## 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 56 designations · 16 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 - [40NiCrMo6 This grade’s own name](/materials/din-en/40nicrmo6 "DIN / EN 40NiCrMo6") UNS United States · 5 - [G43400 Indicative](/materials/uns/g43400 "UNS G43400") - [G98500 This grade’s own name](/materials/uns/g98500 "UNS G98500") - [H43400 This grade’s own name](/materials/uns/h43400 "UNS H43400") - [H43406 This grade’s own name](/materials/uns/h43406 "UNS H43406") - [K23028 This grade’s own name](/materials/uns/k23028 "UNS K23028") AISI / SAE United States · 7 - [4340 Indicative](/materials/aisi-sae/4340 "AISI / SAE 4340") - [4340H This grade’s own name](/materials/aisi-sae/4340h "AISI / SAE 4340H") - [9850 This grade’s own name](/materials/aisi-sae/9850 "AISI / SAE 9850") - [E4340H This grade’s own name](/materials/aisi-sae/e4340h "AISI / SAE E4340H") - [G43400 Indicative](/materials/uns/g43400 "AISI / SAE G43400") - [G98500 Indicative](/materials/uns/g98500 "AISI / SAE G98500") - [H43400 Indicative](/materials/uns/h43400 "AISI / SAE H43400") ASTM United States · 2 - [4340 SA-29 Grade 4340 Indicative](/materials/astm/4340-sa-29-grade-4340 "ASTM 4340 SA-29 Grade 4340") - [A829 Indicative](/materials/astm/a829 "ASTM A829") BS United Kingdom · 2 - [817A37 Indicative](/materials/bs/817a37 "BS 817A37") - [818 M 40 Indicative](/materials/bs/818m40 "BS 818 M 40") AFNOR France · 1 - [40 NCD 7 Indicative](/materials/afnor/40-ncd-7 "AFNOR 40 NCD 7") UNE Spain · 2 - [40NiCrMo7 Indicative](/materials/uni/40nicrmo7 "UNE 40NiCrMo7") - [F.1272 Indicative](/materials/une/f-1272 "UNE F.1272") SAE AMS United States / Aerospace · 5 - [6359 Indicative](/materials/ams/6359 "SAE AMS 6359") - [6409 Indicative](/materials/ams/6409 "SAE AMS 6409") - [6414 Indicative](/materials/ams/6414 "SAE AMS 6414") - [6415 Indicative](/materials/ams/6415 "SAE AMS 6415") - [6454 Indicative](/materials/ams/6454 "SAE AMS 6454") JIS Japan · 5 - [SNB24-1-5 Indicative](/materials/jis/snb24-1-5 "JIS SNB24-1-5") - [SNCM 439 STPT 38 Indicative](/materials/jis/sncm-439-stpt-38 "JIS SNCM 439 STPT 38") - [SNCM 8 Indicative](/materials/jis/sncm-8 "JIS SNCM 8") - [SNCM439 Indicative](/materials/ks/sncm439 "JIS SNCM439") - [STPT38 Indicative](/materials/jis/stpt38 "JIS STPT38") GB China · 2 - [40CrNiMoA Indicative](/materials/gb/40crnimoa "GB 40CrNiMoA") - [ML40CrNiMoA Indicative](/materials/gb/ml40crnimoa "GB ML40CrNiMoA") GOST Russia / CIS · 17 - [40ChN2MA Indicative](/materials/bds/40chn2ma "GOST 40ChN2MA") - [40Kh2G2M Indicative](/materials/gost/40kh2g2m "GOST 40Kh2G2M") - [40KH2N2MА Indicative](/materials/gost/40kh2n2ma "GOST 40KH2N2MА") - [40Kh2N2VA Indicative](/materials/gost/40kh2n2va "GOST 40Kh2N2VA") - [40KhN2MA Indicative](/materials/gost/40khn2ma "GOST 40KhN2MA") - [40Г1 Indicative](/materials/gost/40g1 "GOST 40Г1") - [40Х1НВА Indicative](/materials/gost/40kh1nva "GOST 40Х1НВА") - [40Х2Н2МА Indicative](/materials/gost/40kh2n2ma "GOST 40Х2Н2МА") - [5ФЛ Indicative](/materials/gost/5fl "GOST 5ФЛ") - [PK40N2D2 Indicative](/materials/gost/pk40n2d2 "GOST PK40N2D2") - [PK40N2D2M Indicative](/materials/gost/pk40n2d2m "GOST PK40N2D2M") - [ПК40Н2Д2-6.4 Indicative](/materials/gost/pk40n2d2-6-4 "GOST ПК40Н2Д2-6.4") - [ПК40Н2Д2-6.8 Indicative](/materials/gost/pk40n2d2-6-8 "GOST ПК40Н2Д2-6.8") - [ПК40Н2Д2-7.4 Indicative](/materials/gost/pk40n2d2-7-4 "GOST ПК40Н2Д2-7.4") - [ПК40Н2Д2М-6.8 Indicative](/materials/gost/pk40n2d2m-6-8 "GOST ПК40Н2Д2М-6.8") - [ПК40Н2Д2М-7.4 Indicative](/materials/gost/pk40n2d2m-7-4 "GOST ПК40Н2Д2М-7.4") - [ст.40Х2Н2МА Indicative](/materials/gost/st-40kh2n2ma "GOST ст.40Х2Н2МА") UNI Italy · 2 - [40 NiCrMo 7 Indicative](/materials/uni/40nicrmo7 "UNI 40 NiCrMo 7") - [NCM 4 Indicative](/materials/uni/ncm-4 "UNI NCM 4") PN Poland · 1 - [40HNMA Indicative](/materials/pn/40hnma "PN 40HNMA") COPANT Latin America · 1 - [4340 Indicative](/materials/aisi-sae/4340 "COPANT 4340") AS / NZS Australia / New Zealand · 2 - [4340 Indicative](/materials/aisi-sae/4340 "AS / NZS 4340") - [4340H Indicative](/materials/aisi-sae/4340h "AS / NZS 4340H") KS South Korea · 1 - [SNCM439 Indicative](/materials/ks/sncm439 "KS SNCM439") 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 Ni Cr Mn Iron — the balance, never listed by a standard — 95.7 % Ni — 1.5 % Cr — 1.2 % Mn — 0.6 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.35–0.45 | | Si | 0.15–0.35 | | Mn | 0.5–0.7 | | P | 0.035 | | S | 0.035 | | Cr | 0.9–1.4 | | Mo | 0.2–0.3 | | Ni | 1.4–1.7 | 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 | 0,35-0,45 | 0.350 | 0.450 | Range | | Si | 0,15-0,35 | 0.150 | 0.350 | Range | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,90-1,40 | 0.900 | 1.400 | Range | | Mn | 0,50-0,70 | 0.500 | 0.700 | Range | | Ni | 1,40-1,70 | 1.400 | 1.700 | Range | | Mo | 0,20-0,30 | 0.200 | 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 747 °C Predicted Ae1 729 °C Predicted Acm 640 °C Predicted Bs 501 °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 Transformation point Ac1 740 °C Exact Transformation point Ac3 805 °C Exact · Ac3(Acm) Weldability difficult to weld As published: hard weldability. Flake sensitivity susceptible As published: predisposed Temper brittleness not susceptible As published: not predisposed 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 2 conditions · 6 values By dimension**Quenching and drawing** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Ø 25 | 1080 | 930 | 10 | 45 | 780 | By delivery state**no delivery state stated** source `splav` | Delivery state | HB | |---|---| | 40KH2N2MА ( 40Х2Н2МА ) (annealing) , GOST 4543-71 | 255 | 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. ## Heat treatment Supply condition - Quenching and Tempering d=25 - Annealing Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied. Source: [www.caishuku.com](https://www.caishuku.com/detail/azhlNWIxNDgyNQ__ "Source: www.caishuku.com") ## 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 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. [33NiCrMo6 1.6567 Ni 1,20-1,60 · Cr 0,85-1,15 - ΔNi 0.15 - ΔCr 0.15 - 1 designations](/materials/din-en/33nicrmo6 "33NiCrMo6")[1.6582 1.6582 Ni 1,30-1,70 · Cr 1,30-1,70 - ΔNi 0.05 - ΔCr 0.35 - 84 designations](/materials/material-no/1.6582 "1.6582")[41SiNiCrMoV7-6 1.6928 Ni 1,20-1,70 · Cr 0,60-1,00 - ΔNi 0.10 - ΔCr 0.35 - 7 designations](/materials/din-en/41sinicrmov7-6 "41SiNiCrMoV7-6")[40 NiCrMo 8 4 1.6562 Ni 1,65-2,00 · Cr 0,70-0,95 - ΔNi 0.28 - ΔCr 0.32 - 33 designations](/materials/din-en/40nicrmo8-4 "40 NiCrMo 8 4")[38NiCrMoV7-3 1.6926 Ni 1,60-2,00 · Cr 0,65-0,95 - ΔNi 0.25 - ΔCr 0.35 - 1 designations](/materials/din-en/38nicrmov7-3 "38NiCrMoV7-3") ## 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=95f2674c-e0c3-404c-b3b2-0a38a7dfd884 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.6565.pdf "Datasheet as PDF")