--- title: "ПК40Н4Д2М-6.8 — composition, equivalents and standards" description: "ПК40Н4Д2М-6.8 is a designation in GOST for the grade also listed as PK40N4D2M. We list 4 designations recorded for this grade, in the standards GOST." canonical: https://steelequivalents.com/materials/gost/pk40n4d2m-6-8 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gost/pk40n4d2m-6-8.md cs: https://steelequivalents.com/cs/materiály/gost/pk40n4d2m-6-8.md de: https://steelequivalents.com/de/werkstoffe/gost/pk40n4d2m-6-8.md es: https://steelequivalents.com/es/materiales/gost/pk40n4d2m-6-8.md fr: https://steelequivalents.com/fr/matériaux/gost/pk40n4d2m-6-8.md hu: https://steelequivalents.com/hu/anyagok/gost/pk40n4d2m-6-8.md it: https://steelequivalents.com/it/materiali/gost/pk40n4d2m-6-8.md nl: https://steelequivalents.com/nl/materialen/gost/pk40n4d2m-6-8.md pl: https://steelequivalents.com/pl/materiały/gost/pk40n4d2m-6-8.md pt: https://steelequivalents.com/pt/materiais/gost/pk40n4d2m-6-8.md ru: https://steelequivalents.com/ru/материалы/gost/пк40н4д2м-6.8.md tr: https://steelequivalents.com/tr/malzemeler/gost/pk40n4d2m-6-8.md zh: https://steelequivalents.com/zh/材料/gost/pk40n4d2m-6-8.md ja: https://steelequivalents.com/ja/材料/gost/pk40n4d2m-6-8.md ar: https://steelequivalents.com/ar/المواد/gost/pk40n4d2m-6-8.md ko: https://steelequivalents.com/ko/재료/gost/pk40n4d2m-6-8.md pt-br: https://steelequivalents.com/pt-br/materiais/gost/pk40n4d2m-6-8.md hi: https://steelequivalents.com/hi/सामग्री/gost/pk40n4d2m-6-8.md content_hash: sha256:22bd7bb13fdb6e02b601b7ab13cec7eca9c2c26b504ec182227e8d9ab8d219df 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/gost/pk40n4d2m-6-8 > Canonical URL: https://steelequivalents.com/materials/gost/pk40n4d2m-6-8 > 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. GOST · Russia / CIS · 4 designations # ПК40Н4Д2М-6.8 ПК40Н4Д2М-6.8 is a designation in GOST for the grade also listed as PK40N4D2M. We list 4 designations recorded for this grade, in the standards GOST. - *Designations* **4** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=098af049-8482-478d-b169-ebca2da27771&designation=f206dea5-c585-4085-92a8-01bdede79378 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/pk40n4d2m-6-8.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [GOST PK40N4D2M This grade’s own name](/materials/gost/pk40n4d2m "GOST PK40N4D2M") ## Also known as 4 designations · 1 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. GOST Russia / CIS · 4 - [PK40N4D2M This grade’s own name](/materials/gost/pk40n4d2m "GOST PK40N4D2M") - [ПК40Н4Д2М Indicative](/materials/gost/pk40n4d2m "GOST ПК40Н4Д2М") - **ПК40Н4Д2М-6.8 Indicative** - [ПК40Н4Д2М-7.4 Indicative](/materials/gost/pk40n4d2m-7-4 "GOST ПК40Н4Д2М-7.4") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 4 elements on file · weight % What this alloy is Fe Ni Cu Mo Iron — the balance, never listed by a standard — 93 % Ni — 4 % Cu — 2 % Mo — 0.5 % Traces & impurities · 0.5 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.31–0.6 | | Mo | 0.3–0.7 | | Ni | 3–5 | | Cu | 1–3 | Carbon Molybdenum Nickel Copper 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 | 0.31 - 0.6 | 0.310 | 0.600 | Range | | Ni | 3 - 5 | 3.000 | 5.000 | Range | | Cu | 1 - 3 | 1.000 | 3.000 | Range | | Mo | 0.3 - 0.7 | 0.300 | 0.700 | 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: Mn, Si, Cr. ## Physical & mechanical properties 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=098af049-8482-478d-b169-ebca2da27771&designation=f206dea5-c585-4085-92a8-01bdede79378 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/pk40n4d2m-6-8.pdf "Datasheet as PDF")