--- title: "55Х6В3СМФ — composition, equivalents and standards" description: "55Х6В3СМФ: 4 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/gost/55kh6v3smf language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gost/55kh6v3smf.md cs: https://steelequivalents.com/cs/materiály/gost/55kh6v3smf.md de: https://steelequivalents.com/de/werkstoffe/gost/55kh6v3smf.md es: https://steelequivalents.com/es/materiales/gost/55kh6v3smf.md fr: https://steelequivalents.com/fr/matériaux/gost/55kh6v3smf.md hu: https://steelequivalents.com/hu/anyagok/gost/55kh6v3smf.md it: https://steelequivalents.com/it/materiali/gost/55kh6v3smf.md nl: https://steelequivalents.com/nl/materialen/gost/55kh6v3smf.md pl: https://steelequivalents.com/pl/materiały/gost/55kh6v3smf.md pt: https://steelequivalents.com/pt/materiais/gost/55kh6v3smf.md ru: https://steelequivalents.com/ru/материалы/gost/55х6в3смф.md tr: https://steelequivalents.com/tr/malzemeler/gost/55kh6v3smf.md zh: https://steelequivalents.com/zh/材料/gost/55kh6v3smf.md ja: https://steelequivalents.com/ja/材料/gost/55kh6v3smf.md ar: https://steelequivalents.com/ar/المواد/gost/55kh6v3smf.md ko: https://steelequivalents.com/ko/재료/gost/55kh6v3smf.md pt-br: https://steelequivalents.com/pt-br/materiais/gost/55kh6v3smf.md hi: https://steelequivalents.com/hi/सामग्री/gost/55kh6v3smf.md content_hash: sha256:10bfd61d7278c6f00fa3bbcf97a755b86c676ded331e66e48f0fa88ebc1bd7fa 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/55kh6v3smf > Canonical URL: https://steelequivalents.com/materials/gost/55kh6v3smf > 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 # 55Х6В3СМФ 6KH6V3MFS is a grade designated under GOST. Its recorded composition includes C 0.5–0.6%, Si 0.6–0.9%, Cr 5.5–6.5%, Mo 0.6–0.9% and W 2.5–3.2%. We list 3 designations recorded for this grade, in the standards GOST. Recorded mechanical properties include Re 1800–2000 N/mm² and HB 255. Recorded transformation points: Ac1 875 °C, Ac3 905 °C and Ar1 755 °C. - *Designations* **4** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=5e6b02b6-3db9-46c4-99a6-3d7e8d58ec6d&designation=2dd0b876-59bd-4e61-b5b9-5cd9d32c6615 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/55kh6v3smf.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [GOST 6KH6V3MFS This grade’s own name](/materials/gost/6kh6v3mfs "GOST 6KH6V3MFS") ## 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 - **55Х6В3СМФ Indicative** - [6KH6V3MFS This grade’s own name](/materials/gost/6kh6v3mfs "GOST 6KH6V3MFS") - [6Х6В3МФС Indicative](/materials/gost/6kh6v3mfs "GOST 6Х6В3МФС") - [ЭП569 Indicative](/materials/gost/ep569 "GOST ЭП569") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 11 elements on file · weight % What this alloy is Fe Cr W Si Iron — the balance, never listed by a standard — 87.4 % Cr — 6 % W — 2.9 % Si — 0.8 % Traces & impurities · 3 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.5–0.6 | | Si | 0.6–0.9 | | Mn | 0.15–0.45 | | P | ≤ 0.03 | | S | ≤ 0.03 | | Cr | 5.5–6.5 | | Mo | 0.6–0.9 | | Ni | ≤ 0.4 | | V | 0.5–0.8 | | W | 2.5–3.2 | | Cu | ≤ 0.3 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Vanadium Tungsten 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 | 0.5 - 0.6 | 0.500 | 0.600 | Range | | Si | 0.6 - 0.9 | 0.600 | 0.900 | Range | | P | max 0.03 | — | 0.030 | Max | | S | max 0.03 | — | 0.030 | Max | | V | 0.5 - 0.8 | 0.500 | 0.800 | Range | | Cr | 5.5 - 6.5 | 5.500 | 6.500 | Range | | Mn | 0.15 - 0.45 | 0.150 | 0.450 | Range | | Ni | max 0.4 | — | 0.400 | Max | | Cu | max 0.3 | — | 0.300 | Max | | Mo | 0.6 - 0.9 | 0.600 | 0.900 | Range | | W | 2.5 - 3.2 | 2.500 | 3.200 | 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 This grade's composition falls outside the published model's validated range (a low-alloy composition window), so no transformation temperature is predicted here. ## Physical & mechanical properties Transformation point Ac1 875 °C Exact Transformation point Ac3 905 °C Exact · Ac3(Acm) Transformation point Ar1 755 °C 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 2 conditions · 2 values By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Re N/mm² | |---|---| | Quenching and drawing | 1800 – 2000 | By delivery state**no delivery state stated** source `splav` | Delivery state | HB | |---|---| | 6KH6V3MFS ( 6Х6В3МФС ) (annealing) , GOST 5950-2000 | 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. ## 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=5e6b02b6-3db9-46c4-99a6-3d7e8d58ec6d&designation=2dd0b876-59bd-4e61-b5b9-5cd9d32c6615 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/55kh6v3smf.pdf "Datasheet as PDF")