--- title: "ЭИ-981А — composition, equivalents and standards" description: "ЭИ-981А is a designation in GOST for the grade also listed as Sv-09Kh16N25M6AF. We list 3 designations recorded for this grade, in the standards GOST." canonical: https://steelequivalents.com/materials/gost/ei-981a language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gost/ei-981a.md cs: https://steelequivalents.com/cs/materiály/gost/ei-981a.md de: https://steelequivalents.com/de/werkstoffe/gost/ei-981a.md es: https://steelequivalents.com/es/materiales/gost/ei-981a.md fr: https://steelequivalents.com/fr/matériaux/gost/ei-981a.md hu: https://steelequivalents.com/hu/anyagok/gost/ei-981a.md it: https://steelequivalents.com/it/materiali/gost/ei-981a.md nl: https://steelequivalents.com/nl/materialen/gost/ei-981a.md pl: https://steelequivalents.com/pl/materiały/gost/ei-981a.md pt: https://steelequivalents.com/pt/materiais/gost/ei-981a.md ru: https://steelequivalents.com/ru/материалы/gost/эи-981а.md tr: https://steelequivalents.com/tr/malzemeler/gost/ei-981a.md zh: https://steelequivalents.com/zh/材料/gost/ei-981a.md ja: https://steelequivalents.com/ja/材料/gost/ei-981a.md ar: https://steelequivalents.com/ar/المواد/gost/ei-981a.md ko: https://steelequivalents.com/ko/재료/gost/ei-981a.md pt-br: https://steelequivalents.com/pt-br/materiais/gost/ei-981a.md hi: https://steelequivalents.com/hi/सामग्री/gost/ei-981a.md content_hash: sha256:751308f3e9faf47934aee3e8a3865ef3e19130ad10f6ed6ec9b21dba35472f96 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/ei-981a > Canonical URL: https://steelequivalents.com/materials/gost/ei-981a > 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 · 3 designations # ЭИ-981А ЭИ-981А is a designation in GOST for the grade also listed as Sv-09Kh16N25M6AF. We list 3 designations recorded for this grade, in the standards GOST. - *Designations* **3** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=3f942a9d-2d96-47b0-bae2-a941dbacc2c7&designation=40e9dbff-f3d1-475f-b003-b66a2dad27d8 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/ei-981a.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [GOST Sv-09Kh16N25M6AF This grade’s own name](/materials/gost/sv-09kh16n25m6af "GOST Sv-09Kh16N25M6AF") ## Also known as 3 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 · 3 - [Sv-09Kh16N25M6AF This grade’s own name](/materials/gost/sv-09kh16n25m6af "GOST Sv-09Kh16N25M6AF") - [Св-09Х16Н25М6АФ Indicative](/materials/gost/sv-09kh16n25m6af "GOST Св-09Х16Н25М6АФ") - **ЭИ-981А Indicative** Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 10 elements on file · weight % What this alloy is Fe Ni Cr Mo Iron — the balance, never listed by a standard — 49.2 % Ni — 25.5 % Cr — 16 % Mo — 6.3 % Traces & impurities · 3 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.07–0.11 | | Si | ≤ 0.4 | | Mn | 1–2 | | P | ≤ 0.018 | | S | ≤ 0.018 | | Cr | 15–17 | | Mo | 5.5–7 | | Ni | 24–27 | | V | 0.7–1 | | N | 0.1–0.2 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Vanadium Nitrogen 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 | 0.07 - 0.11 | 0.070 | 0.110 | Range | | N | 0.1 - 0.2 | 0.100 | 0.200 | Range | | Si | max 0.4 | — | 0.400 | Max | | P | max 0.018 | — | 0.018 | Max | | S | max 0.018 | — | 0.018 | Max | | V | 0.7 - 1 | 0.700 | 1.000 | Range | | Cr | 15 - 17 | 15.000 | 17.000 | Range | | Mn | 1 - 2 | 1.000 | 2.000 | Range | | Ni | 24 - 27 | 24.000 | 27.000 | Range | | Mo | 5.5 - 7 | 5.500 | 7.000 | 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 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=3f942a9d-2d96-47b0-bae2-a941dbacc2c7&designation=40e9dbff-f3d1-475f-b003-b66a2dad27d8 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/ei-981a.pdf "Datasheet as PDF")