--- title: "12G2SD — composition, equivalents and standards" description: "12G2SD is a designation in GOST for the grade also listed as 12G2A. We list 11 designations recorded for this grade, in the standards GOST." canonical: https://steelequivalents.com/materials/gost/12g2sd language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gost/12g2sd.md cs: https://steelequivalents.com/cs/materiály/gost/12g2sd.md de: https://steelequivalents.com/de/werkstoffe/gost/12g2sd.md es: https://steelequivalents.com/es/materiales/gost/12g2sd.md fr: https://steelequivalents.com/fr/matériaux/gost/12g2sd.md hu: https://steelequivalents.com/hu/anyagok/gost/12g2sd.md it: https://steelequivalents.com/it/materiali/gost/12g2sd.md nl: https://steelequivalents.com/nl/materialen/gost/12g2sd.md pl: https://steelequivalents.com/pl/materiały/gost/12g2sd.md pt: https://steelequivalents.com/pt/materiais/gost/12g2sd.md ru: https://steelequivalents.com/ru/материалы/gost/12g2sd.md tr: https://steelequivalents.com/tr/malzemeler/gost/12g2sd.md zh: https://steelequivalents.com/zh/材料/gost/12g2sd.md ja: https://steelequivalents.com/ja/材料/gost/12g2sd.md ar: https://steelequivalents.com/ar/المواد/gost/12g2sd.md ko: https://steelequivalents.com/ko/재료/gost/12g2sd.md pt-br: https://steelequivalents.com/pt-br/materiais/gost/12g2sd.md hi: https://steelequivalents.com/hi/सामग्री/gost/12g2sd.md content_hash: sha256:4a2f89802b0313f0e81749077d761ada30dc6d59950950ba8992073c10e1c195 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/12g2sd > Canonical URL: https://steelequivalents.com/materials/gost/12g2sd > 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 · 11 designations # 12G2SD 12G2SD is a designation in GOST for the grade also listed as 12G2A. We list 11 designations recorded for this grade, in the standards GOST. - *Designations* **11** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=163e1b20-f460-4e6a-8a7f-d0dedf8eae46&designation=f7ef2a95-c0d2-4543-b214-7fd6c216608f "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/12g2sd.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [GOST 12Kh2MFSR This grade’s own name](/materials/gost/12kh2mfsr "GOST 12Kh2MFSR") ## Also known as 11 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 · 11 - [12G2A Indicative](/materials/gost/12g2a "GOST 12G2A") - [12G2F Indicative](/materials/gost/12g2f "GOST 12G2F") - [12G2FD Indicative](/materials/gost/12g2fd "GOST 12G2FD") - [12G2S Indicative](/materials/gost/12g2s "GOST 12G2S") - [12G2SB Indicative](/materials/gost/12g2sb "GOST 12G2SB") - **12G2SD Indicative** - [12Kh2M Indicative](/materials/gost/12kh2m "GOST 12Kh2M") - [12Kh2MFSR This grade’s own name](/materials/gost/12kh2mfsr "GOST 12Kh2MFSR") - [12KhN2MDF Indicative](/materials/gost/12khn2mdf "GOST 12KhN2MDF") - [12Х2М-ВД Indicative](/materials/gost/12kh2m-vd "GOST 12Х2М-ВД") - [12Х2МФСР Indicative](/materials/gost/12kh2mfsr "GOST 12Х2МФСР") 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 Mo Si Iron — the balance, never listed by a standard — 95.6 % Cr — 1.8 % Mo — 0.6 % Si — 0.6 % Traces & impurities · 1.5 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.08–0.15 | | Si | 0.4–0.7 | | Mn | 0.4–0.7 | | P | ≤ 0.025 | | S | ≤ 0.025 | | Cr | 1.6–1.9 | | Mo | 0.5–0.7 | | Ni | ≤ 0.25 | | V | 0.2–0.35 | | Cu | ≤ 0.25 | | B | 0.002–0.005 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Vanadium Copper Boron 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 | |---|---|---|---|---| | B | 0.002 - 0.005 | 0.002 | 0.005 | Range | | C | 0.08 - 0.15 | 0.080 | 0.150 | Range | | Si | 0.4 - 0.7 | 0.400 | 0.700 | Range | | P | max 0.025 | — | 0.025 | Max | | S | max 0.025 | — | 0.025 | Max | | V | 0.2 - 0.35 | 0.200 | 0.350 | Range | | Cr | 1.6 - 1.9 | 1.600 | 1.900 | Range | | Mn | 0.4 - 0.7 | 0.400 | 0.700 | Range | | Ni | max 0.25 | — | 0.250 | Max | | Cu | max 0.25 | — | 0.250 | Max | | Mo | 0.5 - 0.7 | 0.500 | 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 computed from composition · °C Predicted Ae3 841 °C Predicted Ae1 769 °C Predicted Acm 447 °C Predicted Bs 507 °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 Transformation point Ac1 775 °C Exact Transformation point Ac3 865 °C Exact · Ac3(Acm) Transformation point Ar3 770 °C Exact · Ar3(Arcm) Transformation point Ar1 715 °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 · 22 values By dimension**no delivery state stated** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Ø 42 x 6 | 240 | 480 | 24 | — | 2700 | | Ø 32 x 5 | 530 | 330 | 22 | — | 2300 | | Ø 273 x 36 | 600 | 440 | 24 | 72 | 1900 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | |---|---|---|---| | 20 | 7.8 | — | 29.4 | | 100 | — | 10.95 | — | | 200 | — | 11.95 | — | | 300 | — | 12.65 | — | | 400 | — | 13.15 | — | | 500 | — | 13.7 | — | | 600 | — | 14 | — | | 700 | — | 14.3 | — | 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=163e1b20-f460-4e6a-8a7f-d0dedf8eae46&designation=f7ef2a95-c0d2-4543-b214-7fd6c216608f "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/12g2sd.pdf "Datasheet as PDF")