--- title: "00Х20Н20М4Б — composition, equivalents and standards" description: "00Х20Н20М4Б: 4 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/gost/00kh20n20m4b language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gost/00kh20n20m4b.md cs: https://steelequivalents.com/cs/materiály/gost/00kh20n20m4b.md de: https://steelequivalents.com/de/werkstoffe/gost/00kh20n20m4b.md es: https://steelequivalents.com/es/materiales/gost/00kh20n20m4b.md fr: https://steelequivalents.com/fr/matériaux/gost/00kh20n20m4b.md hu: https://steelequivalents.com/hu/anyagok/gost/00kh20n20m4b.md it: https://steelequivalents.com/it/materiali/gost/00kh20n20m4b.md nl: https://steelequivalents.com/nl/materialen/gost/00kh20n20m4b.md pl: https://steelequivalents.com/pl/materiały/gost/00kh20n20m4b.md pt: https://steelequivalents.com/pt/materiais/gost/00kh20n20m4b.md ru: https://steelequivalents.com/ru/материалы/gost/00х20н20м4б.md tr: https://steelequivalents.com/tr/malzemeler/gost/00kh20n20m4b.md zh: https://steelequivalents.com/zh/材料/gost/00kh20n20m4b.md ja: https://steelequivalents.com/ja/材料/gost/00kh20n20m4b.md ar: https://steelequivalents.com/ar/المواد/gost/00kh20n20m4b.md ko: https://steelequivalents.com/ko/재료/gost/00kh20n20m4b.md pt-br: https://steelequivalents.com/pt-br/materiais/gost/00kh20n20m4b.md hi: https://steelequivalents.com/hi/सामग्री/gost/00kh20n20m4b.md content_hash: sha256:d1e79c5423d1e870b282acb3240fc0e28bd52bcd8224d9303736771204ad3741 generated: 2026-09-22 --- > **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/00kh20n20m4b > Canonical URL: https://steelequivalents.com/materials/gost/00kh20n20m4b > 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 # 00Х20Н20М4Б 03KH21N21M4GB is a grade designated under GOST. Its recorded composition includes C ≤ 0.03%, Cr 20–22%, Mn 1.8–2.5%, Ni 20–22% and Mo 3.4–3.7%. We list 3 designations recorded for this grade, in the standards GOST. Recorded mechanical properties include Rm 490–590 N/mm², Re 215–295 N/mm² and A5 25–30%; these figures vary with the delivery condition and dimension. Its weldability is recorded as good. - *Designations* **4** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=00c43927-6c66-4f11-af07-298f2f623323&designation=0726c001-f62a-4356-a8e7-7cafc11be1fc "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/00kh20n20m4b.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [GOST 03KH21N21M4GB This grade’s own name](/materials/gost/03kh21n21m4gb "GOST 03KH21N21M4GB") ## 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 - **00Х20Н20М4Б Indicative** - [03KH21N21M4GB This grade’s own name](/materials/gost/03kh21n21m4gb "GOST 03KH21N21M4GB") - [03Х21Н21М4ГБ Indicative](/materials/gost/03kh21n21m4gb "GOST 03Х21Н21М4ГБ") - [ЭИ35 Indicative](/materials/gost/ei35 "GOST ЭИ35") 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 Cr Ni Mo Iron — the balance, never listed by a standard — 51.6 % Cr — 21 % Ni — 21 % Mo — 3.6 % Traces & impurities · 2.8 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.03 | | Si | ≤ 0.6 | | Mn | 1.8–2.5 | | P | ≤ 0.03 | | S | ≤ 0.02 | | Cr | 20–22 | | Mo | 3.4–3.7 | | Ni | 20–22 | 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 | max 0.03 | — | 0.030 | Max | | Si | max 0.6 | — | 0.600 | Max | | P | max 0.03 | — | 0.030 | Max | | S | max 0.02 | — | 0.020 | Max | | Cr | 20 - 22 | 20.000 | 22.000 | Range | | Mn | 1.8 - 2.5 | 1.800 | 2.500 | Range | | Ni | 20 - 22 | 20.000 | 22.000 | Range | | Mo | 3.4 - 3.7 | 3.400 | 3.700 | 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 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 Weldability readily weldable As published: without limitations. 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 3 conditions · 8 values By dimension**no delivery state stated** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | |---|---|---| | to 600 | 490 | 215 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | |---|---|---|---| | Sheet trick, GOST 7350-77 | 590 | 295 | 30 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | |---|---|---|---| | Sheet thin, GOST 5582-75 | 540 | 245 | 25 | 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=00c43927-6c66-4f11-af07-298f2f623323&designation=0726c001-f62a-4356-a8e7-7cafc11be1fc "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/00kh20n20m4b.pdf "Datasheet as PDF")