--- title: "20Mn2B — composition, equivalents and standards" description: "20Mn2B: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/gb/20mn2b language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gb/20mn2b.md cs: https://steelequivalents.com/cs/materiály/gb/20mn2b.md de: https://steelequivalents.com/de/werkstoffe/gb/20mn2b.md es: https://steelequivalents.com/es/materiales/gb/20mn2b.md fr: https://steelequivalents.com/fr/matériaux/gb/20mn2b.md hu: https://steelequivalents.com/hu/anyagok/gb/20mn2b.md it: https://steelequivalents.com/it/materiali/gb/20mn2b.md nl: https://steelequivalents.com/nl/materialen/gb/20mn2b.md pl: https://steelequivalents.com/pl/materiały/gb/20mn2b.md pt: https://steelequivalents.com/pt/materiais/gb/20mn2b.md ru: https://steelequivalents.com/ru/материалы/gb/20mn2b.md tr: https://steelequivalents.com/tr/malzemeler/gb/20mn2b.md zh: https://steelequivalents.com/zh/材料/gb/20mn2b.md ja: https://steelequivalents.com/ja/材料/gb/20mn2b.md ar: https://steelequivalents.com/ar/المواد/gb/20mn2b.md ko: https://steelequivalents.com/ko/재료/gb/20mn2b.md pt-br: https://steelequivalents.com/pt-br/materiais/gb/20mn2b.md hi: https://steelequivalents.com/hi/सामग्री/gb/20mn2b.md content_hash: sha256:1ed19e6110a717f304ef66b173564911c152f020f879defac8b81db218e721ca 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/gb/20mn2b > Canonical URL: https://steelequivalents.com/materials/gb/20mn2b > 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. GB · China · 1 designation # 20Mn2B 20Mn2B is a grade designated under GB. Its recorded composition includes C 0.17–0.24%, Si 0.17–0.37%, Cr ≤ 0.3%, Mn 1.5–1.8% and Ni ≤ 0.3%. No cross-standard equivalents are recorded for this grade yet. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=62f31083-f32c-4912-ab67-2ef4966f97e9&designation=e7e50a4e-4bf7-4290-8ec4-84efda9f0e41 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/20mn2b.pdf "Datasheet as PDF") ## Chemical composition 9 elements on file · weight % What this alloy is Fe Mn Cr Ni Iron — the balance, never listed by a standard — 96.9 % Mn — 1.7 % Cr — 0.3 % Ni — 0.3 % Traces & impurities · 0.8 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.17–0.24 | | Si | 0.17–0.37 | | Mn | 1.5–1.8 | | P | ≤ 0.035 | | S | ≤ 0.035 | | Cr | ≤ 0.3 | | Ni | ≤ 0.3 | | Cu | ≤ 0.3 | | B | 0.0005–0.0035 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel 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 | 0.0005-0.0035 | 0.001 | 0.004 | Range | | C | 0.17-0.24 | 0.170 | 0.240 | Range | | Si | 0.17-0.37 | 0.170 | 0.370 | Range | | P | ≤0.035 | — | 0.035 | Max | | S | ≤0.035 | — | 0.035 | Max | | Cr | ≤0.3 | — | 0.300 | Max | | Mn | 1.5-1.8 | 1.500 | 1.800 | Range | | Ni | ≤0.3 | — | 0.300 | Max | | Cu | ≤0.3 | — | 0.300 | Max | 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: Mo. ## 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=62f31083-f32c-4912-ab67-2ef4966f97e9&designation=e7e50a4e-4bf7-4290-8ec4-84efda9f0e41 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/20mn2b.pdf "Datasheet as PDF")