--- title: "55SiMnMoVNb — composition, equivalents and standards" description: "55SiMnMoVNb: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/gb/55simnmovnb language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gb/55simnmovnb.md cs: https://steelequivalents.com/cs/materiály/gb/55simnmovnb.md de: https://steelequivalents.com/de/werkstoffe/gb/55simnmovnb.md es: https://steelequivalents.com/es/materiales/gb/55simnmovnb.md fr: https://steelequivalents.com/fr/matériaux/gb/55simnmovnb.md hu: https://steelequivalents.com/hu/anyagok/gb/55simnmovnb.md it: https://steelequivalents.com/it/materiali/gb/55simnmovnb.md nl: https://steelequivalents.com/nl/materialen/gb/55simnmovnb.md pl: https://steelequivalents.com/pl/materiały/gb/55simnmovnb.md pt: https://steelequivalents.com/pt/materiais/gb/55simnmovnb.md ru: https://steelequivalents.com/ru/материалы/gb/55simnmovnb.md tr: https://steelequivalents.com/tr/malzemeler/gb/55simnmovnb.md zh: https://steelequivalents.com/zh/材料/gb/55simnmovnb.md ja: https://steelequivalents.com/ja/材料/gb/55simnmovnb.md ar: https://steelequivalents.com/ar/المواد/gb/55simnmovnb.md ko: https://steelequivalents.com/ko/재료/gb/55simnmovnb.md pt-br: https://steelequivalents.com/pt-br/materiais/gb/55simnmovnb.md hi: https://steelequivalents.com/hi/सामग्री/gb/55simnmovnb.md content_hash: sha256:d6d1e4dc7982e2aed0e257a3ff84f55880a51494dd04a604fbfd5c4616bb60a7 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/55simnmovnb > Canonical URL: https://steelequivalents.com/materials/gb/55simnmovnb > 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 # 55SiMnMoVNb 55SiMnMoVNb is a grade designated under GB. Its recorded composition includes C 0.52–0.6%, Si 0.4–0.7%, Cr ≤ 0.35%, Mn 1–1.3% and Mo 0.3–0.4%. No cross-standard equivalents are recorded for this grade yet. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=19a923af-139f-4060-b014-3911a20e98a8&designation=65db9cf5-2bdc-46df-8666-0f4bf3a0a31c "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/55simnmovnb.pdf "Datasheet as PDF") ## Chemical composition 11 elements on file · weight % What this alloy is Fe Mn C Si Iron — the balance, never listed by a standard — 96.4 % Mn — 1.2 % C — 0.6 % Si — 0.6 % Traces & impurities · 1.4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.52–0.6 | | Si | 0.4–0.7 | | Mn | 1–1.3 | | P | ≤ 0.04 | | S | ≤ 0.04 | | Cr | ≤ 0.35 | | Mo | 0.3–0.4 | | V | 0.08–0.15 | | W | 0.2–0.3 | | Cu | ≤ 0.2 | | Nb | 0.01–0.03 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Vanadium Tungsten Copper Niobium 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 | 0.52-0.6 | 0.520 | 0.600 | Range | | Si | 0.4-0.7 | 0.400 | 0.700 | Range | | P | ≤0.04 | — | 0.040 | Max | | S | ≤0.04 | — | 0.040 | Max | | V | 0.08-0.15 | 0.080 | 0.150 | Range | | Cr | ≤0.35 | — | 0.350 | Max | | Mn | 1-1.3 | 1.000 | 1.300 | Range | | Cu | ≤0.2 | — | 0.200 | Max | | Nb | 0.01-0.03 | 0.010 | 0.030 | Range | | Mo | 0.3-0.4 | 0.300 | 0.400 | Range | | W | 0.2-0.3 | 0.200 | 0.300 | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni. ## 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=19a923af-139f-4060-b014-3911a20e98a8&designation=65db9cf5-2bdc-46df-8666-0f4bf3a0a31c "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/55simnmovnb.pdf "Datasheet as PDF")