--- title: "55SiCrA — composition, equivalents and standards" description: "55SiCrA: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/gb/55sicra language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gb/55sicra.md cs: https://steelequivalents.com/cs/materiály/gb/55sicra.md de: https://steelequivalents.com/de/werkstoffe/gb/55sicra.md es: https://steelequivalents.com/es/materiales/gb/55sicra.md fr: https://steelequivalents.com/fr/matériaux/gb/55sicra.md hu: https://steelequivalents.com/hu/anyagok/gb/55sicra.md it: https://steelequivalents.com/it/materiali/gb/55sicra.md nl: https://steelequivalents.com/nl/materialen/gb/55sicra.md pl: https://steelequivalents.com/pl/materiały/gb/55sicra.md pt: https://steelequivalents.com/pt/materiais/gb/55sicra.md ru: https://steelequivalents.com/ru/материалы/gb/55sicra.md tr: https://steelequivalents.com/tr/malzemeler/gb/55sicra.md zh: https://steelequivalents.com/zh/材料/gb/55sicra.md ja: https://steelequivalents.com/ja/材料/gb/55sicra.md ar: https://steelequivalents.com/ar/المواد/gb/55sicra.md ko: https://steelequivalents.com/ko/재료/gb/55sicra.md pt-br: https://steelequivalents.com/pt-br/materiais/gb/55sicra.md hi: https://steelequivalents.com/hi/सामग्री/gb/55sicra.md content_hash: sha256:ed745ee76fe71ac1edf0998768178e843b69ab836cf1d89935239cf83b6f6239 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/55sicra > Canonical URL: https://steelequivalents.com/materials/gb/55sicra > 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 # 55SiCrA 55SiCrA is a grade designated under GB. Its recorded composition includes C 0.51–0.59%, Si 1.2–1.6%, Cr 0.5–0.8%, Mn 0.5–0.8% and Ni ≤ 0.35%. No cross-standard equivalents are recorded for this grade yet. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=45e3ddd7-5715-4be0-8b96-73b8236ef559&designation=211eb7bf-028f-4933-aecb-52aaff071178 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/55sicra.pdf "Datasheet as PDF") ## Chemical composition 8 elements on file · weight % What this alloy is Fe Si Mn Cr Iron — the balance, never listed by a standard — 96.1 % Si — 1.4 % Mn — 0.7 % Cr — 0.7 % Traces & impurities · 1.2 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.51–0.59 | | Si | 1.2–1.6 | | Mn | 0.5–0.8 | | P | ≤ 0.025 | | S | ≤ 0.025 | | Cr | 0.5–0.8 | | Ni | ≤ 0.35 | | Cu | ≤ 0.25 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel Copper 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 | 0.51-0.59 | 0.510 | 0.590 | Range | | Si | 1.2-1.6 | 1.200 | 1.600 | Range | | P | ≤0.025 | — | 0.025 | Max | | S | ≤0.025 | — | 0.025 | Max | | Cr | 0.5-0.8 | 0.500 | 0.800 | Range | | Mn | 0.5-0.8 | 0.500 | 0.800 | Range | | Ni | ≤0.35 | — | 0.350 | Max | | Cu | ≤0.25 | — | 0.250 | 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=45e3ddd7-5715-4be0-8b96-73b8236ef559&designation=211eb7bf-028f-4933-aecb-52aaff071178 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/55sicra.pdf "Datasheet as PDF")