--- title: "70Si2CrA — composition, equivalents and standards" description: "70Si2CrA: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/gb/70si2cra language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gb/70si2cra.md cs: https://steelequivalents.com/cs/materiály/gb/70si2cra.md de: https://steelequivalents.com/de/werkstoffe/gb/70si2cra.md es: https://steelequivalents.com/es/materiales/gb/70si2cra.md fr: https://steelequivalents.com/fr/matériaux/gb/70si2cra.md hu: https://steelequivalents.com/hu/anyagok/gb/70si2cra.md it: https://steelequivalents.com/it/materiali/gb/70si2cra.md nl: https://steelequivalents.com/nl/materialen/gb/70si2cra.md pl: https://steelequivalents.com/pl/materiały/gb/70si2cra.md pt: https://steelequivalents.com/pt/materiais/gb/70si2cra.md ru: https://steelequivalents.com/ru/материалы/gb/70si2cra.md tr: https://steelequivalents.com/tr/malzemeler/gb/70si2cra.md zh: https://steelequivalents.com/zh/材料/gb/70si2cra.md ja: https://steelequivalents.com/ja/材料/gb/70si2cra.md ar: https://steelequivalents.com/ar/المواد/gb/70si2cra.md ko: https://steelequivalents.com/ko/재료/gb/70si2cra.md pt-br: https://steelequivalents.com/pt-br/materiais/gb/70si2cra.md hi: https://steelequivalents.com/hi/सामग्री/gb/70si2cra.md content_hash: sha256:bbbda66fd176920e213bbfc99b452948c17b42f1efa894ffc383983b47be534d generated: 2026-09-25 --- > **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/70si2cra > Canonical URL: https://steelequivalents.com/materials/gb/70si2cra > 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 # 70Si2CrA 70Si2CrA is a grade designated under GB. Its recorded composition includes C 0.65–0.75%, Si 1.4–1.7%, P ≤ 0.03%, Cr 0.2–0.4% and Mn 0.4–0.6%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include Rm 785–1177 N/mm² and A ≥ 8%; these figures vary with the delivery condition and dimension. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=e5646505-1d50-402a-a1fb-5f9d50ade581&designation=2c717157-7e0e-4cc8-9055-7569fd95e9f9 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/70si2cra.pdf "Datasheet as PDF") ## Chemical composition 7 elements on file · weight % What this alloy is Fe Si C Mn Iron — the balance, never listed by a standard — 96.9 % Si — 1.5 % C — 0.7 % Mn — 0.5 % Traces & impurities · 0.4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.65–0.75 | | Si | 1.4–1.7 | | Mn | 0.4–0.6 | | P | ≤ 0.03 | | S | ≤ 0.03 | | Cr | 0.2–0.4 | | Ni | ≤ 0.03 | Carbon Silicon Manganese Phosphorus Sulfur Chromium 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 | 0.65-0.75 | 0.650 | 0.750 | Range | | Si | 1.4-1.7 | 1.400 | 1.700 | Range | | P | ≤0.03 | — | 0.030 | Max | | S | ≤0.03 | — | 0.030 | Max | | Cr | 0.2-0.4 | 0.200 | 0.400 | Range | | Mn | 0.4-0.6 | 0.400 | 0.600 | Range | | Ni | ≤0.03 | — | 0.030 | 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. ## Properties by condition 0 conditions · 0 values 3 further values are held for this grade under a condition the source did not name — a bound with no quantity attached. They are withheld rather than shown against a guessed condition. ## Heat treatment Supply condition - Annealing Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied. Source: [www.caishuku.com](https://www.caishuku.com/detail/azhlNWIxODUyNg__ "Source: www.caishuku.com") ## 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=e5646505-1d50-402a-a1fb-5f9d50ade581&designation=2c717157-7e0e-4cc8-9055-7569fd95e9f9 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/70si2cra.pdf "Datasheet as PDF")