--- title: "C70G — Steels for surface hardening" description: "C70G: 4 equivalent designations across 3 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/c70g language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/c70g.md cs: https://steelequivalents.com/cs/materiály/din-en/c70g.md de: https://steelequivalents.com/de/werkstoffe/din-en/c70g.md es: https://steelequivalents.com/es/materiales/din-en/c70g.md fr: https://steelequivalents.com/fr/matériaux/din-en/c70g.md hu: https://steelequivalents.com/hu/anyagok/din-en/c70g.md it: https://steelequivalents.com/it/materiali/din-en/c70g.md nl: https://steelequivalents.com/nl/materialen/din-en/c70g.md pl: https://steelequivalents.com/pl/materiały/din-en/c70g.md pt: https://steelequivalents.com/pt/materiais/din-en/c70g.md ru: https://steelequivalents.com/ru/материалы/din-en/c70g.md tr: https://steelequivalents.com/tr/malzemeler/din-en/c70g.md zh: https://steelequivalents.com/zh/材料/din-en/c70g.md ja: https://steelequivalents.com/ja/材料/din-en/c70g.md ar: https://steelequivalents.com/ar/المواد/din-en/c70g.md ko: https://steelequivalents.com/ko/재료/din-en/c70g.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/c70g.md hi: https://steelequivalents.com/hi/सामग्री/din-en/c70g.md content_hash: sha256:40dc53d1a7ae84a1802eb8211d601530006b21149e9a72a2ec1d38155e1b6a25 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/din-en/c70g > Canonical URL: https://steelequivalents.com/materials/din-en/c70g > 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. DIN / EN · Europe · 4 designations # C70G C70G is a material in the category [Steels for surface hardening](/categories/steels-for-surface-hardening "Steels for surface hardening"), held under material number 1.1249. Its recorded composition includes C 0.68–0.75%, Si 0.15–0.35%, P 0.025%, S 0.035% and Mn 0.2–0.35%. We list 3 designations recorded for this grade, in the standards DIN / EN, AISI / SAE and ČSN. Its recorded density is 7.66 g/cm³. - [*Material no.* **1.1249**](/materials/material-no/1.1249 "Material no.: 1.1249") - [*Category* **Steels for surface hardening · 13 grades**](/categories/steels-for-surface-hardening "Category: Steels for surface hardening · 13 grades") - *Designations* **4** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=f7796ab3-29ca-400c-a260-3fde4e5c72f1&designation=cb06d89e-2358-4831-a3ef-6107a7e6498d "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/c70g.pdf "Datasheet as PDF") ## About Steels for surface hardening Steels for surface hardening are steels designed to develop a hard, wear-resistant surface while retaining a tougher interior. They are used for gears, shafts and other machine parts where resistance to surface wear is needed together with resistance to impact and bending. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 4 designations · 3 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. DIN / EN Europe · 2 - **C70G This grade’s own name Withdrawn** - [Cf 70 This grade’s own name Withdrawn](/materials/din-en/cf-70 "DIN / EN Cf 70") AISI / SAE United States · 1 - [1074 Indicative](/materials/aisi-sae/1074 "AISI / SAE 1074") ČSN Czechia · 1 - [12081 Indicative](/materials/csn/12081 "ČSN 12081") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 5 elements on file · weight % What this alloy is Fe C Mn Si Iron — the balance, never listed by a standard — 98.7 % C — 0.7 % Mn — 0.3 % Si — 0.3 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.68–0.75 | | Si | 0.15–0.35 | | Mn | 0.2–0.35 | | P | 0.025 | | S | 0.035 | Carbon Silicon Manganese Phosphorus Sulfur 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 | 0,68-0,75 | 0.680 | 0.750 | Range | | Si | 0,15-0,35 | 0.150 | 0.350 | Range | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Mn | 0,20-0,35 | 0.200 | 0.350 | 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, Cr, Mo. ## Physical & mechanical properties Density 7,66 g/cm³ Exact 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=f7796ab3-29ca-400c-a260-3fde4e5c72f1&designation=cb06d89e-2358-4831-a3ef-6107a7e6498d "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/c70g.pdf "Datasheet as PDF")