--- title: "C45G — Steels for surface hardening" description: "C45G: 5 equivalent designations across 4 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/c45g language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/c45g.md cs: https://steelequivalents.com/cs/materiály/din-en/c45g.md de: https://steelequivalents.com/de/werkstoffe/din-en/c45g.md es: https://steelequivalents.com/es/materiales/din-en/c45g.md fr: https://steelequivalents.com/fr/matériaux/din-en/c45g.md hu: https://steelequivalents.com/hu/anyagok/din-en/c45g.md it: https://steelequivalents.com/it/materiali/din-en/c45g.md nl: https://steelequivalents.com/nl/materialen/din-en/c45g.md pl: https://steelequivalents.com/pl/materiały/din-en/c45g.md pt: https://steelequivalents.com/pt/materiais/din-en/c45g.md ru: https://steelequivalents.com/ru/материалы/din-en/c45g.md tr: https://steelequivalents.com/tr/malzemeler/din-en/c45g.md zh: https://steelequivalents.com/zh/材料/din-en/c45g.md ja: https://steelequivalents.com/ja/材料/din-en/c45g.md ar: https://steelequivalents.com/ar/المواد/din-en/c45g.md ko: https://steelequivalents.com/ko/재료/din-en/c45g.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/c45g.md hi: https://steelequivalents.com/hi/सामग्री/din-en/c45g.md content_hash: sha256:f59a184ccb55f82551f151b452f5456ef263d424f5599ca8e7f1dede2fb26444 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/c45g > Canonical URL: https://steelequivalents.com/materials/din-en/c45g > 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 · 5 designations # C45G Cf 45 is a material in the category [Steels for surface hardening](/categories/steels-for-surface-hardening "Steels for surface hardening"), held under material number 1.1193. Its recorded composition includes C 0.43–0.49%, Si 0.15–0.35%, P 0.025%, S 0.035% and Mn 0.5–0.8%. We list 4 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE and ASTM. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.1193**](/materials/material-no/1.1193 "Material no.: 1.1193") - [*Category* **Steels for surface hardening · 13 grades**](/categories/steels-for-surface-hardening "Category: Steels for surface hardening · 13 grades") - *Designations* **5** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=faed6c8b-cbff-4fa5-b486-3d46e5e076cc&designation=012af02b-1f20-4cc9-ae57-4ccbec3873da "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/c45g.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [UNS G10450 This grade’s own name · 7 grades on that route](/materials/uns/g10450 "UNS G10450") - [AISI / SAE 1045 This grade’s own name · 8 grades on that route](/materials/aisi-sae/1045 "AISI / SAE 1045") ## 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 5 designations · 4 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 - **C45G This grade’s own name Withdrawn** - [Cf 45 This grade’s own name Withdrawn](/materials/din-en/cf45 "DIN / EN Cf 45") UNS United States · 1 - [G10450 This grade’s own name](/materials/uns/g10450 "UNS G10450") AISI / SAE United States · 1 - [1045 This grade’s own name](/materials/aisi-sae/1045 "AISI / SAE 1045") ASTM United States · 1 - [A830 Indicative](/materials/astm/a830 "ASTM A830") 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 Mn C Si Iron — the balance, never listed by a standard — 98.6 % Mn — 0.7 % C — 0.5 % 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 | 0.43–0.49 | | Si | 0.15–0.35 | | Mn | 0.5–0.8 | | 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 | 0,43-0,49 | 0.430 | 0.490 | 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 | 0,50-0,80 | 0.500 | 0.800 | 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 7,85 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. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.1, a shared category, and a published range for Mn / Si that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade. [1.1183 1.1183 Mn 0,50-0,80 · Si 0,15-0,35 - ΔMn 0.00 - ΔSi 0.00 - 10 designations](/materials/material-no/1.1183 "1.1183")[1.1213 1.1213 Mn 0,40-0,70 · Si 0,15-0,35 - ΔMn 0.10 - ΔSi 0.00 - 20 designations](/materials/material-no/1.1213 "1.1213")[C53E 1.1210 Mn 0,60-0,90 · Si ≤0,40 - ΔMn 0.10 - ΔSi 0.05 - 12 designations](/materials/din-en/c53e "C53E")[C50R 1.1241 Mn 0,60-0,90 · Si ≤0,40 - ΔMn 0.10 - ΔSi 0.05 - 12 designations](/materials/din-en/c50r "C50R") ## 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=faed6c8b-cbff-4fa5-b486-3d46e5e076cc&designation=012af02b-1f20-4cc9-ae57-4ccbec3873da "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/c45g.pdf "Datasheet as PDF")