--- title: "C45 C45E C45R — composition, equivalents and standards" description: "C45 C45E C45R: 4 equivalent designations across 4 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/bs/c45-c45e-c45r language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/bs/c45-c45e-c45r.md cs: https://steelequivalents.com/cs/materiály/bs/c45-c45e-c45r.md de: https://steelequivalents.com/de/werkstoffe/bs/c45-c45e-c45r.md es: https://steelequivalents.com/es/materiales/bs/c45-c45e-c45r.md fr: https://steelequivalents.com/fr/matériaux/bs/c45-c45e-c45r.md hu: https://steelequivalents.com/hu/anyagok/bs/c45-c45e-c45r.md it: https://steelequivalents.com/it/materiali/bs/c45-c45e-c45r.md nl: https://steelequivalents.com/nl/materialen/bs/c45-c45e-c45r.md pl: https://steelequivalents.com/pl/materiały/bs/c45-c45e-c45r.md pt: https://steelequivalents.com/pt/materiais/bs/c45-c45e-c45r.md ru: https://steelequivalents.com/ru/материалы/bs/c45-c45e-c45r.md tr: https://steelequivalents.com/tr/malzemeler/bs/c45-c45e-c45r.md zh: https://steelequivalents.com/zh/材料/bs/c45-c45e-c45r.md ja: https://steelequivalents.com/ja/材料/bs/c45-c45e-c45r.md ar: https://steelequivalents.com/ar/المواد/bs/c45-c45e-c45r.md ko: https://steelequivalents.com/ko/재료/bs/c45-c45e-c45r.md pt-br: https://steelequivalents.com/pt-br/materiais/bs/c45-c45e-c45r.md hi: https://steelequivalents.com/hi/सामग्री/bs/c45-c45e-c45r.md content_hash: sha256:cabce53149df1f4e95f39fa81ca42a7241c4841e9f55885425063debdf48532a 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/bs/c45-c45e-c45r > Canonical URL: https://steelequivalents.com/materials/bs/c45-c45e-c45r > 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. BS · United Kingdom · 4 designations # C45 C45E C45R S45C is a grade designated under JIS. We list 3 designations recorded for this grade, in the standards BS, ISO and GB. No chemical composition is recorded for this material. - *Designations* **4** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=243841d5-1aef-4494-a01d-0deb600ee898&designation=0f59331c-aaa3-4e3d-93cc-0ba72874f68c "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/c45-c45e-c45r.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [JIS S45C This grade’s own name · 5 grades on that route](/materials/jis/s45c "JIS S45C") ## Also known as 4 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. BS United Kingdom · 1 - **C45 C45E C45R Indicative** ISO International · 1 - [C45 C45E4 C45M2 Indicative](/materials/iso/c45-c45e4-c45m2 "ISO C45 C45E4 C45M2") JIS Japan · 1 - [S45C This grade’s own name](/materials/jis/s45c "JIS S45C") GB China · 1 - [45 Indicative](/materials/gb/45 "GB 45") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Predicted transformation temperatures Not enough recorded composition to predict a transformation temperature for this grade — missing: C, Mn, Si, Ni, Cr, 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=243841d5-1aef-4494-a01d-0deb600ee898&designation=0f59331c-aaa3-4e3d-93cc-0ba72874f68c "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/c45-c45e-c45r.pdf "Datasheet as PDF")