--- title: "C50D — Steels for surface hardening" description: "C50D: 8 equivalent designations across 8 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/c50d language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/c50d.md cs: https://steelequivalents.com/cs/materiály/din-en/c50d.md de: https://steelequivalents.com/de/werkstoffe/din-en/c50d.md es: https://steelequivalents.com/es/materiales/din-en/c50d.md fr: https://steelequivalents.com/fr/matériaux/din-en/c50d.md hu: https://steelequivalents.com/hu/anyagok/din-en/c50d.md it: https://steelequivalents.com/it/materiali/din-en/c50d.md nl: https://steelequivalents.com/nl/materialen/din-en/c50d.md pl: https://steelequivalents.com/pl/materiały/din-en/c50d.md pt: https://steelequivalents.com/pt/materiais/din-en/c50d.md ru: https://steelequivalents.com/ru/материалы/din-en/c50d.md tr: https://steelequivalents.com/tr/malzemeler/din-en/c50d.md zh: https://steelequivalents.com/zh/材料/din-en/c50d.md ja: https://steelequivalents.com/ja/材料/din-en/c50d.md ar: https://steelequivalents.com/ar/المواد/din-en/c50d.md ko: https://steelequivalents.com/ko/재료/din-en/c50d.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/c50d.md hi: https://steelequivalents.com/hi/सामग्री/din-en/c50d.md content_hash: sha256:aaca026485daf409fc1bf761d6ec45f179f4fa4df7e9876d4a589b4926028545 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/c50d > Canonical URL: https://steelequivalents.com/materials/din-en/c50d > 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 · 8 designations # C50D C50D is a material in the category [Steels for surface hardening](/categories/steels-for-surface-hardening "Steels for surface hardening"), held under material number 1.0586. Its recorded composition includes C 0.48–0.53%, Si 0.1–0.3%, Mn 0.5–0.8%, Ni ≤ 0.2% and Cu ≤ 0.25%. We list 7 designations recorded for this grade, in the standards UNS, AISI / SAE, BS, ISO, JIS, GOST and UNI. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.0586**](/materials/material-no/1.0586 "Material no.: 1.0586") - [*Category* **Steels for surface hardening · 13 grades**](/categories/steels-for-surface-hardening "Category: Steels for surface hardening · 13 grades") - *Designations* **8** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=2e76d667-dfca-4cf1-a648-5dc8f9521660&designation=1a8dabf6-a16e-4eb7-810e-70d730613ad0 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/c50d.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [UNS G10500 This grade’s own name · 7 grades on that route](/materials/uns/g10500 "UNS G10500") - [AISI / SAE 1050 This grade’s own name · 9 grades on that route](/materials/aisi-sae/1050 "AISI / SAE 1050") ## 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 8 designations · 8 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 · 1 - **C50D This grade’s own name** UNS United States · 1 - [G10500 This grade’s own name](/materials/uns/g10500 "UNS G10500") AISI / SAE United States · 1 - [1050 This grade’s own name](/materials/aisi-sae/1050 "AISI / SAE 1050") BS United Kingdom · 1 - [C50 C50E C50R Indicative](/materials/bs/c50-c50e-c50r "BS C50 C50E C50R") ISO International · 1 - [C50 C50E4 C50M2 Indicative](/materials/iso/c50-c50e4-c50m2 "ISO C50 C50E4 C50M2") JIS Japan · 1 - [S50C Indicative](/materials/jis/s50c "JIS S50C") GOST Russia / CIS · 1 - [50 Indicative](/materials/bds/50 "GOST 50") UNI Italy · 1 - [C50E Indicative](/materials/din-en/c50e "UNI C50E") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 10 elements on file · weight % What this alloy is Fe Mn C Cu Iron — the balance, never listed by a standard — 97.9 % Mn — 0.7 % C — 0.5 % Cu — 0.3 % Traces & impurities · 0.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.48–0.53 | | Si | 0.1–0.3 | | Mn | 0.5–0.8 | | P | 0.03 | | S | 0.03 | | Cr | ≤ 0.15 | | Mo | ≤ 0.05 | | Ni | ≤ 0.2 | | Cu | ≤ 0.25 | | Al | ≤ 0.01 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Copper Aluminium 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 | 0,48-0,53 | 0.480 | 0.530 | Range | | Al | ≤0,010 | — | 0.010 | Max | | Si | 0,10-0,30 | 0.100 | 0.300 | Range | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Cr | ≤0,15 | — | 0.150 | Max | | Mn | 0,50-0,80 | 0.500 | 0.800 | Range | | Ni | ≤0,20 | — | 0.200 | Max | | Cu | ≤0,25 | — | 0.250 | Max | | Mo | ≤0,05 | — | 0.050 | 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 computed from composition · °C Predicted Ae3 758 °C Predicted Ae1 719 °C Predicted Acm 639 °C Predicted Bs 568 °C These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either. ## 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. ## 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=2e76d667-dfca-4cf1-a648-5dc8f9521660&designation=1a8dabf6-a16e-4eb7-810e-70d730613ad0 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/c50d.pdf "Datasheet as PDF")