--- title: "C50M2 — Steels for surface hardening" description: "C50M2 in ISO: material number 1.1241, also listed as C50R. Category: Steels for surface hardening. Designations recorded for this grade: 12." canonical: https://steelequivalents.com/materials/iso/c50m2 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/iso/c50m2.md cs: https://steelequivalents.com/cs/materiály/iso/c50m2.md de: https://steelequivalents.com/de/werkstoffe/iso/c50m2.md es: https://steelequivalents.com/es/materiales/iso/c50m2.md fr: https://steelequivalents.com/fr/matériaux/iso/c50m2.md hu: https://steelequivalents.com/hu/anyagok/iso/c50m2.md it: https://steelequivalents.com/it/materiali/iso/c50m2.md nl: https://steelequivalents.com/nl/materialen/iso/c50m2.md pl: https://steelequivalents.com/pl/materiały/iso/c50m2.md pt: https://steelequivalents.com/pt/materiais/iso/c50m2.md ru: https://steelequivalents.com/ru/материалы/iso/c50m2.md tr: https://steelequivalents.com/tr/malzemeler/iso/c50m2.md zh: https://steelequivalents.com/zh/材料/iso/c50m2.md ja: https://steelequivalents.com/ja/材料/iso/c50m2.md ar: https://steelequivalents.com/ar/المواد/iso/c50m2.md ko: https://steelequivalents.com/ko/재료/iso/c50m2.md pt-br: https://steelequivalents.com/pt-br/materiais/iso/c50m2.md hi: https://steelequivalents.com/hi/सामग्री/iso/c50m2.md content_hash: sha256:b63ae162b7b0824cb288dbbc53cedde29a1f0dab59481870bdaeb9971fe1ca19 generated: 2026-09-24 --- > **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/iso/c50m2 > Canonical URL: https://steelequivalents.com/materials/iso/c50m2 > 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. ISO · International · 12 designations # C50M2 C50M2 is a designation in ISO for the material held under material number 1.1241, also listed as C50R. It is a material in the category Steels for surface hardening. We list 12 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, ISO, JIS, GOST, UNI and ČSN. - [*Material no.* **1.1241**](/materials/material-no/1.1241 "Material no.: 1.1241") - [*Category* **Steels for surface hardening · 13 grades**](/categories/steels-for-surface-hardening "Category: Steels for surface hardening · 13 grades") - *Designations* **12** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=8bb1fe78-765e-421c-b19c-31efcc779490&designation=03949b0e-bdf2-4098-887e-96f458d553ca "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/iso/c50m2.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN C50R This grade’s own name](/materials/din-en/c50r "DIN / EN C50R") - [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 12 designations · 9 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 - [C50R This grade’s own name](/materials/din-en/c50r "DIN / EN C50R") - [Cm 50 This grade’s own name Withdrawn](/materials/din-en/cm-50 "DIN / EN Cm 50") 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 · 2 - [C50 C50E4 C50M2 Indicative](/materials/iso/c50-c50e4-c50m2 "ISO C50 C50E4 C50M2") - **C50M2 Indicative** JIS Japan · 1 - [S50C Indicative](/materials/jis/s50c "JIS S50C") GOST Russia / CIS · 1 - [50 Indicative](/materials/bds/50 "GOST 50") UNI Italy · 2 - [C50 Indicative](/materials/din-en/c50 "UNI C50") - [C50E Indicative](/materials/din-en/c50e "UNI C50E") ČSN Czechia · 1 - [12051 Indicative](/materials/csn/12051 "ČSN 12051") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 8 elements on file · weight % What this alloy is Fe Mn C Si Iron — the balance, never listed by a standard — 97.4 % Mn — 0.8 % C — 0.5 % Si — 0.4 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.47–0.55 | | Si | ≤ 0.4 | | Mn | 0.6–0.9 | | P | 0.03 | | S | 0.02–0.04 | | Cr | ≤ 0.4 | | Mo | ≤ 0.1 | | Ni | ≤ 0.4 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum 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 | 0,47-0,55 | 0.470 | 0.550 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,020-0,040 | 0.020 | 0.040 | Range | | Cr | ≤0,40 | — | 0.400 | Max | | Mn | 0,60-0,90 | 0.600 | 0.900 | Range | | Ni | ≤0,40 | — | 0.400 | Max | | Mo | ≤0,10 | — | 0.100 | 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 753 °C Predicted Ae1 723 °C Predicted Acm 663 °C Predicted Bs 550 °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. ## Properties by condition 5 conditions · 17 values By thickness**Cold drawn / hard** source `steelnumber` | Thickness mm | Rm N/mm² | A% | |---|---|---| | 5 – 10 | 770 – 1100 | 5 | | 10 – 16 | 730 – 1080 | 6 | | 16 – 40 | 690 – 1050 | 7 | | 40 – 63 | 650 – 1030 | 8 | By thickness**Normalized** source `steelnumber` | Thickness mm | Rm N/mm² | A% | |---|---|---| | ≤ 16 | 650 | 13 | | 16 – 100 | 610 | 14 | | 100 – 250 | 590 | 14 | By delivery state**Treated to improve shearability** source `steelnumber` | Delivery state | HB | |---|---| | Treated to improve shearability | 255 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 217 | By delivery state**As rolled and turned** source `steelnumber` | Delivery state | HB | |---|---| | As rolled and turned | 181 – 269 | Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ. ## 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. [C53E 1.1210 Mn 0,60-0,90 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 12 designations](/materials/din-en/c53e "C53E")[1.1183 1.1183 Mn 0,50-0,80 · Si 0,15-0,35 - ΔMn 0.10 - ΔSi 0.05 - 10 designations](/materials/material-no/1.1183 "1.1183")[C45G 1.1193 Mn 0,50-0,80 · Si 0,15-0,35 - ΔMn 0.10 - ΔSi 0.05 - 5 designations](/materials/din-en/c45g "C45G")[1.1213 1.1213 Mn 0,40-0,70 · Si 0,15-0,35 - ΔMn 0.20 - ΔSi 0.05 - 20 designations](/materials/material-no/1.1213 "1.1213") ## 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=8bb1fe78-765e-421c-b19c-31efcc779490&designation=03949b0e-bdf2-4098-887e-96f458d553ca "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/iso/c50m2.pdf "Datasheet as PDF")