--- title: "19065 — Unalloyed tool steels / carbon steels" description: "19065 in ČSN: material number 1.1730, also listed as C45U. Category: Unalloyed tool steels / carbon steels. Designations recorded for this grade: 19." canonical: https://steelequivalents.com/materials/csn/19065 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/csn/19065.md cs: https://steelequivalents.com/cs/materiály/csn/19065.md de: https://steelequivalents.com/de/werkstoffe/csn/19065.md es: https://steelequivalents.com/es/materiales/csn/19065.md fr: https://steelequivalents.com/fr/matériaux/csn/19065.md hu: https://steelequivalents.com/hu/anyagok/csn/19065.md it: https://steelequivalents.com/it/materiali/csn/19065.md nl: https://steelequivalents.com/nl/materialen/csn/19065.md pl: https://steelequivalents.com/pl/materiały/csn/19065.md pt: https://steelequivalents.com/pt/materiais/csn/19065.md ru: https://steelequivalents.com/ru/материалы/csn/19065.md tr: https://steelequivalents.com/tr/malzemeler/csn/19065.md zh: https://steelequivalents.com/zh/材料/csn/19065.md ja: https://steelequivalents.com/ja/材料/csn/19065.md ar: https://steelequivalents.com/ar/المواد/csn/19065.md ko: https://steelequivalents.com/ko/재료/csn/19065.md pt-br: https://steelequivalents.com/pt-br/materiais/csn/19065.md hi: https://steelequivalents.com/hi/सामग्री/csn/19065.md content_hash: sha256:bb39da348cea7012e2629ee983d6023fe73237be0ca76c589fcdaf823f066cd7 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/csn/19065 > Canonical URL: https://steelequivalents.com/materials/csn/19065 > 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. ČSN · Czechia · 19 designations # 19065 19065 is a designation in ČSN for the material held under material number 1.1730, also listed as C45U. It is a material in the category Unalloyed tool steels / carbon steels. We list 19 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, JIS, GB, GOST, UNI, SS, ČSN, STN and PN. - [*Material no.* **1.1730**](/materials/material-no/1.1730 "Material no.: 1.1730") - [*Category* **Unalloyed tool steels / carbon steels · 35 grades**](/categories/unalloyed-tool-steels-carbon-steels "Category: Unalloyed tool steels / carbon steels · 35 grades") - *Designations* **19** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=c2c0f7a8-83fb-4444-966d-d1a583cd88df&designation=1442b859-7938-4a0e-bcd5-c3091deef628 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/csn/19065.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN C45U This grade’s own name](/materials/din-en/c45u "DIN / EN C45U") - [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 Unalloyed tool steels / carbon steels Unalloyed tool steels are carbon steels whose working properties are developed primarily through carbon content and heat treatment. They are characterised by high attainable hardness and wear resistance, and are used for cutting tools, punches, dies, gauges and other tooling where edge retention and resistance to deformation are important. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 19 designations · 15 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 - [C45U This grade’s own name](/materials/din-en/c45u "DIN / EN C45U") - [C45W This grade’s own name Withdrawn](/materials/din-en/c45w "DIN / EN C45W") UNS United States · 1 - [G10450 This grade’s own name](/materials/uns/g10450 "UNS G10450") AISI / SAE United States · 2 - [1045 This grade’s own name](/materials/aisi-sae/1045 "AISI / SAE 1045") - [W1045 przybliż Indicative](/materials/aisi-sae/w1045-przybliz "AISI / SAE W1045 przybliż") ASTM United States · 1 - [A830 Indicative](/materials/astm/a830 "ASTM A830") BS United Kingdom · 1 - [080M46 Indicative](/materials/bs/080m46 "BS 080M46") AFNOR France · 1 - [XC48 / C45E Indicative](/materials/afnor/xc48-c45e "AFNOR XC48 / C45E") UNE Spain · 1 - [F.114 Indicative](/materials/une/f-114 "UNE F.114") JIS Japan · 1 - [S45C przybliż. Indicative](/materials/jis/s45c-przybliz "JIS S45C przybliż.") GB China · 1 - [45 Indicative](/materials/gb/45 "GB 45") GOST Russia / CIS · 1 - [45 Indicative](/materials/gb/45 "GOST 45") UNI Italy · 1 - [C45 Indicative](/materials/din-en/c45 "UNI C45") SS Sweden · 1 - [1672 Indicative](/materials/ss/1672 "SS 1672") ČSN Czechia · 2 - **19065 Indicative** - [19083 Indicative](/materials/csn/19083 "ČSN 19083") STN Slovakia · 1 - [19 083 Indicative](/materials/csn/19083 "STN 19 083") PN Poland · 2 - [N7E Indicative](/materials/pn/n7e "PN N7E") - [stal narzędziowa węglowa Indicative](/materials/pn/stal-narzedziowa-weglowa "PN stal narzędziowa węglowa") 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 — 98.5 % 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 | 0.42–0.5 | | Si | 0.15–0.4 | | Mn | 0.6–0.8 | | P | 0.03 | | S | 0.03 | 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 | 0,42-0,50 | 0.420 | 0.500 | Range | | Si | 0,15-0,40 | 0.150 | 0.400 | Range | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Mn | 0,60-0,80 | 0.600 | 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. ## Properties by condition 1 conditions · 1 values By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 207 | 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. [C60U 1.1740 Mn 0,60-0,80 · Si 0,15-0,40 - ΔMn 0.00 - ΔSi 0.00 - 3 designations](/materials/din-en/c60u "C60U")[C67W 1.1744 Mn 0,60-0,80 · Si 0,15-0,40 - ΔMn 0.00 - ΔSi 0.00 - 3 designations](/materials/din-en/c67w "C67W")[C75W 1.1750 Mn 0,60-0,80 · Si 0,15-0,40 - ΔMn 0.00 - ΔSi 0.00 - 1 designations](/materials/din-en/c75w "C75W")[C85U 1.1830 Mn 0,50-0,70 · Si 0,25-0,40 - ΔMn 0.10 - ΔSi 0.05 - 16 designations](/materials/din-en/c85u "C85U") ## 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=c2c0f7a8-83fb-4444-966d-d1a583cd88df&designation=1442b859-7938-4a0e-bcd5-c3091deef628 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/csn/19065.pdf "Datasheet as PDF")