--- title: "XC3841 — Quenched and tempered steels" description: "XC3841 in AFNOR: material number 1.0511, also listed as C40. Category: Quenched and tempered steels. Designations recorded for this grade: 63." canonical: https://steelequivalents.com/materials/afnor/xc3841 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/afnor/xc3841.md cs: https://steelequivalents.com/cs/materiály/afnor/xc3841.md de: https://steelequivalents.com/de/werkstoffe/afnor/xc3841.md es: https://steelequivalents.com/es/materiales/afnor/xc3841.md fr: https://steelequivalents.com/fr/matériaux/afnor/xc3841.md hu: https://steelequivalents.com/hu/anyagok/afnor/xc3841.md it: https://steelequivalents.com/it/materiali/afnor/xc3841.md nl: https://steelequivalents.com/nl/materialen/afnor/xc3841.md pl: https://steelequivalents.com/pl/materiały/afnor/xc3841.md pt: https://steelequivalents.com/pt/materiais/afnor/xc3841.md ru: https://steelequivalents.com/ru/материалы/afnor/xc3841.md tr: https://steelequivalents.com/tr/malzemeler/afnor/xc3841.md zh: https://steelequivalents.com/zh/材料/afnor/xc3841.md ja: https://steelequivalents.com/ja/材料/afnor/xc3841.md ar: https://steelequivalents.com/ar/المواد/afnor/xc3841.md ko: https://steelequivalents.com/ko/재료/afnor/xc3841.md pt-br: https://steelequivalents.com/pt-br/materiais/afnor/xc3841.md hi: https://steelequivalents.com/hi/सामग्री/afnor/xc3841.md content_hash: sha256:c8fba16e336a21aa5e27eddc85d9ad9471228dfa4c3fc5192ea3a93cc290ed4d 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/afnor/xc3841 > Canonical URL: https://steelequivalents.com/materials/afnor/xc3841 > 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. AFNOR · France · 63 designations # XC3841 XC3841 is a designation in AFNOR for the material held under material number 1.0511, also listed as C40. It is a material in the category Quenched and tempered steels. We list 63 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, SS, ČSN, STN, PN, SRPS, MSZ, AS / NZS, STAS, BDS, NBN and KS. - [*Material no.* **1.0511**](/materials/material-no/1.0511 "Material no.: 1.0511") - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **63** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=b870781e-7223-4a2e-bc0f-974476069439&designation=4a4e98b4-1b9b-452a-b05e-426a85b5317f "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/afnor/xc3841.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN C40 This grade’s own name](/materials/din-en/c40 "DIN / EN C40") - [UNS G10400 This grade’s own name · 5 grades on that route](/materials/uns/g10400 "UNS G10400") - [AISI / SAE 1040 This grade’s own name · 6 grades on that route](/materials/aisi-sae/1040 "AISI / SAE 1040") ## About Quenched and tempered steels Quenched and tempered steels are heat-treated steels designed to combine high strength with useful toughness and ductility. They are used for heavily loaded components such as shafts, gears, fasteners and structural machine parts where resistance to mechanical stress is required. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 63 designations · 22 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 · 3 - [1.0511 Indicative](/materials/material-no/1.0511 "DIN / EN 1.0511") - [C40 This grade’s own name](/materials/din-en/c40 "DIN / EN C40") - [Ck40 Indicative](/materials/din-en/ck40 "DIN / EN Ck40") UNS United States · 1 - [G10400 This grade’s own name](/materials/uns/g10400 "UNS G10400") AISI / SAE United States · 5 - [1038 Indicative](/materials/aisi-sae/1038 "AISI / SAE 1038") - [1040 This grade’s own name](/materials/aisi-sae/1040 "AISI / SAE 1040") - [1042 Indicative](/materials/aisi-sae/1042 "AISI / SAE 1042") - [G10400 Indicative](/materials/uns/g10400 "AISI / SAE G10400") - [G10420 Indicative](/materials/uns/g10420 "AISI / SAE G10420") BS United Kingdom · 8 - [060A40 Indicative](/materials/bs/060a40 "BS 060A40") - [070M40 Indicative](/materials/bs/070m40 "BS 070M40") - [080A40 Indicative](/materials/bs/080a40 "BS 080A40") - [080M40 Indicative](/materials/bs/080m40 "BS 080M40") - [C40 Indicative](/materials/din-en/c40 "BS C40") - [C40E Indicative](/materials/din-en/c40e "BS C40E") - [CS40 Indicative](/materials/bs/cs40 "BS CS40") - [En8 Indicative](/materials/bs/en8 "BS En8") AFNOR France · 12 - [2C40 Indicative](/materials/afnor/2c40 "AFNOR 2C40") - [AF60C40 Indicative](/materials/afnor/af60c40 "AFNOR AF60C40") - [AF60C45 Indicative](/materials/afnor/af60c45 "AFNOR AF60C45") - [C40E Indicative](/materials/din-en/c40e "AFNOR C40E") - [CC40 Indicative](/materials/afnor/cc40 "AFNOR CC40") - [FR38 Indicative](/materials/afnor/fr38 "AFNOR FR38") - [XC 42 Indicative](/materials/afnor/xc42 "AFNOR XC 42") - **XC3841 Indicative** - [XC38H1 Indicative](/materials/afnor/xc38h1 "AFNOR XC38H1") - [XC42H1 Indicative](/materials/afnor/xc42h1 "AFNOR XC42H1") - [XC42HI Indicative](/materials/afnor/xc42hi "AFNOR XC42HI") - [XP42HI Indicative](/materials/afnor/xp42hi "AFNOR XP42HI") UNE Spain · 2 - [C40E Indicative](/materials/din-en/c40e "UNE C40E") - [F.114.A Indicative](/materials/une/f-114-a "UNE F.114.A") ISO International · 2 - [C40 Indicative](/materials/din-en/c40 "ISO C40") - [C40E4 Indicative](/materials/iso/c40e4 "ISO C40E4") JIS Japan · 4 - [S 40C Indicative](/materials/jis/s40c "JIS S 40C") - [S43C Indicative](/materials/jis/s43c "JIS S43C") - [SWRCH38K Indicative](/materials/jis/swrch38k "JIS SWRCH38K") - [SWRCH40K Indicative](/materials/jis/swrch40k "JIS SWRCH40K") GB China · 2 - [40 Indicative](/materials/gb/40 "GB 40") - [ML40 Indicative](/materials/gb/ml40 "GB ML40") GOST Russia / CIS · 2 - [40 Indicative](/materials/gb/40 "GOST 40") - [ст.40 Indicative](/materials/gost/st-40 "GOST ст.40") UNI Italy · 3 - [C40 Indicative](/materials/din-en/c40 "UNI C40") - [C40E Indicative](/materials/din-en/c40e "UNI C40E") - [C40R Indicative](/materials/din-en/c40r "UNI C40R") SS Sweden · 2 - [1555 Indicative](/materials/ss/1555 "SS 1555") - [1650 Indicative](/materials/ss/1650 "SS 1650") ČSN Czechia · 1 - [12041 Indicative](/materials/csn/12041 "ČSN 12041") STN Slovakia · 1 - [12 041 Indicative](/materials/csn/12041 "STN 12 041") PN Poland · 5 - [40 Indicative](/materials/gb/40 "PN 40") - [40A Indicative](/materials/pn/40a "PN 40A") - [40rs Indicative](/materials/pn/40rs "PN 40rs") - [D40 Indicative](/materials/gost/d40 "PN D40") - [P40 Indicative](/materials/pn/p40 "PN P40") SRPS Serbia · 1 - [Č.1540 Indicative](/materials/srps/c-1540 "SRPS Č.1540") MSZ Hungary · 1 - [C40E Indicative](/materials/din-en/c40e "MSZ C40E") AS / NZS Australia / New Zealand · 2 - [1040 Indicative](/materials/aisi-sae/1040 "AS / NZS 1040") - [M1040 Indicative](/materials/as-nzs/m1040 "AS / NZS M1040") STAS Romania · 2 - [OLC40 Indicative](/materials/stas/olc40 "STAS OLC40") - [OLC40X Indicative](/materials/stas/olc40x "STAS OLC40X") BDS Bulgaria · 2 - [40 Indicative](/materials/gb/40 "BDS 40") - [C40E Indicative](/materials/din-en/c40e "BDS C40E") NBN Belgium · 1 - [C40-2 Indicative](/materials/nbn/c40-2 "NBN C40-2") KS South Korea · 1 - [SM40C Indicative](/materials/ks/sm40c "KS SM40C") 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 — 97.6 % Mn — 0.7 % C — 0.4 % Si — 0.4 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.37–0.44 | | Si | ≤ 0.4 | | Mn | 0.5–0.8 | | P | 0.045 | | S | 0.045 | | 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 | 0,37-0,44 | 0.370 | 0.440 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,045 | 0.045 | 0.045 | Exact | | Cr | ≤0,40 | — | 0.400 | Max | | Mn | 0,50-0,80 | 0.500 | 0.800 | 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 774 °C Predicted Ae1 724 °C Predicted Acm 603 °C Predicted Bs 560 °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 3 conditions · 17 values By thickness**Cold drawn / hard** source `steelnumber` | Thickness mm | Rm N/mm² | A% | |---|---|---| | 5 – 10 | 700 – 1000 | 6 | | 10 – 16 | 650 – 980 | 7 | | 16 – 40 | 620 – 920 | 8 | | 40 – 63 | 590 – 840 | 9 | | 63 – 100 | 550 – 820 | 9 | By thickness**Normalized** source `steelnumber` | Thickness mm | Rm N/mm² | A% | |---|---|---| | ≤ 16 | 580 | 16 | | 16 – 100 | 550 | 17 | | 100 – 250 | 530 | 17 | By delivery state**As rolled and turned** source `steelnumber` | Delivery state | HB | |---|---| | As rolled and turned | 163 – 211 | 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 1.0, 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. [C26D 1.0415 Mn 0,50-0,80 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 8 designations](/materials/din-en/c26d "C26D")[1.0501 1.0501 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 123 designations](/materials/material-no/1.0501 "1.0501")[C35GPb 1.0502 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 2 designations](/materials/din-en/c35gpb "C35GPb")[1.0503 1.0503 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 93 designations](/materials/material-no/1.0503 "1.0503")[1.0528 1.0528 Mn 0,50-0,80 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.00 - 54 designations](/materials/material-no/1.0528 "1.0528")[C42D 1.0541 Mn 0,50-0,80 · Si 0,10-0,30 - ΔMn 0.00 - ΔSi 0.00 - 5 designations](/materials/din-en/c42d "C42D") ## 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=b870781e-7223-4a2e-bc0f-974476069439&designation=4a4e98b4-1b9b-452a-b05e-426a85b5317f "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/afnor/xc3841.pdf "Datasheet as PDF")