--- title: "41CrMo4 — Steels for surface hardening" description: "41CrMo4: 30 equivalent designations across 14 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/41crmo4 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/41crmo4.md cs: https://steelequivalents.com/cs/materiály/din-en/41crmo4.md de: https://steelequivalents.com/de/werkstoffe/din-en/41crmo4.md es: https://steelequivalents.com/es/materiales/din-en/41crmo4.md fr: https://steelequivalents.com/fr/matériaux/din-en/41crmo4.md hu: https://steelequivalents.com/hu/anyagok/din-en/41crmo4.md it: https://steelequivalents.com/it/materiali/din-en/41crmo4.md nl: https://steelequivalents.com/nl/materialen/din-en/41crmo4.md pl: https://steelequivalents.com/pl/materiały/din-en/41crmo4.md pt: https://steelequivalents.com/pt/materiais/din-en/41crmo4.md ru: https://steelequivalents.com/ru/материалы/din-en/41crmo4.md tr: https://steelequivalents.com/tr/malzemeler/din-en/41crmo4.md zh: https://steelequivalents.com/zh/材料/din-en/41crmo4.md ja: https://steelequivalents.com/ja/材料/din-en/41crmo4.md ar: https://steelequivalents.com/ar/المواد/din-en/41crmo4.md ko: https://steelequivalents.com/ko/재료/din-en/41crmo4.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/41crmo4.md hi: https://steelequivalents.com/hi/सामग्री/din-en/41crmo4.md content_hash: sha256:005b614b2aab42cb7ab700a3635f5e937961611d105121c8465e59e086b661d3 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/41crmo4 > Canonical URL: https://steelequivalents.com/materials/din-en/41crmo4 > 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 · 30 designations # 41CrMo4 41CrMo4 is a material in the category [Steels for surface hardening](/categories/steels-for-surface-hardening "Steels for surface hardening"), held under material number 1.7223. We list 29 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, JIS, GB, GOST, UNI, SS, ČSN, BDS and NBN. Its recorded composition includes C 0.38–0.44%, Si 0.15–0.4%, Cr 0.9–1.2%, Mn 0.5–0.8% and Mo 0.15–0.3%. Recorded mechanical properties include Rm 615–880 N/mm², Re 395–735 N/mm², A5 10–15%, HB 241, Z 35–50% and KCU 490–880 kJ/m²; these figures vary with the delivery condition and dimension. Its recorded density is 7.72–7.81 g/cm³. Further recorded physical values: E 135–215 GPa, λ 28–37 W/(m·K), α 11.8–14.6 ·10⁻⁶/K and cp 466–664 J/(kg·K); several of these are temperature-dependent. Recorded transformation points: Ac1 760 °C, Ac3 800 °C, Ar1 680 °C and Ar3 725 °C. Its weldability is recorded as difficult. - [*Material no.* **1.7223**](/materials/material-no/1.7223 "Material no.: 1.7223") - [*Category* **Steels for surface hardening · 13 grades**](/categories/steels-for-surface-hardening "Category: Steels for surface hardening · 13 grades") - *Designations* **30** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=650b33f3-7922-406b-9b68-9ed78e861ba2&designation=7a326a24-f6e7-4d71-a0ee-9c1c6bcc433d "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/41crmo4.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [UNS G41420 This grade’s own name · 2 grades on that route](/materials/uns/g41420 "UNS G41420") - [AISI / SAE 4142 This grade’s own name · 4 grades on that route](/materials/aisi-sae/4142 "AISI / SAE 4142") ## 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 30 designations · 14 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 - [1.7223 Indicative](/materials/material-no/1.7223 "DIN / EN 1.7223") - **41CrMo4 This grade’s own name Withdrawn** UNS United States · 2 - [G41420 This grade’s own name](/materials/uns/g41420 "UNS G41420") - [K14047 This grade’s own name](/materials/uns/k14047 "UNS K14047") AISI / SAE United States · 5 - [4140 Indicative](/materials/aisi-sae/4140 "AISI / SAE 4140") - [4140 4142 Indicative](/materials/aisi-sae/4140-4142 "AISI / SAE 4140 4142") - [4142 This grade’s own name](/materials/aisi-sae/4142 "AISI / SAE 4142") - [6135 Indicative](/materials/aisi-sae/6135 "AISI / SAE 6135") - [G41400 Indicative](/materials/uns/g41400 "AISI / SAE G41400") BS United Kingdom · 5 - [19A Indicative](/materials/bs/19a "BS 19A") - [3111-5/1 Indicative](/materials/bs/3111-5-1 "BS 3111-5/1") - [42CrMO4 Indicative](/materials/din-en/42crmo4 "BS 42CrMO4") - [708M40 Indicative](/materials/bs/708m40 "BS 708M40") - [EN19A Indicative](/materials/bs/en19a "BS EN19A") AFNOR France · 1 - [42CD4TS Indicative](/materials/afnor/42cd4ts "AFNOR 42CD4TS") UNE Spain · 4 - [40CrMo4 Indicative](/materials/une/40crmo4 "UNE 40CrMo4") - [42CrMo4 Indicative](/materials/din-en/42crmo4 "UNE 42CrMo4") - [F.1252 Indicative](/materials/une/f1252 "UNE F.1252") - [F.8332 Indicative](/materials/une/f-8332 "UNE F.8332") JIS Japan · 1 - [SCM 440 Indicative](/materials/jis/scm440 "JIS SCM 440") GB China · 1 - [40CrMoA Indicative](/materials/gb/40crmoa "GB 40CrMoA") GOST Russia / CIS · 3 - [40ChFA Indicative](/materials/bds/40chfa "GOST 40ChFA") - [40KHFА Indicative](/materials/gost/40khfa "GOST 40KHFА") - [40ХФА Indicative](/materials/gost/40khfa "GOST 40ХФА") UNI Italy · 1 - **41CrMo4 Indicative** SS Sweden · 1 - [2244 Indicative](/materials/ss/2244 "SS 2244") ČSN Czechia · 2 - [15142 Indicative](/materials/csn/15142 "ČSN 15142") - [15240 Indicative](/materials/csn/15240 "ČSN 15240") BDS Bulgaria · 1 - [40ChFA Indicative](/materials/bds/40chfa "BDS 40ChFA") NBN Belgium · 1 - **41CrMo4 Indicative** Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 7 elements on file · weight % What this alloy is Fe Cr Mn C Iron — the balance, never listed by a standard — 97.3 % Cr — 1.1 % Mn — 0.7 % C — 0.4 % Traces & impurities · 0.6 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.38–0.44 | | Si | 0.15–0.4 | | Mn | 0.5–0.8 | | P | 0.025 | | S | 0.035 | | Cr | 0.9–1.2 | | Mo | 0.15–0.3 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum 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 | 0,38-0,44 | 0.380 | 0.440 | Range | | Si | 0,15-0,40 | 0.150 | 0.400 | Range | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,90-1,20 | 0.900 | 1.200 | Range | | Mn | 0,50-0,80 | 0.500 | 0.800 | Range | | Mo | 0,15-0,30 | 0.150 | 0.300 | 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. ## Physical & mechanical properties Density 7,72 g/cm³ Exact Transformation point Ac1 760 °C Exact Transformation point Ac3 800 °C Exact · Ac3(Acm) Transformation point Ar3 725 °C Exact · Ar3(Arcm) Transformation point Ar1 680 °C Exact Weldability difficult to weld As published: hard weldability. Flake sensitivity susceptible As published: predisposed Temper brittleness susceptible As published: predisposed 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 4 conditions · 51 values By dimension**Quenching and drawing** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | 100 - 300 | 615 | 395 | 15 | 40 | 540 | | 300 - 500 | 615 | 395 | 13 | 35 | 490 | By dimension**Quenching and drawing** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Ø 25 | 880 | 735 | 10 | 50 | 880 | By delivery state**no delivery state stated** source `splav` | Delivery state | HB | |---|---| | (annealing) , GOST 4543-71 | 241 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Elastic modulus GPa | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | Specific heat capacity J/(kg·K) | |---|---|---|---|---|---| | 20 | 7.81 | 215 | — | 37 | — | | 100 | — | 212 | 12.1 | 37 | 466 | | 200 | — | 205 | 12.6 | 37 | 508 | | 300 | — | 199 | 13 | 36 | 529 | | 400 | — | 182 | 13.3 | 33 | 563 | | 500 | — | 173 | 13.8 | 31 | 592 | | 600 | — | 166 | 14.2 | 31 | 621 | | 700 | — | 144 | 14.6 | 30 | 634 | | 800 | — | 135 | 11.8 | 28 | 664 | 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 1.7, a shared category, and a published range for Cr / Mn 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. [1.7045 1.7045 Cr 0,90-1,20 · Mn 0,50-0,80 - ΔCr 0.00 - ΔMn 0.00 - 14 designations](/materials/material-no/1.7045 "1.7045")[49CrMo4 1.7238 Cr 0,90-1,20 · Mn 0,50-0,80 - ΔCr 0.00 - ΔMn 0.00 - 1 designations](/materials/din-en/49crmo4 "49CrMo4")[38Cr4 1.7043 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.10 - 7 designations](/materials/din-en/38cr4 "38Cr4") ## 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=650b33f3-7922-406b-9b68-9ed78e861ba2&designation=7a326a24-f6e7-4d71-a0ee-9c1c6bcc433d "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/41crmo4.pdf "Datasheet as PDF")