--- title: "42Cr4 — Steels for surface hardening" description: "42Cr4: 14 equivalent designations across 10 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/42cr4 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/42cr4.md cs: https://steelequivalents.com/cs/materiály/din-en/42cr4.md de: https://steelequivalents.com/de/werkstoffe/din-en/42cr4.md es: https://steelequivalents.com/es/materiales/din-en/42cr4.md fr: https://steelequivalents.com/fr/matériaux/din-en/42cr4.md hu: https://steelequivalents.com/hu/anyagok/din-en/42cr4.md it: https://steelequivalents.com/it/materiali/din-en/42cr4.md nl: https://steelequivalents.com/nl/materialen/din-en/42cr4.md pl: https://steelequivalents.com/pl/materiały/din-en/42cr4.md pt: https://steelequivalents.com/pt/materiais/din-en/42cr4.md ru: https://steelequivalents.com/ru/материалы/din-en/42cr4.md tr: https://steelequivalents.com/tr/malzemeler/din-en/42cr4.md zh: https://steelequivalents.com/zh/材料/din-en/42cr4.md ja: https://steelequivalents.com/ja/材料/din-en/42cr4.md ar: https://steelequivalents.com/ar/المواد/din-en/42cr4.md ko: https://steelequivalents.com/ko/재료/din-en/42cr4.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/42cr4.md hi: https://steelequivalents.com/hi/सामग्री/din-en/42cr4.md content_hash: sha256:9fd3064a0ddeea582757bc9e9f62ff8b29e0e7fcaed8be45b6594e2440c73fd1 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/42cr4 > Canonical URL: https://steelequivalents.com/materials/din-en/42cr4 > 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 · 14 designations # 42Cr4 42Cr4 is a material in the category [Steels for surface hardening](/categories/steels-for-surface-hardening "Steels for surface hardening"), held under material number 1.7045. We list 13 designations recorded for this grade, in the standards DIN / EN, AISI / SAE, BS, AFNOR, UNE, JIS, GB, GOST, SS and ČSN. Its recorded composition includes C 0.38–0.44%, Si 0.15–0.4%, S 0.035%, Cr 0.9–1.2% and Mn 0.5–0.8%. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.7045**](/materials/material-no/1.7045 "Material no.: 1.7045") - [*Category* **Steels for surface hardening · 13 grades**](/categories/steels-for-surface-hardening "Category: Steels for surface hardening · 13 grades") - *Designations* **14** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=0a00a211-04b5-4ec7-95ae-b9ea48a31081&designation=1c4a7847-e198-4029-be8a-1c906107033b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/42cr4.pdf "Datasheet as PDF") ## 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 14 designations · 10 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 - [1.7045 Indicative](/materials/material-no/1.7045 "DIN / EN 1.7045") - **42Cr4 This grade’s own name Withdrawn** AISI / SAE United States · 1 - [5140 Indicative](/materials/aisi-sae/5140 "AISI / SAE 5140") BS United Kingdom · 1 - [530A40 Indicative](/materials/bs/530a40 "BS 530A40") AFNOR France · 1 - [42C4TS Indicative](/materials/afnor/42c4ts "AFNOR 42C4TS") UNE Spain · 3 - **42Cr4 Indicative** - [F.1202 Indicative](/materials/une/f1202 "UNE F.1202") - [F.1202-42Cr4 Indicative](/materials/une/f-1202-42cr4 "UNE F.1202-42Cr4") JIS Japan · 1 - [SCr440 Indicative](/materials/ks/scr440 "JIS SCr440") GB China · 1 - [40Cr Indicative](/materials/gb/40cr "GB 40Cr") GOST Russia / CIS · 1 - [40Ch Indicative](/materials/gost/40ch "GOST 40Ch") SS Sweden · 1 - [2245 Indicative](/materials/ss/2245 "SS 2245") ČSN Czechia · 2 - [14140 Indicative](/materials/csn/14140 "ČSN 14140") - [14148VN Indicative](/materials/csn/14148vn "ČSN 14148VN") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 6 elements on file · weight % What this alloy is Fe Cr Mn C Iron — the balance, never listed by a standard — 97.6 % Cr — 1.1 % Mn — 0.7 % C — 0.4 % Traces & impurities · 0.3 % 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 | Carbon Silicon Manganese Phosphorus Sulfur Chromium 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 | 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, 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. ## 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. [1.7223 1.7223 Cr 0,90-1,20 · Mn 0,50-0,80 - ΔCr 0.00 - ΔMn 0.00 - 30 designations](/materials/material-no/1.7223 "1.7223")[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=0a00a211-04b5-4ec7-95ae-b9ea48a31081&designation=1c4a7847-e198-4029-be8a-1c906107033b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/42cr4.pdf "Datasheet as PDF")