--- title: "20CrS4 — Case hardening steels" description: "20CrS4: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/20crs4 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/20crs4.md cs: https://steelequivalents.com/cs/materiály/din-en/20crs4.md de: https://steelequivalents.com/de/werkstoffe/din-en/20crs4.md es: https://steelequivalents.com/es/materiales/din-en/20crs4.md fr: https://steelequivalents.com/fr/matériaux/din-en/20crs4.md hu: https://steelequivalents.com/hu/anyagok/din-en/20crs4.md it: https://steelequivalents.com/it/materiali/din-en/20crs4.md nl: https://steelequivalents.com/nl/materialen/din-en/20crs4.md pl: https://steelequivalents.com/pl/materiały/din-en/20crs4.md pt: https://steelequivalents.com/pt/materiais/din-en/20crs4.md ru: https://steelequivalents.com/ru/материалы/din-en/20crs4.md tr: https://steelequivalents.com/tr/malzemeler/din-en/20crs4.md zh: https://steelequivalents.com/zh/材料/din-en/20crs4.md ja: https://steelequivalents.com/ja/材料/din-en/20crs4.md ar: https://steelequivalents.com/ar/المواد/din-en/20crs4.md ko: https://steelequivalents.com/ko/재료/din-en/20crs4.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/20crs4.md hi: https://steelequivalents.com/hi/सामग्री/din-en/20crs4.md content_hash: sha256:25dfd7c129521b3f4068e9781f5281685c099ac4231f0685215403f7faa9cee5 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/20crs4 > Canonical URL: https://steelequivalents.com/materials/din-en/20crs4 > 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 · 1 designation # 20CrS4 20CrS4 is a material in the category [Case hardening steels](/categories/case-hardening-steels "Case hardening steels"), held under material number 1.7028. Its recorded composition includes C 0.17–0.23%, Si ≤ 0.4%, P 0.035%, Cr 0.9–1.2% and Mn 0.6–0.9%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include HB 197. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.7028**](/materials/material-no/1.7028 "Material no.: 1.7028") - [*Category* **Case hardening steels · 60 grades**](/categories/case-hardening-steels "Category: Case hardening steels · 60 grades") - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=90435d05-5cb3-4d09-a958-b313d5355828&designation=db96b722-b905-4b69-98aa-1ef3a9876c09 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/20crs4.pdf "Datasheet as PDF") ## About Case hardening steels Case hardening steels are steels designed to develop a hard, wear-resistant surface while retaining a tough and ductile core. They are used for components such as gears, shafts and other machine parts exposed to contact wear and cyclic loading. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Chemical composition 6 elements on file · weight % What this alloy is Fe Cr Mn Si Iron — the balance, never listed by a standard — 97.5 % Cr — 1.1 % Mn — 0.8 % Si — 0.4 % Traces & impurities · 0.3 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.17–0.23 | | Si | ≤ 0.4 | | Mn | 0.6–0.9 | | P | 0.035 | | S | 0.02–0.035 | | 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 | 0,17-0,23 | 0.170 | 0.230 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,020-0,035 | 0.020 | 0.035 | Range | | Cr | 0,90-1,20 | 0.900 | 1.200 | Range | | Mn | 0,60-0,90 | 0.600 | 0.900 | 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. ## Properties by condition 0 conditions · 0 values 3 further values are held for this grade under a condition the source did not name — a bound with no quantity attached. They are withheld rather than shown against a guessed condition. ## 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. [20Cr4 1.7027 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 25 designations](/materials/din-en/20cr4 "20Cr4")[28CrS4 1.7036 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 7 designations](/materials/din-en/28crs4 "28CrS4")[18CrMo4 1.7243 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 23 designations](/materials/din-en/18crmo4 "18CrMo4")[18CrMoS4 1.7244 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 3 designations](/materials/din-en/18crmos4 "18CrMoS4")[17CrS3 1.7014 Cr 0,70-1,00 · Mn 0,60-0,90 - ΔCr 0.20 - ΔMn 0.00 - 2 designations](/materials/din-en/17crs3 "17CrS3")[17Cr3 1.7016 Cr 0,70-1,00 · Mn 0,60-0,90 - ΔCr 0.20 - ΔMn 0.00 - 36 designations](/materials/din-en/17cr3 "17Cr3") ## 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=90435d05-5cb3-4d09-a958-b313d5355828&designation=db96b722-b905-4b69-98aa-1ef3a9876c09 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/20crs4.pdf "Datasheet as PDF")