--- title: "37CrS4 — Quenched and tempered steels" description: "37CrS4: 10 equivalent designations across 8 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/37crs4 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/37crs4.md cs: https://steelequivalents.com/cs/materiály/din-en/37crs4.md de: https://steelequivalents.com/de/werkstoffe/din-en/37crs4.md es: https://steelequivalents.com/es/materiales/din-en/37crs4.md fr: https://steelequivalents.com/fr/matériaux/din-en/37crs4.md hu: https://steelequivalents.com/hu/anyagok/din-en/37crs4.md it: https://steelequivalents.com/it/materiali/din-en/37crs4.md nl: https://steelequivalents.com/nl/materialen/din-en/37crs4.md pl: https://steelequivalents.com/pl/materiały/din-en/37crs4.md pt: https://steelequivalents.com/pt/materiais/din-en/37crs4.md ru: https://steelequivalents.com/ru/материалы/din-en/37crs4.md tr: https://steelequivalents.com/tr/malzemeler/din-en/37crs4.md zh: https://steelequivalents.com/zh/材料/din-en/37crs4.md ja: https://steelequivalents.com/ja/材料/din-en/37crs4.md ar: https://steelequivalents.com/ar/المواد/din-en/37crs4.md ko: https://steelequivalents.com/ko/재료/din-en/37crs4.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/37crs4.md hi: https://steelequivalents.com/hi/सामग्री/din-en/37crs4.md content_hash: sha256:9c4f726c6ed43e5e952d603d284e4562faa92756e29b69c9bf9814961a8ce763 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/37crs4 > Canonical URL: https://steelequivalents.com/materials/din-en/37crs4 > 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 · 10 designations # 37CrS4 37CrS4 is a material in the category [Quenched and tempered steels](/categories/quenched-and-tempered-steels "Quenched and tempered steels"), held under material number 1.7038. We list 9 designations recorded for this grade, in the standards UNS, AISI / SAE, AFNOR, UNE, ISO, ČSN and SRPS. Its recorded composition includes C 0.34–0.41%, Si ≤ 0.4%, S 0.02–0.04%, Cr 0.9–1.2% and Mn 0.6–0.9%. Recorded mechanical properties include A 11–14% and HB 235–255; these figures vary with the delivery condition and dimension. Its recorded density is 7.85 g/cm³. - [*Material no.* **1.7038**](/materials/material-no/1.7038 "Material no.: 1.7038") - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **10** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=3690fbc9-1ce2-4bd0-b3ba-a66f53df483b&designation=b5ff8037-8fd6-48b1-8190-08d90b44f609 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/37crs4.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [UNS G51350 This grade’s own name · 2 grades on that route](/materials/uns/g51350 "UNS G51350") - [AISI / SAE 5135 This grade’s own name · 3 grades on that route](/materials/aisi-sae/5135 "AISI / SAE 5135") ## 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 10 designations · 8 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 · 1 - **37CrS4 This grade’s own name** UNS United States · 2 - [G51350 This grade’s own name](/materials/uns/g51350 "UNS G51350") - [H51350 This grade’s own name](/materials/uns/h51350 "UNS H51350") AISI / SAE United States · 2 - [5135 This grade’s own name](/materials/aisi-sae/5135 "AISI / SAE 5135") - [5135H This grade’s own name](/materials/aisi-sae/5135h "AISI / SAE 5135H") AFNOR France · 1 - [38C4u Indicative](/materials/afnor/38c4u "AFNOR 38C4u") UNE Spain · 1 - [38Cr41 Indicative](/materials/une/38cr41 "UNE 38Cr41") ISO International · 1 - **37CrS4 Indicative** ČSN Czechia · 1 - [14146ŽH Indicative](/materials/csn/14146zh "ČSN 14146ŽH") SRPS Serbia · 1 - [Č.4184 Indicative](/materials/srps/c-4184 "SRPS Č.4184") 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 Si Iron — the balance, never listed by a standard — 97.4 % Cr — 1.1 % Mn — 0.8 % Si — 0.4 % Traces & impurities · 0.4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.34–0.41 | | Si | ≤ 0.4 | | Mn | 0.6–0.9 | | P | 0.025 | | S | 0.02–0.04 | | 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 | 0,34-0,41 | 0.340 | 0.410 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,020-0,040 | 0.020 | 0.040 | 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 3 conditions · 5 values By thickness**Quenched and tempered · round products** source `steelnumber` | Thickness mm | A% · Lo = 5,65 √So | |---|---| | ≤ 16 | 11 | | 16 – 40 | 13 | | 40 – 100 | 14 | By delivery state**Treated to improve shearability** source `steelnumber` | Delivery state | HB | |---|---| | Treated to improve shearability | 255 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 235 | 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. [28Cr4 1.7030 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 28 designations](/materials/din-en/28cr4 "28Cr4")[1.7033 1.7033 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 56 designations](/materials/material-no/1.7033 "1.7033")[37Cr4 1.7034 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 104 designations](/materials/din-en/37cr4 "37Cr4")[1.7035 1.7035 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 67 designations](/materials/material-no/1.7035 "1.7035")[34CrS4 1.7037 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 13 designations](/materials/din-en/34crs4 "34CrS4")[41CrS4 1.7039 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 20 designations](/materials/din-en/41crs4 "41CrS4") ## 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=3690fbc9-1ce2-4bd0-b3ba-a66f53df483b&designation=b5ff8037-8fd6-48b1-8190-08d90b44f609 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/37crs4.pdf "Datasheet as PDF")