--- title: "EX26 — Case hardening steels" description: "EX26 in AISI / SAE: material number 1.7325, also listed as 25MoCr4. Category: Case hardening steels. Designations recorded for this grade: 5." canonical: https://steelequivalents.com/materials/aisi-sae/ex26 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/aisi-sae/ex26.md cs: https://steelequivalents.com/cs/materiály/aisi-sae/ex26.md de: https://steelequivalents.com/de/werkstoffe/aisi-sae/ex26.md es: https://steelequivalents.com/es/materiales/aisi-sae/ex26.md fr: https://steelequivalents.com/fr/matériaux/aisi-sae/ex26.md hu: https://steelequivalents.com/hu/anyagok/aisi-sae/ex26.md it: https://steelequivalents.com/it/materiali/aisi-sae/ex26.md nl: https://steelequivalents.com/nl/materialen/aisi-sae/ex26.md pl: https://steelequivalents.com/pl/materiały/aisi-sae/ex26.md pt: https://steelequivalents.com/pt/materiais/aisi-sae/ex26.md ru: https://steelequivalents.com/ru/материалы/aisi-sae/ex26.md tr: https://steelequivalents.com/tr/malzemeler/aisi-sae/ex26.md zh: https://steelequivalents.com/zh/材料/aisi-sae/ex26.md ja: https://steelequivalents.com/ja/材料/aisi-sae/ex26.md ar: https://steelequivalents.com/ar/المواد/aisi-sae/ex26.md ko: https://steelequivalents.com/ko/재료/aisi-sae/ex26.md pt-br: https://steelequivalents.com/pt-br/materiais/aisi-sae/ex26.md hi: https://steelequivalents.com/hi/सामग्री/aisi-sae/ex26.md content_hash: sha256:31c5a6af696b949a45bbe30f4373a89c61109008357408b155dc312ddc75d1c1 generated: 2026-09-21 --- > **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/aisi-sae/ex26 > Canonical URL: https://steelequivalents.com/materials/aisi-sae/ex26 > 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. AISI / SAE · United States · 5 designations # EX26 EX26 is a designation in AISI / SAE for the material held under material number 1.7325, also listed as 25MoCr4. It is a material in the category Case hardening steels. We list 5 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE and SRPS. - [*Material no.* **1.7325**](/materials/material-no/1.7325 "Material no.: 1.7325") - [*Category* **Case hardening steels · 60 grades**](/categories/case-hardening-steels "Category: Case hardening steels · 60 grades") - *Designations* **5** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=83dee99a-b561-4b3e-80f5-09bc4587cd8b&designation=500bc582-fc32-4d5b-ae00-d52d44f23618 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/ex26.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 25MoCr4 This grade’s own name](/materials/din-en/25mocr4 "DIN / EN 25MoCr4") - [UNS G86520 This grade’s own name](/materials/uns/g86520 "UNS G86520") - [AISI / SAE 8625 This grade’s own name](/materials/aisi-sae/8625 "AISI / SAE 8625") ## 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. ## Also known as 5 designations · 4 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 - [25MoCr4 This grade’s own name](/materials/din-en/25mocr4 "DIN / EN 25MoCr4") UNS United States · 1 - [G86520 This grade’s own name](/materials/uns/g86520 "UNS G86520") AISI / SAE United States · 2 - [8625 This grade’s own name](/materials/aisi-sae/8625 "AISI / SAE 8625") - **EX26 This grade’s own name** SRPS Serbia · 1 - [Č.7421 Indicative](/materials/srps/c-7421 "SRPS Č.7421") 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 Cr Mo Iron — the balance, never listed by a standard — 97.7 % Mn — 0.8 % Cr — 0.5 % Mo — 0.5 % Traces & impurities · 0.6 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.23–0.29 — Unusual | | Si | 0.15–0.4 | | Mn | 0.6–0.9 | | P | 0.035 | | S | 0.035 | | Cr | 0.4–0.6 | | Mo | 0.4–0.5 | | Al | ≥ 0.02 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Aluminium 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 | 0,23-0,29 | 0.230 | 0.290 | Range | | Al | (≥0,02) | 0.020 | — | Min | | Si | 0,15-0,40 | 0.150 | 0.400 | Range | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,40-0,60 | 0.400 | 0.600 | Range | | Mn | 0,60-0,90 | 0.600 | 0.900 | Range | | Mo | 0,40-0,50 | 0.400 | 0.500 | 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 7,85 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 Mn / Cr 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. [25MoCrS4 1.7326 Mn 0,60-0,90 · Cr 0,40-0,60 - ΔMn 0.00 - ΔCr 0.00 - 2 designations](/materials/din-en/25mocrs4 "25MoCrS4")[20MoCrS3 1.7319 Mn 0,60-0,90 · Cr 0,40-0,70 - ΔMn 0.00 - ΔCr 0.05 - 3 designations](/materials/din-en/20mocrs3 "20MoCrS3")[20MoCr3 1.7320 Mn 0,60-0,90 · Cr 0,40-0,70 - ΔMn 0.00 - ΔCr 0.05 - 3 designations](/materials/din-en/20mocr3 "20MoCr3")[20CrMoS2 1.7311 Mn 0,60-0,80 · Cr 0,50-0,70 - ΔMn 0.05 - ΔCr 0.10 - 2 designations](/materials/din-en/20crmos2 "20CrMoS2")[20MoCr4 1.7321 Mn 0,70-1,00 · Cr 0,30-0,60 - ΔMn 0.10 - ΔCr 0.05 - 9 designations](/materials/din-en/20mocr4 "20MoCr4")[20MoCrS4 1.7323 Mn 0,70-1,00 · Cr 0,30-0,60 - ΔMn 0.10 - ΔCr 0.05 - 3 designations](/materials/din-en/20mocrs4 "20MoCrS4") ## 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=83dee99a-b561-4b3e-80f5-09bc4587cd8b&designation=500bc582-fc32-4d5b-ae00-d52d44f23618 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/ex26.pdf "Datasheet as PDF")