--- title: "1.7214 — Special steels for aviation and aerospace" description: "1.7214 is the material number of the grade also listed as 25CrMo4. It is a material in the category Special steels for aviation and aerospace." canonical: https://steelequivalents.com/materials/material-no/1.7214 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.7214.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.7214.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.7214.md es: https://steelequivalents.com/es/materiales/número-de-material/1.7214.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.7214.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.7214.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.7214.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.7214.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.7214.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.7214.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.7214.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.7214.md zh: https://steelequivalents.com/zh/材料/材料编号/1.7214.md ja: https://steelequivalents.com/ja/材料/材料番号/1.7214.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.7214.md ko: https://steelequivalents.com/ko/재료/재료번호/1.7214.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.7214.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.7214.md content_hash: sha256:e50b7aa982ec64a3dd122f3365a1255ff5e10bb3fb305f3ec6c37c20f0487328 generated: 2026-09-24 --- > **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/material-no/1.7214 > Canonical URL: https://steelequivalents.com/materials/material-no/1.7214 > 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. Material number · Europe · 29 designations # 1.7214 1.7214 is the material number of the grade also listed as 25CrMo4. It is a material in the category Special steels for aviation and aerospace. We list 29 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, SAE AMS, JIS, GB and GOST. - ***Material no.* **1.7214**** - [*Category* **Special steels for aviation and aerospace · 39 grades**](/categories/special-steels-for-aviation-and-aerospace "Category: Special steels for aviation and aerospace · 39 grades") - *Designations* **29** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=85d29b92-c092-4b16-b819-526c22e745e5 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.7214.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 25CrMo4 This grade’s own name · 3 grades on that route](/materials/din-en/25crmo4 "DIN / EN 25CrMo4") ## About Special steels for aviation and aerospace Special steels for aviation and aerospace are engineered steels designed to provide controlled mechanical properties and reliable performance in demanding service. Their alloying and heat-treatment capabilities support components that require a combination of strength, toughness and fatigue resistance, including aircraft structures and engine parts. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 29 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 · 1 - [25CrMo4 This grade’s own name](/materials/din-en/25crmo4 "DIN / EN 25CrMo4") UNS United States · 2 - [G41300 Indicative](/materials/uns/g41300 "UNS G41300") - [J24056 Indicative](/materials/uns/j24056 "UNS J24056") AISI / SAE United States · 1 - [4130 Indicative](/materials/aisi-sae/4130 "AISI / SAE 4130") ASTM United States · 3 - [4125 Indicative](/materials/astm/4125 "ASTM 4125") - [A322 Indicative](/materials/astm/a322 "ASTM A322") - [A331 Indicative](/materials/astm/a331 "ASTM A331") BS United Kingdom · 4 - [1717COS110 Indicative](/materials/bs/1717cos110 "BS 1717COS110") - [En20A Indicative](/materials/bs/en20a "BS En20A") - [S534 Indicative](/materials/bs/s534 "BS S534") - [S535 Indicative](/materials/bs/s535 "BS S535") AFNOR France · 2 - [25CD4 Indicative](/materials/afnor/25cd4 "AFNOR 25CD4") - [30CD4 Indicative](/materials/afnor/30cd4 "AFNOR 30CD4") SAE AMS United States / Aerospace · 10 - [6345 Indicative plate sheet](/materials/ams/6345 "SAE AMS 6345") - [6346 Indicative bar](/materials/ams/6346 "SAE AMS 6346") - [6348 Indicative bar](/materials/ams/6348 "SAE AMS 6348") - [6350 Indicative plate sheet](/materials/ams/6350 "SAE AMS 6350") - [6351 Indicative plate sheet](/materials/ams/6351 "SAE AMS 6351") - [6360 Indicative](/materials/ams/6360 "SAE AMS 6360") - [6361 Indicative](/materials/ams/6361 "SAE AMS 6361") - [6370 Indicative bar plate sheet strip](/materials/ams/6370 "SAE AMS 6370") - [6371 Indicative tube](/materials/ams/6371 "SAE AMS 6371") - [6374 Indicative](/materials/ams/6374 "SAE AMS 6374") JIS Japan · 2 - [SCM420 Indicative](/materials/ks/scm420 "JIS SCM420") - [SCM430 Indicative](/materials/ks/scm430 "JIS SCM430") GB China · 2 - [25CrMo Indicative](/materials/gb/25crmo "GB 25CrMo") - [30CrMo Indicative](/materials/gb/30crmo "GB 30CrMo") GOST Russia / CIS · 2 - [30XM Indicative](/materials/gost/30xm "GOST 30XM") - [ст.30XM Indicative](/materials/gost/st-30xm "GOST ст.30XM") 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 Cr Mn Ni Iron — the balance, never listed by a standard — 97.3 % Cr — 1.1 % Mn — 0.7 % Ni — 0.3 % Traces & impurities · 0.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.22–0.29 | | Si | 0.15–0.35 | | Mn | 0.5–0.8 | | P | 0.02 | | S | 0.015 | | Cr | 0.9–1.2 | | Mo | 0.15–0.25 | | Ni | ≤ 0.3 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel 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 | 0,22-0,29 | 0.220 | 0.290 | Range | | Si | 0,15-0,35 | 0.150 | 0.350 | Range | | P | 0,02 | 0.020 | 0.020 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 0,90-1,20 | 0.900 | 1.200 | Range | | Mn | 0,50-0,80 | 0.500 | 0.800 | Range | | Ni | ≤0,30 | — | 0.300 | Max | | Mo | 0,15-0,25 | 0.150 | 0.250 | Range | - jetzt 1.7218 - jetzt 1.7218 - jetzt 1.7218 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 computed from composition · °C Predicted Ae3 800 °C Predicted Ae1 743 °C Predicted Acm 537 °C Predicted Bs 537 °C These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either. ## 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 5 conditions · 8 values By thickness**Quenched and tempered** source `steelnumber` | Thickness mm | ReH N/mm² | Rm N/mm² | |---|---|---| | 0.3 – 3 | — | 990 – 1400 | | ≤ 60 | 345 – 355 | — | By thickness**Soft annealed** source `steelnumber` | Thickness mm | Rm N/mm² | A80% | |---|---|---| | 0.3 – 3 | 580 | 19 | 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 | HV | |---|---|---| | Soft annealed | 212 | 175 | By delivery state**Quenched and tempered** source `steelnumber` | Delivery state | HV | |---|---| | Quenched and tempered | 305 – 435 | 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. [J24056 1.7254 Cr 0,80-1,10 · Mn 0,50-0,70 - ΔCr 0.10 - ΔMn 0.05 - 1 designations](/materials/uns/j24056 "J24056") ## 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=85d29b92-c092-4b16-b819-526c22e745e5 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.7214.pdf "Datasheet as PDF")