--- title: "EX28 — Quenched and tempered steels" description: "EX28 in AISI / SAE: material number 1.6755, also listed as 22NiMoCr4-7. Category: Quenched and tempered steels. Designations recorded for this grade: 7." canonical: https://steelequivalents.com/materials/aisi-sae/ex28 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/aisi-sae/ex28.md cs: https://steelequivalents.com/cs/materiály/aisi-sae/ex28.md de: https://steelequivalents.com/de/werkstoffe/aisi-sae/ex28.md es: https://steelequivalents.com/es/materiales/aisi-sae/ex28.md fr: https://steelequivalents.com/fr/matériaux/aisi-sae/ex28.md hu: https://steelequivalents.com/hu/anyagok/aisi-sae/ex28.md it: https://steelequivalents.com/it/materiali/aisi-sae/ex28.md nl: https://steelequivalents.com/nl/materialen/aisi-sae/ex28.md pl: https://steelequivalents.com/pl/materiały/aisi-sae/ex28.md pt: https://steelequivalents.com/pt/materiais/aisi-sae/ex28.md ru: https://steelequivalents.com/ru/материалы/aisi-sae/ex28.md tr: https://steelequivalents.com/tr/malzemeler/aisi-sae/ex28.md zh: https://steelequivalents.com/zh/材料/aisi-sae/ex28.md ja: https://steelequivalents.com/ja/材料/aisi-sae/ex28.md ar: https://steelequivalents.com/ar/المواد/aisi-sae/ex28.md ko: https://steelequivalents.com/ko/재료/aisi-sae/ex28.md pt-br: https://steelequivalents.com/pt-br/materiais/aisi-sae/ex28.md hi: https://steelequivalents.com/hi/सामग्री/aisi-sae/ex28.md content_hash: sha256:adc83d6c74795649ba1c728dd5988f671e39c3afd4ac576fe6161961c4fb4d2f 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/aisi-sae/ex28 > Canonical URL: https://steelequivalents.com/materials/aisi-sae/ex28 > 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 · 7 designations # EX28 EX28 is a designation in AISI / SAE for the material held under material number 1.6755, also listed as 22NiMoCr4-7. It is a material in the category Quenched and tempered steels. We list 7 designations recorded for this grade, in the standards DIN / EN, UNS and AISI / SAE. - [*Material no.* **1.6755**](/materials/material-no/1.6755 "Material no.: 1.6755") - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **7** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=5b4b4fe9-757e-488a-98f6-eec6a78f64ad&designation=94dc73df-8e7d-4aad-80fb-a66d40fd1e4a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/ex28.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 22NiMoCr4-7 This grade’s own name](/materials/din-en/22nimocr4-7 "DIN / EN 22NiMoCr4-7") - [UNS G47180 This grade’s own name](/materials/uns/g47180 "UNS G47180") - [AISI / SAE 4718 This grade’s own name](/materials/aisi-sae/4718 "AISI / SAE 4718") ## 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 7 designations · 3 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 - [22NiMoCr4-7 This grade’s own name](/materials/din-en/22nimocr4-7 "DIN / EN 22NiMoCr4-7") UNS United States · 3 - [G47180 This grade’s own name](/materials/uns/g47180 "UNS G47180") - [H47180 This grade’s own name](/materials/uns/h47180 "UNS H47180") - [K12766 This grade’s own name](/materials/uns/k12766 "UNS K12766") AISI / SAE United States · 3 - [4718 This grade’s own name](/materials/aisi-sae/4718 "AISI / SAE 4718") - [4718H This grade’s own name](/materials/aisi-sae/4718h "AISI / SAE 4718H") - **EX28 This grade’s own name** 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 Ni Mn Mo Iron — the balance, never listed by a standard — 96.6 % Ni — 0.9 % Mn — 0.8 % Mo — 0.7 % Traces & impurities · 1.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.17–0.27 | | Si | ≤ 0.4 | | Mn | 0.5–1 | | P | 0.035 | | S | 0.035 | | Cr | 0.3–0.5 | | Mo | 0.5–0.8 — Unusual | | Ni | 0.6–1.2 | 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 | 0,17-0,27 | 0.170 | 0.270 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,30-0,50 | 0.300 | 0.500 | Range | | Mn | 0,50-1,00 | 0.500 | 1.000 | Range | | Ni | 0,60-1,20 | 0.600 | 1.200 | Range | | Mo | 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 computed from composition · °C Predicted Ae3 788 °C Predicted Ae1 712 °C Predicted Acm 495 °C Predicted Bs 519 °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. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.6, a shared category, and a published range for Ni / 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. [22NiMoCr3-7 1.6751 Ni 0,60-1,20 · Mn 0,50-1,00 - ΔNi 0.00 - ΔMn 0.00 - 3 designations](/materials/din-en/22nimocr3-7 "22NiMoCr3-7")[1.6511 1.6511 Ni 0,90-1,20 · Mn 0,50-0,80 - ΔNi 0.15 - ΔMn 0.10 - 91 designations](/materials/material-no/1.6511 "1.6511")[1.6546 1.6546 Ni 0,40-0,70 · Mn 0,70-1,00 - ΔNi 0.35 - ΔMn 0.10 - 43 designations](/materials/material-no/1.6546 "1.6546")[33NiCrMo6 1.6567 Ni 1,20-1,60 · Mn 0,60-0,90 - ΔNi 0.50 - ΔMn 0.00 - 1 designations](/materials/din-en/33nicrmo6 "33NiCrMo6")[21CrMoNiV4-7 1.6981 Ni 0,20-0,80 · Mn 0,35-0,85 - ΔNi 0.40 - ΔMn 0.15 - 1 designations](/materials/din-en/21crmoniv4-7 "21CrMoNiV4-7")[28NiCrMo4 1.6513 Ni 1,00-1,30 · Mn 0,30-0,60 - ΔNi 0.25 - ΔMn 0.30 - 1 designations](/materials/din-en/28nicrmo4 "28NiCrMo4") ## 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=5b4b4fe9-757e-488a-98f6-eec6a78f64ad&designation=94dc73df-8e7d-4aad-80fb-a66d40fd1e4a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/ex28.pdf "Datasheet as PDF")