--- title: "1.5419 — Heat-resistant structural steels" description: "1.5419 is the material number of the grade also listed as GS-22 Mo 4. Category: Heat-resistant structural steels. Designations recorded for this grade: 6." canonical: https://steelequivalents.com/materials/material-no/1.5419 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.5419.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.5419.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.5419.md es: https://steelequivalents.com/es/materiales/número-de-material/1.5419.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.5419.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.5419.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.5419.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.5419.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.5419.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.5419.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.5419.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.5419.md zh: https://steelequivalents.com/zh/材料/材料编号/1.5419.md ja: https://steelequivalents.com/ja/材料/材料番号/1.5419.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.5419.md ko: https://steelequivalents.com/ko/재료/재료번호/1.5419.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.5419.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.5419.md content_hash: sha256:f1ab5afe6714955d22a1745d51eb8c224439abf0ff0659975b09081637e28752 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/1.5419 > Canonical URL: https://steelequivalents.com/materials/material-no/1.5419 > 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 · 6 designations # 1.5419 1.5419 is the material number of the grade also listed as GS-22 Mo 4. It is a material in the category Heat-resistant structural steels. We list 6 designations recorded for this grade, in the standards DIN / EN, UNS and AISI / SAE. - ***Material no.* **1.5419**** - [*Category* **Heat-resistant structural steels · 62 grades**](/categories/heat-resistant-structural-steels "Category: Heat-resistant structural steels · 62 grades") - *Designations* **6** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=a08ee3b1-9780-4250-8611-fd80b256e065 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.5419.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN G20Mo5 This grade’s own name](/materials/din-en/g20mo5 "DIN / EN G20Mo5") - [UNS G44220 This grade’s own name](/materials/uns/g44220 "UNS G44220") - [AISI / SAE 4422 This grade’s own name](/materials/aisi-sae/4422 "AISI / SAE 4422") ## About Heat-resistant structural steels Heat-resistant structural steels are structural steels designed to retain useful strength and dimensional stability at elevated temperatures. They are used for load-bearing components in hot-service equipment where mechanical performance must be maintained during heating. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 6 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 · 2 - [G20Mo5 This grade’s own name](/materials/din-en/g20mo5 "DIN / EN G20Mo5") - [GS-22 Mo 4 This grade’s own name Withdrawn](/materials/din-en/gs-22-mo-4 "DIN / EN GS-22 Mo 4") UNS United States · 3 - [G44220 This grade’s own name](/materials/uns/g44220 "UNS G44220") - [J12522 This grade’s own name](/materials/uns/j12522 "UNS J12522") - [J12524 This grade’s own name](/materials/uns/j12524 "UNS J12524") AISI / SAE United States · 1 - [4422 This grade’s own name](/materials/aisi-sae/4422 "AISI / SAE 4422") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 10 elements on file · weight % What this alloy is Fe Mn Si Mo Iron — the balance, never listed by a standard — 96.9 % Mn — 0.8 % Si — 0.6 % Mo — 0.5 % Traces & impurities · 1.3 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.15–0.23 | | Si | ≤ 0.6 | | Mn | 0.5–1 | | P | 0.025 | | S | 0.02 | | Cr | ≤ 0.3 | | Mo | 0.4–0.6 | | Ni | 0.4 | | V | ≤ 0.05 | | Cu | ≤ 0.3 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Vanadium Copper 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 | 0,15-0,23 | 0.150 | 0.230 | Range | | Si | ≤0,60 | — | 0.600 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,02 | 0.020 | 0.020 | Exact | | V | ≤0,05 | — | 0.050 | Max | | Cr | ≤0,30 | — | 0.300 | Max | | Mn | 0,50-1,00 | 0.500 | 1.000 | Range | | Ni | 0,4 | 0.400 | 0.400 | Exact | | Cu | ≤0,30 | — | 0.300 | Max | | Mo | 0,40-0,60 | 0.400 | 0.600 | 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 818 °C Predicted Ae1 723 °C Predicted Acm 463 °C Predicted Bs 548 °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 1.5, a shared category, and a published range for Mn / Mo 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. [21MoV5-3 1.5404 Mn 0,50-0,80 · Mo 0,45-0,55 - ΔMn 0.10 - ΔMo 0.00 - 1 designations](/materials/din-en/21mov5-3 "21MoV5-3")[20MnMo3-5 1.5421 Mn 0,70-1,00 · Mo 0,40-0,60 - ΔMn 0.10 - ΔMo 0.00 - 3 designations](/materials/din-en/20mnmo3-5 "20MnMo3-5")[8MoB5-4 1.5450 Mn 0,60-0,80 · Mo 0,40-0,50 - ΔMn 0.05 - ΔMo 0.05 - 1 designations](/materials/din-en/8mob5-4 "8MoB5-4")[17MnMoCrV3-6 1.5405 Mn 0,60-0,80 · Mo 0,50-0,60 - ΔMn 0.05 - ΔMo 0.05 - 1 designations](/materials/din-en/17mnmocrv3-6 "17MnMoCrV3-6")[1.5423 1.5423 Mn 0,50-0,80 · Mo 0,45-0,65 - ΔMn 0.10 - ΔMo 0.05 - 20 designations](/materials/material-no/1.5423 "1.5423")[G18Mo5 1.5422 Mn 0,80-1,20 · Mo 0,45-0,65 - ΔMn 0.25 - ΔMo 0.05 - 1 designations](/materials/din-en/g18mo5 "G18Mo5") ## 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=a08ee3b1-9780-4250-8611-fd80b256e065 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.5419.pdf "Datasheet as PDF")