--- title: "1.5450 — Heat-resistant structural steels" description: "1.5450 is the material number of the grade also listed as 8MoB5-4. Category: Heat-resistant structural steels. Designations recorded for this grade: 1." canonical: https://steelequivalents.com/materials/material-no/1.5450 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.5450.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.5450.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.5450.md es: https://steelequivalents.com/es/materiales/número-de-material/1.5450.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.5450.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.5450.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.5450.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.5450.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.5450.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.5450.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.5450.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.5450.md zh: https://steelequivalents.com/zh/材料/材料编号/1.5450.md ja: https://steelequivalents.com/ja/材料/材料番号/1.5450.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.5450.md ko: https://steelequivalents.com/ko/재료/재료번호/1.5450.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.5450.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.5450.md content_hash: sha256:569cc40c0a48942208e0848e2b5b3b2a15d6b48313c524cdee1ff80a83745bc3 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/1.5450 > Canonical URL: https://steelequivalents.com/materials/material-no/1.5450 > 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 · 1 designation # 1.5450 1.5450 is the material number of the grade also listed as 8MoB5-4. It is a material in the category Heat-resistant structural steels. We list 1 designations recorded for this grade, in the standards DIN / EN. - ***Material no.* **1.5450**** - [*Category* **Heat-resistant structural steels · 62 grades**](/categories/heat-resistant-structural-steels "Category: Heat-resistant structural steels · 62 grades") - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=72b54325-c54f-4510-8797-dd617251fff3 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.5450.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 8MoB5-4 This grade’s own name](/materials/din-en/8mob5-4 "DIN / EN 8MoB5-4") ## 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 1 designations · 1 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 - [8MoB5-4 This grade’s own name](/materials/din-en/8mob5-4 "DIN / EN 8MoB5-4") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 11 elements on file · weight % What this alloy is Fe Mn Mo Cu Iron — the balance, never listed by a standard — 97.9 % Mn — 0.7 % Mo — 0.5 % Cu — 0.3 % Traces & impurities · 0.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.06–0.1 | | Si | 0.1–0.35 | | Mn | 0.6–0.8 | | P | 0.025 | | S | 0.02 | | Cr | ≤ 0.2 | | Mo | 0.4–0.5 | | Cu | ≤ 0.3 | | Al | ≤ 0.06 | | Ti | ≤ 0.06 | | B | 0.002–0.006 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Copper Aluminium Titanium Boron 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 | |---|---|---|---|---| | B | 0,002-0,006 | 0.002 | 0.006 | Range | | C | 0,06-0,10 | 0.060 | 0.100 | Range | | Al | ≤0,060 | — | 0.060 | Max | | Si | 0,10-0,35 | 0.100 | 0.350 | Range | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,02 | 0.020 | 0.020 | Exact | | Ti | ≤0,060 | — | 0.060 | Max | | Cr | ≤0,20 | — | 0.200 | Max | | Mn | 0,60-0,80 | 0.600 | 0.800 | Range | | Cu | ≤0,30 | — | 0.300 | Max | | 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 1.5, 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 0.05 - ΔMo 0.05 - 1 designations](/materials/din-en/21mov5-3 "21MoV5-3")[17MnMoCrV3-6 1.5405 Mn 0,60-0,80 · Mo 0,50-0,60 - ΔMn 0.00 - ΔMo 0.10 - 1 designations](/materials/din-en/17mnmocrv3-6 "17MnMoCrV3-6")[G20Mo5 1.5419 Mn 0,50-1,00 · Mo 0,40-0,60 - ΔMn 0.05 - ΔMo 0.05 - 6 designations](/materials/din-en/g20mo5 "G20Mo5")[1.5423 1.5423 Mn 0,50-0,80 · Mo 0,45-0,65 - ΔMn 0.05 - ΔMo 0.10 - 20 designations](/materials/material-no/1.5423 "1.5423")[20MnMo3-5 1.5421 Mn 0,70-1,00 · Mo 0,40-0,60 - ΔMn 0.15 - ΔMo 0.05 - 3 designations](/materials/din-en/20mnmo3-5 "20MnMo3-5")[22Mo4 1.5429 Mn 0,40-0,70 · Mo 0,30-0,40 - ΔMn 0.15 - ΔMo 0.10 - 1 designations](/materials/din-en/22mo4 "22Mo4") ## 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=72b54325-c54f-4510-8797-dd617251fff3 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.5450.pdf "Datasheet as PDF")