--- title: "1.5408 — Heat-resistant structural steels" description: "1.5408 is the material number of the grade also listed as 30MoB1. Category: Heat-resistant structural steels. Designations recorded for this grade: 1." canonical: https://steelequivalents.com/materials/material-no/1.5408 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.5408.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.5408.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.5408.md es: https://steelequivalents.com/es/materiales/número-de-material/1.5408.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.5408.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.5408.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.5408.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.5408.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.5408.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.5408.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.5408.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.5408.md zh: https://steelequivalents.com/zh/材料/材料编号/1.5408.md ja: https://steelequivalents.com/ja/材料/材料番号/1.5408.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.5408.md ko: https://steelequivalents.com/ko/재료/재료번호/1.5408.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.5408.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.5408.md content_hash: sha256:e0a166cf94a531ac6644d95692dbb13cda6c95918c60428c5d2cc739fc73d051 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/1.5408 > Canonical URL: https://steelequivalents.com/materials/material-no/1.5408 > 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 # 1.5408 1.5408 is the material number of the grade also listed as 30MoB1. 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.* **1.5408**** - [*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=8a93b5e4-029d-40e8-80c6-8d76cf8524d3 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.5408.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 30MoB1 This grade’s own name](/materials/din-en/30mob1 "DIN / EN 30MoB1") ## 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 - [30MoB1 This grade’s own name](/materials/din-en/30mob1 "DIN / EN 30MoB1") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 9 elements on file · weight % What this alloy is Fe Mn C Si Iron — the balance, never listed by a standard — 97.8 % Mn — 0.9 % C — 0.3 % Si — 0.3 % Traces & impurities · 0.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.28–0.32 | | Si | ≤ 0.3 | | Mn | 0.8–1 | | P | 0.025 | | S | 0.025 | | Cr | ≤ 0.3 | | Mo | 0.08–0.12 | | Cu | ≤ 0.25 | | B | 0.0008–0.005 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Copper 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 | 0,0008-0,0050 | 0.001 | 0.005 | Range | | C | 0,28-0,32 | 0.280 | 0.320 | Range | | Si | ≤0,30 | — | 0.300 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,025 | 0.025 | 0.025 | Exact | | Cr | ≤0,30 | — | 0.300 | Max | | Mn | 0,80-1,00 | 0.800 | 1.000 | Range | | Cu | ≤0,25 | — | 0.250 | Max | | Mo | 0,08-0,12 | 0.080 | 0.120 | 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 / Si 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. [11MnMo4-5 1.5425 Mn 0,85-1,15 · Si 0,08-0,22 - ΔMn 0.10 - ΔSi 0.00 - 5 designations](/materials/din-en/11mnmo4-5 "11MnMo4-5")[20MnMo3-5 1.5421 Mn 0,70-1,00 · Si 0,15-0,25 - ΔMn 0.05 - ΔSi 0.05 - 3 designations](/materials/din-en/20mnmo3-5 "20MnMo3-5")[37Mo2 1.5418 Mn 0,60-0,90 · Si ≤0,30 - ΔMn 0.15 - ΔSi 0.00 - 1 designations](/materials/din-en/37mo2 "37Mo2")[70 MoMn 10 4 1.5437 Mn 0,70-1,05 · Si 0,20-0,35 - ΔMn 0.03 - ΔSi 0.13 - 1 designations](/materials/din-en/70-momn-10-4 "70 MoMn 10 4")[26Mo2 1.5417 Mn ≤1,50 · Si ≤0,40 - ΔMn 0.15 - ΔSi 0.05 - 2 designations](/materials/din-en/26mo2 "26Mo2")[27MnMo3-3 1.5420 Mn 0,60-1,00 · Si 0,20-0,35 - ΔMn 0.10 - ΔSi 0.13 - 1 designations](/materials/din-en/27mnmo3-3 "27MnMo3-3") ## 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=8a93b5e4-029d-40e8-80c6-8d76cf8524d3 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.5408.pdf "Datasheet as PDF")