--- title: "StE240.7TM — Fine-grain structural steels" description: "StE240.7TM in DIN / EN: material number 1.0418, also listed as L245MB. Category: Fine-grain structural steels. Designations recorded for this grade: 4." canonical: https://steelequivalents.com/materials/din-en/ste240-7tm language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/ste240-7tm.md cs: https://steelequivalents.com/cs/materiály/din-en/ste240-7tm.md de: https://steelequivalents.com/de/werkstoffe/din-en/ste240-7tm.md es: https://steelequivalents.com/es/materiales/din-en/ste240-7tm.md fr: https://steelequivalents.com/fr/matériaux/din-en/ste240-7tm.md hu: https://steelequivalents.com/hu/anyagok/din-en/ste240-7tm.md it: https://steelequivalents.com/it/materiali/din-en/ste240-7tm.md nl: https://steelequivalents.com/nl/materialen/din-en/ste240-7tm.md pl: https://steelequivalents.com/pl/materiały/din-en/ste240-7tm.md pt: https://steelequivalents.com/pt/materiais/din-en/ste240-7tm.md ru: https://steelequivalents.com/ru/материалы/din-en/ste240-7tm.md tr: https://steelequivalents.com/tr/malzemeler/din-en/ste240-7tm.md zh: https://steelequivalents.com/zh/材料/din-en/ste240-7tm.md ja: https://steelequivalents.com/ja/材料/din-en/ste240-7tm.md ar: https://steelequivalents.com/ar/المواد/din-en/ste240-7tm.md ko: https://steelequivalents.com/ko/재료/din-en/ste240-7tm.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/ste240-7tm.md hi: https://steelequivalents.com/hi/सामग्री/din-en/ste240-7tm.md content_hash: sha256:4dfd20429e2e4e2fe6ef6f6590881a3b5b3d0fa8869e8825d0c328e54ff2c22a 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/din-en/ste240-7tm > Canonical URL: https://steelequivalents.com/materials/din-en/ste240-7tm > 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. DIN / EN · Europe · 4 designations # StE240.7TM StE240.7TM is a designation in DIN / EN for the material held under material number 1.0418, also listed as L245MB. It is a material in the category Fine-grain structural steels. We list 4 designations recorded for this grade, in the standards DIN / EN and UNS. - [*Material no.* **1.0418**](/materials/material-no/1.0418 "Material no.: 1.0418") - [*Category* **Fine-grain structural steels · 50 grades**](/categories/fine-grain-structural-steels "Category: Fine-grain structural steels · 50 grades") - *Designations* **4** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=664150cd-5c92-4103-92a6-d00889f403ae&designation=a0ff50e8-0e37-43b2-99f2-4ed4ebe4fafc "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/ste240-7tm.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN L245MB This grade’s own name](/materials/din-en/l245mb "DIN / EN L245MB") - [UNS K03005 This grade’s own name · 4 grades on that route](/materials/uns/k03005 "UNS K03005") ## About Fine-grain structural steels Fine-grain structural steel is a name for structural steels whose properties are particularly suitable for welding. They have a higher yield strength than comparable steels. Due to the negative influence of carbon on the weldability of a material, the maximum carbon content in fine-grained structural steels is less than 0.2%. These properties are achieved in steelmaking by the addition of oxygen and nitrogen-binding elements. The fine grain in the metallurgical structure is achieved by alloying elements whose nitrides and carbides only dissolve at higher temperatures. With the same composition, they are stronger and tougher than coarse-grained steels. Fine-grained structural steels are used above all in reinforced concrete structures such as bridges, in the construction of cranes, hydraulic cylinders or other welded structures due to their special welding suitability and in the offshore area. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 4 designations · 2 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 - [L245MB This grade’s own name](/materials/din-en/l245mb "DIN / EN L245MB") - **StE240.7TM Indicative** UNS United States · 2 - [K03005 This grade’s own name](/materials/uns/k03005 "UNS K03005") - [K03006 Indicative](/materials/uns/k03006 "UNS K03006") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 13 elements on file · weight % What this alloy is Fe Mn Si Cr Iron — the balance, never listed by a standard — 96.8 % Mn — 1.5 % Si — 0.5 % Cr — 0.3 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.16 | | Si | ≤ 0.45 | | Mn | ≤ 1.5 | | P | 0.025 | | S | 0.02 | | Cr | ≤ 0.3 | | Mo | ≤ 0.1 | | Ni | ≤ 0.3 | | V | ≤ 0.04 | | Cu | ≤ 0.25 | | Al | 0.015–0.06 | | Nb | ≤ 0.04 | | N | 0.012 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Vanadium Copper Aluminium Niobium Nitrogen 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 | ≤0,16 | — | 0.160 | Max | | N | 0,012 | 0.012 | 0.012 | Exact | | Al | 0,015-0,060 | 0.015 | 0.060 | Range | | Si | ≤0,45 | — | 0.450 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,02 | 0.020 | 0.020 | Exact | | V | ≤0,040 | — | 0.040 | Max | | Cr | ≤0,30 | — | 0.300 | Max | | Mn | ≤1,50 | — | 1.500 | Max | | Ni | ≤0,30 | — | 0.300 | Max | | Cu | ≤0,25 | — | 0.250 | Max | | Nb | ≤0,04 | — | 0.040 | Max | | Mo | ≤0,10 | — | 0.100 | Max | 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 819 °C Predicted Ae1 715 °C Predicted Acm 403 °C Predicted Bs 556 °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 1.0, 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. [RoSt 52-3 1.0576 Mn ≤1,60 · Si ≤0,55 - ΔMn 0.05 - ΔSi 0.05 - 6 designations](/materials/din-en/rost-52-3 "RoSt 52-3")[P245GH 1.0352 Mn 0,50-1,30 · Si ≤0,40 - ΔMn 0.15 - ΔSi 0.02 - 3 designations](/materials/din-en/p245gh "P245GH")[C22.3 1.0427 Mn 0,30-0,90 · Si 0,15-0,35 - ΔMn 0.15 - ΔSi 0.02 - 3 designations](/materials/din-en/c22-3 "C22.3")[S255N 1.0461 Mn 0,50-1,30 · Si ≤0,40 - ΔMn 0.15 - ΔSi 0.02 - 18 designations](/materials/din-en/s255n "S255N")[P255NH 1.0462 Mn 0,50-1,30 · Si ≤0,40 - ΔMn 0.15 - ΔSi 0.02 - 4 designations](/materials/din-en/p255nh "P255NH")[P255NL 1.0463 Mn 0,50-1,30 · Si ≤0,40 - ΔMn 0.15 - ΔSi 0.02 - 6 designations](/materials/din-en/p255nl "P255NL") ## 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=664150cd-5c92-4103-92a6-d00889f403ae&designation=a0ff50e8-0e37-43b2-99f2-4ed4ebe4fafc "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/ste240-7tm.pdf "Datasheet as PDF")