--- title: "1.0545 — Fine-grain structural steels" description: "1.0545 is the material number of the grade also listed as S355NH. Category: Fine-grain structural steels. Designations recorded for this grade: 16." canonical: https://steelequivalents.com/materials/material-no/1.0545 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.0545.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.0545.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.0545.md es: https://steelequivalents.com/es/materiales/número-de-material/1.0545.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.0545.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.0545.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.0545.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.0545.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.0545.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.0545.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.0545.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.0545.md zh: https://steelequivalents.com/zh/材料/材料编号/1.0545.md ja: https://steelequivalents.com/ja/材料/材料番号/1.0545.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.0545.md ko: https://steelequivalents.com/ko/재료/재료번호/1.0545.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.0545.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.0545.md content_hash: sha256:adcec1ad556f7a5a2d0f0ceffd343f383256d23974df82961b2f456919631bea 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/1.0545 > Canonical URL: https://steelequivalents.com/materials/material-no/1.0545 > 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 · 16 designations # 1.0545 1.0545 is the material number of the grade also listed as S355NH. It is a material in the category Fine-grain structural steels. We list 16 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, GB, GOST, UNI and SS. - ***Material no.* **1.0545**** - [*Category* **Fine-grain structural steels · 50 grades**](/categories/fine-grain-structural-steels "Category: Fine-grain structural steels · 50 grades") - *Designations* **16** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=b02e2377-6480-458a-b83d-47b0af7e289b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.0545.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN S355NH This grade’s own name · 2 grades on that route](/materials/din-en/s355nh "DIN / EN S355NH") - [UNS K02803 This grade’s own name · 9 grades on that route](/materials/uns/k02803 "UNS K02803") ## 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 16 designations · 10 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 · 4 - [FeE355KGN Indicative](/materials/afnor/fee355kgn "DIN / EN FeE355KGN") - [S355N Indicative](/materials/afnor/s355n "DIN / EN S355N") - [S355NH This grade’s own name](/materials/din-en/s355nh "DIN / EN S355NH") - [StE 355 This grade’s own name](/materials/din-en/ste355 "DIN / EN StE 355") UNS United States · 3 - [K02803 This grade’s own name](/materials/uns/k02803 "UNS K02803") - [K12000 This grade’s own name](/materials/uns/k12000 "UNS K12000") - [K12709 This grade’s own name](/materials/uns/k12709 "UNS K12709") AISI / SAE United States · 1 - [A572Gr.50 Indicative](/materials/aisi-sae/a572gr-50 "AISI / SAE A572Gr.50") BS United Kingdom · 2 - [50DD Indicative](/materials/bs/50dd "BS 50DD") - [50E Indicative](/materials/bs/50e "BS 50E") AFNOR France · 1 - [E355R Indicative](/materials/afnor/e355r "AFNOR E355R") UNE Spain · 1 - [AE355KG Indicative](/materials/une/ae355kg "UNE AE355KG") GB China · 1 - [Q345D Indicative](/materials/gb/q345d "GB Q345D") GOST Russia / CIS · 1 - [15GF Indicative](/materials/gost/15gf "GOST 15GF") UNI Italy · 1 - [FeE355KGN Indicative](/materials/afnor/fee355kgn "UNI FeE355KGN") SS Sweden · 1 - [2134-01 Indicative](/materials/ss/2134-01 "SS 2134-01") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 14 elements on file · weight % What this alloy is Fe Mn Cu Si Iron — the balance, never listed by a standard — 96.3 % Mn — 1.3 % Cu — 0.6 % Si — 0.5 % Traces & impurities · 1.4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.2 | | Si | ≤ 0.5 | | Mn | 0.9–1.65 | | P | 0.03 | | S | 0.025 | | Cr | ≤ 0.3 | | Mo | ≤ 0.1 | | Ni | ≤ 0.5 | | V | ≤ 0.12 | | Cu | ≤ 0.55 | | Al | ≥ 0.02 | | Ti | ≤ 0.05 | | Nb | ≤ 0.05 | | N | 0.015 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Vanadium Copper Aluminium Titanium 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 | ≤0,20 | — | 0.200 | Max | | N | 0,015 | 0.015 | 0.015 | Exact | | Al | ≥0,02 | 0.020 | — | Min | | Si | ≤0,50 | — | 0.500 | Max | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,025 | 0.025 | 0.025 | Exact | | Ti | ≤0,05 | — | 0.050 | Max | | V | ≤0,12 | — | 0.120 | Max | | Cr | ≤0,30 | — | 0.300 | Max | | Mn | 0,90-1,65 | 0.900 | 1.650 | Range | | Ni | ≤0,50 | — | 0.500 | Max | | Cu | ≤0,55 | — | 0.550 | Max | | Nb | ≤0,05 | — | 0.050 | 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 808 °C Predicted Ae1 711 °C Predicted Acm 437 °C Predicted Bs 546 °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 Weldability readily weldable As published: without limitations. Flake sensitivity not susceptible As published: not predisposed Temper brittleness not susceptible As published: not predisposed 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. ## Properties by condition 4 conditions · 23 values By thickness**no delivery state stated** source `steelnumber` | Thickness mm | ReH N/mm² | A% | |---|---|---| | ≤ 16 | 355 | 22 | | 16 – 40 | 345 | 22 | | 40 – 63 | 335 | 22 | | 63 – 80 | 325 | 21 | | 80 – 100 | 315 | — | | 80 – 200 | — | 21 | | 100 – 150 | 295 | — | | 150 – 200 | 285 | — | | 200 – 250 | 275 | 21 | By thickness**Flat and long products** source `steelnumber` | Thickness mm | Rm N/mm² | |---|---| | ≤ 100 | 470 – 630 | | 100 – 200 | 450 – 600 | | 200 – 250 | 450 – 600 | By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | Re N/mm² | A5% | |---|---|---|---| | Sheet, GOST 19282-73 | 510 | 375 | 21 | By dimension**no delivery state stated** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | |---|---|---|---| | to 140 | 480 | 345 | 21 | Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ. ## 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 / Cu 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. [A633Gr.D 1.0546 Mn 0,90-1,65 · Cu ≤0,55 - ΔMn 0.00 - ΔCu 0.00 - 15 designations](/materials/din-en/a633gr-d "A633Gr.D")[S355NH 1.0539 Mn 0,90-1,65 · Cu ≤0,35 - ΔMn 0.00 - ΔCu 0.10 - 7 designations](/materials/din-en/s355nh "S355NH")[P305GH 1.0436 Mn 0,90-1,60 · Cu ≤0,30 - ΔMn 0.02 - ΔCu 0.13 - 38 designations](/materials/din-en/p305gh "P305GH")[1.0486 1.0486 Mn 0,80-1,50 · Cu ≤0,30 - ΔMn 0.13 - ΔCu 0.13 - 18 designations](/materials/material-no/1.0486 "1.0486")[P275NH 1.0487 Mn 0,80-1,50 · Cu ≤0,30 - ΔMn 0.13 - ΔCu 0.13 - 10 designations](/materials/din-en/p275nh "P275NH")[1.0562 1.0562 Mn 1,10-1,70 · Cu ≤0,30 - ΔMn 0.13 - ΔCu 0.13 - 74 designations](/materials/material-no/1.0562 "1.0562") ## 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=b02e2377-6480-458a-b83d-47b0af7e289b "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.0545.pdf "Datasheet as PDF")