--- title: "S355JRC — Unalloyed structural steels" description: "S355JRC: 17 equivalent designations across 11 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/din-en/s355jrc language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/s355jrc.md cs: https://steelequivalents.com/cs/materiály/din-en/s355jrc.md de: https://steelequivalents.com/de/werkstoffe/din-en/s355jrc.md es: https://steelequivalents.com/es/materiales/din-en/s355jrc.md fr: https://steelequivalents.com/fr/matériaux/din-en/s355jrc.md hu: https://steelequivalents.com/hu/anyagok/din-en/s355jrc.md it: https://steelequivalents.com/it/materiali/din-en/s355jrc.md nl: https://steelequivalents.com/nl/materialen/din-en/s355jrc.md pl: https://steelequivalents.com/pl/materiały/din-en/s355jrc.md pt: https://steelequivalents.com/pt/materiais/din-en/s355jrc.md ru: https://steelequivalents.com/ru/материалы/din-en/s355jrc.md tr: https://steelequivalents.com/tr/malzemeler/din-en/s355jrc.md zh: https://steelequivalents.com/zh/材料/din-en/s355jrc.md ja: https://steelequivalents.com/ja/材料/din-en/s355jrc.md ar: https://steelequivalents.com/ar/المواد/din-en/s355jrc.md ko: https://steelequivalents.com/ko/재료/din-en/s355jrc.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/s355jrc.md hi: https://steelequivalents.com/hi/सामग्री/din-en/s355jrc.md content_hash: sha256:36d220ab32c0be7b49e5edd5a883b0b191bbfb2b8008269f0313d203eb866b6c generated: 2026-09-22 --- > **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/s355jrc > Canonical URL: https://steelequivalents.com/materials/din-en/s355jrc > 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 · 17 designations # S355JRC S355JRC is a material in the category [Unalloyed structural steels](/categories/unalloyed-structural-steels "Unalloyed structural steels"), held under material number 1.0551. We list 16 designations recorded for this grade, in the standards AISI / SAE, BS, AFNOR, JIS, GOST, UNI, SS, ČSN, PN and ÖNORM. Its recorded composition includes C ≤ 0.24%, Si ≤ 0.55%, P 0.045%, S 0.045% and Mn ≤ 1.6%. Recorded mechanical properties include Rm 471–491 N/mm², Re 255–294 N/mm², A5 17%, HB 131–217, Z 30% and KCU 343 kJ/m²; these figures vary with the delivery condition and dimension. Its recorded density is 7.81–7.85 g/cm³. Further recorded physical values: λ 38–76 W/(m·K), α 12.6–15.6 ·10⁻⁶/K and cp 470–571 J/(kg·K); several of these are temperature-dependent. Recorded transformation points: Ac1 735 °C, Ac3 813 °C, Ar1 677 °C and Ar3 796 °C. Its weldability is recorded as limited. - [*Material no.* **1.0551**](/materials/material-no/1.0551 "Material no.: 1.0551") - [*Category* **Unalloyed structural steels · 452 grades**](/categories/unalloyed-structural-steels "Category: Unalloyed structural steels · 452 grades") - *Designations* **17** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=58408782-00d4-43ce-9897-5f660c81a109&designation=6443a6b3-4eba-4c33-bd4e-62768115257e "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/s355jrc.pdf "Datasheet as PDF") ## About Unalloyed structural steels Unalloyed structural steels include all low-carbon steels in which the iron companions do not exceed specified minimum values. The yield strength, formability and weldability are the decisive factors for their use. They are soft, pliable, tough and stretchy, but cannot be hardened by heat treatment. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 17 designations · 11 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 - **S355JRC This grade’s own name** AISI / SAE United States · 5 - [Gr.N2 Indicative](/materials/aisi-sae/gr-n2 "AISI / SAE Gr.N2") - [GrLCB Indicative](/materials/aisi-sae/grlcb "AISI / SAE GrLCB") - [GrWCB Indicative](/materials/aisi-sae/grwcb "AISI / SAE GrWCB") - [J03002 Indicative](/materials/uns/j03002 "AISI / SAE J03002") - [J03003 Indicative](/materials/uns/j03003 "AISI / SAE J03003") BS United Kingdom · 1 - [161Gr400A Indicative](/materials/bs/161gr400a "BS 161Gr400A") AFNOR France · 1 - [E26-52-M Indicative](/materials/afnor/e26-52-m "AFNOR E26-52-M") JIS Japan · 2 - [SC450 Indicative](/materials/jis/sc450 "JIS SC450") - [SC480 Indicative](/materials/jis/sc480 "JIS SC480") GOST Russia / CIS · 2 - [30L Indicative](/materials/gost/30l "GOST 30L") - [30Л Indicative](/materials/gost/30l "GOST 30Л") UNI Italy · 1 - [FeG49-1 Indicative](/materials/uni/feg49-1 "UNI FeG49-1") SS Sweden · 1 - [1505 Indicative](/materials/ss/1505 "SS 1505") ČSN Czechia · 1 - [422 650 Indicative](/materials/csn/422650 "ČSN 422 650") PN Poland · 1 - [LII500 Indicative](/materials/pn/lii500 "PN LII500") ÖNORM Austria · 1 - [GS52 Indicative](/materials/din-en/gs-52 "ÖNORM GS52") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 6 elements on file · weight % What this alloy is Fe Mn Si C Iron — the balance, never listed by a standard — 97.5 % Mn — 1.6 % Si — 0.6 % C — 0.2 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.24 | | Si | ≤ 0.55 | | Mn | ≤ 1.6 | | P | 0.045 | | S | 0.045 | | N | 0.009 | Carbon Silicon Manganese Phosphorus Sulfur 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 | ≤0,24 | — | 0.240 | Max | | N | 0,009 | 0.009 | 0.009 | Exact | | Si | ≤0,55 | — | 0.550 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,045 | 0.045 | 0.045 | Exact | | Mn | ≤1,60 | — | 1.600 | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni, Cr, Mo. ## Physical & mechanical properties Density 7,85 g/cm³ Exact Transformation point Ac1 735 °C Exact Transformation point Ac3 813 °C Exact · Ac3(Acm) Transformation point Ar3 796 °C Exact · Ar3(Arcm) Transformation point Ar1 677 °C Exact Weldability weldable with restrictions As published: limited weldability. 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 3 conditions · 23 values By dimension**Normalizing 880 - 900°C,Drawing 610 - 630°C** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | to 100 | 471 | 255 | 17 | 30 | 343 | By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Casting, GOST 977-88 | 491 | 294 | 17 | 30 | 343 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | Specific heat capacity J/(kg·K) | |---|---|---|---|---| | 20 | 7.81 | — | — | — | | 100 | — | 12.6 | 76 | 470 | | 200 | — | 13.9 | 65 | 483 | | 400 | — | 15 | 44 | 525 | | 500 | — | 15.6 | 38 | — | | 600 | — | — | — | 571 | 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 / 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. [S355JR 1.0045 Mn ≤1,60 · Si ≤0,55 - ΔMn 0.00 - ΔSi 0.00 - 32 designations](/materials/din-en/s355jr "S355JR")[S320GP 1.0046 Mn ≤1,60 · Si ≤0,55 - ΔMn 0.00 - ΔSi 0.00 - 3 designations](/materials/din-en/s320gp "S320GP")[S355GP 1.0083 Mn ≤1,60 · Si ≤0,55 - ΔMn 0.00 - ΔSi 0.00 - 5 designations](/materials/din-en/s355gp "S355GP")[P235G1T1 1.0253 Mn ≤1,60 · Si ≤0,55 - ΔMn 0.00 - ΔSi 0.00 - 3 designations](/materials/din-en/p235g1t1 "P235G1T1")[P275T1 1.0256 Mn ≤1,60 · Si ≤0,55 - ΔMn 0.00 - ΔSi 0.00 - 7 designations](/materials/din-en/p275t1 "P275T1")[E370 1.0261 Mn ≤1,60 · Si ≤0,55 - ΔMn 0.00 - ΔSi 0.00 - 2 designations](/materials/din-en/e370 "E370") ## 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=58408782-00d4-43ce-9897-5f660c81a109&designation=6443a6b3-4eba-4c33-bd4e-62768115257e "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/s355jrc.pdf "Datasheet as PDF")