--- title: "Fe510C1K1 — Weathering steels" description: "Fe510C1K1 in UNI: material number 1.8945, also listed as S355J0WP. Category: Weathering steels. Designations recorded for this grade: 37." canonical: https://steelequivalents.com/materials/uni/fe510c1k1 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uni/fe510c1k1.md cs: https://steelequivalents.com/cs/materiály/uni/fe510c1k1.md de: https://steelequivalents.com/de/werkstoffe/uni/fe510c1k1.md es: https://steelequivalents.com/es/materiales/uni/fe510c1k1.md fr: https://steelequivalents.com/fr/matériaux/uni/fe510c1k1.md hu: https://steelequivalents.com/hu/anyagok/uni/fe510c1k1.md it: https://steelequivalents.com/it/materiali/uni/fe510c1k1.md nl: https://steelequivalents.com/nl/materialen/uni/fe510c1k1.md pl: https://steelequivalents.com/pl/materiały/uni/fe510c1k1.md pt: https://steelequivalents.com/pt/materiais/uni/fe510c1k1.md ru: https://steelequivalents.com/ru/материалы/uni/fe510c1k1.md tr: https://steelequivalents.com/tr/malzemeler/uni/fe510c1k1.md zh: https://steelequivalents.com/zh/材料/uni/fe510c1k1.md ja: https://steelequivalents.com/ja/材料/uni/fe510c1k1.md ar: https://steelequivalents.com/ar/المواد/uni/fe510c1k1.md ko: https://steelequivalents.com/ko/재료/uni/fe510c1k1.md pt-br: https://steelequivalents.com/pt-br/materiais/uni/fe510c1k1.md hi: https://steelequivalents.com/hi/सामग्री/uni/fe510c1k1.md content_hash: sha256:2132caf78e9788ecb86958f4d0f18e447c7bc427c0f22af894b905e91d303af6 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/uni/fe510c1k1 > Canonical URL: https://steelequivalents.com/materials/uni/fe510c1k1 > 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. UNI · Italy · 37 designations # Fe510C1K1 Fe510C1K1 is a designation in UNI for the material held under material number 1.8945, also listed as S355J0WP. It is a material in the category Weathering steels. We list 37 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, ISO, JIS, GB, GOST, UNI, SS, ČSN, PN, STN, MSZ, BDS and ÖNORM. - [*Material no.* **1.8945**](/materials/material-no/1.8945 "Material no.: 1.8945") - [*Category* **Weathering steels · 27 grades**](/categories/weathering-steels "Category: Weathering steels · 27 grades") - *Designations* **37** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=0a29e7d0-0454-46f7-aa0c-26ac075ecc4f&designation=cba1d750-70b3-42cd-b17a-55dd70589bad "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uni/fe510c1k1.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN S355J0WP This grade’s own name](/materials/din-en/s355j0wp "DIN / EN S355J0WP") - [UNS K11535 This grade’s own name · 2 grades on that route](/materials/uns/k11535 "UNS K11535") ## About Weathering steels Weathering steels are structural steels designed to develop a protective patina when exposed to the atmosphere. This characteristic helps limit further corrosion and makes them suitable for bridges, building facades, rail vehicles and other outdoor structures where reduced coating maintenance is desirable. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 37 designations · 17 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 · 3 - [9CrNiCuP324 Indicative](/materials/din-en/9crnicup3-2-4 "DIN / EN 9CrNiCuP324") - [Fe510C1KI Indicative](/materials/din-en/fe510c1ki "DIN / EN Fe510C1KI") - [S355J0WP This grade’s own name](/materials/din-en/s355j0wp "DIN / EN S355J0WP") UNS United States · 1 - [K11535 This grade’s own name](/materials/uns/k11535 "UNS K11535") AISI / SAE United States · 2 - [Gr.1 Indicative](/materials/aisi-sae/gr-1 "AISI / SAE Gr.1") - [K02001 Indicative](/materials/uns/k02001 "AISI / SAE K02001") BS United Kingdom · 3 - [WR50A Indicative](/materials/bs/wr50a "BS WR50A") - [WR50B Indicative](/materials/bs/wr50b "BS WR50B") - [WR50C Indicative](/materials/bs/wr50c "BS WR50C") AFNOR France · 4 - [A37AP Indicative](/materials/afnor/a37ap "AFNOR A37AP") - [A37CP Indicative](/materials/afnor/a37cp "AFNOR A37CP") - [A37FP Indicative](/materials/afnor/a37fp "AFNOR A37FP") - [E36WA3 Indicative](/materials/afnor/e36wa3 "AFNOR E36WA3") ISO International · 1 - [Fe355W-1A Indicative](/materials/iso/fe355w-1a "ISO Fe355W-1A") JIS Japan · 3 - [SGV410 Indicative](/materials/jis/sgv410 "JIS SGV410") - [SPA-H Indicative](/materials/jis/spa-h "JIS SPA-H") - [STPL380 Indicative](/materials/jis/stpl380 "JIS STPL380") GB China · 1 - [09CuPCrNi-A Indicative](/materials/gb/09cupcrni-a "GB 09CuPCrNi-A") GOST Russia / CIS · 2 - [15K Indicative](/materials/gost/15k "GOST 15K") - [15К Indicative](/materials/gost/15k "GOST 15К") UNI Italy · 5 - [Fe360-1KG Indicative](/materials/uni/fe360-1kg "UNI Fe360-1KG") - [Fe360-2KG Indicative](/materials/uni/fe360-2kg "UNI Fe360-2KG") - [Fe410KW Indicative](/materials/uni/fe410kw "UNI Fe410KW") - **Fe510C1K1 Indicative** - [S355JOWP Indicative](/materials/uni/s355jowp "UNI S355JOWP") SS Sweden · 2 - [1330 Indicative](/materials/aisi-sae/1330 "SS 1330") - [1332 Indicative](/materials/ss/1332 "SS 1332") ČSN Czechia · 4 - [11368 Indicative](/materials/csn/11368 "ČSN 11368") - [11369 Indicative](/materials/csn/11369 "ČSN 11369") - [11418 Indicative](/materials/csn/11418 "ČSN 11418") - [15217 Indicative](/materials/csn/15217 "ČSN 15217") PN Poland · 2 - [10H Indicative](/materials/pn/10h "PN 10H") - [St41K Indicative](/materials/pn/st41k "PN St41K") STN Slovakia · 1 - [15 217 Indicative](/materials/csn/15217 "STN 15 217") MSZ Hungary · 1 - [KL2 Indicative](/materials/msz/kl2 "MSZ KL2") BDS Bulgaria · 1 - [16K Indicative](/materials/gost/16k "BDS 16K") ÖNORM Austria · 1 - [St35KW Indicative](/materials/onorm/st35kw "ÖNORM St35KW") 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 Cr Si Iron — the balance, never listed by a standard — 96.2 % Mn — 1 % Cr — 0.8 % Si — 0.8 % Traces & impurities · 1.3 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.12 | | Si | ≤ 0.75 | | Mn | ≤ 1 | | P | 0.06–0.15 | | S | 0.035 | | Cr | 0.3–1.25 | | Ni | 0.65 | | Cu | 0.25–0.55 | | N | 0.009 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel Copper 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 | ≤0,12 | — | 0.120 | Max | | N | 0,009 | 0.009 | 0.009 | Exact | | Si | ≤0,75 | — | 0.750 | Max | | P | 0,06-0,15 | 0.060 | 0.150 | Range | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,30-1,25 | 0.300 | 1.250 | Range | | Mn | ≤1,00 | — | 1.000 | Max | | Ni | (0,65) | 0.650 | 0.650 | Exact | | Cu | 0,25-0,55 | 0.250 | 0.550 | 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: Mo. ## Physical & mechanical properties Density 7,85 g/cm³ Exact Transformation point Ac1 724 °C Exact Transformation point Ac3 860 °C Exact · Ac3(Acm) Transformation point Ar3 830 °C Exact · Ar3(Arcm) Transformation point Ar1 676 °C 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 3 conditions · 64 values By thickness**no delivery state stated** source `steelnumber` | Thickness mm | ReH N/mm² | Rm N/mm² | A80% · Lo = 80 mm | A% · Lo = 5,65 √So | |---|---|---|---|---| | 1.5 – 2 | — | — | 16 | — | | 2 – 2.5 | — | — | 17 | — | | 2.5 – 3 | — | — | 18 | — | | ≤ 3 | — | 510 – 680 | — | — | | 3 – 100 | — | 470 – 630 | — | — | | 3 – 40 | — | — | — | 22 | | ≤ 16 | 355 | — | — | — | | 16 – 40 | 345 | — | — | — | By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | Re N/mm² | A5% | KCU kJ/m² | |---|---|---|---|---| | Sheet, GOST 5520-79 | 370 – 480 | 205 – 225 | 25 – 27 | 640 – 690 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Elastic modulus GPa | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | Specific heat capacity J/(kg·K) | Electrical resistivity nΩ·m | |---|---|---|---|---|---|---| | 20 | 7.87 | 211 | — | — | — | 200 | | 100 | 7.84 | 208 | — | 57 | 486 | 219 | | 200 | 7.81 | 205 | 12 | 53 | 498 | 292 | | 300 | 7.78 | 200 | 12.8 | — | 514 | 381 | | 400 | 7.74 | 191 | 13.2 | 45 | 533 | 487 | | 500 | 7.71 | 180 | 13.6 | — | 555 | 601 | | 600 | 7.67 | 165 | 13.85 | 38 | 584 | 758 | | 700 | 7.63 | — | — | — | 636 | 925 | | 800 | — | — | — | — | 703 | 1094 | | 900 | 7.61 | — | — | — | 703 | 1135 | | 1000 | 7.55 | — | — | — | 695 | 1167 | | 1100 | 7.49 | — | — | — | 691 | 1194 | | 1200 | — | — | — | — | 687 | 1219 | 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 1.8, a shared category, and a published range for Cr / Ni 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. [Fe510D1KI 1.8946 Cr 0,30-1,25 · Ni (0,65) - ΔCr 0.00 - ΔNi 0.00 - 7 designations](/materials/din-en/fe510d1ki "Fe510D1KI")[9CrNiCuP3-2-4 1.8962 Cr 0,50-1,25 · Ni 0,65 - ΔCr 0.10 - ΔNi 0.00 - 12 designations](/materials/din-en/9crnicup3-2-4 "9CrNiCuP3-2-4")[Fe360CKI 1.8958 Cr 0,40-0,80 · Ni (0,65) - ΔCr 0.17 - ΔNi 0.00 - 5 designations](/materials/din-en/fe360cki "Fe360CKI")[A709-50W 1.8959 Cr 0,40-0,80 · Ni (0,65) - ΔCr 0.17 - ΔNi 0.00 - 23 designations](/materials/din-en/a709-50w "A709-50W")[Fe360DKI 1.8961 Cr 0,40-0,80 · Ni (0,65) - ΔCr 0.17 - ΔNi 0.00 - 6 designations](/materials/din-en/fe360dki "Fe360DKI")[A600C 1.8963 Cr 0,40-0,80 · Ni 0,65 - ΔCr 0.17 - ΔNi 0.00 - 29 designations](/materials/din-en/a600c "A600C") ## 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=0a29e7d0-0454-46f7-aa0c-26ac075ecc4f&designation=cba1d750-70b3-42cd-b17a-55dd70589bad "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uni/fe510c1k1.pdf "Datasheet as PDF")