--- title: "SM490B — Fine-grain structural steels" description: "SM490B in KS: material number 1.0562, also listed as P355N. Category: Fine-grain structural steels. Designations recorded for this grade: 74." canonical: https://steelequivalents.com/materials/ks/sm490b language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/ks/sm490b.md cs: https://steelequivalents.com/cs/materiály/ks/sm490b.md de: https://steelequivalents.com/de/werkstoffe/ks/sm490b.md es: https://steelequivalents.com/es/materiales/ks/sm490b.md fr: https://steelequivalents.com/fr/matériaux/ks/sm490b.md hu: https://steelequivalents.com/hu/anyagok/ks/sm490b.md it: https://steelequivalents.com/it/materiali/ks/sm490b.md nl: https://steelequivalents.com/nl/materialen/ks/sm490b.md pl: https://steelequivalents.com/pl/materiały/ks/sm490b.md pt: https://steelequivalents.com/pt/materiais/ks/sm490b.md ru: https://steelequivalents.com/ru/материалы/ks/sm490b.md tr: https://steelequivalents.com/tr/malzemeler/ks/sm490b.md zh: https://steelequivalents.com/zh/材料/ks/sm490b.md ja: https://steelequivalents.com/ja/材料/ks/sm490b.md ar: https://steelequivalents.com/ar/المواد/ks/sm490b.md ko: https://steelequivalents.com/ko/재료/ks/sm490b.md pt-br: https://steelequivalents.com/pt-br/materiais/ks/sm490b.md hi: https://steelequivalents.com/hi/सामग्री/ks/sm490b.md content_hash: sha256:9752418452f3c6e7e4078d4965533571c0d24bd5e3cf1af4844ea5f28f6b904a 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/ks/sm490b > Canonical URL: https://steelequivalents.com/materials/ks/sm490b > 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. KS · South Korea · 74 designations # SM490B SM490B is a designation in KS for the material held under material number 1.0562, also listed as P355N. It is a material in the category Fine-grain structural steels. We list 74 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, SS, PN, MSZ, STAS, BDS, SFS and KS. - [*Material no.* **1.0562**](/materials/material-no/1.0562 "Material no.: 1.0562") - [*Category* **Fine-grain structural steels · 50 grades**](/categories/fine-grain-structural-steels "Category: Fine-grain structural steels · 50 grades") - *Designations* **74** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=aac68d21-d946-48a8-a9cb-cbe7dcfe0ef9&designation=09301b78-befe-468b-8f5b-4887eb21cef7 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/sm490b.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN P355N This grade’s own name](/materials/din-en/p355n "DIN / EN P355N") - [UNS K01600 This grade’s own name · 3 grades on that route](/materials/uns/k01600 "UNS K01600") ## 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 74 designations · 19 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 - [1.0562 Indicative](/materials/material-no/1.0562 "DIN / EN 1.0562") - [P355N This grade’s own name](/materials/din-en/p355n "DIN / EN P355N") - [StE 355 This grade’s own name](/materials/din-en/ste355 "DIN / EN StE 355") UNS United States · 17 - [K 12447 Indicative](/materials/uns/k12447 "UNS K 12447") - [K01600 This grade’s own name](/materials/uns/k01600 "UNS K01600") - [K02007 This grade’s own name](/materials/uns/k02007 "UNS K02007") - [K02700 This grade’s own name](/materials/uns/k02700 "UNS K02700") - [K02701 Indicative](/materials/uns/k02701 "UNS K02701") - [K02803 This grade’s own name](/materials/uns/k02803 "UNS K02803") - [K02900 Indicative](/materials/uns/k02900 "UNS K02900") - [K03009 This grade’s own name](/materials/uns/k03009 "UNS K03009") - [K03300 This grade’s own name](/materials/uns/k03300 "UNS K03300") - [K11803 This grade’s own name](/materials/uns/k11803 "UNS K11803") - [K12000 This grade’s own name](/materials/uns/k12000 "UNS K12000") - [K12001 Indicative](/materials/uns/k12001 "UNS K12001") - [K12037 This grade’s own name](/materials/uns/k12037 "UNS K12037") - [K12211 Indicative](/materials/uns/k12211 "UNS K12211") - [K12437 Indicative](/materials/uns/k12437 "UNS K12437") - [K12447 Indicative](/materials/uns/k12447 "UNS K12447") - [K12609 Indicative](/materials/uns/k12609 "UNS K12609") AISI / SAE United States · 10 - [A537CL1 Indicative](/materials/din-en/a537cl1 "AISI / SAE A537CL1") - [A588 Indicative](/materials/aisi-sae/a588 "AISI / SAE A588") - [A633 (C) Indicative](/materials/aisi-sae/a633-c "AISI / SAE A633 (C)") - [A633Gr.C Indicative](/materials/aisi-sae/a633gr-c "AISI / SAE A633Gr.C") - [A852 Indicative](/materials/aisi-sae/a852 "AISI / SAE A852") - [K01600 Indicative](/materials/uns/k01600 "AISI / SAE K01600") - [K02700 Indicative](/materials/uns/k02700 "AISI / SAE K02700") - [K02701 Indicative](/materials/uns/k02701 "AISI / SAE K02701") - [K02803 Indicative](/materials/uns/k02803 "AISI / SAE K02803") - [K11430 Indicative](/materials/uns/k11430 "AISI / SAE K11430") ASTM United States · 3 - [A 694 Grade F52 Indicative](/materials/astm/a-694-grade-f52 "ASTM A 694 Grade F52") - [A 860 Grade WPHY52 Indicative](/materials/astm/a-860-grade-wphy52 "ASTM A 860 Grade WPHY52") - [A633 Indicative](/materials/din-en/a633 "ASTM A633") BS United Kingdom · 3 - [223Gr.490 Indicative](/materials/bs/223gr-490 "BS 223Gr.490") - [50DD Indicative](/materials/bs/50dd "BS 50DD") - [P355N Indicative](/materials/din-en/p355n "BS P355N") AFNOR France · 10 - [A510AP Indicative](/materials/afnor/a510ap "AFNOR A510AP") - [E355R Indicative](/materials/afnor/e355r "AFNOR E355R") - [E355R/FP Indicative](/materials/afnor/e355r-fp "AFNOR E355R/FP") - [FeE355KGN Indicative](/materials/afnor/fee355kgn "AFNOR FeE355KGN") - [FP Indicative](/materials/afnor/fp "AFNOR FP") - [P355N Indicative](/materials/din-en/p355n "AFNOR P355N") - [S355M Indicative](/materials/din-en/s355m "AFNOR S355M") - [S355ML Indicative](/materials/din-en/s355ml "AFNOR S355ML") - [S355N Indicative](/materials/afnor/s355n "AFNOR S355N") - [S355NL Indicative](/materials/din-en/s355nl "AFNOR S355NL") UNE Spain · 4 - [AE355DD Indicative](/materials/une/ae355dd "UNE AE355DD") - [AE355KG Indicative](/materials/une/ae355kg "UNE AE355KG") - [DD Indicative](/materials/une/dd "UNE DD") - [P355N Indicative](/materials/din-en/p355n "UNE P355N") ISO International · 1 - [E355 Indicative](/materials/din-en/e355 "ISO E355") JIS Japan · 6 - [SM490A Indicative](/materials/ks/sm490a "JIS SM490A") - **SM490B Indicative** - [SM490C Indicative](/materials/ks/sm490c "JIS SM490C") - [SM490YA Indicative](/materials/jis/sm490ya "JIS SM490YA") - [SM490YB Indicative](/materials/ks/sm490yb "JIS SM490YB") - [STK490 Indicative](/materials/jis/stk490 "JIS STK490") GB China · 1 - [20 Indicative](/materials/bds/20 "GB 20") GOST Russia / CIS · 2 - [15GF Indicative](/materials/gost/15gf "GOST 15GF") - [15ГФ Indicative](/materials/gost/15gf "GOST 15ГФ") UNI Italy · 3 - [FeE355KG Indicative](/materials/uni/fee355kg "UNI FeE355KG") - [FeE355KKW Indicative](/materials/uni/fee355kkw "UNI FeE355KKW") - [P355N Indicative](/materials/din-en/p355n "UNI P355N") SS Sweden · 2 - [2106 Indicative](/materials/ss/2106 "SS 2106") - [2132 Indicative](/materials/ss/2132 "SS 2132") PN Poland · 1 - [18G2A Indicative](/materials/pn/18g2a "PN 18G2A") MSZ Hungary · 1 - [52D Indicative](/materials/msz/52d "MSZ 52D") STAS Romania · 1 - [OCS355.5a Indicative](/materials/stas/ocs355-5a "STAS OCS355.5a") BDS Bulgaria · 2 - [10G2SBSBB Indicative](/materials/bds/10g2sbsbb "BDS 10G2SBSBB") - [10G2SFTSFT Indicative](/materials/bds/10g2sftsft "BDS 10G2SFTSFT") SFS Finland · 3 - [Fe355DP Indicative](/materials/sfs/fe355dp "SFS Fe355DP") - [RAEX355N Indicative](/materials/sfs/raex355n "SFS RAEX355N") - [RAEX384P Indicative](/materials/sfs/raex384p "SFS RAEX384P") KS South Korea · 1 - **SM490B This grade’s own name** 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 Si Ni Iron — the balance, never listed by a standard — 96.5 % Mn — 1.4 % Si — 0.5 % Ni — 0.5 % Traces & impurities · 1.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.18 | | Si | ≤ 0.5 | | Mn | 1.1–1.7 | | P | 0.025 | | S | 0.015 | | Cr | ≤ 0.3 | | Mo | ≤ 0.08 | | Ni | ≤ 0.5 | | V | ≤ 0.1 | | Cu | ≤ 0.3 | | Al | ≥ 0.02 | | Ti | ≤ 0.03 | | Nb | ≤ 0.05 | | N | 0.012 | 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 | ≤0,18 | — | 0.180 | Max | | N | 0,012 | 0.012 | 0.012 | Exact | | Al | ≥0,020 | 0.020 | — | Min | | Si | ≤0,50 | — | 0.500 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Ti | ≤0,03 | — | 0.030 | Max | | V | ≤0,10 | — | 0.100 | Max | | Cr | ≤0,30 | — | 0.300 | Max | | Mn | 1,10-1,70 | 1.100 | 1.700 | Range | | Ni | ≤0,50 | — | 0.500 | Max | | Cu | ≤0,30 | — | 0.300 | Max | | Nb | ≤0,05 | — | 0.050 | Max | | Mo | ≤0,08 | — | 0.080 | Max | - (Nb+Ti+V) ≤ 0,12 - (Nb+Ti+V) ≤ 0,12 - (Nb+Ti+V) ≤ 0,12 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 811 °C Predicted Ae1 710 °C Predicted Acm 421 °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 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 2 conditions · 15 values By thickness**Normalized** source `steelnumber` | Thickness mm | ReH N/mm² | Rm N/mm² | A% | |---|---|---|---| | ≤ 16 | 355 | — | — | | 16 – 40 | 345 | — | — | | 40 – 60 | 335 | — | — | | ≤ 60 | — | 490 – 630 | 22 | | 60 – 100 | 315 | 470 – 610 | — | | 60 – 250 | — | — | 21 | | 100 – 150 | 305 | 460 – 600 | — | | 150 – 250 | 295 | 450 – 590 | — | By delivery state**no delivery state stated** source `steeljis` | Delivery state | Rm N/mm² | Re N/mm² | A% | |---|---|---|---| | Hot-rolled | 490 – 610 | 275 – 325 | 17 – 23 | 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. ## Heat treatment Supply condition - Normalizing t≤16 Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied. Source: [www.caishuku.com](https://www.caishuku.com/detail/azhlNWIxMTQyMTQ_ "Source: www.caishuku.com") ## 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. [P355NH 1.0565 Mn 1,10-1,70 · Si ≤0,50 - ΔMn 0.00 - ΔSi 0.00 - 18 designations](/materials/din-en/p355nh "P355NH")[1.0566 1.0566 Mn 1,10-1,70 · Si ≤0,50 - ΔMn 0.00 - ΔSi 0.00 - 29 designations](/materials/material-no/1.0566 "1.0566")[S355NH 1.0539 Mn 0,90-1,65 · Si ≤0,50 - ΔMn 0.13 - ΔSi 0.00 - 7 designations](/materials/din-en/s355nh "S355NH")[S355NH 1.0545 Mn 0,90-1,65 · Si ≤0,50 - ΔMn 0.13 - ΔSi 0.00 - 16 designations](/materials/din-en/s355nh "S355NH")[A633Gr.D 1.0546 Mn 0,90-1,65 · Si ≤0,50 - ΔMn 0.13 - ΔSi 0.00 - 15 designations](/materials/din-en/a633gr-d "A633Gr.D")[P305GH 1.0436 Mn 0,90-1,60 · Si ≤0,40 - ΔMn 0.15 - ΔSi 0.05 - 38 designations](/materials/din-en/p305gh "P305GH") ## 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=aac68d21-d946-48a8-a9cb-cbe7dcfe0ef9&designation=09301b78-befe-468b-8f5b-4887eb21cef7 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/sm490b.pdf "Datasheet as PDF")