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Steel S355K2 +N-63-100 (+N)

Grade

EN S355K2

Thick normalized plate for heavy nodes and offshore sections; yield minimum 315–325 MPa.

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Values for the +N-63-100 condition

Other S355K2 tempers and conditions

S355K2 is listed in 6 conditions; see the grade overview at S355K2.

Compare all 6 conditionsHide
Condition · open for datasheetBest forYield MPaTensile MPaElong. %HardnessConductivity
+N-100-150
+N
Very heavy normalized plate; reduced strength band (Rm 450–600 MPa) and lowest through-thickness toughness.34050023146 HB10 % IACS
+N-63-100This page
+N
Thick normalized plate for heavy nodes and offshore sections; yield minimum 315–325 MPa.36051524150 HB10 % IACS
+N-40-63
+N
Heavy plate band; yield minimum 335 MPa, slightly lower elongation requirement.37552525153 HB10 % IACS
+N-16-40
+N
Medium plate thickness band; yield minimum steps down to 345 MPa.38553526157 HB10 % IACS
+AR
Hot rolled
Cheapest delivery condition, allowed by EN 10025-2 for K2 quality in thinner products where −20 °C impacts are still met.39555025163 HB—
+NDefault
Normalized
Standard stocked condition: normalized fine-grain plate/section with full −20 °C toughness and best weldability.40054526160 HB—

What is S355K2 +N-63-100?

S355K2 +N-63-100 is S355K2 in the +N-63-100 grade — thick normalized plate for heavy nodes and offshore sections; yield minimum 315–325 MPa. S355K2 +N-63-100 has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 515 MPa (74.7 ksi) — weaker than 72% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi). S355K2 +N-63-100 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). +N is the default condition FabDigit quotes; +N-63-100 is available on request or by drawing note.

Advantages

  • Readily welded — 86/100, better than 85% of steel grades
  • High electrical conductivity — 10 % IACS, better than 83% of steel grades
  • Forms and bends easily — 61/100, better than 77% of steel grades

Limitations

  • Hard to polish — 40/100, worse than 96% of steel grades

S355K2 +N-63-100 properties

Typical room-temperature values for S355K2 +N-63-100; 22 are specific to this condition. Other listed values are S355K2 reference data and may not represent this condition. Bars are the position among steel grades.

Physical3

S355K2 +N-63-100 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).

Density7.85 g/cm³0.28 lb/in³
Melting Point (Solidus)1,425°C2,597 °F
Liquidus Temperature1,510°C2,750 °F

Mechanical16

S355K2 +N-63-100 has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 515 MPa (74.7 ksi) — weaker than 72% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).

Elastic (Young's) Modulus210 GPa30.5 Msi
Shear Modulus81 GPa11.7 Msi
Bulk Modulus160 GPa23.2 Msi
Poisson's Ratio0.3
Tensile Strength (Ultimate)515 MPa74.7 ksi
Yield Strength (0.2% offset)360 MPa52.2 ksi
Elongation at Break24%
Reduction in Area52%
Compressive Strength360 MPa52.2 ksi
Shear Strength310 MPa45 ksi
Fatigue Strength (Endurance Limit)230 MPa33.4 ksi
Fracture Toughness (K_IC)100 MPa·√m91 ksi·√in
Charpy V-Notch Impact (RT)100 J73.8 ft·lbf
Hardness, Brinell150 HB
Hardness, Rockwell B80 HRB
Hardness, Vickers157 HV

Thermal6

S355K2 +N-63-100 is rated for continuous service to 350°C (662 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 66% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).

Thermal Conductivity45 W/m·K26 BTU/hr·ft·°F
Specific Heat Capacity460 J/kg·K0.11 BTU/lb·°F
Thermal Expansion (CTE, 20–100 °C)12 µm/m·K6.7 µin/in·°F
Latent Heat of Fusion270 J/g116 BTU/lb
Max Service Temperature (continuous)350°C662 °F
Min Service Temperature-20°C-4 °F

Electrical3

S355K2 +N-63-100 conducts electricity at 10 % IACS, better than 83% of steel grades.

Electrical Conductivity10 % IACS
Electrical Resistivity1.7×10⁻⁷ Ω·m6.69 µΩ·in
Magnetic Responseferromagnetic

Chemical & Environmental3

Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.

Galvanic Potential (seawater, vs SCE)-0.65 V
Corrosion ResistanceNot recommended10/100
Chemical Resistance SummaryRusts freely in humid, marine or de-icing-salt environments; resists dry gases, hydrocarbons and alkalis but is attacked by acids and chlorides — always specify paint, hot-dip galvanizing or metallizing.

Sustainability4

Producing a kilogram of S355K2 +N-63-100 takes about 26 MJ of energy and emits 2.1 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 25%.

Embodied Energy (primary production)26 MJ/kg11,178 BTU/lb
Embodied Carbon (primary production)2.1 kg CO₂/kg
Embodied Water45 L/kg5.4 gal/lb
Typical Recycled Content25%

Manufacturability7

S355K2 +N-63-100's machinability is good (58/100, better than 75% of steel grades); weldability excellent (86/100); formability good (61/100).

MachinabilityGood58/100
Machinability Rating (AISI 1212 = 100 %)63%
WeldabilityExcellent86/100
Formability (cold)Good61/100
Brazeability / SolderabilityGood60/100
PolishabilityFair40/100
Anodizing Responsen/a — ferrous alloy cannot be anodized; use zinc-rich primer + paint, hot-dip galvanizing or thermal-spray aluminium

Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.

Working with S355K2 +N-63-100

Is S355K2 easy to machine?

Machines like ordinary C-Mn steel at ~60 % of AISI 1212; use rigid setups, moderate speeds and positive-rake carbide, expect stringy chips from low-sulphur heats.

Can S355K2 be welded?

Excellent weldability by SMAW/GMAW/SAW with CEV ≈0.43; use low-hydrogen consumables and preheat 75–150 °C for thick sections or high restraint per EN 1011-2.

Can S355K2 be formed, bent or molded?

Cold bends readily at 2t–3t inside radius transverse to rolling for t ≤ 16 mm; hot form at 900–1050 °C and re-normalize if formed below 750 °C.

What surface finishes work on S355K2?

Cannot be anodized — protect by blast cleaning to Sa 2½ plus zinc-rich epoxy paint systems (ISO 12944), hot-dip galvanizing (watch Si content for coating thickness) or thermal-spray metallizing.

S355K2 chemical composition (wt %)

Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.

ElementSpec limit (wt %)Nominal
C≤0.20 % for t ≤ 30 mm; up to 0.22 % in thicker product (ladle analysis)≤ 0.20.17
Si≤ 0.550.25
Mn≤ 1.61.4
P≤ 0.030.02
S≤0.015 % typical for Z-quality plate≤ 0.030.01
NLimit waived if sufficient N-binding elements (Al, Nb, V, Ti) are present≤ 0.010.01
Cu≤ 0.550.2
AlTotal Al for fine-grain / killed practice≥ 0.020.03
Nb+V+TiMicro-alloying, sum limited; Nb ≤0.05, V ≤0.12, Ti ≤0.05≤ 0.220.03
CEVCarbon equivalent (IIW), t ≤ 30 mm; up to 0.49 for heavy plate≤ 0.470.43
Febalance—

S355K2 +N-63-100 — frequently asked

What is S355K2 +N-63-100 used for?

S355K2 +N-63-100 is typically used for bridges, heavy machinery frames, cranes, structural steelwork and pressure-loaded structures. In short: best-welding S355 variant; −20 °C notch toughness; widely cross-referenced structural grade.

What is the yield strength of S355K2 +N-63-100?

S355K2 +N-63-100 has a typical yield strength of 360 MPa (52.2 ksi) and a tensile strength of 515 MPa (74.7 ksi) — weaker than 72% of steel grades. Strength varies by condition: see the 6 listed tempers.

Is S355K2 +N-63-100 easy to machine?

Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines like ordinary C-Mn steel at ~60 % of AISI 1212; use rigid setups, moderate speeds and positive-rake carbide, expect stringy chips from low-sulphur heats.

Can S355K2 +N-63-100 be welded?

Yes — weldability is rated excellent (86/100). Excellent weldability by SMAW/GMAW/SAW with CEV ≈0.43; use low-hydrogen consumables and preheat 75–150 °C for thick sections or high restraint per EN 1011-2.

What surface finishes work on S355K2 +N-63-100?

Cannot be anodized — protect by blast cleaning to Sa 2½ plus zinc-rich epoxy paint systems (ISO 12944), hot-dip galvanizing (watch Si content for coating thickness) or thermal-spray metallizing.

Can S355K2 +N-63-100 be formed, bent or molded?

Cold bends readily at 2t–3t inside radius transverse to rolling for t ≤ 16 mm; hot form at 900–1050 °C and re-normalize if formed below 750 °C.

What is the maximum service temperature of S355K2 +N-63-100?

S355K2 +N-63-100 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.

Sources

  1. EN 10025-2 Hot rolled products of structural steels — Non-alloy structural steels — CEN (2019)
  2. EN 10164 Steel products with improved deformation properties perpendicular to the surface — CEN (2018)
  3. ASTM A572/A572M Grade 50 High-Strength Low-Alloy Columbium-Vanadium Structural Steel — ASTM (2021)
  4. EN 1993-1-1 / EN 1993-1-2 Eurocode 3 design of steel structures (physical properties) — CEN (2005)
  5. ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
  6. EN 1011-2 Welding — Recommendations for arc welding of ferritic steels — CEN (2001)
  7. Structural steel plate S355K2+N datasheet — European plate mills (e.g. Dillinger / ArcelorMittal) (2023)

Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.