Steel S275N-N (Normalized)
Heat-treated state · default condition
EN S275N
Standard stocked condition for welded structures needing guaranteed toughness down to -20 °C.
Values for the N condition
Other S275N tempers and conditions
S275N is listed in 3 conditions; see the grade overview at S275N.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
N heavy section | Use when specifying thick normalized plate; minimum yield falls with thickness per EN 10025-3. | 245 | 420 | 26 | 128 HB | 10.5 % IACS |
NDefaultThis page Normalized | Standard stocked condition for welded structures needing guaranteed toughness down to -20 °C. | 300 | 450 | 27 | 135 HB | 10.5 % IACS |
Normalized, low-temperature quality | Pick for cryogenic-ambient or arctic service and for pressure equipment requiring impact testing at -50 °C. | 300 | 450 | 28 | 132 HB | 10.5 % IACS |
What is S275N-N?
S275N-N is S275N heat treated to N — standard stocked condition for welded structures needing guaranteed toughness down to -20 °C. S275N-N has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 86% of steel grades. Elongation at break is 27% and the elastic modulus is 210 GPa (30.5 Msi). S275N-N 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).
Advantages
- Readily welded — 92/100, better than 93% of steel grades
- High electrical conductivity — 10.5 % IACS, better than 89% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
- Ductile — tolerates forming and impact — 27%, better than 86% of steel grades
- Forms and bends easily — 70/100, better than 86% of steel grades
Limitations
- Low strength — 300 MPa (43.5 ksi), worse than 86% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
S275N-N properties
Typical room-temperature values for S275N-N; 22 are specific to this condition. Other listed values are S275N reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
S275N-N 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).
Mechanical16
S275N-N has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 86% of steel grades. Elongation at break is 27% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
S275N-N is rated for continuous service to 400°C (752 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
S275N-N conducts electricity at 10.5 % IACS, better than 89% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of S275N-N takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
S275N-N's machinability is good (62/100, better than 89% of steel grades); weldability excellent (92/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S275N-N
Is S275N easy to machine?
Machines like normalized C-Mn steel (~70 % of AISI 1212); use sharp HSS/carbide, moderate speeds and good chip breaking as gummy ferrite can smear.
Can S275N be welded?
Excellent weldability by SMAW/GMAW/SAW with matching C-Mn filler; CEV ≤0.40 means little or no preheat for t≤30 mm, keep heat input controlled to preserve normalized fine grain.
Can S275N be formed, bent or molded?
Cold bends readily to ~2–3 t bend radius with grain-favourable orientation; hot forming above 900 °C should be followed by re-normalizing to restore properties.
What surface finishes work on S275N?
Not anodizable — protect by shot blast plus paint, metallizing or hot-dip galvanizing (low Si keeps galvanized coating well behaved).
S275N 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.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Ct ≤ 63 mm | ≤ 0.18 | 0.15 |
| Si | ≤ 0.4 | 0.25 |
| Mn | 0.5 – 1.4 | 1.1 |
| PS275NL ≤0.025 | ≤ 0.03 | 0.02 |
| SS275NL ≤0.020 | ≤ 0.03 | 0.01 |
| Nlimit may be exceeded if sufficient N-binding elements present | ≤ 0.02 | 0.01 |
| Altotal Al; alternative N-binding elements permitted | ≥ 0.02 | 0.03 |
| Cr | ≤ 0.3 | 0.05 |
| Cu | ≤ 0.35 | 0.1 |
| Ni | ≤ 0.5 | 0.1 |
| Mo | ≤ 0.08 | 0.01 |
| NbNb+Ti+V ≤ 0.05 combined per EN 10025-3 | ≤ 0.05 | 0.02 |
| Ti | ≤ 0.05 | 0.01 |
| V | ≤ 0.05 | 0.01 |
| FeCEV ≤ 0.40 for t ≤ 63 mm | balance | — |
S275N-N — frequently asked
What is S275N-N used for?
S275N-N is typically used for bridges, steel structures, offshore platforms and welded fabrications. In short: normalized structural workhorse; weldability rating 92; fine grain, better toughness.
What is the yield strength of S275N-N?
S275N-N has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 86% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is S275N-N easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Machines like normalized C-Mn steel (~70 % of AISI 1212); use sharp HSS/carbide, moderate speeds and good chip breaking as gummy ferrite can smear.
Can S275N-N be welded?
Yes — weldability is rated excellent (92/100). Excellent weldability by SMAW/GMAW/SAW with matching C-Mn filler; CEV ≤0.40 means little or no preheat for t≤30 mm, keep heat input controlled to preserve normalized fine grain.
What surface finishes work on S275N-N?
Not anodizable — protect by shot blast plus paint, metallizing or hot-dip galvanizing (low Si keeps galvanized coating well behaved).
Can S275N-N be formed, bent or molded?
Cold bends readily to ~2–3 t bend radius with grain-favourable orientation; hot forming above 900 °C should be followed by re-normalizing to restore properties.
What is the maximum service temperature of S275N-N?
S275N-N is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S275N-N and S275N N-HEAVY?
N is the default condition — standard stocked condition for welded structures needing guaranteed toughness down to -20 °C. N-HEAVY: use when specifying thick normalized plate; minimum yield falls with thickness per EN 10025-3. Yield strength is 300 MPa in N versus 245 MPa in N-HEAVY.
Sources
- EN 10025-3: Hot rolled products of structural steels — Normalized/normalized rolled weldable fine grain structural steels — CEN (2019)
- EN 10027-2 / material number 1.0490 — CEN (2015)
- EN 1993-1-1 Eurocode 3 — design of steel structures (physical constants) — CEN (2005)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19: Fatigue and Fracture — ASM International (1996)
- Normalized fine-grain structural plate datasheets (S275N/S275NL) — European plate mills (2022)
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.