Steel S275M
EN S275M
S275M (1.8818) is a thermomechanically rolled fine-grain structural steel with 275 MPa minimum yield strength, offering better notch toughness and weldability than normalized S275N at the same strength class.
Reference datasheet — S275M is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the M condition
S275M tempers and conditions
S275M is supplied in 5 conditions, soft to hard. M is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M | Heavy TMCP plate for thick welded sections; lowest guaranteed yield of the grade. | 280 | 425 | 27 | 135 HB | 9 % IACS |
M | Medium-thickness TMCP plate; yield minimum drops to 265 MPa with thickness. | 290 | 430 | 28 | 138 HB | 9 % IACS |
MDefault Thermomechanically controlled processed | Standard stocked TMCP plate/section for welded structures with service down to −20 °C. | 300 | 440 | 28 | 140 HB | 9 % IACS |
Thermomechanically rolled, low-temperature quality | Choose when 27 J Charpy at −50 °C is required (cold-climate bridges, offshore topsides). | 305 | 445 | 29 | 142 HB | 9 % IACS |
Cold formed / cold worked TMCP section | Cold-bent hollow sections and formed profiles; strength rises and ductility/toughness fall at the bend. | 360 | 470 | 20 | 155 HB | 9 % IACS |
What is S275M?
S275M (1.8818) is a thermomechanically rolled fine-grain structural steel with 275 MPa minimum yield strength, offering better notch toughness and weldability than normalized S275N at the same strength class. Plate and sections in M, ML and cold-formed conditions typically show 300 MPa yield, 440 MPa tensile, 28 % elongation and about 140 HB, with a weldability score of 92. The low carbon equivalent that makes it easy to weld also limits hot working: heating above roughly 580 °C destroys the TMCP microstructure and the guaranteed properties. S355M is the usual step up when higher strength is needed. S275M has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F). S275M has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 86% of steel grades. Elongation at break is 28% and the elastic modulus is 210 GPa (30.5 Msi).
What is S275M used for?
- Structural steel plate
- Bridges
- Offshore platforms
- Welded steel frames
Advantages
- Readily welded — 92/100, better than 93% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- Forms and bends easily — 78/100, better than 91% of steel grades
- Ductile — tolerates forming and impact — 28%, better than 89% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% 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
S275M properties
Typical room-temperature values for S275M-M; bars are the position among steel grades.
Physical3
S275M has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical16
S275M has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 86% of steel grades. Elongation at break is 28% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
S275M 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).
Electrical3
S275M conducts electricity at 9 % IACS, better than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of S275M takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability8
S275M's machinability is good (62/100, better than 89% of steel grades); weldability excellent (92/100); formability very good (78/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. S275M is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S275M
Is S275M easy to machine?
Machines like a soft HSLA steel — low sulphur makes it gummy, so use sharp positive-rake tooling, high feed and generous coolant to avoid built-up edge.
Can S275M be welded?
Excellent weldability by SMAW/GMAW/SAW with low-hydrogen consumables; low CEV means little or no preheat for thin sections, but keep heat input controlled (typically ≤ 3.5 kJ/mm) so TMCP HAZ toughness is preserved.
Can S275M be formed, bent or molded?
Cold forms and bends readily (min bend radius ~1–2 t depending on thickness/orientation); avoid hot forming or normalising above ~580 °C, which destroys the thermomechanical microstructure and the guaranteed properties.
S275M 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 |
|---|---|---|
| CEN 10025-4, all thicknesses | ≤ 0.13 | 0.09 |
| Si | ≤ 0.5 | 0.25 |
| Mn | ≤ 1.5 | 1.2 |
| P0.025 max for ML quality | ≤ 0.03 | 0.02 |
| S0.020 max for ML quality | ≤ 0.03 | 0.01 |
| Altotal Al; may be replaced by other N-binding elements | ≥ 0.02 | 0.04 |
| Nb | ≤ 0.05 | 0.03 |
| V | ≤ 0.08 | 0.02 |
| TiNb+V+Ti ≤ 0.12 total | ≤ 0.05 | 0.02 |
| Cr | ≤ 0.3 | 0.05 |
| Ni | ≤ 0.3 | 0.05 |
| Mo | ≤ 0.1 | 0.02 |
| Cu | ≤ 0.55 | 0.1 |
| N | ≤ 0.03 | 0.01 |
| FeCEV ≤ 0.34 for t ≤ 16 mm, ≤ 0.35 for t > 16 mm | balance |
What surface finishes work on S275M?
Requires protection: shot-blast to Sa 2½ then paint per ISO 12944, or hot-dip galvanise per ISO 1461 (silicon and phosphorus levels are low enough for normal coating growth).
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel S275M in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.8818
How much does S275M cost?
S275M is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
S275M — frequently asked
What is S275M used for?
S275M is typically used for structural steel plate, bridges, offshore platforms and welded steel frames. In short: highly weldable TMCP steel; good low-temperature toughness; no hot forming above 580 °C.
What is the yield strength of S275M?
S275M has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 86% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is S275M easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Machines like a soft HSLA steel — low sulphur makes it gummy, so use sharp positive-rake tooling, high feed and generous coolant to avoid built-up edge.
Can S275M be welded?
Yes — weldability is rated excellent (92/100). Excellent weldability by SMAW/GMAW/SAW with low-hydrogen consumables; low CEV means little or no preheat for thin sections, but keep heat input controlled (typically ≤ 3.5 kJ/mm) so TMCP HAZ toughness is preserved.
What surface finishes work on S275M?
Requires protection: shot-blast to Sa 2½ then paint per ISO 12944, or hot-dip galvanise per ISO 1461 (silicon and phosphorus levels are low enough for normal coating growth).
Can S275M be formed, bent or molded?
Cold forms and bends readily (min bend radius ~1–2 t depending on thickness/orientation); avoid hot forming or normalising above ~580 °C, which destroys the thermomechanical microstructure and the guaranteed properties.
What is the maximum service temperature of S275M?
S275M 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.
What is the difference between S275M-M and S275M M-40-63?
M is the default condition — standard stocked TMCP plate/section for welded structures with service down to −20 °C. M-40-63: heavy TMCP plate for thick welded sections; lowest guaranteed yield of the grade. Yield strength is 300 MPa in M versus 280 MPa in M-40-63.
How much does S275M cost?
S275M is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 10025-4 — Hot rolled products of structural steels, Part 4: Thermomechanical rolled weldable fine grain structural steels — CEN (2019)
- EN 10025-1 — General technical delivery conditions — CEN (2004)
- EN 1993-1-1 Eurocode 3 — Design of steel structures — CEN (2005)
- EN 1011-2 — Welding of ferritic steels — CEN (2001)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13 — Corrosion — ASM International (2005)
- TMCP structural plate datasheets (Dillinger / SSAB / voestalpine) — various mills (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.