Steel E355M M+SR
Heat-treated state
EN 1.8896
Ordered for precision-machined or heavily welded parts where distortion must be minimised; hold below ~560 °C to preserve TMCP strength.
Values for the M+SR condition
Other E355M tempers and conditions
E355M is listed in 5 conditions; see the grade overview at E355M.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+M | Heavy plate condition for thick welded frames; lowest guaranteed yield of the +M family. | 370 | 500 | 25 | 155 HB | 9 % IACS |
+M | Medium-thickness plate: yield guarantee steps down to 345 MPa while toughness and weldability stay unchanged. | 385 | 510 | 26 | 158 HB | 9 % IACS |
M+SRThis page thermomechanically rolled and stress relieved | Ordered for precision-machined or heavily welded parts where distortion must be minimised; hold below ~560 °C to preserve TMCP strength. | 385 | 505 | 27 | 155 HB | 9 % IACS |
MDefault Thermomechanically controlled processed | Standard stocked condition: TMCP fine-grain plate/section/tube with 355 MPa minimum yield and −20 °C impact guarantee. | 400 | 520 | 26 | 160 HB | 9 % IACS |
thermomechanically rolled, low-temperature toughness (−50 °C) | Choose when service or test temperature reaches −50 °C (cold-climate machinery, offshore, cranes); tighter P/S limits. | 400 | 520 | 27 | 160 HB | 9 % IACS |
What is E355M M+SR?
E355M M+SR is E355M heat treated to M+SR — ordered for precision-machined or heavily welded parts where distortion must be minimised; hold below ~560 °C to preserve TMCP strength. E355M M+SR has a yield strength of 385 MPa (55.8 ksi) and a tensile strength of 505 MPa (73.2 ksi) — weaker than 65% of steel grades. Elongation at break is 27% and the elastic modulus is 210 GPa (30.5 Msi). E355M M+SR 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). M is the default condition FabDigit quotes; M+SR is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 155 MPa·√m (141.1 ksi·√in), better than 97% of steel grades
- Forms and bends easily — 73/100, better than 89% of steel grades
- Readily welded — 88/100, better than 87% of steel grades
- Ductile — tolerates forming and impact — 27%, better than 86% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
E355M M+SR properties
Typical room-temperature values for E355M M+SR; 22 are specific to this condition. Other listed values are E355M reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
E355M M+SR 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
E355M M+SR has a yield strength of 385 MPa (55.8 ksi) and a tensile strength of 505 MPa (73.2 ksi) — weaker than 65% of steel grades. Elongation at break is 27% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
E355M M+SR is rated for continuous service to 400°C (752 °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
E355M M+SR 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 E355M M+SR takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability8
E355M M+SR's machinability is good (57/100, better than 71% of steel grades); weldability excellent (88/100); formability very good (73/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E355M M+SR
Is E355M easy to machine?
Machines like a tough medium-strength C-Mn steel — use sharp coated carbide, moderate speeds and positive rake; stringy chips due to low sulphur, so chip breakers and good coolant flow help.
Can E355M be welded?
Excellent weldability with CEV ≤ 0.39: MAG/SAW/stick with basic low-hydrogen consumables, little or no preheat for thin sections, and controlled heat input (typically ≤ 3.5 kJ/mm) to protect the TMCP-refined HAZ toughness.
Can E355M be formed, bent or molded?
Good cold formability; bend transverse to rolling direction with inner radius ≈ 1.5–2 t for thin plate, and avoid hot forming or normalising above ~580 °C, which erases the thermomechanical strengthening.
What surface finishes work on E355M?
Not anodisable — protect by shot blasting plus primer/paint, hot-dip galvanising (low Si keeps coating thickness uniform) or zinc-rich duplex systems; the clean fine-grain surface takes powder coating well.
E355M 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 |
|---|---|---|
| Clow C for weldability; CEV ≤ 0.39 | ≤ 0.16 | 0.12 |
| Si | ≤ 0.5 | 0.25 |
| Mn | ≤ 1.6 | 1.4 |
| P≤0.025 for +ML | ≤ 0.03 | 0.02 |
| S≤0.020 for +ML | ≤ 0.03 | 0.01 |
| Nbmicroalloy grain refiner | ≤ 0.05 | 0.03 |
| V | ≤ 0.1 | 0.03 |
| TiNb+V+Ti ≤ 0.22 total | ≤ 0.05 | 0.02 |
| Altotal Al, grain refinement / N binding | ≥ 0.02 | 0.04 |
| Cr | ≤ 0.3 | 0.05 |
| Ni | ≤ 0.5 | 0.1 |
| Mo | ≤ 0.1 | 0.02 |
| Cu | ≤ 0.55 | 0.15 |
| N | ≤ 0.02 | 0.01 |
| Fe | balance | — |
E355M M+SR — frequently asked
What is E355M M+SR used for?
E355M M+SR is typically used for machine components, structural frames, welded fabrications and mechanical parts. In short: balanced strength and weldability; TMCP fine-grain 355 class; good cold formability.
What is the yield strength of E355M M+SR?
E355M M+SR has a typical yield strength of 385 MPa (55.8 ksi) and a tensile strength of 505 MPa (73.2 ksi) — weaker than 65% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is E355M M+SR easy to machine?
Reasonably — machinability is rated good (57/100, better than 71% of steel grades). Machines like a tough medium-strength C-Mn steel — use sharp coated carbide, moderate speeds and positive rake; stringy chips due to low sulphur, so chip breakers and good coolant flow help.
Can E355M M+SR be welded?
Yes — weldability is rated excellent (88/100). Excellent weldability with CEV ≤ 0.39: MAG/SAW/stick with basic low-hydrogen consumables, little or no preheat for thin sections, and controlled heat input (typically ≤ 3.5 kJ/mm) to protect the TMCP-refined HAZ toughness.
What surface finishes work on E355M M+SR?
Not anodisable — protect by shot blasting plus primer/paint, hot-dip galvanising (low Si keeps coating thickness uniform) or zinc-rich duplex systems; the clean fine-grain surface takes powder coating well.
Can E355M M+SR be formed, bent or molded?
Good cold formability; bend transverse to rolling direction with inner radius ≈ 1.5–2 t for thin plate, and avoid hot forming or normalising above ~580 °C, which erases the thermomechanical strengthening.
What is the maximum service temperature of E355M M+SR?
E355M M+SR 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 E355M-M and E355M M-40-63?
M is the default condition — standard stocked condition: TMCP fine-grain plate/section/tube with 355 MPa minimum yield and −20 °C impact guarantee. M-40-63: heavy plate condition for thick welded frames; lowest guaranteed yield of the +M family. Yield strength is 400 MPa in M versus 370 MPa in M-40-63.
Sources
- EN 10025-4 — Hot rolled products of structural steels, Part 4: Thermomechanical rolled weldable fine grain structural steels — CEN (2019)
- EN 10297-1 / EN 10305-1 — Seamless steel tubes for mechanical and general engineering purposes (E355 family) — CEN (2016)
- EN 10027-2 — Designation systems for steels: numerical system (material numbers) — CEN (2015)
- GB/T 1591 — (Q355ME comparable grade) — SAC (2018)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- EN 1011-2 — Welding: recommendations for welding of ferritic steels — CEN (2001)
- Thermomechanically rolled fine-grain structural steel S355M/ML data sheets — European plate mills (SSAB/Dillinger/voestalpine) (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.