Steel S355MC-SR (Stress relieved)
Heat-treated state
EN S355MC
Used after heavy welding or cold forming of thick sections to reduce residual stress and distortion; small strength loss.
Values for the SR condition
Other S355MC tempers and conditions
S355MC is listed in 5 conditions; see the grade overview at S355MC.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SRThis page Stress relieved | Used after heavy welding or cold forming of thick sections to reduce residual stress and distortion; small strength loss. | 375 | 470 | 28 | 145 HB | 9 % IACS |
MDefault Thermomechanically controlled processed | Standard stocked condition for hot rolled coil, sheet and plate used in cold-formed structural and vehicle parts. | 400 | 490 | 26 | 150 HB | 9 % IACS |
M pickled and oiled | Choose when clean surface is needed for direct stamping, welding or painting without shot blasting. | 400 | 490 | 26 | 150 HB | 9 % IACS |
M slit / temper-levelled strip | Levelled narrow strip for roll forming and progressive-die work where flatness and camber control matter; slight yield increase from levelling. | 420 | 500 | 24 | 155 HB | 9 % IACS |
M cold formed / roll formed | Property state of the finished cold-formed profile: strength raised and ductility lowered locally at bends. | 480 | 540 | 15 | 175 HB | 9 % IACS |
What is S355MC-SR?
S355MC-SR is S355MC heat treated to SR — used after heavy welding or cold forming of thick sections to reduce residual stress and distortion; small strength loss. S355MC-SR has a yield strength of 375 MPa (54.4 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 70% of steel grades. Elongation at break is 28% and the elastic modulus is 210 GPa (30.5 Msi). S355MC-SR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,470°C (2,678 °F). M is the default condition FabDigit quotes; SR is available on request or by drawing note.
Advantages
- Forms and bends easily — 84/100, better than 94% of steel grades
- Readily welded — 92/100, better than 93% of steel grades
- Ductile — tolerates forming and impact — 28%, better than 89% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
S355MC-SR properties
Typical room-temperature values for S355MC-SR; 22 are specific to this condition. Other listed values are S355MC reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
S355MC-SR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,470°C (2,678 °F).
Mechanical16
S355MC-SR has a yield strength of 375 MPa (54.4 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 70% of steel grades. Elongation at break is 28% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
S355MC-SR 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
S355MC-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 S355MC-SR takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
S355MC-SR's machinability is good (62/100, better than 89% of steel grades); weldability excellent (92/100); formability very good (84/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S355MC-SR
Is S355MC easy to machine?
Machines like low-carbon HSLA sheet — sharp positive-rake tools and generous coolant to avoid gummy chips and burrs; deburr laser/plasma cut edges before forming.
Can S355MC be welded?
Excellent weldability with low CEV; MAG, SAW, laser and resistance welding all suitable, typically no preheat below ~25 mm, use low-hydrogen consumables and control heat input to preserve HAZ toughness.
Can S355MC be formed, bent or molded?
Designed for cold forming: bend transverse to rolling direction where possible, minimum inside radius roughly 1.0–1.5× thickness, and allow for springback of the high-yield sheet.
What surface finishes work on S355MC?
Not corrosion resistant — pickle or blast off mill scale, then phosphate + e-coat, powder paint, or hot-dip galvanize; oil coating for interim storage.
S355MC 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 10149-2 ladle analysis | ≤ 0.12 | 0.08 |
| Si | ≤ 0.5 | 0.15 |
| Mn | ≤ 1.5 | 1.2 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Altotal Al, minimum | ≥ 0.02 | 0.04 |
| Nbmicro-alloying | ≤ 0.09 | 0.04 |
| Vmicro-alloying | ≤ 0.2 | 0.03 |
| Timicro-alloying | ≤ 0.15 | 0.02 |
| Fe | balance | — |
S355MC-SR — frequently asked
What is S355MC-SR used for?
S355MC-SR is typically used for cold-formed structural parts, wheel rims and crane components. In short: best-forming micro-alloyed sheet; highest weldability in family; entry-level MC strength.
What is the yield strength of S355MC-SR?
S355MC-SR has a typical yield strength of 375 MPa (54.4 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 70% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is S355MC-SR easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Machines like low-carbon HSLA sheet — sharp positive-rake tools and generous coolant to avoid gummy chips and burrs; deburr laser/plasma cut edges before forming.
Can S355MC-SR be welded?
Yes — weldability is rated excellent (92/100). Excellent weldability with low CEV; MAG, SAW, laser and resistance welding all suitable, typically no preheat below ~25 mm, use low-hydrogen consumables and control heat input to preserve HAZ toughness.
What surface finishes work on S355MC-SR?
Not corrosion resistant — pickle or blast off mill scale, then phosphate + e-coat, powder paint, or hot-dip galvanize; oil coating for interim storage.
Can S355MC-SR be formed, bent or molded?
Designed for cold forming: bend transverse to rolling direction where possible, minimum inside radius roughly 1.0–1.5× thickness, and allow for springback of the high-yield sheet.
What is the maximum service temperature of S355MC-SR?
S355MC-SR 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 S355MC-M and S355MC M-CF?
M is the default condition — standard stocked condition for hot rolled coil, sheet and plate used in cold-formed structural and vehicle parts. M-CF: property state of the finished cold-formed profile: strength raised and ductility lowered locally at bends. Yield strength is 400 MPa in M versus 480 MPa in M-CF.
Sources
- EN 10149-2 — Hot rolled flat products made of high yield strength steels for cold forming: thermomechanically rolled steels — CEN (2013)
- GB/T 1591 — High strength low alloy structural steels (Q355M) — SAC (2018)
- 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)
- Hot rolled structural steels for cold forming (S315MC–S700MC) product data — SSAB / voestalpine / Baosteel (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.