Steel S355MC (1.0976)
Thermomechanically rolled fine grain structural steel to EN 10149-2, material number 1.0976. The strength comes out of the rolling schedule rather than out of the alloy, so it is about 50 % stronger than S235 while staying fully weldable and cold formable. Unalloyed, so it rusts.
Typical parts: Load bearing brackets, machine frames, base plates, gussets and mounting feet, anything bolted into a structure where a thin part would deflect.
Technical Properties
| Composition | Fe remainder, C max 0.12, Si max 0.50, Mn max 1.50, Al min 0.015, Nb max 0.09, V max 0.20, Ti max 0.15 (%) |
|---|---|
| Standard | EN 10149-2 |
| Material number | 1.0976 |
| Density | 7.85 g/cm³ |
| Tensile strength Rm | 430 to 550 N/mm² |
| Yield strength Rp0.2 | min 355 N/mm² |
| Elongation at break A | min 19 % |
| Hardness | approx 150 HBW |
| Elastic modulus E | 210 GPa |
| Thermal conductivity | 45 W/(m·K) |
| Melting point | approx 1500 °C |
| Heat treatable | No, carbon too low |
| Weldable | Yes, no preheat at these gauges |
| Magnetic | Yes |
| Does it rust | Yes, needs coating or plating |
Available thicknesses and manufacturability
| Thickness (mm) | Weight (kg/m²) | Min. Hole Diameter | Min. Bridge Width | Min. Hole-to-Edge |
|---|---|---|---|---|
| 3 mm | 23.55 | 1.5 mm | 0.6 mm | 0.6 mm |
| 4 mm | 31.40 | 2 mm | 0.8 mm | 0.8 mm |
| 5 mm | 39.25 | 2.5 mm | 1 mm | 1 mm |
| 6 mm | 47.10 | 3 mm | 1.2 mm | 1.2 mm |
Max Part Size: 550 x 1150 mm · Min. Part Size: 10 x 10 mm
Calculate the weight for your dimensionsWhat a part in Steel S355MC costs
Example: a mounting plate 100 × 60 mm, 2 × 2 holes (5.5 mm, for M5) in every thickness, computed when this page loads with the configurator's own formula. Price per piece incl. VAT, plus shipping.
| Thickness | 1 pcs | 10 pcs | 100 pcs |
|---|---|---|---|
| 3 mm | €14.47 | €5.80 | €3.67 |
| 4 mm | €16.03 | €6.82 | €4.53 |
| 5 mm | €17.46 | €7.82 | €5.40 |
| 6 mm | €18.83 | €8.79 | €6.26 |
The configurator prices other sizes, holes and shapes as you type; you pick material and thickness there next to the part. Configure this plate
Parts in Steel S355MC
These parts have a page of their own with prices, limits and the questions people ask most:
- Custom Laser-Cut Metal Sign
- Custom Washers and Shims, Laser Cut
- Custom Gusset Plates, Laser Cut
- Custom Front and Enclosure Panels
- Metal Lettering, Laser Cut to Order
- Custom Mounting Plate with Holes
- Custom Metal Plate, Laser Cut to Size
- Custom Metal Disc, Laser Cut
- Slotted Flat Bar, Laser Cut to Size
- Custom Link Plate, Laser Cut
- Laser-Cut Metal Gear, Made to Size
- Custom Hinge Plate in Metal
Compare materials
Which thickness for which part
S355MC is a fine-grained structural steel for load-bearing parts. You will also find it as 1.0976, or under the old name QStE 380 TM. We cut 3 to 6 mm:
- Brackets and tabs with one M8 or M10 bolt: 3 to 4 mm
- Gusset plates and connectors for timber and steel frames: 4 to 5 mm
- Mounting plates for motors, pumps and gearboxes: 4 mm up to about 50 kg, 6 mm above that
- Base plates for posts and columns: 5 to 6 mm
These are rules of thumb for static loads. Anything that is part of a structure, carries people or could do damage if it fails needs a proper calculation.
How the part arrives
The parts come dry and unoiled. Like any unalloyed steel, they start to rust in damp air, so coat them soon or store them dry.
From 3 mm the cut edges can be sharp and carry a burr on the underside. For parts you will handle a lot, or that will be coated, deburring is worth ordering.
Tolerance is ISO 2768-m: a hole up to 6 mm is within ±0.1 mm, the distance between two holes 150 mm apart within ±0.5 mm. That matters when the holes have to line up with an existing frame.
Holes, threads and welding
- Clearance holes: Draw them to ISO 273 medium, 9 mm for M8, 11 mm for M10, 13.5 mm for M12. The bolt then fits even with tolerance and a coat of paint.
- Threads: Core holes are 6.8 mm for M8, 8.5 mm for M10, 10.2 mm for M12. From 5 mm an M8 thread in the plate holds well; for higher loads, a nut or a through bolt is the safer choice.
- Welding: S355MC welds with MAG in these thicknesses without preheating. Gussets and base plates can be welded on directly.
- Coating: We do not coat in house; any powder coater or plater can take the parts as they come from us. For steelwork that stands outdoors for good, hot-dip galvanising at a local galvaniser is the most durable option.
Common mistakes
- Holes drawn exactly to bolt size: An 8 mm hole for an M8 bolt does not fit, especially once it is powder coated. Always draw the clearance hole.
- Too thin for the load: A 3 mm plate that flexes under a motor makes noise and eventually cracks at the holes. When in doubt, go one step thicker.
- Welding after powder coating: The coating burns off at the weld and leaves a spot that rusts. Weld first, then coat.
- Bare steel outdoors: S355MC rusts like any structural steel. Outdoors it needs powder coating or galvanising.
Questions and Answers
- Why this and not S235?
- Rp0.2 of 355 against 235, so about 50 % more yield at the same section. A 4 mm part here does what 6 mm S235 does: a third less weight, a third less cutting time. The thermomechanical rolling buys that without adding carbon, so weldability is untouched.
- Bend radii?
- Larger than DC01. Reckon on one to one and a half thicknesses inner radius, across the rolling direction. It is a cold forming grade, but it is not a drawing grade.