S550MC is a European standard (EN 10149-2) for a hot-rolled, high-yield-strength structural steel used in applications requiring high load-bearing capacity, good formability, and weldability.
The "S" denotes structural steel, the "550" indicates a minimum yield strength of 550 MPa, and "MC" signifies microalloyed for cold forming. The material's high strength and good formability make it an attractive option for weight-saving designs.
S550MC Steel is a hot-rolled weldable fine-grained structural steel in the European standard EN10149 series. Due to its excellent mechanical properties and processing characteristics, it is widely used in automobile manufacturing, engineering machinery, building structures and other fields.
EN10149 S550MC cold-formed high-strength steel, with a yield strength of 550 MPa, reduces vehicle weight by 15%. Its excellent cold bending and welding properties make it an ideal choice for key automotive components such as chassis and anti-collision beams, achieving a perfect balance between lightweighting and cost-effectiveness.
EN 10149-2 S550mc Plate Standard Specification
| Grade | S550MC |
| Steel Number | 1.0986 |
| Plate Thickness Range | 2 - 10 mm |
| Width (in mm) | Up to 1600 mm |
| Length (in mm) | Up to 16000 mm |
| Other Grades | S355MC, S460MC, S420MC, S550MC, S500MC, S650MC, ALFORM, S700MC, PERFORM |
S550mc steel equivalent ASTM
| S700MC EN 10149-2 Plate grades Comparision | |
| GB | HR550F |
| SEW092 | QStE 690TM |
| BS1449 | 75F70 |
| NFA36-231 | E690D |
| UNI8890 | FeE560TM |
| ASTM | A514 |
Typical Applications of the S550MC in Automotive Manufacturing
The S550MC is primarily suitable for components requiring high strength and formability, such as:
-Chassis structural components: Load-bearing components such as longitudinal beams and cross members, which achieve weight reduction through high strength.
-Body reinforcements: Such as B-pillar inner panels and anti-collision beams, which absorb energy during collisions.
Thanks to its fine-grained microstructure and high degree of purity, grade S550MC is well suited for cold bending, folding and cold flanging without cracking. The name of grade S550MC refers to its upper yield strength. This is 550 MPa.
The following minimum values for the bending radii should be considered:
Thermomechanically rolled steel for cold working
| Nominal thickness (t), mm | Min. bending radius |
| <= 3 | 1.0 t |
| 3< t <=6 | 1.5 t |
| t >6 | 2.0 t |
S550MC | 1.0986: Properties according to DIN EN 10 149-2
Steel type
| Short designation | VDA239-100* | Material number |
| S550MC | HR550LA | 1.0986 |
* Comparative grade, therefore minor deviations from DIN EN values possible
S550MC | 1.0986: Mechanical properties, longitudinal
| Upper yield1) strength ReH MPa min. | Tensile strength Rm MPa | Elongation at fracture A80 % min. | Elongation at fracture A3) % min. |
| 550 | 600–760 | 12 | 14 |
S550MC | 1.0986: Chemical composition (heat analysis)
| Percentage by weight % max. | ||||||||
| C | Mn | Si | P | S | Altotal min. | Nb | V | Ti |
| 0.12 | 1.80 | 0.50 | 0.025 | 0.015 | 0.015 | 0.092) | 0.202) | 0.15 2) |
S550MC Following Testing And Inspection Criteria:
Through-thickness testing to BS EN 10164 Z25
UT soundness test to BS EN 10160
Thickness verification options:
In accordance with BS EN 10029 Class C
Actual thickness checked by inspection, grid survey 100mm x 100mm
S550MC Common applications:
Due to its high strength, formability, and weldability, S550MC is used across multiple industries.
Automotive: Frames, body panels, and structural reinforcements.
Construction: Steel beams, frames, and other load-bearing structures.
Heavy machinery: Components for cranes, earthmoving equipment, and other equipment subjected to extreme loads.
Transportation: Structural elements in shipbuilding and railway cars.
Structural pipes: Used for high-strength, cold-rolled sections and structural pipes.
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