S550QL is a structural steel that belongs to the EN European standard. The steel grade is specifically designed for high yield strength and low temperature impact resistance. The "QL" in the grade name stands for Quenched and Tempered, indicating the manufacturing process used to obtain the desired properties.
One of the most outstanding features of S550QL is its high yield strength, which refers to the maximum stress that a steel can withstand without permanent deformation.With a minimum yield strength of 550 MPa, S550QL is ideally suited for applications that require robustness and load-bearing capacity. The steel is commonly used in heavy construction machinery such as cranes, bridges and off-road vehicles.
Chemical composition % of steel S550QL (1.8926):
| C | Si | Mn | Ni | P | S | Cr | Mo | V | N | Nb | Ti | Cu | Zr | B | CEV |
| max 0.2 | max 0.8 | max 1.7 | max 2 | max 0.02 | max 0.01 | max 1.5 | max 0.7 | max 0.12 | max 0.015 | max 0.06 | max 0.05 | max 0.5 | max 0.15 | max 0.005 | max 0.83 |
Mechanical properties of steel S550QL (1.8926):
| Nominal thickness (mm): | 3 - 100 | 100 - 150 |
| Rm - Tensile strength (MPa) | 640-820 | 590-770 |
| Nominal thickness (mm): | 3 - 50 | 50 - 100 | 100 - 150 |
| ReH - Minimum yield strength (MPa) | 550 | 530 | 490 |
| KV - Impact energy (J) longitud., | 0° 50 |
-20° 40 |
-40° 30 |
| A - Min. elongation Lo = 5,65 √ So (%) | 16 |
