S550Q yog quenched thiab tempered high-strength steel phaj, uas yog tshwj xeeb alloy hlau. Qhov cuam tshuam kev ua tau zoo yog teev nyob rau ntawm qhov kub tsis tsawg dua -20 degrees; qhov cuam tshuam kev ua haujlwm ntawm qhov kub tsis tsawg dua -40 degrees yog teev raws li: L; Qhov cuam tshuam kev ua haujlwm ntawm qhov kub ntawm -70 degrees yog sau tseg li: L1.
Cov tshuaj muaj pes tsawg leeg% ntawm steel S550Q (1.8904):
| 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 Nws | max2 ua | max 0.025 | max 0.015 | max 1.5 hli | 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 zog ntawm steel S550Q (1.8904):
| Nominal thickness (hli): | 3 - 100 | 100 - 150 |
| Rm- Tensile zog (MPa) | 640-820 | 590-770 |
| Nominal thickness (hli): | 3 - 50 | 50 - 100 | 100 - 150 |
| ReH- Tsawg tshaj tawm lub zog (MPa) | 550 | 530 | 490 |
| KV- Impact zog (J) longitud., | 0 degree 40 |
-20 degree 30 |
| A- Min. elongation Lo=5,65 √ Yog li (%) | 16 |
