S690 QL steel is a high yield structural steel grade produced in compliance with EN 10025:6:2004. The material is heat treated using the quench and temper process and has good bending and welding properties.
Due to the materials high strength nature, using S690QL will promote leaner designed structures with increased payload capacity and energy efficiency.
Please refer to the technical details below referring to S690QL.
S690 QL steel Grade Designation
· S = Structural Steel
· 690 = minimum yield strength (MPa)
· Q = Quenching & Tempering
· L = Low notch toughness testing temperature
S690 QL steel Chemical Composition
S = Structural Steel
690 = minimum yield strength (MPa)
Q = Quenching & Tempering
L = Low notch toughness testing temperature
S690 QL steel Chemical Composition
| Grade | C | Si | Mn | P | S | N | B | Cr | Cu | Mo | Nb* | Ni | Ti* | V* | Zr* |
| S690QL | 0.20 | 0.80 | 1.70 | 0.025 | 0.015 | 0.015 | 0.0050 | 1.50 | 0.50 | 0.70 | 0.06 | 2.0 | 0.05 | 0.12 | 0.15 |
* At least 0.015% of grain-refining element present. Aluminium is also one of these elements.
S690 QL steel Mechanical Properties
| Designation | Mechanical Properties (ambient temperature) | ||||||||||
| Steel Name | Steel Number | Min. Yield Strength Reh MPa | Tensile Strength Rm MPa | Min. % elongation after fracture | |||||||
| Nominal thickness (mm) | Nominal thickness (mm) | ||||||||||
| ≥3 ≤50 | ≥50 ≤100 | ≥100 ≤150 | ≥3 ≤50 | ≥50 ≤100 | ≥100 ≤150 | ||||||
| S690QL | 1.8931 | 690 | 650 | 630 | 770/940 | 760/930 | 710/900 | 14 | |||
V Notch Impact Testing
| Grade | Sample Orientation | @ 0°C | @-20°C | @-40°C | @-60°C |
| S690QL | Longitudinal | 50 J | 40 J | 30 J | –– |
| Traverse | 35 J | 30 J | 27 J | –– |
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