S690 QL 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.
The technical details of S690QL are outlined below.
The grade designation of S690QL are the following:
- S = Structural Steel
- 690 = minimum yield strength (MPa)
- Q = Quenching & Tempering
- L = Low notch toughness testing temperature
The chemical composition of S690QL is provided in the table below.
| Element |
Percentage % |
Element |
Percentage % |
| C |
0.20 |
Cu |
0.50 |
| Si |
0.80 |
Mo |
0.70 |
| Mn |
1.70 |
Nb* |
0.06 |
| P |
0.025 |
Ni |
2.0 |
| S |
0.015 |
Ti* |
0.05 |
| N |
0.015 |
V* |
0.12 |
| B |
0.0050 |
Zr* |
0.15 |
| Cr |
1.50 |
|
|
* At least 0.015% of grain-refining element present. Aluminium is also one of these elements.
The mechanical properties of S690QL is outlined in the table below.
| 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 |
The V Notch impact testing details are given in the table below.
| Grade |
Sample Orientation |
@ 0°C |
@-20°C |
@-40°C |
@-60°C |
| S690QL |
Longitudinal |
50 J |
40 J |
30 J |
¨C¨C |
| Traverse |
35 J |
30 J |
27 J |
¨C¨C |
(Please note: the technical information above is for guidance only ¨C for exact specifications please check with Masteel)
S690QL high yield structural steel is used in a variety of sectors including:
- Heavy transportation
- Machine building
- Steel constructions
- Lifting equipment
This information has been sourced, reviewed and adapted from materials provided by Masteel UK Ltd.
For more information on this source, please visit Masteel UK Ltd