The S690QL is a high yield structural steel grade manufactured in compliance with EN 10025:6:2004. The material is heat treated using the quench and temper process and has good welding and bending properties.
Owing to the material’s high strength nature, using the S690QL will promote leaner designed structures with better payload capacity and energy efficiency.
The technical details of S690QL are outlined below.
S690QL - Grade Designation
The grade designation of S690QL is listed below:
- S = Structural Steel
- 690 = minimum yield strength (MPa)
- Q = Quenching and Tempering
- L = Low notch toughness testing temperature
S690QL - Chemical Composition
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. Aluminum is also one of these elements.
S690QL - Mechanical Properties
The mechanical properties of S690QL are 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 |
S690QL - V Notch Impact Testing
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 Pressure Vessel Steels)
S690QL - Applications
The S690QL high yield structural steel is used in numerous sectors including:
- Steel constructions
- Heavy transportation
- Lifting equipment
- Machine building
This information has been sourced, reviewed and adapted from materials provided by Pressure Vessel Steels (UK) Ltd.
For more information on this source, please visit Pressure Vessel Steels (UK) Ltd.