S690 QL is a high yield structural steel grade manufactured in compliance with the EN 10025:6:2004 standard. The quench and temper process is used to heat-treat the material. It has good bending and welding properties.
Owing to the high strength nature of the material, the use of S690QL will promote leaner designed structures with improved energy efficiency and payload capacity.
The technical details of S690QL are presented below.
S690QL - Grade Designation
The following are the grade designations of S690QL:
- S = Structural Steel
- 690 = minimum yield strength (MPa)
- Q = Quenching & Tempering
- L = Low notch toughness testing temperature
S690QL - Chemical Composition
| 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
| 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
| 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-for exact specifications please check with Masteel)
S690QL - Applications
S690QL high yield structural steel is used in a range of sectors including:
- Lifting equipment
- Steel constructions
- Machine building
- Heavy transportation
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.