S690QL High Yield Structural Steel - Properties and Applications

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.

S690QL - Grade Designation

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

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. Aluminium is also one of these elements.


S690QL - Mechanical Properties

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


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 Masteel)


S690QL - Applications

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


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