Structural Steel with a High Yield – S690QL

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.

structural steel

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

Pressure Vessel Steels (UK) Ltd.

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.


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