Applications of High Yield Structural Steel – S690QL

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.

S690 QL

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

Masteel

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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