S690QL High Strength Structural Steel Plate
S690QL High Strength Structural Steel Plate
Steelox SA’s S690QL high strength structural steel plate is engineered for demanding load-bearing applications where high yield strength, excellent toughness, and structural reliability are essential. Supplied in quenched and tempered condition, S690QL enables lighter structures without compromising safety or performance.
Why Choose S690QL from Steelox SA?
– Very high yield strength for weight reduction and structural efficiency
– Excellent low-temperature impact toughness
– Reliable welding performance when correct procedures are followed
– Supplied in quenched and tempered (Q&T) condition
– Manufactured to international standards
– Supported by Steelox SA technical and application expertise
Chemical Composition (Ladle Analysis)
The chemical composition below is provided for technical reference and remains unchanged.
| C | Si | Mn | P | S | N | B | Cr | Cu | Mo | Nb | Ni | Ti | V | Zr |
| 0.20 | 0.80 | 1.70 | 0.02 | 0.01 | 0.015 | 0.005 | 1.50 | 0.50 | 0.70 | 0.06 | 2.00 | 0.05 | 0.12 | 0.15 |
Maximum CEV (based on ladle analysis):
S690QL thickness < 100 mm: 0.65% max
CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/15
Mechanical Properties
| Thickness (mm) | Min Yield Strength (MPa) | Tensile Strength (MPa) | Elongation min % |
| > 4 – 50 | 690 | 770 – 940 | 14 |
| > 50 – 100 | 650 | 760 – 930 | 14 |
Impact Properties
| Test Type | Specimen | Test Temperature (°C) | Impact Energy (J) |
| Longitudinal | Charpy-V 10 × 10 mm | -20 | 40 |
| Longitudinal | Charpy-V 10 × 10 mm | -40 | 30 |
Delivery Condition
S690QL is supplied in Quenched and Tempered (Q&T) condition to ensure consistent mechanical performance and structural integrity.
Typical Applications
– Cranes and lifting equipment
– Heavy-duty construction machinery
– Mining structures and load-bearing components
– Transport, trailer, and chassis applications
– Structural components requiring high strength with reduced thickness
Tolerances and Quality
– Thickness tolerance: EN 10029 Class B (tighter tolerances available upon request)
– Shape, length, and width tolerances: EN 10029
– Flatness tolerance: EN 10029 Class N, Type H
– Surface quality: EN 10163-2:2004 Class A, Subclass 1
– Ultrasonic testing: EN 10160:2004 Class S1E1
Welding Recommendation
S690QL steel plates shall be preheated prior to welding. Steelox SA recommends approved welding procedures to ensure optimal performance.
For project support, material selection, or fabrication guidance, contact Steelox SA — your trusted partner in high-strength structural steel solutions.