S690QL
High Yield Strength Structural Steel (EN 10025‑6)
1 Steel description and applications
S690QL is a high‑yield strength structural steel (material number 1.8928) supplied in the quenched and tempered condition. It provides an excellent balance of strength, toughness, abrasion resistance and weldability. Typical hardness is 235–295 BHN (informational only).
Recommended applications
- Earthmoving equipment and dump trucks
- Mobile cranes and drilling rigs
- High‑speed fans
- Bridges and lightweight, high‑capacity structures
2 Chemical composition (% max, ladle/product)
| C | Si | Mn | P | S | Cr | Ni | Mo | Cu | B | N |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.20 | 0.80 | 1.70 | 0.020 | 0.010 | 1.50 | 2.0 | 0.70 | 0.50 | 0.005 | 0.015 |
Notes: Mechanical properties at ambient temperature. Hardness is for information only and not a requirement for structural steels. Dimensions and tolerances as per EN 10029. Recommended inside bend radii values apply for bend angles ≤ 90°.
Approximate equivalents
ASTM A514, EN 10149‑2 S700MC, AS/NZS 3579 Grade 700, AM 700, Bisalloy 80.
3 Other mechanical properties (typical values)
| Nominal thickness (mm) | Min. yield (MPa) | Tensile strength (MPa) | Min. elongation (%) | Impact energy @ −40°C | Min. inside bend radius |
|---|---|---|---|---|---|
| 3 ≤ t ≤ 50 | 690 | 770 – 940 | 14 | 30 J (L) / 27 J (T) | 3t (T) / 4t (L) |
| > 50 ≤ 100 | 650 | 760 – 930 | 14 | 30 J (L) / 27 J (T) | — |
| > 100 ≤ 150 | 630 | 710 – 900 | 14 | 30 J (L) / 27 J (T) | — |
4 Fabrication & forming
S690QL plates can be readily formed or bent at room temperature with adequate power and proper procedures. As a guide, forming power is typically three times that for conventional carbon structural steels.
Hot forming: avoid temperatures above 560 °C, as this may alter the initial tempering and affect mechanical properties.
5 Standard stock list
- 12000 × 2500 × 6 / 8 / 10 / 12 / 16 / 20 / 25 / 30 mm
- 12000 × 2500 × 40 / 50 / 60 / 65 / 70 / 75 mm
- 6000 × 2500 × 80 / 90 / 100 / 125 / 150 mm