S690Q is a hot-rolled hardened structural steel that has undergone subsequent tempering treatment and conforms to the EN 10025-6, DSTU EN 10025-6 standard.
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.
S690Q - Chemical Composition
| C | Mn | Si | P | S | B | Nb | V | Ti | Cr | Mo | Ni | Cu | N | Zr |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.20 | 1.70 | 0.80 | 0.020 | 0.010 | 0.005 | 0.06 | 0.12 | 0.05 | 1.50 | 0.70 | 2.0–4.0 | 0.50 | 0.015 | 0.15 |
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 |
S690Q and S690QL are both high-strength structural steels with a minimum yield strength of 690 MPa, but the key difference is their mandated low-temperature impact toughness, with S690QL ("L" for Low Temp) guaranteed at -40°C (≥30-40J), while S690Q is typically specified for toughness at -20°C (≥30J), making S690QL superior for very cold applications like arctic structures or offshore platforms. The 'QL' designation signifies enhanced toughness at lower temperatures compared to the standard 'Q' grade.
When to choose S690Q
Temperate Climates: Structures operating under normal temperature ranges where extreme cold isn't a factor.
Lighter Duty Applications: Where the absolute lowest temperature performance isn't critical.
When to choose S690QL
Cold Climates: Structures in regions with sub-zero temperatures.
Offshore Platforms: Due to dynamic loading and cold conditions.
Heavy Machinery: Mining vehicles or cranes operating in Siberia or similar.
If you have project requirements for S690Q and S690QL, we welcome your inquiry. GNEE maintains a large inventory of commonly used high strength steel grades for your selection.For detailed mechanical properties, chemical composition, and technical data, as well as free samples, please contact our factory immediately. We offer competitive prices, stable quality, and professional service. Email:beam@gneesteelgroup.com.
1.What grade of steel is S690?
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.
2.Is S690Q a high end steel?
Yes, S690Q is considered a high-end, high-strength structural steel, valued for its exceptional yield strength (690 MPa minimum), excellent toughness, and superior strength-to-weight ratio, enabling lighter, more efficient designs in heavy engineering, construction, and machinery where performance under extreme loads is critical.
3.What is equivalent to S690QL steel?
ASTM A514, EN 10149-2 Grade S700MC, AS/NZS 3579 Grade 700, AM 700, Bisalloy 80.