What is S690QL1 material?
S690QL1 is a high-strength, quenched, and tempered structural steel plate (EN 10025-6 standard) known for its minimum yield strength of 690 MPa, excellent toughness, and weldability, particularly its superior impact resistance at very low temperatures (down to -60°C), making it ideal for heavy-duty, demanding applications like construction machinery, cranes, and mining equipment. The "QL1" signifies its exceptional cold-impact toughness, distinguishing it from S690Q (which is tested at -20°C).
S690QL1 is an ultra-high-yield structural steel grade produced in accordance with the EN 10025-6 standard. The "S" signifies its role as a structural material, while "690" denotes its minimum yield strength of 690 MPa. This material undergoes a rigorous Quenching and Tempering (Q+T) heat treatment process, which refines its grain structure to achieve a superior balance of hardness and ductility. Unlike standard carbon steels, S690QL1 offers a much higher strength-to-weight ratio, allowing engineers to design lighter, more efficient components that can withstand extreme mechanical stresses without permanent deformation.
Key Characteristics:
High Strength: Minimum yield strength of 690 MPa (megapascals).
Low-Temperature Toughness: Tested for impact energy at -60°C, preventing brittle fracture.
Heat Treatment: Quenched and Tempered (Q&T) for enhanced mechanical properties.
Weldability: Good, due to low sulfur and phosphorus content, suitable for complex fabrication.
High Strength-to-Weight Ratio: Allows for thinner sections, reducing material use and improving efficiency.
Common Applications:
Engineering Machinery: Excavators, loaders, dozers, cranes, hydraulic supports.
Construction: Bridges, high-rise buildings, heavy structures.
Transportation: Chassis and dumper bodies for heavy road vehicles, railway components.
Mining: Machinery structures, haul trucks.
Production & Delivery:
Standard: EN 10025-6.
Delivery Condition: Quenched and tempered
What is s690qL1 steel comparable to?
S690QL1 is a high-yield strength, quenched & tempered (Q&T) structural steel, comparable to grades like ASTM A514 (Grade Q) in the US, German EStE690V, Swedish WELDOX 700E, and Japanese JFE HITEN 780LE, all offering excellent strength, toughness, and weldability for demanding applications in construction, heavy machinery, and offshore industries.
Is S690QL1 hard to drill?
Yes, S690QL1 is significantly harder to drill than standard structural steels like S355, primarily due to its high yield strength (690 MPa) and the Quenched and Tempered (Q+T) delivery condition. While it is not "un-drillable," it requires professional-grade tooling and specific parameters to prevent the material from work-hardening or destroying your drill bits.
What is the difference between S690QL1 and S690QL?
The main difference between S690QL and S690QL1 is their specified minimum impact toughness at lower temperatures: S690QL is tested at -40°C, while S690QL1 is tested at a more extreme -60°C, making S690QL1 superior for applications in exceptionally cold environments requiring higher impact energy absorption. Both are high-strength, quenched, and tempered (Q&T) structural steels with a minimum yield strength of 690 MPa, excellent weldability, and toughness, but the "L1" designation signifies enhanced low-temperature performance.
Chemical composition % of steel S690QL1 (1.8988): EN 10025-6-2004
| C | Si | Mn | Ni | P | S | Cr | Mo | V | N | Nb | Ti | Cu | Zr | B | CEV |
| max 0.2 | max 0.8 | max 1.7 | max 2 | max 0.02 | max 0.01 | max 1.5 | max 0.7 | max 0.12 | max 0.015 | max 0.06 | max 0.05 | max 0.5 | max 0.15 | max 0.005 | max 0.83 |
Mechanical properties of steel S690QL1 (1.8988)
| Nominal thickness (mm): | 3 - 50 | 50 - 100 | 100 - 150 |
| Rm - Tensile strength (MPa) | 770-940 | 760-930 | 710-900 |
| Nominal thickness (mm): | 3 - 50 | 50 - 100 | 100 - 150 |
| ReH - Minimum yield strength (MPa) | 690 | 650 | 630 |
| KV - Impact energy (J) longitud., | 0° 60 |
-20° 50 |
-40° 40 |
-60° 30 |
| A - Min. elongation Lo = 5,65 √ So (%) | 14 |
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Equivalent steel grade of S690QL1 |
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Europe |
Germany |
France |
Sweden |
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EStE 690 V |
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S690QL1 Steel Plate Notch Impact Energy
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Steel Grade |
Position of Samples |
0°C |
- 20°C |
- 40°C |
- 60°C |
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S690QL1/MAXIL® 690 QL1 |
LongitudinalTransverse |
60 J40 J |
50 J35 J |
40 J30 J |
30 J27 J |
1What are the properties of s690ql1?
S690QL1 is a high-yield strength, quenched & tempered structural steel (EN 10025-6) known for its high strength (min. 690 MPa yield), excellent low-temperature toughness, good weldability, and formability, making it ideal for heavy-duty applications like cranes, bridges, and mining equipment where lightweight design and high load capacity are crucial. Its properties include superior impact resistance, enhanced fatigue performance, and fine grain structure for demanding conditions, with specific mechanical properties varying slightly by thickness.
2What are common testing requirements for S690QL1?
Common testing requirements for S690QL1, a high-strength structural steel, focus on its key properties: minimum 690 MPa yield strength, 770-940 MPa tensile strength, and crucial -60°C impact toughness (QL1 designation), verified through tensile tests and longitudinal Charpy-V notch impact tests on heat-treated plates, ensuring performance in demanding, cold environments, with testing typically per EN 10025-6 standard.
3What is S690QL1 equivalent to?
S690QL1 (EN 10025-6) is a high-strength, quenched, and tempered structural steel with a minimum yield strength of 690 MPa, and its common equivalents include ASTM A514, ASTM A709 Grade 100, ASTM A710, German EStE690V (DIN/WNr 1.8988), French E690T, and Swedish SS 2625 (Weldox 700), though exact interchangeability requires engineering confirmation due to specific code requirements.
4What is the hardness of S690QL1 steel?
S690QL1 steel, a high-strength quenched and tempered structural steel, doesn't have a single mandatory hardness value specified in the standard, but its hardness typically falls in the range of 235-295 BHN (Brinell Hardness Number), though it can be harder depending on processing, with the focus being on its high yield strength (≥690 MPa) and excellent toughness, making it suitable for heavy-duty, lightweight structures.
5What temperature is S690QL1 steel?
S690QL1 steel is designed for low-temperature service, specifically meeting impact toughness requirements at -60°C (-76°F), making it excellent for cold environments, with typical operating temperatures ranging from roughly -60°C up to 350°C, though its properties (like yield strength) decrease at higher temperatures, and it requires preheating for welding and quenching/tempering after hot forming.
6What are the typical application fields of S690QL1 ?
S690QL1, a high-yield strength, quenched, and tempered steel, is used in heavy-duty, high-stress applications where weight saving and durability are crucial, such as cranes (booms, jibs), heavy construction equipment (excavators, bulldozers), bridges, offshore structures, mining machinery, truck chassis, and pressure vessels, benefiting from its high strength-to-weight ratio, excellent toughness at low temperatures (down to -60°C), and good weldability for lighter, stronger designs.
7What is the density of s690ql1 steel?
The density of S690QL1 steel, like most steels, is approximately 7850 kg/m³ (or 7.85 g/cm³), a standard value for quenched and tempered high-strength steels, although slight variations might occur due to specific alloying elements and manufacturing, generally falling around 7.84 - 7.85 g/cm³.
If you have project requirements for S690QL1 , 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:info@gneesteels.com
