What is the technical Condition of S690QL1 Plates?
S690QL1 plates are ultra-high-strength structural steels delivered in a Quenched and Tempered (Q+T) condition, meeting EN 10025-6 standards, featuring a minimum yield strength of 690 MPa and excellent toughness at low temperatures (down to -60°C), making them ideal for heavy-duty, load-bearing structures needing high strength-to-weight ratios, with specific tests like Charpy impact, tensile, and ultrasonic testing ensuring quality.
S690QL1 is a quenched and tempered high-strength structural steel plate manufactured under the European standard EN 10025-6. The "S" prefix denotes its status as a European structural steel, which corresponds to the Chinese national standard Q690F.
Technical Specifications and Delivery
The delivery status for S690QL1 is strictly quenching and tempering. It is important to note that direct quenching and tempering performed immediately after hot rolling is recognized as conventional quenching and tempering. The steel utilizes controlled rolling technology, ensuring a pure quality with low concentrations of harmful elements such as Sulfur (S) and Phosphorus (P), which significantly enhances its welding performance.
Characteristics and Performance
S690QL1 is specifically designed for the manufacture of key components that require a combination of low-temperature resistance and high yield strength (approximately 690 MPa). Its high purity and structural integrity make it a reliable choice for heavy-duty load-bearing applications.
Application Range
S690QL1 steel plate is widely used across various engineering and mining sectors to manufacture structural parts for:
Construction Machinery: All types of cranes, drilling machines, excavators, loaders, and bulldozers.
Mining Equipment: Mining cars, electric shovels, electric wheel tippers, and coal mine hydraulic supports.
General Engineering: Plant construction, bridge components, and other high-strength structural frameworks.
What is the difference between s690ql1 and s355?
S690QL1 is a high-strength, quench-and-tempered (QL1) steel with a minimum yield strength of 690 MPa, offering superior strength-to-weight for heavy lifting, while S355 (EN 10025-2) is a standard structural steel with a lower yield strength of 355 MPa, making it versatile but heavier for equivalent load capacity, used in general construction. The main difference is S690QL1's significantly higher strength, allowing for lighter designs in demanding applications like cranes, compared to S355's broader use in typical structures.
What is the effective use of high strength S690ql1 steel in construction?
High-strength S690QL1 steel is effectively used in construction for critical, heavy-duty applications like bridges, high-rise buildings, cranes, and stadiums, enabling slimmer, lighter designs, reduced material, and greater efficiency due to its superior strength-to-weight ratio (≥690 MPa yield), excellent weldability, toughness, and fatigue resistance. It allows for longer spans, fewer supports, and reduced foundation needs, making structures safer, more sustainable, and cost-effective, especially in demanding environments.
What is S690ql1 Plate Thickness?
S690QL1 steel plate thickness varies by manufacturer but typically ranges from as thin as 3-4mm up to 400mm or more, commonly supplied in thicknesses like 12-60mm, 5-200mm, or 6-290mm, designed for high-strength structural uses requiring good toughness at very low temperatures (down to -60°C), as per EN 10025-6.
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 |
Equivalent grades of steel S690QL1 (1.8988)
| EU EN |
Germany DIN,WNr |
|
| S690QL1 |
|
S690QL1 Steel Plate Notch Impact Energy
|
Steel Grade |
Position of Samples |
0°C |
- 20°C |
- 40°C |
- 60°C |
|
S690QL1/MAXIL® 690 QL1 |
LongitudinalTransverse |
60 J40 J |
50 J35 J |
40 J30 J |
30 J27 J |
1What 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 properties are defined by its high yield strength (≥690 MPa) and excellent toughness at low temperatures, with typical Brinell hardness often cited around 235-295 BHN, though it's primarily valued for strength, not hardness testing.
2What is the S690QL1 standard?
The S690QL1 standard refers to a specific grade of high-yield strength, quenched and tempered structural steel defined under the European standard EN 10025-6, known for exceptional strength (min. yield 690 MPa), toughness, and weldability, used for critical components in construction, heavy machinery, and defense where high load capacity and weight efficiency are crucial, like crane booms or bridges. The "S" means structural, "690" is its minimum yield strength (in MPa), "Q" signifies quenching, "L" means normalized rolling, and "L1" denotes specific impact testing at low temperatures, indicating superior toughness.
3What is S690QL1 material?
S690QL1 is a high-strength, quenched, and tempered (Q+T) structural steel plate (EN 10025-6) known for its exceptional yield strength (minimum 690 MPa) and toughness, even at extremely low temperatures (tested to -60°C), making it ideal for heavy-duty, load-bearing applications like cranes, excavators, bridges, and mining equipment where superior strength, durability, and resistance to brittle fracture are critical.
4What 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 equivalents include ASTM A514/A709 Grade 100, EN 10149-2 S700MC, and brand names like Dillimax 690E, WeldoX 700, and AM 700, offering similar properties for demanding applications requiring high strength and toughness, especially at low temperatures.
5What is the difference between S690QL1 and S690QL?
The main difference between S690QL and S690QL1 is their impact toughness testing temperature: S690QL is tested at -40°C, while S690QL1 is tested at a colder -60°C, making it superior for extremely cold environments, though both offer a minimum 690 MPa yield strength and excellent weldability for demanding applications like cranes, bridges, and heavy machinery.
6What temperature is S690QL1 ?
S690QL1 is a high-strength structural steel designed for very cold temperatures, specifically guaranteed to meet impact toughness requirements down to -60°C (-76°F), unlike S690QL which is tested at -40°C, making S690QL1 ideal for extreme cold applications like arctic or offshore structures. While its application temperature range can go up to 350°C, its defining characteristic is its superior low-temperature performance.
7What are the typical application fields of S690QL1 ?
S690QL1, a high-yield strength quenched and tempered structural steel, is used in demanding, weight-sensitive applications like heavy machinery (cranes, excavators, loaders), bridges, offshore structures, mining equipment, truck chassis, and large trailers, where its superior strength, toughness, and durability allow for lighter yet robust designs, reducing material costs and improving payload capacity.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff
