S690Q refers to a high-yield-strength structural steel (EN 10025-6) known for its exceptional strength (minimum 690 MPa yield) and toughness after quenching and tempering (the 'Q'), used in heavy-duty equipment like cranes, mining gear, and construction; however, "S690Q" also denotes a budget PCIe Gen4 NVMe SSD from brands like Fanxiang, offering fast speeds for gaming PCs and PS5, but uses QLC NAND, potentially impacting long-term durability. The context determines if it's strong steel or a fast-but-budget drive.
Chemical Composition and Mechanical Property
|
Grade |
|
Chemical composition % MAX |
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|
|
C |
Si |
Mn |
P |
S |
B |
Cr |
Cu |
Mo |
Nb |
Ni |
Ti |
|
|
|
S690Q |
|
0.22 |
0.86 |
1.8 |
0.03 |
0.017 |
0.006 |
1.6 |
0.55 |
0.74 |
0.07 |
2.1 |
0.07 |
|
|
|
Mechanical properties MIN |
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|
|
Yield strength (Mpa) |
Tensile strength (Mpa) |
Elongation |
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|
TH(MM) |
>3≤50 |
>50≤100 |
>100≤150 |
>3 ≤50 |
>50≤100 |
>100≤150 |
14 |
|||||||
|
|
690 |
650 |
630 |
770-940 |
760-930 |
710-900 |
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Applications
Heavy Machinery:
Excavators, loaders, bulldozers, drilling rigs, mining equipment.
Lifting & Cranes:
Mobile cranes, offshore cranes, lifting equipment.
Infrastructure:
Bridges, high-rise buildings, large-scale steel constructions, wind turbine supports.
Offshore:
Oil & gas platforms, marine structures.
Defense:
Military vehicles, defense equipment.
Advantages
High Strength-to-Weight Ratio:
Enables lighter, thinner structures without compromising safety, reducing material and transport costs.
Cost-Effective:
Material savings and long-term durability offer good value.
Excellent Weldability:
Can be welded without preheating (depending on conditions) and forms strong joints, conforming to EN 1011-2 standards.
High Toughness:
Good performance under impact and low-temperature conditions (especially S690QL variant).
Versatility:
Suitable for various heavy-duty and dynamic applications.
Sustainability:
Reduces material use and transportation energy, lowering carbon footprint.
Fatigue Resistance:
Withstands repeated stress cycles well.
For more details about GNEE's steel products, contact us at beam@gneesteelgroup.com. We look forward to working with you.
What is S690Q steel?
S690Q is a high-strength quenched and tempered structural steel grade specified in standards like EN 10025-6, typically used in heavy engineering, crane booms, and offshore structures where high yield strength and good toughness are required.
What are the key mechanical properties of S690Q?
S690Q is characterized by a minimum yield strength of approximately 690 MPa, good tensile strength, and improved toughness compared to lower-strength structural steels, achieved through quenching and tempering.
What is the typical chemical composition range for S690Q?
S690Q generally contains low carbon for weldability, along with manganese, chromium, molybdenum, and often nickel or boron to enhance hardenability and strength while maintaining toughness.
What is the difference between S690Q and S690QL?
S690Q and S690QL are both quenched and tempered high-strength steels with similar strength levels, but S690QL offers improved low-temperature toughness (specified at lower test temperatures), making it more suitable for cold environments.
How does S690Q compare to S460Q?
S690Q has a higher minimum yield strength than S460Q, providing greater load-carrying capacity and allowing thinner sections. S460Q is easier to form and weld in some cases and is used where very high strength is not required.
How does S690Q compare to Q690 ?
S690Q (European EN 10025-6) and Q690 (Chinese GB/T) are both 690 MPa-grade high-strength steels, but they differ in specific standard requirements, including toughness testing, chemical composition limits, and optional supplementary requirements.
How does S690Q compare to A514 (ASTM)?
S690Q and A514 are both quenched and tempered high-strength steels for structural applications, but they follow different standards (EN vs ASTM). A514 often has higher toughness requirements at lower temperatures and may have different chemistry and weldability recommendations depending on the grade.
What are the common applications of S690Q steel?
S690Q is commonly used in crane booms, mobile crane structures, heavy machinery frames, offshore platforms, high-rise building structures, and other applications requiring high strength and good toughness.
What welding considerations apply to S690Q?
S690Q can be welded, but preheating and interpass temperature control are often necessary to prevent hydrogen-induced cracking, especially in thicker sections. Low-hydrogen welding consumables and proper post-weld heat treatment may also be recommended.
What heat treatment is used to produce S690Q?
S690Q is produced by quenching (rapid cooling) to form a hard microstructure, followed by tempering (reheating to a lower temperature) to reduce hardness, improve toughness, and achieve the desired combination of strength and ductility.