High Strength Steel Plate---S690QL1

S690QL1 is a high‑strength quenched and tempered steel with good toughness and weldability, used in heavy‑duty machinery and structures where strength and reliability under stress are required.

S690QL1 Steel Plate Specifications

Steel Standard: EN10025

Grade: 130 KSI, 140 KSI, A514, A710, TMCP 100 KSI, RQT 701, S690QL1, S690QL, S690Q, S890QL1, S890QL, S890Q , S960QL, Weldox 700, WELTEN 780E

Thicknesses: 12-60mm

Widths: 1500-3500mm

Lengths: 1500-3500mm

Standard: ASTM A514/A514M-13

Delivery State:Quenched and Tempered

Packing: Standard seaworthy package

S690QL1 Grade Designation

S = Structural Steel

690 = minimum yield strength (MPa)

Q = Quenching & Tempering

L1= Lower notch toughness testing temperatures to -60ºC

Equivalent Grades Of S690QL1 Structural Steel Plate

Chemical Composition for S690QL1 Steel Plate

Mechanical Properties for S690QL1 Steel Plate

S690QL1 Steel Plate Notch Impact Energy

Equivalent Grades Of Grade S690QL1 (1.8988)

processing

Cutting

Flame or plasma cutting is commonly used. Proper edge preparation is needed to avoid cracking during subsequent welding.

Machining

S690QL1 can be machined, but due to its high strength, harder tooling and lower cutting speeds are often required compared to ordinary structural steels.

Bending and Forming

It can be cold-formed to some extent, but the high strength means higher forming forces are needed. For complex shapes, controlled heating may be considered to reduce springback and avoid cracking.

Welding

Welding is possible, but preheating and strict control of interpass temperatures are usually necessary to prevent hydrogen-induced cracking. Low-hydrogen welding consumables are recommended.

Heat Treatment

As a quenched and tempered steel, S690QL1 already has a refined microstructure. Post-weld heat treatment may be applied in some critical applications to relieve residual stresses and maintain toughness.

Handling and Fabrication

Care should be taken to minimize excessive mechanical damage and avoid unnecessary heating, which could alter the material's strength and toughness properties.

applications 

Construction Machinery

S690QL1 is widely used in excavators, loaders, bulldozers, and other heavy equipment. It is commonly found in booms, arms, chassis, and other critical structural parts that must withstand heavy loads, dynamic forces, and repeated impact during operation.

Mining and Quarry Equipment

The steel is used in dump truck bodies, hoppers, and structural components exposed to abrasive materials and harsh conditions. Its high strength helps reduce overall weight while maintaining durability and resistance to wear.

Cranes and Lifting Equipment

S690QL1 is a preferred material for crane booms, outriggers, and support structures in mobile and port cranes. Its combination of strength and toughness ensures reliable performance under heavy lifting loads and dynamic stresses.

Large-Scale Steel Structures

It is used in bridges, industrial buildings, and tower structures where high load-bearing capacity and reduced weight are important. The material allows engineers to design more efficient structures without compromising safety.

Specialized Vehicles

S690QL1 is found in fire trucks, concrete pump trucks, aerial work platforms, and other specialized vehicles. It helps create strong, stable, and lightweight platforms and arms that are essential for their operation.

Offshore and Energy Applications

In some cases, it is used in offshore platforms, wind turbine components, and other energy-related structures that require high strength and good toughness in challenging environments.

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What is the application of S690QL1 in construction?

In construction, S690QL1 is used for high-rise building steel structures, bridges, and crane beams. Its high strength reduces material weight, optimizing structural design.

Can S690QL1 be used in offshore environments?

Yes, S690QL1 can be used in offshore environments with proper corrosion protection. It resists harsh marine conditions when coated or galvanized, ideal for offshore platforms.

What is the impact toughness of S690QL1?

S690QL1 has good impact toughness, with a minimum Charpy V-notch impact energy of 30 J at -20°C. It maintains toughness in low-temperature environments, avoiding brittle fracture.

Is S690QL1 a quenched and tempered steel?

Yes, S690QL1 is a quenched and tempered (Q&T) steel. The Q&T process enhances its strength and toughness, making it superior to ordinary structural steels in performance.

What is the maximum plate thickness of S690QL1 available?

S690QL1 is available in plate thicknesses up to 150 mm. Thicker plates retain good mechanical properties due to precise heat treatment control.

Can S690QL1 be machined easily?

S690QL1 has moderate machinability. High-speed steel or carbide tools are recommended, with appropriate cutting speeds and feeds to handle its high strength.

What is the density of S690QL1?

The density of S690QL1 is approximately 7.85 g/cm³, the same as standard carbon steels. This allows for easy weight calculation in structural design.

What standards does S690QL1 comply with?

S690QL1 complies with EN 10025-6, the European standard for high-strength quenched and tempered structural steels, ensuring consistent quality and performance.

Can S690QL1 be heat treated further?

Further heat treatment of S690QL1 is not recommended, as it may alter the original Q&T properties. It is used in its as-delivered condition for optimal performance.

What is the corrosion resistance of S690QL1?

S690QL1 has moderate corrosion resistance, similar to carbon steels. For harsh environments, protective coatings like paint or galvanization are required to prevent rust.