What is S690QL1 equivalent to？

What is S690QL1 equivalent to?

S690QL1 (EN 10025-6) is a high-strength, quenched & tempered structural steel, with close equivalents including German EStE690V (1.8988), proprietary grades like Weldox 700, and similar performance steels like ASTM A514/A709 Gr 100, though direct substitution requires engineering checks. It offers excellent weldability and strength, used in heavy machinery, construction, and other demanding applications needing light weight and high load capacity.

S690QL1 is a European standard, quenched and tempered (Q+T) high-strength structural steel (S) with a minimum yield strength of 690 MPa. The "Q" refers to the specific delivery condition-Quenched and Tempered-a dual-stage heat treatment process that meticulously refines the grain structure of the steel to achieve a balance of extreme hardness and essential ductility.

Most importantly, the "L1" suffix distinguishes this grade from its counterparts like S690Q or S690QL. While standard grades are tested for impact energy at 0°C or -40°C, S690QL1 is rigorously tested at the ultra-low temperature of -60°C. This specific testing ensures that the material maintains its toughness and resists brittle fracture even in the most hostile environments on Earth, such as the Arctic or high-altitude alpine regions.

The mechanical prowess of S690QL1 is the primary reason for its widespread adoption across heavy-duty industrial sectors. With a tensile strength ranging from 770 to 940 MPa, this steel provides the necessary leverage for equipment that must endure immense stress. In the realm of heavy lifting and mobile crane manufacturing, S690QL1 has become the gold standard. Modern cranes require telescopic booms that can reach incredible heights while carrying massive loads; using S690QL1 allows manufacturers to reduce the dead weight of the boom itself, thereby increasing the effective lifting capacity and stability of the machine.

Key Characteristics:

High Strength: Minimum yield strength of 690 MPa (megapascals).

Heat Treatment: Produced via quenching and tempering (Q+T) for superior mechanical properties.

Low-Temperature Toughness: Excellent impact resistance down to -60°C, crucial for cold climates.

Good Weldability: Low sulfur (S) and phosphorus (P) content ensures good welding performance.

Fine Grain: Often produced with controlled rolling for a fine grain structure, enhancing strength.

Decoding the Name:

S: Structural Steel.

690: Minimum Yield Strength in MPa (690 N/mm²).

QL: Quenched and Tempered, with Low-temperature impact toughness (typically -40°C).

QL1: Quenched and Tempered, with Enhanced Low-temperature toughness (typically -60°C).

Common Applications:

Construction: Bridges, offshore platforms, heavy-duty structures.

Machinery: Cranes (booms), mining equipment, dump truck bodies, agricultural machinery.

Vessels: Pressure vessels, storage tanks.

Standards:

EN 10025-6:2004 (European standard) for flat products of high yield strength structural steels.

S690QL1 / 1.8988 is its equivalent number.

What 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.

What 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.

What 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

Equivalent grades of steel S690QL1 (1.8988)

Chemical composition % of steel S690QL1 (1.8988): EN 10025-6-2004

Mechanical properties of steel S690QL1 (1.8988)

S690QL1 Steel Plate Notch Impact Energy

1 What is the P number of S690QL1?

The P-number for S690QL1, a high-strength structural steel, isn't a single universal value but generally falls into a category recognized by welding codes like ASME, often grouped with other quenched & tempered (Q&T) alloy steels, but specific P-numbers are assigned by standards for welding qualifications, with S690QL1 (or its close cousins like S690QL) usually classified under a P-Number 5 (P-5) or similar group for low-alloy steels.

2 What 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.

3 What precautions should be taken when welding S690QL1?

When welding S690QL1, critical precautions involve strict control over heat input, using low-hydrogen consumables, and applying appropriate preheating and interpass temperatures (e.g., 150-200°C preheat) to prevent hydrogen cracking and maintain weld quality, alongside standard PPE (flame-resistant clothing, eye/ear protection) and good ventilation. The high strength of S690QL1 demands careful process control, especially limiting heat input (t8/5 time) and ensuring proper cooling to avoid brittle weld metal and cracking.

4 What 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.

5 What 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.

6 What 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.

7 Is S690QL1 carbon steel?

Yes, S690QL1 is a type of high-strength, low-alloy (HSLA) carbon steel, specifically a quenched and tempered structural steel (EN 10025-6 standard) designed for heavy engineering, featuring excellent low-temperature toughness and high yield strength (minimum 690 MPa). While it's fundamentally carbon steel, its properties are enhanced by controlled alloying elements like manganese, silicon, nickel, chromium, and molybdenum, along with microalloying additions (niobium, vanadium, titanium) for better performance, making it a superior grade for demanding structural applications.

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