What is the material of S690Q steel plate?

S690Q Steel Plate is a high-strength and high-toughness structural steel plate, with implementation standards of EN10025-6 and GB/T16270-2009, corresponding to the Chinese designation Q690E. S690Q steel plate has excellent mechanical properties and corrosion resistance.

Chemical Composition

The chemical composition of S690Q steel plate mainly includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S) and other elements, as well as a certain amount of alloying elements such as nickel (Ni), chromium (Cr), molybdenum (Mo), copper (Cu), niobium (Nb), vanadium (V), titanium (Ti) and so on. The specific content ranges of each element are as follows:

Carbon (C): ≤0.2%
Silicon (Si): ≤0.8%
Manganese (Mn): ≤1.7%
Phosphorus (P): ≤0.025%
Sulfur (S): ≤0.015%
Nickel (Ni): ≤2%
Chromium (Cr): ≤1.5%
Other alloy elements: such as molybdenum (Mo) ≤0.7%, copper (Cu) ≤0.5%, niobium (Nb) ≤0.06%, vanadium (V) ≤0.12%, titanium (Ti) ≤0.05%, etc.

Mechanical Properties

S690Q structural steel plate has excellent mechanical properties, mainly including:
Yield strength: σ0.2 ≥690MPa (some products can even reach more than 650MPa)
Tensile strength: σb is between 770-940MPa
Elongation: ≥14%
Impact toughness: It exhibits good performance at different temperatures, such as at -20℃, with an impact toughness value greater than 30J (some data also indicate that it is greater than 34J); At -40℃, the impact toughness value is greater than 27J.

Features and Advantages

High strength: The yield strength and tensile strength of S690Q steel plate are much higher than those of ordinary carbon structural steel, which can withstand greater loads and stresses.
High toughness: not only high strength, but also good toughness, which can effectively absorb energy when bearing heavy loads and impacts, reducing the risk of brittle fracture.
Low temperature resistance: It can maintain good toughness and strength under low temperature conditions, making it suitable for use in cold regions.
Anti-fatigue: It has good anti-fatigue performance, can withstand repeated stress cycles, and reduce the occurrence of fatigue cracks.
Corrosion resistance: After special anti-corrosion treatment, S690Q steel plate has good corrosion resistance, which can resist oxidation and corrosion and extend its service life.
Good welding performance: S690Q steel plate can be connected and fixed with other steels or structures through various welding methods, which is convenient for construction and use.

Application area 

S690Q High strength steel plate is widely used in many fields due to its high strength, high toughness, and good welding performance:

Heavy machinery: used for manufacturing components and structural parts of heavy machinery, such as lifting machinery and mining machinery.

Bridge engineering: In bridge engineering, S690Q steel plates can be used to manufacture key load-bearing components of bridges, improving the load-bearing capacity and safety of bridges.

Building structure: In high-rise buildings, large stadiums and other building structures, S690Q steel plates can be used to manufacture key load-bearing components, improving the overall stability and safety of the building.

Petrochemical industry: S690Q steel plate is also used in the manufacturing of key materials such as oil storage tanks and refining equipment, and its high temperature performance and corrosion resistance meet the special needs of the petrochemical industry.

Shipbuilding: In the field of shipbuilding, S690Q steel plate can be used to manufacture structural parts, decks, etc. of ships.

Delivery Status and Dimensions

S690Q steel plates are usually delivered in the quenched and tempered (quenched + tempered) state, and the delivery state can also be specified according to technical requirements. Its size can be customized according to demand, with a common thickness range of 10-200mm, and the width and length can also be negotiated according to specific needs.