What is the performance of Q690D high strength steel plate?

Q690D carbon steel is a high-strength welded structural steel. Among them, Q represents the yield strength, 690 represents the yield strength value, and D represents the grade of the steel plate (-20°C low temperature impact). Q690D steel has excellent properties such as high strength, high toughness, good weldability and corrosion resistance, and Q690D steel is widely used in coal mining machinery and engineering machinery, such as hydraulic supports, port cranes, and flatbed transport vehicles.

Q690D steel plate surface quality requirements: The surface of the steel plate is not allowed to have defects such as cracks, bubbles, scarring, folding and doping that are harmful to use. There must be no delamination on the sides of the steel plate.

The chemical composition of Q690D steel plate mainly includes carbon, silicon, manganese, phosphorus, sulfur and other elements. Among them, the carbon content is between 0.18%-0.26%, the silicon content is between 0.15%-0.35%, the manganese content is between 0.70%-1.10%, the phosphorus content is between 0.02%-0.08%, and the sulfur content is 0.01 Between %-0.05%. The addition of these alloying elements significantly improves the strength, toughness, corrosion resistance and hardenability of steel.

Q690D high strength steel plate production process

The production process of Q690D steel plate mainly includes steelmaking, continuous casting, rolling and heat treatment. In the steelmaking process, it is necessary to control the content of carbon, phosphorus, sulfur and other elements, and add appropriate amounts of alloying elements. During the continuous casting process, the purity and crystallization quality of molten steel must be ensured. During the rolling process, the steel plate can achieve the required mechanical properties and thickness by controlling parameters such as rolling temperature, rolling speed, and reduction. Finally, through the heat treatment process, the residual stress and structural defects inside the steel plate are eliminated, further improving its performance.

Application of Q690D carbon high strength steel plate

Q690D steel plate is widely used in various engineering fields due to its advantages such as high strength, high toughness and good welding performance. In bridge engineering, Q690D steel plates can be used to manufacture structural parts such as main beams, cross beams, and longitudinal beams to improve the load-bearing capacity and seismic performance of the bridge. In the construction field, Q690D steel plates can be used to manufacture support and load-bearing components of high-rise buildings, large factories, sports venues and other building structures. In ship engineering, Q690D steel plates can be used to manufacture structural components such as hulls and cabins to improve the safety and durability of ships. In vehicle engineering, Q690D steel plates can be used to manufacture structural components of cars, trains, construction machinery and other vehicles to improve the vehicle's load-bearing capacity and service life.