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The chemical composition of Q690E steel plate is mainly composed of carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S) and other elements, and also contains a certain amount of niobium (Nb) and vanadium (V). , titanium (Ti), chromium (Cr), nickel (Ni), copper (Cu), nitrogen (N), molybdenum (Mo), boron (B) and aluminum (Al) and other alloying elements. The content and proportion of these elements are carefully designed and controlled, giving Q690E steel plate high strength, high toughness, good welding performance and processing performance.

Specifically, carbon is one of the most important elements in Q690E steel plates, and its content is controlled at a low level to ensure the strength and toughness of the steel plates. Silicon and manganese are common alloying elements that can increase the strength and hardness of steel while maintaining good plasticity and toughness. Phosphorus and sulfur are common impurity elements, and their content is strictly controlled to ensure stable performance of steel plates.

In addition, niobium and vanadium can improve the strength and toughness of steel, titanium and chromium can improve the corrosion resistance of steel, nickel and copper can improve the low-temperature toughness of steel, and nitrogen and boron can refine the structure of steel and improve its strength and toughness.

Niobium (Nb) and vanadium (V) play important roles in Q690E steel plates. They improve the strength and toughness of the steel plates in specific ways, allowing Q690E steel plates to meet various high-demand application scenarios.

First of all, niobium plays a role in refining grains in steel and preventing the growth of austenite grains. This helps increase the strength and toughness of the steel. At the same time, niobium can also form carbides, which exist as precipitates in steel, further enhancing the strength of the steel. In addition, niobium can also increase the recrystallization temperature of steel, allowing the steel plate to maintain good strength at high temperatures.

Secondly, vanadium mainly forms stable compounds with carbon and nitrogen in steel. These compounds can serve as precipitation strengthening phases, significantly improving the strength and toughness of steel. In addition, vanadium can also refine the grain structure of steel and reduce its brittleness, thereby improving its toughness. At the same time, vanadium can also improve the welding performance of steel and reduce the sensitivity of welding cracks.

Therefore, by rationally adding alloying elements such as niobium and vanadium, Q690E steel plate can obtain excellent strength and toughness, making it widely used in various heavy machinery and construction fields. It should be noted that the amount of alloying elements added needs to be precisely controlled to ensure the balance and stability of the steel plate properties. Adding too much or too little may cause the performance of the steel plate to decrease and fail to meet the usage requirements.

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