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Henan BEBON international co.,ltd located in zhengzhou ,henan province of china. Since it was established in 2008, Henan BEBON has earned an outstanding reputation for its professional exporting shipbuilding steel.About the products,we mainly specialized in steel products for shipbuilding which have been approved by some authoritative classification societies,likeLR,BV,ABS,DNV,GL and so on . Besides, we have three big warehouses--Zhengzhou,Tianjin and shanghai.
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The microstructure of Q690D steel plate is mainly composed of ferrite and pearlite

The main components of Q690D steel plate include iron, carbon, silicon, manganese, phosphorus, sulfur and other elements. Among them, carbon is one of the main elements that affects the strength and hardness of steel. Its content is between 0.12% and 0.20%, which makes Q690D have high strength and hardness. Silicon and manganese are important elements that improve the toughness and plasticity of steel. The silicon content is usually between 0.15% and 0.35%, and the manganese content is between 0.70% and 1.10%. In addition, although the content of phosphorus and sulfur is low, they have a certain impact on the toughness and weldability of steel.

In addition to the above elements, Q690D also contains a certain amount of alloying elements, such as chromium, molybdenum and vanadium, which can further improve the corrosion resistance and high temperature strength of steel. At the same time, the microstructure of Q690D steel plate is mainly composed of ferrite and pearlite, of which ferrite is a soft phase and pearlite is a hard phase. This dual-phase structure makes Q690D have good toughness and strength at the same time.

The dual-phase structure of pearlite and ferrite refers to the two types of structures that exist simultaneously in steel: pearlite and ferrite.

Pearlite is a mechanical mixture composed of ferrite and cementite. It usually contains 88% ferrite and 12% iron carbide. The overall carbon content is about 0.8%. It is formed by the eutectoid reaction of austenite with a carbon content of about 0.8% during extremely slow cooling and the simultaneous precipitation of ferrite and ferric carbide. Pearlite has high hardness and strength, its grains are small and tightly arranged, the grain boundaries are clearly visible, and the structure is stable, which can improve the fatigue resistance and corrosion resistance of metal materials.

Ferrite is an interstitial solid solution in which carbon is dissolved in α-Fe. Its carbon-dissolving ability is very low, and it can only dissolve 0.0008% carbon at room temperature. Ferrite in steel exists in the form of flakes, blocks, needles and networks. It has good plasticity and toughness and can improve the impact toughness and plasticity of metal materials.

In steel, the ratio of pearlite to ferrite has an important influence on its properties. This dual-phase structure combines the high hardness and strength of pearlite with the good plasticity and toughness of ferrite, giving the material unique comprehensive properties. In practical applications, by controlling the cooling rate and heat treatment process, the ratio of pearlite and ferrite can be adjusted to meet the needs of material properties in different engineering fields.