Welcome to Shandong Zhishang Steel Co., Ltd.
Welcome to Shandong Zhishang Steel Co., Ltd.
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Q390B steel plate is a kind of low-alloy high-strength structural steel, which not only has the characteristics of high-strength steel, but also belongs to the category of low-carbon steel. Q390B, with its excellent mechanical properties and wide range of applications, has become one of the indispensable materials in modern industry.
Q390B has a high yield strength, which means that it can maintain the stability of the structure when subjected to external forces and is not prone to plastic deformation. In addition, it also has good fatigue resistance, which gives it a long service life under cyclic loads. Q390B also exhibits high toughness and a low brittle transition temperature, maintaining good toughness even at low temperatures and reducing the risk of fracture.
In addition to mechanical properties, Q390B also has good cold forming properties and welding properties. It is easy to process into various shapes and sizes of components, and can maintain its excellent performance under different welding processes. This gives the Q390B greater flexibility and adaptability in the manufacturing process. In addition, Q390B also has good corrosion resistance and certain wear resistance, which can be used in harsh environments for a long time without being affected by corrosion and wear.
The implementation standard of Q390B steel plate is GB/T1591-2018, which specifies the requirements of its chemical composition, mechanical properties, smelting methods and delivery status. Depending on the application requirements, Q390B steel sheet can be delivered in hot rolled, controlled rolled, normalized, normalized and tempered, hot mechanical rolled (TMCP) or hot mechanical rolled and tempered state. These different delivery states enable Q390B steel plates to adapt to a variety of different processing processes and application scenarios.
When the steel plate is required to have thickness direction performance, the Q390B steel plate will be added to the symbol Z15, Z25, Z35 representing the thickness direction performance level after the grade. These symbols indicate the level of performance of the steel plate in the direction of thickness, ensuring its reliability and safety in a specific application.
The thickness range of Q390B steel plate is wide, and the thickness range can be produced from 8mm to 700mm, where the material performance is guaranteed to 400mm. The steel plate can also be zero cut according to the need to cut into shaped parts to meet the needs of different projects. The smelting method of Q390B steel plate includes converter or electric furnace smelting, and can be refined outside the furnace if necessary to ensure the purity and uniformity of the steel.
Regarding the size, shape, weight and allowable deviation of Q390B steel plate, they shall comply with the provisions of the corresponding standard GB/T709. This standard specifies the geometric parameters and tolerance range of the steel plate to ensure the consistency and interchangeability of the product.
Q390B steel plate is widely used in power tower, all kinds of lifting cranes, heavy vehicles, oil derrick, high temperature fan, large shovel, dump truck and drilling rig, coal mine hydraulic support, steel structure and other fields. Its excellent performance and reliability make it the material of choice in these fields, providing a solid foundation and guarantee for all types of engineering.
The main materials of Marine steel plates are carbon steel and alloy steel.
First, carbon steel ship plate
Carbon steel mainly refers to ordinary steel with carbon content between 0.05-2.0%. Carbon steel ship plate is widely used in various types of ships, which is characterized by high strength, good toughness, good weldability and low cost. In addition, the reliability of carbon steel materials is high and can withstand strong hot and cold deformation, which is necessary for Marine steel plates.
The main disadvantage of carbon steel ship plates is that they are susceptible to corrosion by seawater and air, so special anti-corrosion treatment is required, including painting and the use of anti-rust coatings. At the same time, the service life of the carbon steel ship plate is also relatively short, and it needs to be replaced frequently.
Second, alloy steel ship plate
Compared with carbon steel, alloy steel ship plate has lower carbon content and adds a certain proportion of alloying elements, such as manganese, silicon, chromium, tungsten, molybdenum, etc., to increase the strength and corrosion resistance of steel. Alloy steel ship plates are more resistant to corrosion and last longer than carbon steel ship plates.
Alloy steel ship plate has the following characteristics:
1. High strength: The addition of alloying elements can improve the strength of steel and enhance the carrying capacity.
2. Good corrosion resistance: the alloy elements such as chromium not only increase the strength of the steel, but also form a dense chromium oxide film, which can prevent further corrosion.
3. Good cold working performance: compared with ordinary steel, alloy steel can better withstand strong hot and cold deformation, and it is not easy to produce surface cracking, fracture and other phenomena.
The choice of Marine steel plate material depends on many factors such as the ship's use environment, transportation volume and economic cost. Factors such as physical and chemical properties, corrosion resistance, cost and processing difficulty need to be considered when selecting materials.
304 stainless steel plate and Q345 carbon steel plate can be welded. The welding of stainless steel and Q345 belongs to the welding between low carbon steel and austenitic stainless steel in this kind of dissimilar steel welded joint, due to its working conditions have intergranular corrosion and stress corrosion problems, usually choose E309 type welding material, but when the welding joint is in a higher temperature environment (design temperature ≥315℃), In order to prevent the migration of carbon during the working process, welding materials with a high nickel alloy content (such as InCONel 182 electrode, etc.) are usually used.
