What is the composition of the low alloy plate
When buying steel plates, we know that there are so many types of steel plates, among which there are low alloy plates, what is low alloy plate? This is a question many people ask when buying steel plates. Low alloy plate is a kind of high strength, low alloy steel, it has a wide range of applications in many fields.
Low alloy plate is actually a general term, referring to the alloy content of less than 3.5% steel collectively. The general market is said to be low alloy plate is Q345B board. Low alloy plate has the following properties, one is high strength: generally its yield strength is more than 300MPa; The second is high toughness: the required elongation is 15% to 20%, and the impact toughness at room temperature is greater than 600kJ/m ~ 800kJ/m. For large welded components, high fracture toughness is also required; Third, good welding performance and cold forming performance; Fourth, low cold and brittle transition temperature; Fifth, good corrosion resistance.
What are the components of the low alloy plate? First, low carbon: due to the high requirements of toughness, weldability and cold forming performance, its carbon content does not exceed 0.20%; The second is to add the alloy element mainly manganese; The third is to add niobium, titanium or vanadium and other auxiliary elements: a small amount of niobium, titanium or vanadium in the steel to form a fine carbide or carbon nitride, which is conducive to obtaining fine ferritic grains and improving the strength and toughness of steel; In addition, adding a small amount of copper (≤0.4%) and phosphorus (about 0.1%) can improve the corrosion resistance. Adding a small amount of rare earth elements can desulfurization and degassing, purify steel, improve toughness and process performance.
Low alloy plate is a kind of high strength, low alloy steel, with outstanding mechanical properties, good corrosion resistance and good plasticity, widely used in machinery manufacturing, construction, energy, chemical and other fields, the purchase of low alloy plate, need to choose different grades and specifications according to specific needs.
