ลักษณะองค์ประกอบของแผ่นเหล็กอัลลอยต่ำความแข็งแรงสูง

ลักษณะองค์ประกอบของเหล็กกล้าความแข็งแรงสูงอัลลอยด์ต่ำเป็นคาร์บอนต่ำ_{ห้องสุขา}น้อยกว่าหรือเท่ากับ 0. 20%, อัลลอยด์ต่ำและปริมาณทั้งหมดขององค์ประกอบการผสมคือ_WMC<3%. The low-carbon content is to meet the requirements of plasticity, toughness, weldability and cold deformation of steel used in engineering structural parts, and a small amount of alloying elements mainly Mn is added to achieve the purpose of improving mechanical properties. Low-alloy high-strength steel is mainly added with Mn as the main element, which is in line with the resource characteristics of China. Mn not only has a significant strengthening effect on ferrite, but also can reduce the cold and brittle temperature of steel, and increase the number of pearlite in steel, further improving the strength, in order to further improve and enhance the performance of steel. Trace amounts of V, Ti, Nb, AI and other fine grain elements are also added, which not only further improves the strength, but also improves the toughness of the steel. This type of steel is sometimes added with rare earth elements Re to eliminate harmful impurities in the steel, improve the form and distribution of inclusions, and reduce its cold brittleness. A small amount of alloying elements have a significant effect on improving and enhancing the mechanical properties of steel, such as adding only 1% Mn in Q235, it becomes Q345 steel, and its strength is increased by nearly 40% to 345 MPa, and on the basis of 16Mn, adding 0.04~0.12% vanadium becomes Q390 steel, and the strength is increased from 350 MPa to 390 MPa.