The comprehensive mechanical properties of A514 grade Q quenched and tempered steel, Q345B steel plate are good, the low temperature performance is acceptable, and the plasticity and weldability are good. Q345B steel is used for medium and low pressure containers, oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other structures that bear dynamic loads, mechanical parts, building structures, general metal structural parts. Plate Q345B is the most versatile and the most used pressure special steel plate for container.
A few days ago, the relevant person in charge of China National Railway Group Co., Ltd. introduced that since the 18th National Congress of the Communist Party of China, 14 concentrated contiguous poverty-stricken areas, including old and poor, have completed a total of 3.3 trillion yuan in railway infrastructure investment, accounting for 78% of the total railway infrastructure investment; 36,000 kilometers of new lines were put into operation (20,000 kilometers of high-speed rail), accounting for 83% of the new lines put into operation in the country. Up to now, the railway network and 154 trackless stations on the whole road cover about 600 national-level poverty-stricken counties, accounting for 73% of the country's 832 poverty-stricken counties.
High quality structural steel thick plate product A514 grade Q quenched and tempered steel dimension(mm): 40*2300*12000, 50*1780*7000, 16*2300*12000, 50*2500*10120, 55*1800*11900, 25*2300*12000, 50*2500*10060, 60*2500*8400, 60*2100*10000, 80*1920*6000, 130*2200*10000, 140*2200*10000, 55*1800*11550, 110*2320*8100, 40*1900*7350, 150*2200*10000, 45*2200*9000, 60*2500*8300, 40*2300*12000, 90*2440*12400, 125*1920*5000.
As the thickness and hardness of A514 grade Q quenched and tempered steel increase, the tendency to crack at the cutting edge increases. In order to prevent the A514 grade Q quenched and tempered steel from cutting cracks, preheating should be carried out before A514 grade Q quenched and tempered steel cutting. Special attention should be paid to preheating to make the entire A514 grade Q quenched and tempered steel interface evenly heated to avoid local overheating in the area contacting the heat source. If the whole A514 grade Q quenched and tempered steel cannot be preheated, the partial preheating method can be used instead.
