A709 grade 50W low alloy steel sheet discount steel plate and sheet (size mm) supply: 10*2200*12000, 18*2000*000, 14*2000*12000, 22*2500*1000, 12*2000*11000, 16*2500*10000, 14*2000*11000, 25*2000*10000, 12*2000*12000, 14*2500*10000, 14*2000*10000, 20*2500*10000, 12*1800*10000, 16*2200*000, 14*2000*9000, 22*2200*1000, 12*1800*9000, 16*2000*10,000, 16*1800*10000, 14*1800*9000, 20*2000*10000, 22*2200*10000, 30*2500*10000.
As the thickness and hardness of A709 grade 50W low alloy steel sheet increase, the tendency to crack at the cutting edge increases. In order to prevent the A709 grade 50W low alloy steel sheet from cutting cracks, preheating should be carried out before A709 grade 50W low alloy steel sheet cutting. Special attention should be paid to preheating to make the entire A709 grade 50W low alloy steel sheet interface evenly heated to avoid local overheating in the area contacting the heat source. If the whole A709 grade 50W low alloy steel sheet cannot be preheated, the partial preheating method can be used instead.
The main function of boron in A709 grade 50W low alloy steel sheet and so on steel is to increase the hardenability of steel, so as to save other rare and precious metals, such as nickel, chromium and molybdenum. For this purpose, the boron content is generally regulated in the range of 0.001% - 0.005%. It can replace 1.6% nickel, 0.3% chromium or 0.2% molybdenum. It should be noted that molybdenum can prevent or reduce temper brittleness, while boron slightly promotes temper brittleness, so molybdenum can not be completely replaced by boron.
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