A709 Gr 50W low alloy steel sheet annealing is to heat the steel to 30 ~ 50℃ above the critical temperature, keep it in the heat treatment furnace for a period of time, and then cool it down to room temperature with the furnace. The purpose of A709 Gr 50W low alloy steel sheet annealing is to refine the grain of steel, eliminate internal stress and reduce hardness, improve cutting performance, increase toughness and plasticity, and facilitate welding and rolling processes. A709 Gr 50W low alloy steel sheet annealing can be complete annealing, incomplete annealing, stress relief annealing, isothermal annealing and spheroidizing annealing.
A709 Gr 50W low alloy steel sheet 2020 October inventory: 16*2200*12000, 10*2400*8450, 27*3510*7900, 14*2070*9060, 38*3300*13400, 30*2020*7000, 10*2400*8300, 35*2230*6000, 10*2200*8000, 8*2210*11000, 30*1600*10720, 25*2100*8400, 23.5*2950*10500, 38*3300*13400, 30*1600*10720, 8*2200*11200, 24*2500*5800, 25*2400*11600, 35*2220*10000, 21.5*1630*13480, 20*1950*9150, 80*2250*8850, 30*1600*10720, 21.5*1630*13480.
After the steel plate is produced from the original factory, it will pass through a series of transportation and storage links and then be delivered to the processing workshop. During this period of time, the steel plate surface will contact with the air continuously, which will inevitably produce a layer of oxide skin. The oxide skin is a difficulty in the treatment process. It has high melting point, is not easy to burn and dissolve, increases preheating time, reduces cutting speed. Therefore, the surface of the A709 Gr 50W low alloy steel sheet plate should be derusted before cutting.
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