Chemical composition differences between the A36 steel suppliers, Q345 steel grades (Q345A / Q345B / Q345C / Q345D / Q345E):Q345A steel：C≤0.20, Mn ≤1.70, Si≤0.50, P≤0.035, S≤0.035； Q345B steel：C≤0.20, Mn ≤1.70, Si≤0.50, P≤0.035, S≤0.035； Q345C steel：C≤0.20, Mn ≤1.70, Si≤0.50, P≤0.030, S≤0.030, Al≥0.015； Q345D steel：C≤0.18, Mn ≤1.70, Si≤0.50, P≤0.030, S≤0.025, Al≥0.015； Q345E steel：C≤0.18, Mn ≤1.70, Si≤0.50, P≤0.025, S≤0.020, Al≥0.015； All the Q345 steel grades contain Nb≤0.07, V≤0.15, Ti≤0.20, Cr≤0.30, Ni≤0.012, Mo≤0.10.
Structural steel plate A36 steel suppliers discount online 15*2320*9790, 12.5*2060*7410, 12*1540*5390, 12.5*1730*14930, 11*3910*6450, 17*2000*10650, 13.5*1905*8920, 6*1730*7840, 12.5*3790*8900, 12.5*3600*8810, 32*1301*6600, 12.5*1530*8000, 12*1590*9770, 16*2300*14200, 14.5*3690*10960, 20*2100*8950, 6*1800*4500, 14*1700*9200, 12.5*1790*15910, 5*1829*6096, 13*3200*10700, 9*1301*4000, 11*1510*5370, 12.5*1730*14770, 12.7*1829*6096, 13*2970*9800, 13.5*2890*5350, 12.5*2145*10360, 14*1860*13880, 24*2715*7800.
Steel plate that has undergone acid pickling will oxidise once exposed to the atmosphere, especially when conditions are of moderately high humidity. Therefore a thin layer of lubrication or a waterproof coating is added to protect the material from moisture in the air. This film must be removed before any fabrication, painting or plating processes take place.
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