The algorithm of end face shrinkage of steel coil q235b

steel coil q235b, SS400 steel is one of the most commonly used hot rolled general structural steel. SS400 steel's mechanical properties is yield strength more than 225-235MPa, tensile strength 360-510Mpa and 340-470Mpa. For SS400 steel, the C element content is 0.2% max, the Mn element content is 1.40% max, the P element content is 0.045% max, the S element content is 0.045% max.

At the same time can reduce the hardness, improve the steel coil q235b plasticity and toughness, improve the cutting performance.Therefore, annealing is not only to eliminate and improve the tissue defects and internal stress left by the previous process, but also to prepare for the subsequent process, so annealing belongs to the steel coil q235b heat treatment of semi-finished products, also known as pre-heat treatment.

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.

Carbide forming elements Cr, Mo, W, V, Ti, etc., the steel coil q235b carbides formed with carbon are harder, more stable, finer and more dispersive than cementite, which can better play the role of second phase strengthening and fine grain strengthening.