Angle steel production process on the mechanical properties of steel pipes
General angle steel production process can be divided into cold-drawn and hot-rolled two kinds, cold-rolled angle steel production process is generally more complex than hot-rolled, the billet is first three-roll continuous rolling, extrusion after sizing test, if the surface does not respond to cracks after the round tube to be cut by the cutter, cut into lengths of about a meter of billet. Then enter the annealing process, annealing to be pickled with acidic liquid, pickling should pay attention to the surface whether there is a large number of blisters produced, if there is a large number of blisters produced indicates that the quality of the steel pipe fails to meet the appropriate standards. Appearance of cold rolled angle steel is shorter than hot rolled angle steel, cold rolled angle steel wall thickness is generally smaller than hot rolled angle steel, but the surface looks brighter than thick walled angle steel, the surface does not have too much roughness, and the caliber does not have too much burr.
The delivery status of hot rolled angle steel is generally hot rolled state after heat treatment for delivery. Hot rolled angle steel after quality inspection should be strictly hand selected by the staff, after quality inspection, the surface should be coated with oil, and then followed by a number of cold drawing experiments, hot rolled treatment should be punched through the experiment, if the perforation dilation is too large should be straightened and corrected. After straightening and then transferred by the transmission device to the flaw detection machine for flaw detection test, after labeling, specification arranging and then placed into the warehouse.
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