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Under normal circumstances, there are only two forms of steel plates, flat or rectangular. Rolled or wider steel strips can be cut to form new steel plates. There are many types of steel plates. If they are divided according to the thickness of the steel plate, there will be thickness. Thin steel plates can be further classified.
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Quenching was Ms point temperature of the steel above the appropriate speed to slow cold cold Ms point or less, achieve superior organizational performance. Need to quench quenching medium, a common cooling medium is quenching oil, water-soluble quenching agent, water and saline and alkaline
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Welded pipe has welded joints rigid, multi-layer welding, welding metal bulky, so welded joints in high-stress state, such as the weld metal has a higher yield point, it is difficult to relaxation through its plastic deformation of welded joints of high stress