To know Stainless steel seamless tube work
Hot rolling, extrusion, cold drawing and cold rolling of these basic types, according to the cross-section shape can be divided into tube and shaped tube, widely used is a round steel pipe, but there are some square, rectangular, semi-circular, Angle, equilateral triangle, octagonal and other profiled stainless steel pipe.
1.1, hot-rolled Stainless Steel Seamless Pipe is generally produced in the automatic rolling mill unit. The solid tube is inspected and cleared of surface defects, cut into the required length, centered on the end face of the perforation of the tube, and then sent to the heating furnace for perforation.
In the perforation at the same time continue to rotate and forward, in the roll and the role of the head, the tube gradually formed inside the cavity, said capillary. And then sent to the automatic rolling mill to continue rolling. Finally, the whole machine is the whole wall thickness, the sizing machine to achieve the specifications. The use of continuous rolling mill production of hot-rolled seamless steel pipe is a more advanced method-Stainless Steel Seamless Pipe.
1.2, if you want to get smaller and better quality seamless pipe, must use cold-rolled, cold drawn or a combination of the two methods. Cold rolling is usually carried out on a two-roll mill where the steel pipe is rolled in a ring-shaped bore formed by a variable cross-section round hole and a stationary tapered head. The cold drawing is usually carried out on a single chain or double chain type drawing machine of 0.5 to 100T.
1.3, the extrusion method is about to heat a good tube placed in a closed extrusion cylinder, perforated rods and squeeze bar with the movement, so that extrusion from the smaller die hole extrusion. This method can produce smaller diameter steel pipe.
This type of steel pipe can be divided into stainless steel seamless steel pipe and stainless steel welded pipe (with pipe) two categories, according to the different manufacturing processes can be divided into:
For the pressure of the steel pipe to be carried out by the hydraulic test to test its pressure capacity and quality, under the provisions of the pressure does not occur leakage, wetting or expansion of qualified, and some steel pipe according to the requirements of the standard or demand side of the curling test , Flaring test, flattening test.