Honing seamless pipe specifications and good methods

- Jun 16, 2019-

The honing seamless pipe can be divided into hot rolled pipe, cold rolled pipe, cold drawn pipe and extruded pipe according to different production methods.


1. Hot rolled seamless pipes are generally produced on automatic rolling mills. The solid tube blank is inspected and the surface defects are removed, cut into the required length, centered on the end face of the perforated end of the tube blank, then sent to a heating furnace for heating and perforated on the punching machine. At the same time, the perforation is continuously rotated and advanced. Under the action of the roll and the head, a cavity is gradually formed inside the tube blank, which is called a capillary tube. Then send it to the automatic pipe rolling machine to continue rolling. The uniform machine is uniform in wall thickness and sizing through the sizing machine to meet the specifications. It is a good method to produce hot-rolled seamless steel tubes by using continuous rolling mills.


2. If you want to obtain a seamless tube of smaller size and better quality, you must use cold rolling, cold drawing or a combination of the two. Cold rolling is usually carried out on a two-roll mill in which the steel pipe is rolled in an annular hole type composed of a variable-section circular hole groove and a stationary tapered head. Cold drawing is usually carried out on a single-chain or double-chain cold drawing machine of 0.5 to 100T.


3. The extrusion process is to place the heated tube blank in a closed extrusion cylinder, and the perforated rod moves together with the extrusion rod to extrude the extrusion from the smaller die hole. This method can produce steel pipes with smaller diameters.


Honing seamless pipe


The inner and outer surfaces of the honing seamless pipe shall be free from cracks, folds, rolling, separation, hairline and crusting defects. These defects should be completely removed, and the wall thickness and outer diameter must not exceed the negative deviation after removal. Both ends of the steel pipe should be cut at right angles and the burrs removed. Steel pipes with a wall thickness greater than 20 mm allow for gas cutting and hot saw cutting. The agreement between the supplier and the buyer may also be unsuccessful.