The spiral steel pipe sends the strip steel into the welded pipe unit, and the strip steel is rolled up gradually after rolling by multiple rollers to form a circular tube billet with an opening gap. Adjust the reduction of the extrusion roller to control the weld gap at 1~ 3mm, and make both ends o

No. 45 seamless steel pipes are made of steel ingots or solid tube blanks that are perforated into capillary tubes and then made by hot rolling, cold rolling, or cold drawing. No. 45 seamless steel pipe plays an important role in my country's steel pipe industry. According to incomplete statistics,

The nominal diameter of straight seam steel pipe refers to the series of diameters specified in the standard for straight seam steel pipes. For straight seam steel pipes, pipe fittings, valves, etc., the nominal straight seam steel pipe diameter is represented by the series specified in the standard

Oil casing can be roughly divided into1. Surface casing.2. The middle casing.3. Production casing.4. Drilling casing.The surface casing is mainly to suspend and support the subsequent layers of the casing through the casing head installed on the top. Another is to isolate the surface shallow water l