Seamless steel pipe are widely used in the manufacture of structural parts and mechanical parts. The tube forming technology of seamless steel pipe mainly includes hot extrusion method, hot spinning method, hot perforation rolling method and hot pushing method. Before the extrusion, it is necessary to carry out machining pretreatment of the blank. When the pipe fittings with a diameter of less than 100 mm are extruded, the equipment investment is small, the material waste is small, and the technology is relatively mature.
The seamless steel pipe is to fix the flat blank or the preformed blank to the rotating mandrel, apply pressure to the blank by the rotating wheel, and simultaneously feed the rotating wheel in the axial direction, and after one or more processing, various thin-walled hollows are obtained. Process method for a rotating body product.
Hot piercing and rolling is mainly based on longitudinal rolling and cross rolling. Seamless steel pipe have hollow sections and are used in large quantities as pipes for transporting fluids, such as pipes for transporting petroleum, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, seamless steel pipe is lighter in weight when it has the same bending and torsional strength, and is an economical section steel. Vertical rolling and rolling is mainly limited to dynamic mandrel rolling mill rolling, small frame limiting mandrel rolling mill rolling, three-roller limiting mandrel rolling mill rolling and floating mandrel rolling mill rolling.
The push-expanding and expanding equipment is simple, the cost is low, the maintenance is convenient, the economy is durable, and the product specifications are changed flexibly. If it is necessary to prepare a large-diameter elbow and the like, only some accessories need to be added. It is suitable for the production of medium and thin wall thick large diameter seamless steel pipe, and can also produce thick wall pipe which does not exceed the equipment capacity.
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