PRODUCT

Large diameter thick-walled seamless steel ingot is made of perforated or solid through the capillary tube, then formed by hot rolling. Large diameter thick-walled seamless steel pipe has an important position in China’s steel industry. According to incomplete statistics, China’s existing seamless tube production enterprises more than about 240, large diameter thick-walled seamless steel pipe unit of about 250 sets of large diameter thick-walled seamless steel tubes mainly external diameter steel pipe for its generally an outer diameter of 325 mm or more we are called large-diameter steel pipe, thick-walled it, usually a wall thickness of 20 mm or more on it, the following is a steel pipe manufacturing process: raw steel is steel billets, tube to go through a cutting machine cutting a length of about 1 meter blank, and by conveyor belt to the furnace heating. Heating the billet to be fed into the furnace, the temperature is about 1200 ℃. The fuel is hydrogen or acetylene. Furnace temperature control is the key issue · after round tube furnace to go through the pressure punching machine wear air. Generally more common punch is tapered roller punching machine, punching machine such high production efficiency, product quality, perforated expanding capacity, can be worn a variety of steels. After perforation, round tube has been three-roll rolling, rolling or extrusion. To squeeze off the pipe after sizing. Sizing high-speed rotary cone drill bit through the perforated steel embryo formed steel. Pipe inner diameter is determined by the outer diameter sizing mill drill length. Pipe by sizing after entering the cooling tower water through the cooling pipe cooling, will be straightening (In fact, many of the manufacturers have no longer Straightening Machine, but rather by the steel mills directly It achieved its own steel straight degrees). After straightening the steel conveyor belt to the metal detection machine (or pressure test) for internal testing. If the internal pipe cracks, bubbles and other issues, will be detected. After the steel but also through strict quality control manual selection (now we have laser detection test).