What is Seamless carbon steel pipe?

     Seamless carbon steel pipe , is made of steel ingot or solid tube perforation made of capillary, and then by hot-rolled, cold-rolled or cold dial made. Seamless carbon steel pipe industry in our country has an important position. According to incomplete statistics, there are about 240 existing seamless carbon steel pipe producers in China and about 250 sets of seamless carbon steel pipe units with an annual capacity of about 4.5 million tons. From caliber, <φ76, accounting for 35%, <φ159-650, accounting for 25%. According to the varieties, the general purpose pipe is 1.9 million tons, accounting for 54%; the oil pipe is 760,000 tons, accounting for 5.7%; the hydraulic prop and precision pipe are 150,000 tons, accounting for 4.3%; the stainless pipe, bearing pipe and automobile pipe are 50,000 Ton, accounting for 1.4%.

     Seamless carbon steel pipe raw material is a round tube, round tube to cut through the cutting machine into a length of about 1 meter blank, and sent to the furnace by the conveyor belt heating. Billet was sent to the furnace heating, the temperature is about 1200 degrees Celsius. The fuel is hydrogen or acetylene. Furnace temperature control is a key issue. After the tube is baked through the pressure piercing punch. Generally more common piercing machine is a conical roller piercing machine. This piercing machine has the advantages of high production efficiency, good product quality, large amount of perforation expansion, and can wear many kinds of steel. After perforating, the round tube has been three-roll oblique rolling, rolling or extrusion. After extrusion to take off the tube sizing. Sizing machine through the cone bit high-speed rotation into the steel embryo drilling, the formation of steel. The inner diameter of the pipe is determined by the outer diameter of the sizing drill bit. After the diameter of steel pipe, into the cooling tower, through the spray cooling, steel cooling, it will be straightened. Steel straightening by the conveyor belt to the metal detector (or water pressure test) for internal testing. If there are cracks inside the steel pipe, bubbles and other issues, will be detected. Pipe quality inspection but also through a rigorous manual selection. After the quality control of steel pipe, the paint sprayed on the number, size, production lot number and so on. And by the crane hanging into the warehouse.