Carbon steel pipe can be divided into seamless pipe, straight seam steel pipe, spiral steel pipe, high-frequency welded steel pipe. Rolling seamless carbon steel pipe is the raw material is round tube billet, round tube embryo to be cut through cutting machine into a length of about 1 meters of blank, and sent to the furnace by conveyor belt heating. The billet is fed into the furnace and is heated at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. In-furnace temperature control is a key issue. After the Tube billet is released, it is subjected to pressure piercing for piercing. Generally more common puncher is cone-shaped roller piercing machine, this piercing machine production efficiency, product quality, perforation expansion of large diameter, can wear a variety of steel grades. After piercing, the round tube billet has been three rollers inclined rolling, continuous rolling or extrusion. The diameter of the tube should be set off after extrusion. The sizing machine is rotated into the steel embryo by high-speed cone drill, forming the steel pipe. The inner diameter of the pipe is determined by the length of the diameter of the sizing machine bit. After the diameter of the steel pipe, into the cooling tower, through the water cooling, steel pipe after cooling, it will be straightened. After straightening, the steel pipe is sent from the conveyor belt to the crack detection machine (or hydrostatic test) for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, it will be detected. Steel pipe After the inspection also through strict manual selection. After quality inspection, spray the number, specifications, production batches, etc. with paint.
and is hoisted into the warehouse by a crane.
Cold drawn (rolled) carbon steel seamless pipe: round tube billet → heating → perforation → head → annealing → pickling → oiled (copper plating) → multi-Channel cold drawing (cold rolling) → billet Tube → heat treatment → straightening → hydraulic test (flaw detection) → Mark → warehousing Carbon steel seamless pipe because of its manufacturing process is different, but also divided into hot-rolled (extruded) seamless steel tubes and cold drawn (rolling) seamless steel pipe two.
Cold drawn (rolling) pipe is divided into round pipe and special-shaped tube two kinds. In addition, there are gb/t17396-1998 (hot-rolled seamless steel tubes for hydraulic support), gb3093-1986 (high-pressure seamless steel tubes for diesel engines), gb/t3639-1983 (cold drawn or cold-rolled precision seamless steel tubes), gb/t3094-1986 (cold-drawn seamless steel tubes), gb/t8713-1988 (seamless steel tubes for hydraulic and pneumatic cylinders), gb13296-1991 (seamless tubes for boilers and heat exchangers), gb/t14975-1994 (stainless steel seamless tubes for structural use), GB/s t14976-1994 (stainless steel seamless pipe for fluid conveying) gb/t5035-1993 (seamless pipe for automobile axle casing), API spec5ct-1999 (casing and tubing specification), etc.