Large caliber thick wall seamless steel pipe is mainly based on its external caliber of steel pipe, average caliber above 325 mm, wall thickness in more than 20 mm can be called large caliber thick wall seamless steel pipe, the following is manufacturing process of large caliber thick wall seamless steel pipe, raw material of large caliber thick wall seamless steel pipe is steel billet, cutting machine cutting the growth degree of about 1 meter of billet, and the conveyor belt to the heating furnace.The billets are fed into a furnace and heated to a temperature of about 1200℃.The fuel is hydrogen or acetylene.Temperature control in the furnace is the key problem. The round pipe billet has to be hollowed out by a pressure punch.The common puncher is the conical roller puncher, which has high production efficiency, good product quality, large size of perforation and can pierce many kinds of steel.After perforation, the billet is rolled in three rolls, rolled in tandem, or squeezed.After extrusion the pipe should be removed to size.The sizing machine rotates a tapered bit at high speed into the steel blank to drill holes to form steel pipes.The inner caliber of the steel pipe is determined by the length of the outer caliber of the sizing machine bit.After the steel pipe through sizing, into the cooling tower, through the water cooling, the steel pipe after cooling, will be straightened (in fact, now many manufacturers have no longer straightening machine straightening, but in the steel pipe through the mill directly to its own straightness of the steel pipe).After straightening, the steel pipe is sent by the conveyor to the metal flaw detector (or hydraulic test) for internal flaw detection.If there are cracks, bubbles and other problems inside the steel pipe, they will be detected.After quality inspection of thick wall and large caliber seamless steel pipe, it has to pass strict manual selection (laser detection inspection is now available).After steel pipe quality inspection, paint the serial number, specification, production batch number, etc.It is hoisted into the warehouse by a crane.

Jinjiang Changjiang steel pipe Industry Co., LTD. Specializes in thick wall, large caliber seamless steel pipe, Fujian seamless pipe, Fujian spiral pipe and shelf pipe production and sales, welcome to inquire: 86-0595-82151777