Large-diameter thick-walled seamless steel pipe knowledge set - 51 steel pipe network to provide large-caliber thick-walled seamless steel pipe is made of steel ingots or solid billets perforated capillary tube, and then hot-rolled into. Large-caliber thick-walled seamless steel pipe has an important position in China's steel pipe industry. According to incomplete statistics, there are about 240 seamless pipe production enterprises in China and about 250 sets of large-caliber thick-walled seamless steel pipe units. Large-caliber thick-walled seamless steel pipes are mainly based on the external diameter of its steel pipes. Generally, the outer diameter of 325 millimeters or more is called a large-diameter steel pipe. Thick-walled ones generally have a wall thickness of 20 mm or more. The following is the manufacturing process of the steel pipe: The raw material of the steel pipe is a steel pipe blank, and the pipe blank must be After cutting by a cutting machine, a billet having a length of about 1 meter is machined and sent to a furnace for heating by a conveyor belt. The billet is heated in a furnace and the temperature is approximately 1200°C. The fuel is hydrogen or acetylene. Furnace temperature control is a key issue. After the tube blanks are released, they are put through the pressure puncher. The most common punching machine is a conical roller puncher. This puncher has high production efficiency, good product quality, large perforation diameter, and can wear a variety of steel types. After piercing, the round billet is successively rolled, rolled or extruded by three rolls. After squeezing, take off the sizing. The sizing machine drills through the cone at a high speed into the steel die to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine drill. After the steel pipe is sizing, it enters the cooling tower and is cooled by spray water. After the steel pipe is cooled, it must be straightened (it is realized in many manufacturers that it is no longer necessary to straighten the straightener, but directly passes through the rolling mill. It reached the straightness of its pipe itself). After straightening the steel pipe, it is sent to the metal detector (or hydraulic pressure test) by the conveyor belt for internal inspection. If there are cracks inside the pipe, air bubbles and other problems will be detected. After the quality inspection of the steel pipe, it must pass strict manual selection (there are laser detection inspections now). After the quality inspection of the steel pipe, the paint is sprayed with the serial number, specifications and production lot number. And lifted into the warehouse by a crane.
The specifications of the seamless steel pipe are expressed in terms of outer diameter*thickness mm.
The specifications of the seamless steel pipe are expressed in terms of outer diameter*thickness mm.
Dimethyl Malonate is a common organic reagents, dimethyl malonate is an important raw material for the production of pharmaceutical pipemidic acid. Foreign dimethyl malonate is mainly used as non-ethoxymethylene process production of pipaic acid raw materials, and orthoformate and urea reaction production of pipemidic acid
Monopotassium Phosphate in the application of detection and production applications play an important role
Organic Intermediate,Inorganic Salt,Dimethyl Malonate,Monopotassium Phosphate,Phosphate
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