SSAW Pipe

　　Domestic high-precision seamless steel pipes generally improve the properties of materials by adding alloys to metals. After cold drawing, seamless steel pipes need to be subjected to stress relief annealing to eliminate residual stress of materials, improve material structure and improve materials. Plasticity, so as to prevent the occurrence of fracture failure of seamless steel pipe. 　　At present, the material of China's stainless steel seamless steel pipe is ordinary 45# or 20# steel 27SiMn steel, which improves the strength of the metal by cold drawing deformation; however, it is at the expense of plasticity and toughness of the sacrificial metal. High-precision cold-drawn seamless steel pipe is based on its high dimensional accuracy and high strength performance. It must ensure that the deformation amount is within a certain range to maximize the performance of the material and reduce the material. Negative Effects. 　　The deformation of the seamless steel pipe is too sma...

　　In the construction and repair of gas pipeline welding operations, sometimes magnetic blow phenomena affect the welding process. 　　The formation of magnetic blow pipe metal present in remanence results. Typically, the remanence is divided into two kinds of induction magnetic and processes magnetic. Often produce magnetic induction pipe part in the factory, such as: metal smelting, using electromagnetic crane for loading and unloading, pipe parked in a strong magnetic field, the magnetization method with complete nondestructive inspection, pipe placed close to power lines and so powerful. Magnetic assembly processes often produce during welding operations and the use of a magnetic holder, clamps and pipe welding with DC, such as: prolonged contact with the DC power supply connected to electrical conductors, bare wire welding clamp and pipe segment or short-circuit and so on. 　　When the welding magnetic seamless steel tube, often can see the difficulties of arc ignition, arc burnin...

　　Thread pipe and spiral pipe are one of welded steel pipe , but both there are essential differences. 　　The form of thread pipe present in the tube end, the majority of the connection tube is used. Particularly in the pipe connections are optional steel pipe, which can be more secure. Thread pipe is not just used for pipe connections, can also be used for casing and tubing connections. Thread pipe has high thermal conductivity coefficient, internal heat required for the heat than the external high places. Thread pipe have improved the performance and can keep temperature at work, in particular, the internal temperature. Under normal circumstances the internal temperature of the steel tube a temperature is higher than the outside 1 times. 　　Spiral steel pipe external form is rolled steel plate, and in a more visible on the surface of the weld. Spiral pipe has a strong corrosion resistance, is not susceptible to corrosion, the use of relatively long duration. So strong resistance t...

　　Capillary rolling is the main deformation process of seamless steel tube.Its function is to make the wall thickness of the capillary close to or reach the thickness of the finished pipe wall, and eliminate the non-uniform wall thickness of the capillary in the perforation process.The surface quality of the internal and external parts of the waste pipe is controlled, and the outer diameter and roundness of the waste pipe are controlled. The hollow capillary is rolled into a waste pipe near the final size. 　　1, double roll mill: continuous rolling mill is a more advanced steel tube rolling mill. It puts the porous capillary on the long mandrel, which is arranged on a number of frames in turn, and the joint of the adjacent frame roll is 90 degrees. The continuous pipe mill is rolled. The main material of the continuous roll is Ni Cr Mo infinite cold hard ductile iron (also known as Pearlite Nodular Cast Iron), nickel molybdenum infinite cold hard ductile iron (also called acicular nod...

　　Except for trestle and steel scaffolding system divided according to original material. Today, we would category the scaffolding system into single and double one. The detailed introduction and difference for them. 　　Single scaffolding, generally speaking, would be used for brick masonry. Thus, it is also known as brick layer’s scaffolding. This kind of product corresponds to the wall at the distance of about 1.2 m. This would be determined by the structure. And distance, mostly, the standards is around 2 to 2.5 m. Ledgers join the standards at an upright gap of 1.2 to 1.5 m. 　　Double scaffolding would be functioned at stone masonry job. Thus, it can be called mason’s scaffolding. Typically, in stone walls, it is tough to make holes in the wall for supporting putlogs; thus, two scaffolding rows are made to make it robust. 　　Due to the difference of single and double scaffolding, customers would know how to choose the suitable one for their engineering project. 　　 http://www.x...

　　In the production process of erw steel pipe, when the roll is damaged or worn seriously, some rolls need to be replaced on the unit, or a certain quantity is continuously produced in sufficient quantity, and the entire set of rolls needs to be replaced. At this time, the rolls should be adjusted to obtain good steel pipe quality. If the roll is not well adjusted, it is easy to cause the torsion of the steel pipe joint, lap welding, edge wave, embossing and scratching on the surface of the drum and the pipe body, and the ovality of the steel pipe is large. Therefore, the roll adjustment should be mastered when changing the roll. skill. 　　1) Replace the steel pipe specifications, generally replace the entire set of rolls. The method of adjusting the roll is to use a steel wire to pull a center line from the inlet to the outlet of the unit, and make adjustment so that each hole type is on a center line, and the forming bottom line meets the technical requirements. After changing the s...

　　Main equipment of high frequency electrical resistance welded steel pipe production line are as follows: 　 　1, The uncoiler 　　The hot rolled steel strip is taken apart and sent to the strip leveler. It is divided into two types: unwinding and unwinding. The uncoiler is the line front end equipment of the high frequency welded pipe production line. 　 　2, Steel belt leveling machine 　　The strip is leveled before the welded pipe unit is formed. Generally, there are upper base, lower base, transmission device, etc., there are five rolls, seven rolls, etc. In the high frequency welded pipe production line, a pinch roll is usually arranged in front of the leveling machine. 　　3, Shear butt welding machine 　　In order to ensure the continuous production of the high-frequency welded pipe production line, it is necessary to cut the irregular ends of the front and rear strips by the shear butt welder, and clamp and weld them together to form a continuously produced strip. 　 　4, Sto...