A seamless steel tube is made of a steel ingot or solid tube that is perforated into a capillary and then is made of hot rolled, cold rolled or cold.The specification of seamless steel tube is indicated by the outer diameter of the wall thickness millimeter.
Seamless steel tube and cold rolled (dial) seamless steel tube two kinds.Hot-rolled seamless steel tube general steel pipe, low and medium pressure boiler pipe, high pressure boiler tube, alloy steel, stainless steel pipe, oil cracking pipe, geological steel pipe and other steel pipe and so on.Cold-rolled (dial) seamless steel tube in addition to general steel tube, low medium pressure boiler pipe, high pressure boiler tube, alloy steel, stainless steel pipe, oil cracking pipe, steel pipe, other include carbon thin wall steel tube, alloy thin wall steel pipes, thin-walled stainless steel tube, steel tube.
Generally greater than 32 mm hot rolled seamless steel tube diameter, wall thickness 2.5 75 mm, to 6 mm cold rolled seamless steel tube diameter, the thickness of the wall thickness can reach 0.25 mm, to 5 mm thin wall pipe diameter thickness less than 0.25 mm, cold than hot rolled high dimensional accuracy.
As the name implies, the temperature of the rolling piece is high, so the deformation resistance is small, can realize the large deformation quantity.Take the rolling system of steel plate as an example, the thickness of the continuous casting billet is about 230mm, and the thickness is 1 ~ 20mm after roughing and rolling.At the same time, because the thickness of steel plate is smaller than small, the dimension accuracy requirement is relatively low, the plate type problem is not easy to appear, the control convexity is given priority to.For organizations have requirements, generally by controlled rolling cold, open rolling by control of the finishing temperature, finishing temperature and coiling temperature to control the microstructure and mechanical properties of strip steel.
General use ASTM A106 seamless steel pipe is made of 10, 20, 30, 35 and 45 high quality carbon steel guitar 16 mn, 5 MNV low alloy structural steel or 40 cr, 30 crmnsi, 45 mn2 and 40 MNB guitar made from hot rolled or cold rolled steel.The seamless pipe made by low carbon steel, such as 10 and 20, is mainly used for flow pipe.The seamless work of medium carbon steel such as 45 and 40Cr is used to make mechanical parts, such as car and tractor parts.Generally use seamless steel tube to ensure strength and pressure flat test.Hot rolled steel pipe in hot rolled state or heat treatment.Cold rolled with heat treatment.
What are the precautions for storing seamless steel pipes?
1. Choose a suitable venue and warehouse; 2. Reasonable stacking, advanced first; 3. Packaging and protective layers of protective materials; 4. Keep warehouse clean and strengthen material maintenance.
Significance of Proximity Effect on the Production of High-frequency Longitudinal Welded Pipes
In addition to the skin effect, the proximity effect is another feature of current. When alternating currents of equal magnitude and opposite directions pass through two adjacent conductors, the current will flow through the adjacent inner surface layers of the two conductors, and when the two conductors pass When alternating currents of the same size and direction, the current will flow through the outer surface layers of the two conductors. The proximity effect of the current makes the current in the conductors further uneven. It is this unevenness that makes the high-frequency welded pipe(ERW).
Summary of Advantages and Disadvantages of High-Frequency Welded Pipe Forming Methods
Advantages and disadvantages of high-frequency welded pipe forming methods
