2017/06/14
2017/06/12
The Effect of Input Power on ERW Steel Pipe Production
When using high frequency technology to produce ERW steel pipe, controlling the input power of High-frequency welding is very important. So what effect does it have on ERW steel pipe production? And what should steel pipe factory do for that? Next, ERW steel pipe manufacturer Prime Steel Pipe who has years of experience on manufacturing carbon steel pipe will give your answer.
If the input power is too small, the pipe groove is not heated enough to reach the welding temperature, which can cause the welding failure such as pseudo soldering, unsoldering and slag welding. If the power is too large, it will affect the welding stability. When the heating temperature of the pipe groove surface is much higher than the temperature required for welding, which will result in severe splashing, pinholes, slag and other defects, those defect are known as over burning defects. When manufacturing ERW steel pipe, the input power of high-frequency welding need to adjust and determine according to the thickness of the wall and the molding speed. Different molding methods, different unit equipment, and different material grade of steel all need us to sum up from the production line, and work out high-frequency process that suitable for their own equipment.
Hot-rolled Seamless Steel Pipe
Hot-rolled seamless steel pipe is a large category of seamless steel pipe, which is divided according to the production method. Hot rolling is relative to cold rolling, cold rolling is carried out rolling at room temperature, and hot rolling is carried out rolling at the recrystallization temperature. Seamless steel pipe is named relative to the welded steel pipe, seamless steel pipe is usually made of round steel perforation and reprocessing, welded steel pipe is usually welded by steel plate in different ways. The diameter of hot-rolled seamless steel pipe is usually above 38mm. Seamless steel pipe with smaller diameter can be obtained by cold rolling or cold drawing.
The process of hot-rolled seamless steel pipe:
Hot-rolled seamless steel pipe is generally produced on automatic rolling mill units. The solid bar is inspected and cleared of surface defects. Then it is cut into the required length, and centered on face of the perforation end of the pipe billet. And then it will be sent to the heating furnace to heat, and bore a hole on the puncher. In the perforation, the solid bar will continue to rotate and forward at the same time, in the role of the roll and the head, the tube billet internal will be gradually formed cavity, that is said capillary. And then it will be sent to the automatic rolling mill to continue rolling. Finally, it will be reeled the wall thickness by reeling mill, sized by sizing mill, to achieve the specifications. It is a more advanced method that using continuous rolling mill to produce hot-rolled seamless steel pipe. Generally process of hot-rolled seamless steel pipe: round bars → heating → piercing → three-roll cross rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → parison tube → straightening → hydrostatic test (or flaw detection) → mark → storage.
The Use of LSAW Steel Pipe
Materials commonly used by LSAW steel pipe are: Q235A, Q235C, Q235B, 16Mn, 20 #, Q345, L245, L290, X42, X46, X60, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb and so on.
LSAW steel pipe in the country mainly used in water projects, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. For liquid delivery with: water supply, drainage. For gas transportation with: gas, steam, liquefied petroleum gas. For the structure with: for piling pipe, for the bridge; terminal, road, building structure and so on.
It is divided into general straight seam welded pipe, galvanized pipe, oxygen blowing pipe, wire casing, metric pipe, roller tube, deep well pump tube, automobile pipe, transformer tube, welded thin wall tube, welded pipe and spiral welded pipe.
General LSAW steel pipe: general LSAW steel pipe is usually used to transport low pressure fluid. Manufactured with Q195A, Q215A, Q235A steel. It can also be made of other mild steel that is easy to weld. Steel pipe has to be water pressure, bending, flattening and other experiments, the surface quality has certain requirements, delivery length is usually 4-10m, often requires cuttolength (or double length) delivery. The specifications of the welded pipe are denoted by nominal caliber (mm or inch). Nominal caliber is different from the actual one. The welded pipe has two kinds of ordinary steel pipe and thickened steel pipe according to the stipulated wall thickness. The pipe is divided into two types: pipe end and thread.
Galvanized steel pipe: In order to improve the corrosion resistance of steel pipe, the general steel pipe (black tube) for galvanizing. Galvanized steel pipe is divided into hot galvanized and cold galvanizing, zinc coating of hot galvanized is thickness, the cost of cold galvanizing is low.
Oxygen blowing pipe: Pipe manufacturer generally use small diameter welded steel pipe to produce steel blowing oxygen tube, specifications of it are from 3/8 inch -2 inch eight. Made with 08,10,15,20 or Q195-Q235 steel strip. For the erosion, some of those will do aluminizing treatment.
Wire casing: that is, ordinary carbon steel welded steel pipe, that is used in concrete and various structural distribution works, commonly used nominal diameter is from 13-76mm. The wire jacket wall is thinner, mostly coated or galvanized before use, and it requires a cold bending test.
Metric Welded Pipe: Specially used as a seamless pipe, it is the welded steel pipe that expressed by outer diameter * wall thickness mm, welded by the hot or cold belt of ordinary carbon steel, high quality carbon steel or general energy low alloy steel, cold zone welding. And then made by cold dial method. Metric welded pipe can be used for structural furniture, such as drive shaft, or conveying fluid, thin wall used to produce furniture, lamps, etc., to ensure that the strength of steel and bending test.
Roller tube: for belt conveyor roller welding steel pipe, generally use Q215, Q235A, B steel and 20 steel to manufacture, diameter is 63.5-219.0mm. It certain requirements on the tube bending, the end to the vertical line with the center line, the oval, and generally it must do water pressure and flattening test.
Transformer tube: used in the manufacturing transformer heat pipe and other heat exchangers, use ordinary carbon steel to manufacture, requires crushing, flaring, bending, hydraulic test. Steel pipe to the length or double the delivery, the bending degree of steel pipe have certain requirements.
Shaped LSAW steel pipe: made by ordinary carbon structural steel and 16Mn straight seam welded pipe and other square tube, rectangular tube, cap tube, air plastic steel doors and windows with steel pipe, mainly used for agricultural machinery parts, steel windows and so on.
Welded thin-walled tube: mainly used for the production of furniture, toys, lamps and so on.
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