SSAW Pipe

    To ensure that the erw steel pipe in the winter welding perfect follow the following steps:     First, increase the welding current welding, slow down the welding speed, the appropriate increase in the cross-sectional area and length of the weld, if necessary, preheat.     Second, not outside the groove on the base metal to start arc, arc extinction to be filled when the pit.     Third, as far as possible not in low temperature conditions for bending, correction and assembly weldments.     Fourth, preheating before welding, welding process to strictly maintain the interlayer temperature should not be lower than the preheating temperature.     Fifth, the use of low hydrogen or ultra-low hydrogen welding materials.     Six, the entire weld should be finished as far as possible to avoid interruption.

    Straight seam steel pipe wall thickness control is a difficult production. At present, the straight seam steel pipe manufacturers to improve the wall thickness in the production of precision uses the methods generally including:     1, Tube heating     Heating to the average to prevent rapid up and down temperature. Each take-off and landing temperature is to maintain a smooth slow, the maximum rise and fall temperature does not exceed 30 ℃.     2, Rolling mill mandrel     Average wall thickness of thick wall tube and solid billet make the probability of mandrel bending deformation significantly reduced, can effectively improve the wall thickness of the precision.     3, The accuracy of mandrel     The outer core of the machining accuracy control in ± 0.1mm, mandrel straightness bias does not exceed 5mm. Welding, the two core rods between the piercing a finishing pin positioning, welding in order to...

    Resistance welding (ERW) is a low-cost, high-efficiency pipeline manufacturing technology, which produces a variety of steel pipe called ERW pipe. ERW welded pipe is made of steel plate or strip after crimping and then welded by high frequency resistance welding. The welded pipe with longitudinal weld has been widely used in oil and natural gas transmission pipeline, oil well casing, coiled tubing and soil (Such as a scaffold).     In recent years, the ERW technology has also been used to produce economical petroleum-grade pipes, partly because of the low cost of ERW technology; on the other hand, the petroleum-made pipes are made of inexpensive carbon steel to reduce pipeline costs. Since the ERW process is a localized heating and pressurizing process, the heat dissipates rapidly along the metal pipe and the crimped steel plate after welding under pressure. The cooling rate can reach the critical cooling rate of the steel. In the ERW pipe, Welding area of its ...

    Tubular steel structure are the best replacements to the conventional ones with their useful and comparatively better properties. It is obvious that due to the profile of the tube section, dead weight is likely to be reduced for many structural members.which derives overall economy.     Merits of tubular structure:     1. For tubular structure, higher strength to weight ratio could result in upto 30% savings in steel.     2. Due to the high torsional rigidity and compressive strength, Tubular sections behave more efficiently than conventional steel section.     3. Ease of maintenance.     4. For dynamic loads tubes have higher frequency of vibration than any other rolled section.     5. Free from sharp edges.     6. Ease of fabrication and erection.     Check www.xysteelpipe.com for more info

    1, The supply of seamless steel pipe compared to other traditional pipe, raw materials lighter, high strength, good tolerance, can withstand high internal pressure, the production of sensitive, and can be used to messy or harsh geological conditions.     2, But the steel pipe in the course of the existence of a large rate of end, the main internal and external corrosion treatment trouble. The main external corrosion of the question is very important, the quality of its external anti-corrosion directly affect its service life. Now the main external steel pipe corrosion: concealed type approach, on the steel pipe are requested to strengthen or special enhanced external corrosion, in some areas to promote cathodic protection. On the concealment type of external corrosion method is usually paint such as petroleum asphalt, epoxy coal tar pitch, which is not easy to cure at low temperatures, and welding in the field when the construction of more questions, originall...

    The main advantages of pipeline transportation can be summarized as follows:     (1) Large volume.     An oil pipeline can continue to complete the delivery task. Depending on the size of its diameter, its annual traffic up to several million tons to tens of millions of tons, or even more than 100 million tons.     (2) Small footprint.     Transport pipelines are often buried underground and occupy very little land; the construction of transport systems proves that the buried part of the pipeline is more than 95% of the total length of the pipeline, so the permanent occupation of the land is very small, 3% of the highway, about 10% of the railway, in the transportation planning system, give priority to pipeline transportation program, for the conservation of land resources, is of great significance.     (3) Pipeline transportation construction period is short and low cost.     A large number of domest...

    You, human beings, my friends are here, so I steel pipes with various categories like seamless steel pipe, ERW steel pipe, spiral welded pipe and so on are here for you. This is me who have life once you accompany with me.     I guide water, oil, gas and other products across the wasteland and protect them from the damage of sunshine and sand. I break the truth of we are serving for human who are our friends to them, then deliver them to wherever they're going, like the master they like, the engineering project they need to go.     ERW steel pipe is a naughty boy and with his surface of Fusion bond Epoxy coating, Coal Tar Epoxy, 3PE, Vanish Coating, Bitumen Coating, Black Oil coating with his friends as they think this is the symbol of them and this kind of surface would make them fashion and cool.     ERW steel pipe even said to the radio that If I was anything, I exist as steel pipe because you, my friends need me.     http...