SSAW Pipe

    In the hydrostatic test of erw tube, it is often found that the bursting opening breaks from the weld of the erw tube, which indicates that the strength of the weld site is lower than that of the base metal. Through experimental analysis, it has been found that if an internal scratch groove is formed on the inner surface of the steel pipe during the removal of the burr in the weld, the wall thickness of the sample at the weld site is reduced. In the tensile test, the sample can easily break from this point. .     The water pressure test of the water supply pipeline is the means for the final quality assessment of the erw tube laying. Generally, we have two requirements for the hydrostatic pressure test: First, it must be able to correctly reflect the pipeline leakage; second, pressure test when there is no problem, nor can the interface suffer damage due to pressure test. Instead, it will affect the quality of the project, or rework to retry, resulting in waste...

    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. For dynamic loads tubes have higher frequency of vibration than any other rolled section.     4. Ease of maintenance.     5. Free from sharp edges.     6. Ease of fabrication and erection.

    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 domesti...

    What is the difference between a thickened tubing and a non-thick tubing?     APT 5CT specified the requirements of Casing and tubing for the purpose of oil or gas production, must be cased with material with sufficient strength and functionality.     Oil tubing are the main parts of the well drilled construction. They are selected for the specific conditions anticipated in a given well. The anticipated production flow rates and economics of the well determine tubing size, which then determines the necessary size of each previous hole and tubular. Once the tubular size and setting depths are determined, the wall thickness and grade of material are then chosen by the well designer to ensure the strength is adequate for the expected loads. API 5CT developed specifications for three different connectors for use as casing tubing joints: External-upset tubing and coupling (Upset tubing),Non-upset tubing and couplings,Integral-joint tubing.   ...

    First, how to prevent thermal expansion and contraction     If this process is extremely slow and the temperature difference is not large, after cooling, it can basically be restored to its original shape, for example, placing an open-air steel plate on the noon evening; if this process is more rapid, it will be remnant due to the expansion of the steel that is forced by the warming. Deformation, after the temperature is restored, the deformation will not be restored, the warping is inevitable, such as the welding process, and if the gas welding is used to correct the deformation technology.     Second, how to prevent thermal expansion and contraction in buildings     Seamless steel tube play a huge role in construction and engineering. Seamless steel tube are subject to thermal variability, especially when they are used to transport natural gas, water, and petroleum on pipelines. Due to the fact that the liquid is often hot and deforme...

    Due to the different amount of zinc, there are three types of galvanized steel pipe which divided into Pre-painted, Cold-dipped galvanized and Hot-dipped galvanized. And which kind of influence for the different amount of zinc in galvanized steel pipe?     The specific zinc amount in galvanized steel pipe:     1. Pre-painted (zinc: 60-120G/M2);     2. Cold-dipped galvanized(zinc:10-50G/M2).     3. Hot-dipped galvanized (zinc: 120-500G/M2);     From the list above, we can see that details for zinc amount in galvanized steel pipes. Generally speaking, if there is low zinc content, and scattered capacity is good, but the current efficiency decline. Under this situation, we should decide the zinc amount carefully for the consideration of the function for different types of galvanized steel pipe.     http://www.xysteelpipe.com/info/Zinc-amount-decides-the-type-of-galvanized-steel-pipe-994-1.htm

    Reasons for the crack of ASTM A53 seamless steel pipe :     First, the reasons for the tube (round) mostly, the internal contains more cracks, inclusions, air bags and so on. Uneven organization of the tube is the reason, pay attention to the choice of the implementation of tube standard, there is a certain size of the manufacturer of the round bar on the line.     Second, the perforation temperature, process adjustment can not be ignored, if the piercing temperature is low, improper adjustment, can also cause the tearing of the capillary tube internal organization.     Third, the finish annealing temperature is suitable. Perforated heating temperature 1180 ~ 1230 ℃, low, this is the temperature of carbon steel, take 1230-1250 was appropriate. Furnace time is generally more than 60min

    High frequency straight seam welded pipe fracture, hydraulic (pneumatic) parts used in mechanical performance design, brittle fracture and the use of temperature-related components.     It is found that when the temperature is lower than a certain temperature value, it is found that the data will change into brittle state, the impact absorption work decreased significantly, this phenomenon is called cold brittle, high-strength metal materials occurred in the low stress brittle fracture The organization of the data is far from uniform isotropic tissue will have cracks, there will be inclusions, pores and other defects, these defects can be seen as micro-cracks in the material. Therefore, the design should also be based on the operating temperature of the component to select the appropriate data of the cold and brittle transition temperature.     In general, it is assumed that the data is uniform and continuous isotropic. According to this method, the...

    Q235 is not only the material for the production of galvanized steel pipe frame, but also the only standard for inspecting the quality of the pipe rack, and also the standard for inspecting the quality of the pipe rack.     Q235 includes carbon C: ≤0.20% Si Si: ≤0.35%, manganese Mn: 0.3 ~ 0.7%, sulfur S: ≤0.045%, phosphorus P: ≤0.045%, chromium Cr: to allow the residual content of ≤0.30%, Ni: to allow the residual content of ≤0.30%, copper Cu: to allow the residual content of ≤0.30%, Q235B a certain elongation, strength , good toughness, easy stamping and welding, widely used in the manufacture of mechanical parts in general. Mainly used in construction, the bridge engineering and high quality welded structure.     Q235 Material galvanized pipe     Therefore, the use of materials Q235 galvanized steel pipe, rack tube material is divided according to:     1. A single standard steel pipe rack: it is a steel pipe with the same s...

    In long distance conveyance of crude oil, natural gas or refined oil, the pipeline usually need to be buried underground. When steel pipes or pipe fittings are in contact with soil and waters, we must consider its external anti-corrosion performance to ensure a durable lifespan of the pipeline.     The three layers Polyethylene(3PE/3LPE) external coating perfectly solves this problem. It consists of a high performance fusion bonded epoxy(FBE) layer, an adhesive layer and an outer layer of high density polyethylene. The three layers external coating has excellent resistance to abrasion, wear, acid, alkali and cathodic disbonding, etc. It is the preferred choice for transmission of oil and gas around the world. It can withstand varied temperatures and enviroments ranging from dessert dry lands to deep underwater regions. 3lpe coated steel pipe are uesd for transportation of drinking water. Oil and gas and other fluids. The 3LPE coated pipes can be used in the hig...

    As for versatile and efficient form for construction and mechanical functions, we know that hollow section tube from scaffloding steel pipe to galvanized steel pipe has an important role in these project. We can take a view for Tianjin Xinyue Steel Group's hollow section tube today.     Scaffolding Tube:     Use: Scaffolding is a temporary structure used to support people and material in the construction or repair of buildings and other large structures. Material Storage Racks, Pallets, Hydraulic Platforms, Trusses, Columns, Purlins, Greenhouse, Stands Towers, Agricultural Equipment     Standard: BS 1139, BS1387-1985, EN 39, EN10219, JIS G 3444     Certificate: EN10217, EN10219, API 5L PSL1/ PSL2, API 5CT     Out Diameter: 27mm, 38mm, 42mm, 48.3mm-48.6mm     Wall Thickness: 2.0mm, 2.5mm, 2.75mm, 3.0mm, 3.25mm, 3.85mm, 4.0mm     Galvanized Steel Pipe:     Type:     ...

    The reasons for the wide effect of seamless steel tubes include the following: Seamless steel tubes can be combined with other materials for production, and the production volume is very large. It can be used for the transportation of substances and speed up the circulation of substances, such as pipeline transportation. Because it is stronger than ordinary steel pipes, it can also be used to measure the external pressure of the liquid. It is a very good pressure measurement tool. Not only can be used to measure the water pressure of ordinary water, but also to supply energy for some mechanical products.     1. Structural seamless steel tube. Mainly used for general structure and mechanical structure.     2. Seamless steel tube for conveying fluid. It is mainly used for conveying fluid pipelines in engineering and large-scale equipment.     3. Seamless steel tubes for low and medium pressure boilers. Mainly used for industrial boilers an...

    With the same condition of alloy composition for a steel pipe, the good quality or bad quality of steel pipe, to some extent, would depend on the corrosion resistance. Today, as supplier of seamless steel pipe, ERW steel pipe, Xinyue Steel would have an analysis for steel pipe.     First, same chemical composition, same heat treatment, with same standard of steel pipe, the corrosion resistance would be consistent.     Second, tests shows that the steel pipe welding has the equal or better corrosion resistant compared to the metal to be welded.     In addition, in acid circumstance, incomplete heat treatment accelerates corrosion at the weld, but this only requires a corrosion test.     Final, for bending and tensile test. We know that they are important for bending and tensile in engineering project. Weld seam extension can be verified by the following tests: ASTM 45 degree bending followed by 90 degree and then flattening al...