Double Submerged Arc Welded steel pipe (DSAW pipe) is available in straight and spiral welded formats and used in a variety of applications. The submerged welding process protects the steel from contamination of impurities in the air. Both inside and outside welds are performed.

All drill pipe and tool joints are manufactured in our modern and technologically advanced manufacturing facility at USI . Each tool joint is forged, machined, processed, inspected and tested by qualified operators to ensure the quality meets or exceed API specifications and customer’s requirements.

Product: API 5CT OCTP PIPE Material: H40.J55.K55.N80.C75.L80.C90.T95.P110.Q125 OD: 114.3mm to 508mm Wall thickness: 5.12mm to 16.13mm length: R1(4.86-7.62M). R2(7.62-10.36M). R3(10.36-13Meters)

The quality control of high frequency longitudinal welded pipe is also a key factor to ensure the safety of operators. The main application fields include large span power grid engineering, steel structure engineering construction, electric power and ultrahigh pressure transmission and transmission engineering, mechanical engineering, bridge, bridge, railway station, airport, stadium steel structure, municipal pipe network, foundation pile driving, water gas pipeline and highway construction.

ASTM A53 seamless steel pipe crack cause: First of all, most of the reasons for tube (circle) include internal cracks, inclusions, air bags and so on. The uneven organization of the pipe is the reason. We should pay attention to the implementation of the standard of pipes, and the bar manufacturers with a certain scale will do that. Secondly, piercing temperature and technological adjustment can not be ignored. If the piercing temperature is low, improper adjustment will cause capillary internal tissue tear. Third, the final annealing temperature is suitable. The heating temperature of perforation is 1180 ~ 1230 C, which is low, which is the temperature of carbon steel and 1230-1250. The furnace time is generally more than 60min

1, the supply of ASTM A53 seamless steel pipe, compared with other traditional pipes, is lighter in raw material, high in strength, good in tolerance, can withstand high internal pressure, is sensitive to production, and can be used in disorderly or abominable geological conditions. 2, however, there is a great final speed in the use of steel pipe, which is difficult to treat inside and outside. The main external corrosion of this problem is very important, and the quality of its external corrosion directly affects its service life. Now the main external steel pipe corrosion is a concealed way to strengthen or enhance external corrosion for steel pipes, and promote cathodic protection in some areas. The external corrosion methods for hidden types are usually coatings, such as petroleum bitumen, epoxy coal tar and so on. It is not easy to cure at low temperature, but more problems in the field welding are used, and Chlorsulfonated polyethylene is used, because most solvents are easy to pinhole and prevent breakdown from breakdown, and some areas are no longer clear. Its cathodic protection has good corrosion protection effect, but because of the choice of sacrificial anode method, it is necessary to replace the anode regularly in the future operation, and increase the operation cost and operation.

Because the individual quality of the spiral steel pipe is relatively large, it must be stacked outdoors, but it is difficult to avoid the sun and rain, so the problem has been puzzling the storage time and conditions of the spiral pipe rust tube. Therefore, we need to have a comprehensive understanding of the anticorrosive situation of spiral steel pipes.

Difference between Thermal Expansion of Seamless Steel Tubes and Seamless Steel Pipe

Because the individual quality of the spiral steel pipe is relatively large, it must be stacked outdoors, but it is difficult to avoid the sun and rain, so the problem has been puzzling the storage time and conditions of the spiral pipe rust tube. Therefore, we need to have a comprehensive understanding of the anticorrosive situation of spiral steel pipes.

The thermal expansion of seamless steel tube is the thermal expansion steel tube which we often talk about. Its density is relatively low, but the steel tube has strong contraction. (seamless steel tube) can be called the thermal expansion steel pipe. In a short time, the outer diameter of steel pipe can produce non standard, special type seamless steel pipe, and it has low cost and high production efficiency in a short time. It is a trend in the field of international pipe rolling.

1, the low quality thick wall seamless steel pipe is easy to fold. Folding is the surface of thick walled seamless steel tubes, which is formed by various fold lines. This defect often runs through the vertical direction of the product. The cause of folding is due to the high efficiency of the poor quality manufacturers, the pressure is too large, leading to the ear rolling in the next fold, after the folding of the product will break, thick wall seamless steel pipe strength decline.

The characteristics of API 5L seamless steel pipe are large diameter and thick wall thickness, so the "no blind spot" detection is realized by the combination of ultrasonic testing eddy current and internal and external surface detection function according to this characteristic. By using the "steel pipe rotation to detect the positive combination of probes", we not only solve the problem of heading detection, but also solve the space occupied by reducing the space.

Attention to the manufacture of API 5L seamless steel pipe equipment A. oil mark: hydraulic pressure tester can prevent oil corrosion through the steel pipe, and mark according to user requirements. B. level milling: leveling the original steel plate with the anvil press, then milling the sides of the steel plate with the edge milling machine, so as to achieve the required plate width, parallelism and groove shape. C. shear molding: the steel plate in the production line is rolled along the outer coil.

The Ukrainian Steel Manufacturers Union Ukrmetallurgprom issued a news on April 5. In the first quarter of this year, Ukrainian crude steel production fell 3% from the same period last year to 5.23 million tons. Steel is one of the most exported Ukrainian products

The loss rate of spiral pipe manufacturing refers to the proportion of raw material waste in the manufacturing process of spiral tubes. According to years of statistics and analysis by professional technicians, the loss rate of spiral tube manufacturing is between 2%-3%.

1. looks from the spiral steel tube. The appearance is to pay attention to those welded joints. The appearance is not a defect and a lack of scale. This can be seen by the naked eye, of course detailed and bilateral theories, using standard models, measurement and magnifying glasses. Because of the appearance of welding defects, this means that the internal spiral tube is very likely to have defects, even if the effort in appearance is not completed, the internal effort is difficult to guarantee.

ASTM A520 Standard Specification for seamless and resistance welded carbon steel pipe products supplementary requirements, for high temperature service, in line with the ISO standard of boiler structure. If the edge steel or stainless steel is used in the manufacture of resistance welded steel pipe according to the requirements of the standard A520, the steel strip should be coiled in a single width and not cut longitudinally except the edge trimming.

The US "Wall Street Journal" disclosed in a report on the 16th that Peter Navarro, director of the White House National Trade Commission, has a close relationship with the US steel industry interest group and has instructed steel companies to provide funds to shoot documentaries supporting their political views.

The quality control of high frequency longitudinal welded pipe is also a key factor to ensure the safety of operators. The main application fields include large span power grid engineering, steel structure engineering construction, electric power and ultrahigh pressure transmission and transmission engineering, mechanical engineering, bridge, bridge, railway station, airport, stadium steel structure, municipal pipe network, foundation pile driving, water gas pipeline and highway construction.

The typical process of high frequency straight welded pipe: open coil - steel strip leveling - head and tail shear - steel strip butt welding - Live sleeve storage - forming welding - cleaning burr - sizing - Test - flying shear - straight pipe processing - water pressure test - printing and coating - finished products.

In all steel pipes, ASTM A53 seamless steel pipe occupies a large proportion, but in actual production, the seamless steel pipe is often used to control rolling and cooling technology. It is easy to control the cooling process caused by the uneven defects of the cooling plate, which seriously affects the quality of the product and the contract cash. The surface wave is one of the more serious ones.