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.

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.

Yonhap News Agency reported on April 4th that South Korea Steel had just won the “232 Survey” in the United States for exemption from customs duties, and immediately faced the EU’s investigation into safeguard measures for iron and steel. The industry expressed great concern. On March 26, the European Union announced that it will carry out investigations on safeguard measures for imported steel products, collect tariffs based on the survey results, or restrict imports in the form of quotas. The survey targets 26 varieties such as cold-rolled steel plates, hot-rolled thick plates, electrical steel pipes, and large-diameter steel pipes. According to the Korean Trade Association on the 4th, the EU’s total steel imports amounted to EUR 57.12 billion last year, of which the amount of imports involved in this safeguard measure amounted to EUR 21.2 billion, while Korea’s exports to the EU involved imports amounting to EUR 2.39 billion (about USD 2.94 billion). ), accounting for 11.3%, higher than the United States "232 investigation" tariff target amount of 2.79 billion US dollars. Some analysts claimed that the EU’s move was intended to prevent the influx of steel products from the world into the EU due to the “232 survey” in the United States. South Korea's steel is more difficult to find alternatives in the face of its blockade of exports to the United States and the European Union.

According to the report of the Basler Zeitung, the Swiss State Economic Affairs Agency has already applied for the United States to grant its tariff exemption; The Trump government is expected to make a decision by the end of April. According to the Swiss National Chamber of Commerce and Industry (Economiesuisse), an annual value of 90 million Swiss francs of export products will be affected by U.S. tariffs.

According to the characteristics of the city's buried sewage pipe, the coating of carbon steel pipes should meet the following basic requirements. (1) good chemical resistance;

The material should be chosen by the coating machine itself, because according to the installation and coating procedures, various materials can be used to meet the minimum requirements for the finished coating specified in this standard. Buyer should agree to any deviation from material use. The surface should be cleaned by sand blasting. Jet cleaning and any neces

Scope between ASTM A53 and ASTM A106 ASTM A53 is Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless. ASTM A106 is Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service. Application between ASTM A53 and ASTM A106

1, The supply of astm a53 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.