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.

As the individual quality of spiral steel pipe is relatively large, it must be stacked in the outdoors, but it will be difficult to avoid the sun and rain, so the problem has been plagued with rust spiral pipe storage time and conditions. Therefore, we need to conduct a comprehensive understanding of the spiral steel pipe rust prevention.

The thermal expansion seamless pipe is a thermal expansion pipe that we often say. Its density is relatively low, but the pipe has very high shrinkage. (Seamless steel pipe) can be called a thermal expansion pipe. A method for expanding the diameter of a pipe by a transverse rolling method or a drawing method; in a short time, the outside diameter of the steel pipe can produce a non-standard and special type of seamless pipe, and the cost is low and the production efficiency is high. It is an international roll pipe field. The development trend.

1, the next thick-walled seamless steel pipe easy to fold. Folding is the formation of a variety of fold lines on the surface of thick-walled seamless steel tubes, which often run through the entire product. The reason for the folding is that due to the pursuit of high-efficiency counterfeit manufacturers, the pressure is too great, the ear is caused, and the next rolling produces wrinkles, the folded product will be broken and bent, and the strength of the thick-walled seamless steel pipe will decrease.

The Costa Rican media "extro" reported in March 25th that if the economic and Commercial Ministry of Commerce (MEIC) approved the increase of steel import tax, the country will face a series of serious consequences. According to CCC's news, last week, the Ministry of economy and Commerce released an open investigation and resolution plan to take protective measures and raise the tariff of steel bars. As steel is the basic material for all kinds of production activities, especially in the construction industry, the association of architects, architectural and engineering consultants and the real estate development commission are firmly opposed to raising tariffs, which will exacerbate the current competitive conditions and may even return to the state of monopoly. Besides, the domestic people will be severely affected by the rising housing costs, which limits the basic rights of families to have decent housing. If the tax is estimated by the Ministry of Commerce and industry and commerce, it may reproduce the plight of steel shortage and high price.

In March 19, 2018, the Ministry of economic, industrial and foreign trade of Costa Rica issued a bulletin on the Official Bulletin No. fifty-first of 2018, and decided to apply for the application of Ansai romittal Costa Rica company to launch a survey on the safeguard measures for universal carbon and alloy steel bars. According to the bulletin clause, the investigation will be opened after the 10 natural days of the announcement. The Costa Rica import tax rate for products involved is 721420000010, 7214200000090, 721499200010722830000010722850000010 and 722860000010. The interested parties are invited to register their complaints within 8 working days after the announcement and submit their answers in accordance with the requirements of the investigation organs within 45 natural days, and the answers may be postponed.

According to the report of the South African Daily News website on March 23, the Department of Trade and Industry of South Africa has formally submitted an application for seeking exemption from steel and aluminum duties to the United States. The ambassador of South Africa to the United States also recently traded to the National Security Council,

A few days ago, the Korea iron and Steel Association said that in February, the stock of cold rolled steel plates in South Korea reached 97 thousand and 400 tons, a decrease of 3.5% compared with the same period, an increase of 25.1% over the same period last year. Generally speaking, the beginning of spring production will lead to the decline of stainless steel stock, but the sales of stainless steel in South Korea will keep warm. The stainless steel production in Korea is expected to be 90 thousand tons ~10 million tons. Therefore, the growth of stainless steel consumption in Korea is basically stagnant. South Korea's stainless steel cold-rolled plate producers and distributors are puzzled.

API 5L seamless steel pipe is characterized by its large diameter and relatively thick wall thickness. Therefore, according to this feature, full use of ultrasonic eddy current detection and internal and secondary surface detection functions are combined to achieve a “no blind spot” test. By adopting the “steel tube rotation and detection probe forward combination”, it not only solves the problem of detection of the title, but also solves the space that occupies a narrow space.

Description of API 5L Seamless Steel Pipe Equipment Oil standard: Hydraulic pressure tester prevents oil corrosion after passing through the steel pipe, and marks according to user's requirements.

The use of spiral steel pipe is relatively high, and the application range is very wide. It should be selected before selection and pay attention to quality. The first method is a more professional method of detection by measuring the strength of the pressure vessel. Normally, we use atmospheric pressure and water pressure detection, which can detect the working conditions of spiral steel tubes working under pressure and detect the tightness of spiral steel tubes. Generally, it is measured at atmospheric pressure because the safety is relatively high, if water is used. Vapor pressure passes the test and then the need for a spiral tube under water is too much trouble. The second method is also relatively simple, that is, through the observation surface. Visually find problems with welding and size of spiral steel tubes, and if necessary, compare standard samples with products to find out where the problem lies. In general, the regular steel pipe company is relatively perfect in production, and on the other hand it is necessary to strike the metal pipe. If the sound is very crisp and the echo is not very dirty, then the name is the latest choice of steel pipe, not scrap recycling. Both methods are commonly used. We can choose one method to test. The safer method is the best regular manufacturer, which can reduce the abuse during use.

The spiral steel strip is formed by spiral bending of a steel strip or a spiral plate and is welded on both sides by submerged arc welding. Steel pipes are widely used in water, electricity, chemical industry and other industries for the following reasons.

In March 26th, the latest data from the World Steel Association showed that India has become the world's second largest producer of coarse steel, with 8 million 430 thousand tons of crude steel in February 2018 and 8 million 300 thousand tons in Japan. In the first 2 months of 2018, the crude steel output in India was 17 million 462 thousand tons, up 2.9% compared to the same period last year, and the crude steel output in Japan was 17 million 321 thousand tons, down 0.1% compared with the same period last year.