steel pipe

 　　At 2019 fair, we have first short meeting with customers . the customers’ schedule time was very tight. However, they were very interested in our steel pipe exhibits. After a brief communication, we exchanged business cards. 　　The Customer mainly serves the South America local coal mining company. It owns a processing and welding factory , importing steel pipe and fittings from various countries for further processing to the owner. 　　After the customer go back, we have been kept closed communication online, promoting new products and technologies. During those times, we have provided 18 quotations, 8 project technical consulting services, and more than 100 emails . In the current severe epidemic situation, customers have a high think of Xinyue's quality and service, and accepted Xinyue as their company's new steel pipe supplier. In mid-April, We signed a trial order . 　　API5L standard ， Steel grade GRB, steel pipe diameters range from 12 inch to 24 inch. Those pipes need fur...

 　　The "boots" of steel product tariff policy adjustment finally landed. On April 28, the Ministry of Finance and the State Administration of Taxation issued an announcement stating that since May 1, the export tax rebate for 146 hot-rolled plates, cold-rolled plates, coated plates, stainless steel, pipes and other steel products will be cancelled. On the same day, the Customs Tariff Commission of the State Council issued an announcement stating that from May 1st, tariffs on some steel products will be adjusted: zero import tariffs on pig iron, crude steel, recycled steel raw materials and other products will be implemented, and ferrosilicon, ferrochrome, Export tariffs on products such as high-purity pig iron. So far, the tariff adjustment policy that has been circulating in the market for months has finally landed. 　　The author believes that the purpose of this round of adjustment is to "promote suppression", ensure the balance of supply and demand in the domestic...

 　　Xinyue has accumulated many customers in every state through more than 10 years marketing development. Australia is always one of Xinyue Steel's main markets. Xinyue Steel has a large stock of rectangular and round tubes under Australian standard. 　　The relationship between customers and us need to be built through a long time. On November 2019, I received the first email about rectangular tube requirement from customer’s company. Through continuous quotations and communications, Xinyue provided customers with a lot of information and certificates related to products and import tariffs. Customers were very satisfied with Xinyue's services and qualifications, they were always looking for suitable orders to cooperate with Xinyue. 　　Until April 2021, customers urgently needed a batch of square tubes made of AS1163 C350. Xinyue provided customers with quotations and sufficient inventory as soon as we received their inquiries. The customer confirmed the PO soon. As soon as Xinyue...

 　　At the end of the May, a batch of Xinyue's elbows took a huge ship to our neighbor Vietnam. 　　The elbow is a commonly used connection pipe fitting in plumbing installation, used for the connection of the pipe bend, and used to change the direction of the pipe. In the pipeline system, the elbow is a pipe fitting that changes the direction of the pipeline. 　　Xinyue has a lot to say about this buyer. The fate started at a certain exhibition many years ago, and only one side of the relationship was firmly remembered by the customers. When the customer's business scope expands and gradually intersects with us, the first thing the customer thinks of is Xinyue. When you ask us for a price for the first time, you will place an order with us. 　　This project is a fluid transportation project. The entire list involves nearly 100 products, covering pipes and fittings. After receiving customer news from the end of February, we immediately formed a project team to serve customers wholehea...

 　　The technological development of the high-temperature industry has stimulated the research and development of refractory materials, and the product variety and structure have been continuously improved. 　　In the early days of the founding of the People’s Republic of China, my country’s steel industry basically adopted open-hearth smelting technology and die-casting production processes, resulting in low production efficiency and high energy consumption. 　　Since the 1990s, the application of the "flat conversion, full continuous casting and secondary refining" technology in the steel industry has been an important symbol of the progress of steel smelting technology. 　　—With the development of intensified smelting technology, some steel plants built some steel-making converters in the early 1970s, but the main body was still open-hearth steelmaking. At that time, refractories did "drag" the iron and steel industry. After Baosteel's first phase was put into prod...

 　　There are many ways to inspect the quality of LSAW steel pipes, among which physical methods are also the most commonly used inspection methods. Physical inspection is a method of measuring or inspecting using some physical phenomena. The inspection of internal defects of materials or longitudinally welded pipes generally adopts non-destructive testing methods. The current non-destructive testing includes magnetic testing, ultrasonic testing, radiographic testing, penetrating testing and so on. 　　1. Magnetic inspection 　　Magnetic inspection can only find defects on the surface and near the surface of the magnetic LSAW longitudinally welded pipe, and only quantitative analysis of the defects can be done, and the nature and depth of the defects can only be estimated based on experience. Magnetic inspection is to use magnetic field magnetization of ferromagnetic longitudinally welded pipes to generate magnetic flux leakage to find defects. According to the different methods of meas...

 　　Generally, large diameter elbows will be deformed after welding. If the deformation exceeds the permissible value, the use of the elbows will be affected. The main reason for the deformation of the elbows is local heating and cooling of weldments. During welding, only the partial area of the weldment is heated to high temperature, and the closer the part is to the weld, the higher the temperature and the greater the expansion becomes. 　　However, the heated metal can not expand freely because of the surrounding metal with lower temperature. As the metal cools, it cannot contract freely due to the containment of surrounding metal. As a result, the heated metal has tensile stress, while the surrounding metal has compressed stress to balance the tensile stress. When these stresses exceed the yield limit of metal, welding deformation will occur. When these stresses are in excess of the strength limit of metal, the cracks will appear in the elbow. 　　The external defects of the weld 　　...

 　　Seamless steel pipes are made of a single piece of metal and have no seams on the surface. They are made of steel ingots or solid pipe billets through perforation, and then hot-rolled, cold-rolled or cold-rolled. Seamless steel pipe is different from other steel pipes. It has strong corrosion resistance, sturdiness and durability, and adapts to different purposes. It has strong applicability in the construction process and is not restricted by natural conditions during installation. The details are as follows : 　　1. Excellent wear resistance: 　　The thickness of the wear-resistant layer of the seamless pipe is 3-12mm, the hardness of the wear-resistant layer can reach HRC58-62, the wear resistance is more than 15-20 times that of ordinary steel plates, and the performance of low-alloy steel plates is more than 5-10 times. It is high-chromium cast iron. The wear resistance is more than 2-5 times, and the wear resistance is much higher than that of spray welding and thermal sprayin...

 　　According to the purpose and the pipe material, the commonly used connection methods of the construction pipeline are: threaded connection, flange connection, welding, groove connection (clamp connection), card sleeve connection, compression connection, hot melt connection, etc. 　　1. Threaded connection 　　Threaded connection is the use of threaded pipe fittings. Galvanized steel pipes with a diameter of less than or equal to 100mm should be connected with threaded pipes. They are mostly used for surface-mounted pipelines. 　　Steel-plastic composite pipes are generally connected by threads. Galvanized steel pipes are connected by threads, and the surface of the galvanized layer and the exposed threads that are damaged during threading should be treated with anti-corrosion treatment. 　　2. Flange connection 　　Flange connection is to fix two pipes, pipe fittings or equipment on a flange plate respectively, then add a flange gasket between the two flange plates, and finally tighten th...

 　　The high-frequency welded pipe (ERW steel pipe) forming roll is an important part of the welded pipe unit and the technical core of the welded pipe forming process. The forming of high-frequency welded pipe needs to go through five basic processes: edge bending-overall bending-closed introduction-extrusion welding-shaping. In the welded pipe industry, the process before high-frequency welding is usually called preforming. 　　(1) Edge forming 　　Edge forming is the first step in the forming process of high-frequency welded pipes. Its purpose is to bend the edge of the strip to the curvature of the squeeze roll radius. The traditional process uses single radius forming, and the modern process uses double radius forming. 　　The initial double-radius forming was a simple double-radius upward bending, which was later developed into W forming. The bending of the middle part of the molding method uses reverse protrusions to more fully bend the edges, and the linear velocity difference of ...