steel tube

 　　At the end of March, the carbon steel seamless tube was sent to Laem Chabang, Thailand successfully, under the cooperation of Xinyue sales team,technical team, production team and documentation team. 　　This order came from an regular customer who is a large trader in South Korea. After the first order cooperation last year, the customer had a new understanding and dependence on Xinyue. Customers would always be the first time to send inquiries to Xinyue and informed the details of the inquiry. This time, the order was144 tons of ASTM A106 GR B carbon steel seamless tubes, which need to be shipped to Laem Chabang, Thailand. The third-party inspection was required for each order by this customer. 　　Xinyue has always been presenting an image with professional and honest business reputation to overseas customers. To help customers grow and to achieve a win-win situation is a business principle that our company adhere to. After signing the contract with the customer, the sales team c...

　　1. Complete annealing. It is used to refine the coarse superheated structure of medium and low carbon steel which has poor mechanical properties after casting, forging and welding. The workpiece is heated to a temperature of 30 to 50 ° C above the temperature at which all of the ferrite is transformed into austenite, and is kept for a period of time, and then slowly cooled with the furnace, and the austenite is again transformed during the cooling process, so that the microstructure of the steel is thinned. . 　　2. Spheroidizing annealing. It is used to reduce the high hardness of tool steel and bearing steel after forging. The workpiece is heated to a temperature of 20 to 40 ° C above the temperature at which the steel begins to form austenite, and is slowly cooled after the heat preservation. During the cooling process, the lamellar cementite in the pearlite becomes spherical, thereby lowering the hardness. 　　3. Isothermal annealing. It is used to reduce the high hardness of ce...

　　Production of cold drawing petroleum cracking tube can be cold-rolled, cold drawn, cold-drawn, cold-mix production. Using drawing process, a simple equipment, low investment, easy operation and maintenance and so on. But the drawback is the middle step of many, lumber rate. Using cold process equipment is more complex, and more investment, but can reduce the intermediate processes, improve the yield, high seamless steel product size, and surface accuracy, especially for high-precision seamless and extremely thin-walled seamless tube . 　　Due to limitations mill roll pass by the number and cost of finished product specifications can not be too much; cold-rolled and cold drawn joint production process to produce the finished product, with good quality steel processing cycle time is short, reduce intermediate degreasing, heat treatment, faint, Jiao straight processes, saving energy, reducing metal consumption, less raw material specifications and so on. Petroleum cracking tube can be c...

　　Requirements for API 5L X52 seamless tube in standard. 　　1. there are no cracks, wrinkles, wrinkles, spalling, crusts and scales on the inside and outside surfaces of the steel pipes. These defects should be completely eliminated. The grinding of surface defects should be smooth and smooth. The depth of clearance should not exceed the negative deviation of nominal wall thickness. The actual thickness of the defect removal zone should not be less than the minimum allowable wall thickness of the steel tube. The welding method should not be used. 　　2. the straight path of the inside and outside surface of the steel pipe must be grind. The depth of clearance should not exceed the negative deviation of nominal wall thickness. The actual thickness of the defect clearance area should not be less than the allowable minimum wall thickness of the steel pipe. 　　3. end shape: cut both ends of the steel pipe into right angles and remove burrs. 　　The welding interface is not allowed on the...