The use of No. 45 seamless steel tubes The Shandong Seamless Steel Tube Plant provides a number of classification methods. According to the manufacturing process classification: hot-rolled seamless tubes and cold-rolled seamless tubes. Classified by purpose: Seamless steel tubes for general structures, transport fluids Seamless steel tubes, seamless steel tubes for medium- and low-pressure boilers, and seamless steel tubes for high-pressure boilers, .... by materials: high-quality carbon structural steel seamless steel tubes, low-alloy structural steel seamless steel tubes, alloy steel Seamless steel tubes. Seamless steel tubes are used for a wide range of purposes, can be used to machine parts, used to transport liquids or gases, to make bearings, and to build rigid structures. In the sheet, Q345B is a low alloy series. In low alloy materials, this material is the most common. The former name of Q345B seamless steel pipe is: 16Mn seamless steel pipe. The external implementation standard of Q345B seamless steel pipe is: GB709, and the internal implementation standard is: GB/T1591-94. Similar to the Q345B naming method. Due to the implementation of standards, this steel plate allows negative tolerance delivery. Q345 seamless steel pipe is a kind of steel pipe material. Q stands for the yield of this material. The 345 behind it refers to the yield value of this material, which is around 345. And as the thickness of the material increases its yield value decreases. Q345A class is not to make impact; Q345B class is 20 degree normal temperature impact; Q345C class is 0 degree impact; Q345D class is -20 degree impact; Q345E class is -40 degree impact. At different impact temperatures, the impact value is also different. Q345A, Q345B, Q345C, Q345D, Q345E. This is the distinction of grades, which represents the difference between the temperature of the impact and the difference!
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