Description
Q345B seamless steel pipe is a kind of steel material, which can be divided into Q345A, Q345B, Q345C, Q345D and Q345E according to grade. What they represent is that the impact temperature is different. Q345A, no impact; Q345B, 20 ° normal temperature impact; Q345C, 0 degree impact; Q345D, is - 20 degree impact; Q345E is - 40 degree impact. Classified by manufacturing process: hot rolled seamless pipe and cold rolled seamless pipe. According to the use classification, there are: seamless steel pipe for general structure, seamless steel pipe for fluid transmission, seamless steel pipe for medium and low pressure boiler and seamless steel pipe for high pressure boiler. By material: high quality carbon structural steel seamless steel pipe, low alloy structural steel seamless steel pipe, alloy steel seamless steel pipe. 1. Structural seamless pipe (GB / t8162-2018) is a seamless steel pipe for general structure and mechanical structure. 2. Seamless steel pipe for fluid transportation (GB / t8163-2018) is a general seamless steel pipe used to transport water, oil, gas and other fluids. 3. Seamless steel pipe for low and medium pressure boiler (gb3087-2018) is a high-quality carbon structural steel hot-rolled and cold drawn (rolled) seamless steel pipe used to manufacture superheated steam pipe, boiling water pipe for low and medium pressure boiler, superheated steam pipe and arch brick pipe for locomotive boiler. 4. Seamless steel pipe for high pressure boiler (gb5310-2018) is a high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipe used to manufacture the heating surface of water tube boiler with high pressure and above.Voice
In the seamless steel pipe series, there is a material called Q345B seamless steel pipe, which belongs to the low alloy series. Among low alloy materials, this material is the most common. Q345B seamless steel pipe used to be called 16Mn seamless steel pipe. There are many classification methods. According to the manufacturing process, there are: hot rolled seamless pipe and cold rolled seamless pipe. According to the purpose, there are: seamless steel pipe for general structure, seamless steel pipe for fluid transmission, seamless steel pipe for medium and low pressure boiler and seamless steel pipe for high pressure boiler. According to the material, there are: high-quality carbon structural steel seamless steel pipe, low-alloy structural steel seamless steel pipe and alloy steel seamless steel pipe. Seamless steel pipe is widely used, It can be processed into mechanical parts, used to transport liquid or gas, used as drive bearings, and used to build rigid structure buildings.
The external executive standard of Q345B seamless steel pipe is gb709 and the internal executive standard is GB / t1591-94. The naming method is similar to Q345B. Due to the implementation of the standard, this kind of steel plate is allowed to be delivered with negative tolerance.Q345 seamless steel pipe is a kind of steel pipe material. Q represents the yield of this material. The following 345 refers to the yield value of this material, which is about 345. The yield value decreases with the increase of material thickness. Q345A, no impact; Q345B, 20 ° normal temperature impact; Q345C, 0 degree impact; Q345D, is - 20 degree impact; Q345E is - 40 degree impact. At different impact temperatures, the impact values are also different. Q345A, Q345B, Q345C, Q345D, Q345E, This is the distinction of grades, which mainly represents that the impact temperature is different.