Q345B is a steel pipe material. Q stands for the yield of this material, and 345 refers to the yield value of this material. Q345B steel pipe is 16Mn steel pipe, which is one of the seamless steel pipe products.
16Mn is a material in steel. In the past, a name for steel. The current name is: Q345B.
16Mn belongs to the low-alloy steel series. In this series, it is the most common material or grade of steel plate.
What Q345B steel pipe represents is that the carbon content in this steel is about 0.16%. Mn was proposed separately because of the high content of manganese among the five major elements (carbon C, silicon Si, manganese Mn, phosphorus P, and sulfur S). It is about 1.20-1.60%.
Special treatment
Heat treatment: controlled rolling, normalizing, etc.
Z-direction performance: Z15, Z25, Z35
Main features
Good overall performance, good low temperature performance, good punching performance, welding performance and machinability
Steel tube weight formula
[(Outer diameter-Wall thickness)*Wall thickness]*0.02466=kg/m (weight per meter)
Process flow
Sanitary mirror tube process flow:
Tube blank-inspection-peeling-inspection-heating-perforation-pickling-grinding-lubrication and air drying-welding head-cold drawing-solution treatment-pickling-pickling Passivation-inspection-cold rolling-degreasing-cutting head-air drying-internal polishing-external polishing-inspection-marking-finished product packaging
Industrial pipe process
Tube blank-inspection-peeling-inspection-heating-piercing-pickling-mushroom trimming-lubrication and air drying-welding head-cold drawing-solution treatment-pickling-pickling Passivation-inspection
Q345B Steel Pipe specification:
| Q345B Steel Pipe | Q345B Steel Pipe | Q345B Steel Pipe | Q345B Steel Pipe |
| Size(MM) OD*THK | Size(MM) OD*THK | Size(MM) OD*THK | Size(MM) OD*THK |
| 22*2.5 | 89*6 | 133*7 | 245*12 |
| 25*2.5 | 89*6 | 133*7 | 273*8 |
| 25*4.5 | 89*6.5 | 133*8 | 273*10 |
| 32*3 | 89*7 | 133*9 | 273*10 |
| 42*4 | 89*7 | 133*10 | 273*12 |
| 45*3 | 89*8 | 133*10 | 273*14 |
| 45*4 | 89*10 | 140*6 | 299*8 |
| 50*4 | 89*12 | 140*8 | 299*10 |
| 50*5 | 89*13 | 146*8 | 299*12 |
| 51*4.5 | 95*4 | 159*6 | 299*16 |
| 57*3.5 | 95*5 | 159*10 | 325*8.5 |
| 57*4 | 95*5.5 | 159*12 | 325*12 |
| 57*5 | 95*8 | 168*6 | 325*14 |
| 60*3 | 102*5.5 | 168*7 | 325*16 |
| 60*3.2 | 102*6 | 168*8 | 351*9 |
| 60*5 | 102*7 | 168*8 | 351*10 |
| 63.5*5 | 102*14 | 168*10 | 351*14 |
| 65*4 | 102*16 | 168*12 | 351*14 |
| 67*5.5 | 108*4 | 180*6 | 351*16 |
| 68*3 | 108*5 | 180*8 | 356*8 |
| 70*5 | 108*7 | 180*8 | 377*14 |
| 70*7 | 108*8 | 180*10 | 402*9 |
| 73*3.5 | 108*13 | 180*12 | 402*10 |
| 73*5 | 114*4 | 180*16 | 402*12 |
| 73*6.5 | 114*5 | 194*6 | 402*14 |
| 76*3 | 114*5.5 | 194*8 | 402*16 |
| 76*3.5 | 114*6 | 194*8 | 426*12 |
| 76*4 | 114*6 | 194*10 | 426*14 |
| 76*4 | 114*6.5 | 194*12 | 426*16 |
| 76*5 | 114*7 | 203*10 | 426*18 |
| 76*6 | 114*7 | 203*12 | 426*20 |
| 83*6 | 114*8 | 219*6 | |
| 83*8 | 114*10 | 219*8 | 530*10 |
| 89*4 | 114*16 | 219*10 | 530*14 |
| 89*4.5 | 121*5 | 219*12 | 530*16 |
| 89*4.5 | 121*6 | 219*12 | 530*18 |
| 89*5 | 121*6 | 219*14 | 560*14 |
| 89*5 | 121*7 | 219*16 | 560*18 |
| 89*5 | 121*12 | 245*8 | 560*20 |
| 89*5.5 | 133*6 | 245*10 | 610*12 |
