Detailed introduction of 16Mn seamless pipe

16Mn seamless steel pipe is a relatively important material for seamless steel pipe, and it is also a relatively useful steel. Recently, especially in capital construction pipelines, houses, and railway bridges, it has given full play to a relatively huge effect. Generally, the original factory paints the color code on the outer surface of the pipe fittings. There is very little difference from the general carbon steel appearance estimation. The color of 16Mn turns black and dark. Generally, seamless steel pipes are made of 10, 20, 30, 35, 45 and other high-quality carbon steels such as 16Mn, 5MnV and other low-alloy steels or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other composite steels by hot rolling or cold rolling.
16Mn seamless pipe
　　 is a material in steel. In the past, a name for steel. The current name is: Q345.
　　16, it represents 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%.
According to the strength, it is divided into 4 levels of 300, 350, 400 and 450MPa. There are mainly Q295, Q345, Q390, Q420, Q460. : “Q” is the initial Chinese pinyin of the word “qu” for yielding, the following number is the minimum yield point (σs) value of the grade, and the following symbol is based on the increase in the content of impurity elements (sulfur, phosphorus) of the steel It is divided into four grades A, B, C, D when it is low and with the change of carbon and manganese elements. Among them, A and B grade steels are usually called 16Mn.
　　 16Mn belongs to the low alloy steel plate series, in this series, it is the steel plate of the most common material or brand.
There are many types of 16Mn seamless pipes, which are mainly divided into two categories. The first is seamless steel pipes, and the second is seamed steel pipes. Although there is only one word difference between these two types, their properties and uses are quite different. The most common one in our lives is 16mn seamless steel pipe.
16Mn seamless steel pipe process
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-air drying-internal polishing-external polishing-inspection-marking-finished product packaging
　　According to special requirements, some special treatments can be carried out on the steel plate: heat treatment and Z-direction properties.
　　 Heat treatment: controlled rolling, normalizing, etc.
　　Z-direction performance: Z15, Z25, Z35
　　Main characteristics: good overall performance, good low temperature performance, good punching performance, welding performance and machinability.
　　 The chemical composition of 16Mn seamless pipe:
　　C: 0.12~0.20;
　　Mn: 1.20~1.60;
　　Si:0.20~0.55;
　　 Tensile strength: 470~660 N/mm2;
　　 Yield strength: 275~345 N/mm2;
　　 Elongation: 21%.
The specific value depends on the thickness or diameter of the steel. The above data corresponds to the thickness or diameter of the steel: 16~100mm
Where 16Mn seamless steel pipes and ordinary steel pipes are applicable:
1. Ground seam steel pipe for fluid: GB8163-2008
2. Seamless steel pipe for boiler: GB3087-2008
3. High pressure seamless pipe for boiler: GB5310-2008 (ST45.8-Ⅲ type)
4. High-pressure seamless steel pipes for fertilizer equipment: GB6479-1999
5. Seamless steel pipe for geological drilling: YB235-70
6. Seamless steel pipe for oil drilling: YB528-65
7. Seamless steel pipe for petroleum cracking: GB9948-88
8. Special seamless pipe for oil drill collar: YB691-70
9. Seamless steel pipe for automobile half shaft: GB3088-1999
10. Seamless steel pipe for ships: GB5312-1999
11. Cold-drawn cold-rolled precision seamless steel pipe: GB3639-1999
16Mn seamless steel pipe use:
The special steel grade for bridges is “16Mnq”, the special steel grade for automobile beams is “16MnL”, and the special steel grade for pressure vessels is “16MnR”.
16mn seamless pipe weight calculation formula:
[(Outer diameter-Wall thickness)*Wall thickness]*0.02466=kg/m (weight per meter)
This type of steel relies on adjusting the amount of carbon (C) to improve the mechanical properties of the steel. Therefore, according to the level of carbon content, this type of steel can be divided into:
Low carbon steel-carbon content is generally less than 0.25%, such as 10, 20 steel, etc.;
Medium carbon steel-carbon content is generally between 0.25 and 0.60%, such as 35, 45 steel, etc.;
High carbon steel-carbon content is generally greater than 0.60%. This type of steel is generally not used in the manufacture of steel pipes.