Seamless steel pipe in the market has a wide range of applications, such as the transport of oil, natural gas, gas, water and some of the solid material of the pipeline, etc.. Seamless steel pipe is common in our daily life can be common to the pipe, but also has a lot of models, we common seamless steel pipe material 10#20# symbol, then the seamless steel pipe material 10#20# symbol is what meaning?

10#20# means 10 and 20 of their carbon content. In 10C, GB9948 content of 0.07-0.14 and 20C content of 0.17-0.24.C content, the higher the hardness and strength, the higher the toughness and plasticity will be lower, the higher the better. So the pressure vessel steel, C content can not exceed 0.25%. 20 steel in the expansion, not easy to crack, but in the design, 10 steel more than 20 steel, because of its use of small 10# steel welded better