What is the material of hot-rolled seamless steel pipe? Seamless steel pipe is generally used: it is made of high-quality carbon-structured steel such as 10, 20, 30, 35, 45, 16Mn, 5MnV and other low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel Hot or cold rolled. Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid transportation pipelines.


The net inflow and outflow of rebar in various regions can be roughly estimated. First, North China has the largest net outflow because its output is greater than its consumption; secondly, Northeast China is also a net outflow area; East China has net outflows in all other years except 2003 and 2004; Central South, Northwest, and Southwest are all net inflows area.