carbon steel tubes for general structural purposesThe material of carbon structural tube is the standard material of carbon structural steel (GB/700-1999).This kind of steel is generally smelted by converter or open hearth furnace. Its main raw material is molten iron plus scrap steel. The content of sulfur and phosphorus in the steel is higher than that of high-quality carbon structural steel.
This kind of steel improves the mechanical properties of steel by adjusting the carbon content (C). Therefore, according to the carbon content, this kind 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 0.25~0.60%, such as 35 and 45 steel;
High carbon steel - carbon content is generally greater than 0.60%.This type of steel is not normally used to make steel pipes.
In fact, there is no clear limit between them.
This kind of steel production is large, the use is wide, generally rolling (forging) into round, square, flat profile, plate and seamless steel pipe.It is mainly used in the manufacture of general structure and mechanical structure parts as well as building structural parts and pipelines for conveying fluid.Sometimes heat treatment (normalizing or tempering) is required for use.
Chemical composition of structural steel tube, %
method of deoxidation
be not more than
Main materials of high quality carbon steel pipes :Q195, Q215A, B, Q235A, B, C, D, Q255A, B,Q275
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