St52-3
Non alloy steel is regarded as ordinary structural steel, which is mainly characterized by tensile strength and yield point. It is used in civil construction, underground engineering, bridge structure, marine structure, container manufacturing, automobile and machine manufacturing.
The steel grade is generally composed of the letter st, the characteristic value of the steel and the quality index. For example, St52-3. For the steel grade with certain selection requirements for deoxidation method, the corresponding mark (U or R) is placed in front of the steel grade. For example: ust37-2 or rst37-2Small brand st37-2 st37-3u st37-3n replaces 20 steel St37 is a German brand, but it is a general brand and several small brands. Such as st37-2, st37-3u, st37-3n, rst-2, ust37-2, etc. St37-2 is a brand of carbon structural steel in Germany This material is equivalent to carbon structural steel Q235B (old brand number: a3-b) in China In addition, because this steel is similar to China's high-quality carbon structural steel 20 steel, it can also be replaced by 20 steel. High pressure seamless steel pipe and high pressure boiler pipe are a kind of boiler pipe, belonging to the category of seamless steel pipe. The manufacturing method is the same as that of seamless pipe, but there are strict requirements for the steel grade used in the manufacture of steel pipe. High pressure boiler tubes are often used under high temperature and high pressure conditions. High pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air ducts, main steam tubes, etc. of high-pressure and ultra-high-pressure boilers.