16mn seamless steel pipe is one of the materials of seamless steel pipe. Now we all call it Q345B seamless steel pipe. The similar materials are Q345C, Q345D and Q345E. The quality grade symbol ABCDE indicates that impact test is not required. The impact test temperature is+20 ° 0 ° - 20 ° 40 °.
Yield strength and chemical composition of 16mn seamless steel pipe:
16mn seamless steel pipe is a low alloy high-strength structural steel, with a carbon content of 0.1% - 0.25%. The main alloy elements such as manganese, silicon, vanadium, silver and titanium are added; Its total alloy content is less than 3%. According to the strength, it can be divided into four levels: 300, 350, 400 and 450MPa. It mainly includes Q295, Q345, Q390, Q420 and Q460.
"Q" is the initial of the Chinese phonetic alphabet of the yielding character "Qu", followed by the number of the minimum yield point (as) value of the brand, and the following symbol is divided into A, B, C, D according to the content of impurity elements (sulfur, phosphorus) in the steel from high to low, accompanied by changes in carbon and manganese.
Chemical composition of 16Mn seamless steel 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%.
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