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Q345R seamless steel pipe chemical composition
C: 0.12 to 0.20; Mn: 1.20 to 1.60; Si: 0.20 to 0.55; Tensile strength: 470 to 660 N/mm; yield strength: 275 to 345 N/mm; elongation: 21%. The specific value should be based on the thickness or diameter of the steel. The above data corresponds to the thickness or diameter of the steel: 16~100mm
The purpose of the Q345R seamless pipe is to use "16Mnq" as the special steel grade for the bridge, "16MnL" as the special steel grade for the automobile girder, and "Q345R" as the special steel grade for pressure vessels.
Q345R seamless pipe standard
GB8163-1999 (for conveying fluid) GB6479-2000 (seamless steel pipe for high-pressure fertilizer equipment) This kind of steel is to improve the mechanical properties of steel by adjusting the amount of carbon (C). Therefore, according to the level of carbon content, such 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 between 0.25 ~ 0.60%, such as 35,45 steel; High-carbon steel - carbon content is generally greater than 0.60%. This type of steel is generally not used to make steel pipes.
Q345R seamless tube weight calculation formula
[(Outer Diameter - Wall Thickness) * Wall Thickness] * 0.02466 = kg/meter (weight per meter)
The knowledge of the steel pipe was issued.
Q345R seamless steel tube alias 16mnr seamless tube
Q345R seamless steel pipe alias 16mnr seamless pipe, its carbon content of 0.1% -0.25%, adding the main alloying elements manganese, silicon, vanadium, tantalum and titanium; its total alloy content <3%. It is divided into four levels of 300, 350, 400 and 450 MPa according to intensity. There are mainly Q295, Q345, Q390, Q420, Q460. "Q" is the Chinese Pinyin capitalized initial of the yielding "Qu", and the subsequent number is the value of the minimum yield point (σs) of this grade. The following symbol is according to the content of the impurity elements (sulphur and phosphorus) of the steel. It is divided into A, B, C, D, etc. with low carbon content and manganese content. Which A, B grade steel is usually called Q345r