The performance of cold drawn steel pipes is much higher than that of ordinary seamless steel pipes. Because this steel pipe contains more Cr, its high temperature resistance, low temperature resistance, and corrosion resistance are not comparable to other seamless steel pipes. Therefore, alloy pipes are used in petroleum , Aerospace, chemical, electric power, boiler, military and other industries are widely used.
It is mainly different from the production standard of alloy tube and its industry. Annealing and tempering the Q345C alloy tube changes its mechanical properties. Reach the required processing conditions. Its performance is higher than that of ordinary seamless steel pipes. The chemical composition of alloy pipes contains more Cr, and it has high temperature resistance, low temperature resistance and corrosion resistance. Common carbon seamless pipes do not contain alloy components or have few alloy components. The reason why alloy pipes are widely used in petroleum, aerospace, chemical, electric power, boiler, military and other industries is because the mechanical properties of alloy pipes change and adjust.
Cold drawn steel pipes are low-alloy high-strength structural steels. According to their strength, they are divided into four levels: 300, 350, 400 and 450MPa. There are mainly Q295, Q345, Q390, Q420, Q460. : "Q" is the initial Chinese pinyin of the word "qu" for yielding, and the following number is the minimum yield point (σs) value of the grade, and the following symbol is based on the increase in the content of impurity elements (sulfur, phosphorus) of the steel It is divided into four grades A, B, C, D when it is low and with the change of carbon and manganese elements. Among them, A and B grade steel is usually called 16Mn
Chemical composition of cold drawn 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%. The specific value depends on the thickness or diameter of the steel. The above data corresponds to the thickness or diameter of the steel: 16~100mm
use
The special steel grade for bridges is "16Mnq", the special steel grade for automobile beams is "16MnL", and the special steel grade for pressure vessels is "16MnR".
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