Cold Brittle of Seamless Steel Tubes

Cold brittle of seamless steel tube are: solid solution strengthening elements. High ductility-brittle transition temperature is very strong; there are molybdenum, titanium and vanadium; low content of low and high content of toughness when a brittle transition temperature of the elements of silicon, chromium and copper; reduce toughness-brittle transformation Temperature of nickel, the first increase after the reduction of a brittle transition toughness of manganese.

Forming an element of the second phase. The important elements with the second phase to increase the cold-rolled precision steel tube cold brittle is carbon, with the increase of carbon content in the cold rolling precision steel pipe and the increase of pearlite content in cold-rolled precision steel pipe, the average increase of 1% pearlite volume, the average ductility-brittleness transformation temperature increased by 2.2 ℃. Effect of carbon content in ferrite - pearlitic steel on brittleness. The addition of titanium, niobium and vanadium and other micro-alloying elements, the formation of the dispersion of nitride or carbonitride, causing cold-rolled precision steel tube toughness of a brittle transition temperature increase in grain size affect the toughness of a brittle transition temperature, with grain thick, A ductile-brittle transition temperature increases. Refining the grain reduces the cold-brittle tendency of the cold-rolled precision bright steel pipe, which is widely used method.