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Nb、Ti是管线钢中常用的合金元素。主要通过热处理和喷碳处理等手段研究了合金元素Nb、Ti的含量及加热制度对再加热奥氏体晶粒长大的影响。试验结果表明:试验钢在再加热过程中,奥氏体晶粒尺寸随加热温度升高而增大;在常规含铌钢中,为获得较小的加热态奥氏体晶粒,钛的质量分数应控制在一定范围内(0.010%~0.015%),钛含量过高或过低都对晶粒细化有不利影响。此外,在钛含量相同的情况下,高铌钢奥氏体晶粒长大明显,高铌钢的最佳钛含量范围也与常规含铌钢的最佳钛含量不同。
Nb, Ti is a common alloying element in pipeline steel. The effects of Nb and Ti content and heating regimes on the re-heated austenite grain growth were investigated by means of heat treatment and carbon spray treatment. The experimental results show that the austenite grain size increases with the increase of heating temperature in reheating the test steel. In the conventional niobium-containing steel, in order to obtain smaller austenite grains in the heated state, the mass of titanium Score should be controlled within a certain range (0.010% ~ 0.015%), titanium content is too high or too low have an adverse effect on grain refinement. In addition, the austenite grain growth of high-niobium steel is obvious at the same titanium content, and the optimal titanium content of high-niobium steel is also different from that of the conventional niobium-containing steel.