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我国原有三级钢筋的材质为25MnSi,达不到要求的σs=420MPa、σb=600MPa 的强度级别,且焊接性能不够理想。为此,研究了不同加钛量对其组织性能的影响,其结论如下。在0～0.038%Ti 的范围内,每增加0.01%Ti,σs 可增加2.11MPa,加0.038%Ti可满足要求的强度级;加钛钢轧后穿水冷却时,塑性虽有所降低,但δ_s 仍能满足要求值(14%);加入钢中的钛可部分代替C、Mn、Si,改善了焊接性能,并降低成本;在1050℃轧制时,加0.14%Ti 钢与不加钛钢的单位压力相近,在一般轧机上即可轧制;加钛可形成TiN,加热时有阻止奥氏体晶粒粗化作用,使原始奥氏体晶粒细化两级左右,粗化温度提高150℃以上;TiN 和TiC 有阻止再结晶的作和,使再结晶后晶粒细化,有阻止奥氏体和铁素体晶粒长大的作用,细化铁素体晶粒;TiN 和TiC 具有沉淀强化作用,可提高钢的强度。根据试验结果,生产了加钛三级钢筋,经国家鉴定认为,达到了工业发达国家标准中相应级别的钢筋水平.
China’s original three steel material is 25MnSi, less than the required σs = 420MPa, σb = 600MPa strength level, and the welding performance is not ideal. To this end, the effects of different amounts of titanium on the microstructure and properties of the study, the conclusions are as follows. In the range of 0-0.038% Ti, the σs increases by 2.11MPa for every 0.01% increase of Ti, and 0.038% Ti can meet the required strength level. Although the plasticity decreases when titanium is added and water is cooled after rolling, δ_s can still meet the required value (14%); adding titanium in steel can partially replace C, Mn and Si, improving the welding performance and reducing the cost; when rolling at 1050 ℃, adding 0.14% Ti steel and no titanium Unit of steel pressure is similar, in the general rolling mill can be rolled; titanium can be formed TiN, austenite grain to prevent the coarsening of the role of heating, the original austenite grain refinement of about two, coarsening temperature Increase over 150 ℃; TiN and TiC prevent recrystallization and make grain refinement after recrystallization, prevent the growth of austenite and ferrite grain size, refine ferrite grains; TiN And TiC has a precipitation strengthening effect, can improve the strength of steel. According to the test results, the production of titanium plus titanium three, identified by the state that reached the standards of industrialized countries, the corresponding level of steel reinforcement level.