發(fā)布時間：2018-07-02 12:53

  本文選題：低溫鋼筋 + 溫度場��； 參考：《鋼鐵》2015年07期

【摘要】：根據(jù)低溫鋼筋穿水冷卻工藝特點,利用現(xiàn)場實測數(shù)據(jù)并結(jié)合理論分析得到不同規(guī)格低溫鋼筋穿水冷卻過程中的對流換熱系數(shù)。采用MSC Marc有限元軟件與現(xiàn)場試制結(jié)果對低溫鋼筋穿水冷卻過程進行了研究。研究了冷卻水流量、終軋溫度、穿水時間等工藝參數(shù)對低溫鋼筋溫度場和組織演變的影響。模擬結(jié)果表明:當冷卻水流量為120 m3/h時,鋼筋芯部開始有珠光體轉(zhuǎn)變;當冷卻水流量為400 m3/h時,鋼筋芯部無鐵素體轉(zhuǎn)變;冷卻水流量為160~200 m3/h時,所獲得的組織為針狀鐵素體與貝氏體。終軋溫度增加50℃,出水冷裝置后鋼筋表面溫度約增加10℃,返紅溫度約增加30℃;在200 m3/h水流量下冷卻1.2 s,終軋溫度為1 050℃時,其芯部組織為針狀鐵素體與細小的貝氏體。在相同水壓與水流量條件下,隨著穿水速度的增加,淬透層深度減小,返紅溫度增加。
[Abstract]:According to the process characteristics of transwatered cooling of low temperature steel bar, the convection heat transfer coefficient of low temperature steel bar during the process of water cooling is obtained by using field measured data and theoretical analysis. In this paper, MSC Marc finite element software and field trial production results are used to study the transwatered cooling process of low temperature steel bars. The effects of cooling water flow rate, finishing rolling temperature and water passing time on the temperature field and microstructure evolution of low temperature steel bar were studied. The simulation results show that when the cooling water flow rate is 120 m3 / h, the pearlite transition begins to occur in the steel core; when the cooling water flow rate is 400 m3 / h, there is no ferrite transition in the steel core; and the cooling water flow rate is 160 ~ 200 m3 / h. The microstructure obtained is acicular ferrite and bainite. The final rolling temperature increases 50 鈩，

本文編號：2090188