表面溫度波動對微合金鋼連鑄板坯熱塑性的影響

杜辰偉; 文進; 李陽; 蘭鵬; 劉春秀; 張曉峰; 張家泉

doi:10.13374/j.issn2095-9389.2015.11.007

表面溫度波動對微合金鋼連鑄板坯熱塑性的影響

doi: 10.13374/j.issn2095-9389.2015.11.007

杜辰偉^1,2, ,,
文進³,
李陽⁴,
蘭鵬^1,2,
劉春秀^1,2,
張曉峰^1,2,
張家泉^1,2

1. 北京科技大學鋼鐵冶金新技術國家重點實驗室, 北京 100083;
2. 北京科技大學冶金與生態工程學院, 北京 100083;
3. 中信戴卡股份有限公司, 秦皇島 066011;
4. 武漢科技大學鋼鐵冶金及資源利用省部共建教育部重點實驗室, 武漢 430081

基金項目:

鋼鐵冶金新技術國家重點實驗室資助項目(41603013)

詳細信息

通訊作者:
杜辰偉,E-mail:dudegh@163.com

中圖分類號: TF777.1
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- 被引次數: 0
出版歷程
- 收稿日期: 2014-06-28
- 網絡出版日期: 2021-07-10

Influence of surface temperature fluctuations on the hot ductility of microalloyed steel slabs during continuous casting

1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3. CITIC Dicastal Co., Ltd., Qinhuangdao 066011, China;
4. Key Laboratory for Ferrous Metallurgy and Resources Utilization of the Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081 China

摘要

摘要: 由于鑄坯表面與二冷輥列夾持輥發生的間斷式接觸傳熱,其表面溫度存在一定程度的上下波動.基于J55微合金鋼,考慮溫度波動的影響,研究了鋼在不同熱狀態下的熱塑性.結果表明,高于850℃時溫度波動制度下測得的斷面收縮率低于常規恒溫制度下的測量值,而等于或低于850℃時情況相反.分析了兩種不同溫度制度下測試結果的差異,認為對于微合金鋼,存在著略高于所測鋼種Ae₃溫度的某一分界溫度,高于該溫度時恒溫制度下測得的塑性值相比波動制度下塑性值偏高,而低于該溫度時則偏低.這一認識有助于更加合理地制定實際連鑄過程的矯直溫度.
- 連鑄 /
- 微合金鋼 /
- 溫度波動 /
- 熱塑性
Abstract: Temperature fluctuations exist on the slab surface due to unstable heat flux during repeated contact and departure between the hot slab surface and the relatively cold supporting rollers in the secondary cooling zone. Considering thermal oscillations,hot ductility test under different thermal conditions was carried out on J55 microalloyed steel. The results show that at a temperature higher than 850℃,the hot ductility under the oscillating condition is lower than that under the isothermal condition,but it is on the contrary when the temperature equals or falls below 850℃. By analyzing results from experiment and from literature comprehensively,for the microalloyed steel,it is inferred that there exists a critical temperature a bit higher than the Ae₃ temperature. Above this critical temperature the hot ductility under the isothermal condition is higher than that measured by the more accurate oscillating way,while below it the result is opposite. This conclusion is meaningful to determine the straightening temperature for microalloyed steel production during continuous casting.
- continuous casting /
- microalloyed steel /
- temperature fluctuations /
- hot ductility