Bending and Straightening of a Medium Carbon Steel Continuous Casting Slab with Low Temperature End Plastic Groove
The high temperature brittleness range of medium carbon microalloyed steel under an actual continuous casting process was determined by the high temperature tensile test. The test results revealed that only a third of the brittle temperature range from 650–825 °C was due to intergranular ferrite in...
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MDPI AG
2022-04-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/7/2609 |
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| author | Jingbo Yang Fujun Zhang Jingshe Li Wei Liu Tiantian Wang Hang Yuan Daqiang Cang |
| author_facet | Jingbo Yang Fujun Zhang Jingshe Li Wei Liu Tiantian Wang Hang Yuan Daqiang Cang |
| author_sort | Jingbo Yang |
| collection | DOAJ |
| description | The high temperature brittleness range of medium carbon microalloyed steel under an actual continuous casting process was determined by the high temperature tensile test. The test results revealed that only a third of the brittle temperature range from 650–825 °C was due to intergranular ferrite in the experimental steel. In addition, it was found that the plastic recovery was fast and stable when the temperature was lower than 725 °C (the lowest plastic temperature). Bending/straightening operation in this temperature range was conducive to controlling the generation of corner cracks. In order to keep the corner temperature at the low temperature end of the plastic curve when the slab was bent/straightened, the cooling water scheme of the secondary cooling zone of the continuous caster was formulated by numerical calculation. By appropriately increasing the cooling water flow in the foot roll and the secondary cooling zones 1–5, the corner temperature of slab during bending operation was 600–700 °C, avoiding the brittle temperature range. The industrial test was then carried out. The results showed that after using the optimized water volume, the corner grains of the slab were uniform and the microstructure was mainly pearlite + ferrite. In addition, the abnormally large grain size was reduced, and a large amount of ferrite was generated inside the grain, which avoided stress concentration at the corner of the slab during bending/straightening operation, and basically eliminated the corner crack of the slab. |
| first_indexed | 2024-03-09T11:40:45Z |
| format | Article |
| id | doaj.art-ede5655cc4b34c6790fb695e5d5c94ea |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:40:45Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-ede5655cc4b34c6790fb695e5d5c94ea2023-11-30T23:34:31ZengMDPI AGMaterials1996-19442022-04-01157260910.3390/ma15072609Bending and Straightening of a Medium Carbon Steel Continuous Casting Slab with Low Temperature End Plastic GrooveJingbo Yang0Fujun Zhang1Jingshe Li2Wei Liu3Tiantian Wang4Hang Yuan5Daqiang Cang6School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100080, ChinaSchool of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100080, ChinaSchool of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100080, ChinaSchool of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100080, ChinaSchool of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100080, ChinaSchool of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100080, ChinaSchool of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100080, ChinaThe high temperature brittleness range of medium carbon microalloyed steel under an actual continuous casting process was determined by the high temperature tensile test. The test results revealed that only a third of the brittle temperature range from 650–825 °C was due to intergranular ferrite in the experimental steel. In addition, it was found that the plastic recovery was fast and stable when the temperature was lower than 725 °C (the lowest plastic temperature). Bending/straightening operation in this temperature range was conducive to controlling the generation of corner cracks. In order to keep the corner temperature at the low temperature end of the plastic curve when the slab was bent/straightened, the cooling water scheme of the secondary cooling zone of the continuous caster was formulated by numerical calculation. By appropriately increasing the cooling water flow in the foot roll and the secondary cooling zones 1–5, the corner temperature of slab during bending operation was 600–700 °C, avoiding the brittle temperature range. The industrial test was then carried out. The results showed that after using the optimized water volume, the corner grains of the slab were uniform and the microstructure was mainly pearlite + ferrite. In addition, the abnormally large grain size was reduced, and a large amount of ferrite was generated inside the grain, which avoided stress concentration at the corner of the slab during bending/straightening operation, and basically eliminated the corner crack of the slab.https://www.mdpi.com/1996-1944/15/7/2609continuous castingmedium carbon microalloyed steelcorner transverse crackthird brittle interval |
| spellingShingle | Jingbo Yang Fujun Zhang Jingshe Li Wei Liu Tiantian Wang Hang Yuan Daqiang Cang Bending and Straightening of a Medium Carbon Steel Continuous Casting Slab with Low Temperature End Plastic Groove Materials continuous casting medium carbon microalloyed steel corner transverse crack third brittle interval |
| title | Bending and Straightening of a Medium Carbon Steel Continuous Casting Slab with Low Temperature End Plastic Groove |
| title_full | Bending and Straightening of a Medium Carbon Steel Continuous Casting Slab with Low Temperature End Plastic Groove |
| title_fullStr | Bending and Straightening of a Medium Carbon Steel Continuous Casting Slab with Low Temperature End Plastic Groove |
| title_full_unstemmed | Bending and Straightening of a Medium Carbon Steel Continuous Casting Slab with Low Temperature End Plastic Groove |
| title_short | Bending and Straightening of a Medium Carbon Steel Continuous Casting Slab with Low Temperature End Plastic Groove |
| title_sort | bending and straightening of a medium carbon steel continuous casting slab with low temperature end plastic groove |
| topic | continuous casting medium carbon microalloyed steel corner transverse crack third brittle interval |
| url | https://www.mdpi.com/1996-1944/15/7/2609 |
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