Effect of inclusions on DWTT properties of thick gauge X80 hot rolled steel strip
The 22 mm thick X80 hot-rolled coil production process replaces the traditional wide and thick plate production process, which has remarkable advantages in improving the yield, reducing the cost of manufacturing, and improving the outer diameter adjustment of pipeline.Aiming at the unqualified probl...
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Science Press
2018-12-01
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| Series: | 工程科学学报 |
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| Online Access: | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2018.s1.001 |
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| author | WANG Hao BAO Yan-ping WANG Min LIN Lu LI Zhao WEI Xiao-dong |
| author_facet | WANG Hao BAO Yan-ping WANG Min LIN Lu LI Zhao WEI Xiao-dong |
| author_sort | WANG Hao |
| collection | DOAJ |
| description | The 22 mm thick X80 hot-rolled coil production process replaces the traditional wide and thick plate production process, which has remarkable advantages in improving the yield, reducing the cost of manufacturing, and improving the outer diameter adjustment of pipeline.Aiming at the unqualified problem of low temperature drop weight tear resistance (DWTT) of products during development and trial production, the morphology of brittle fracture and the segregation degree of composition in slab thickness direction at different proportions were systematically analyzed by scanning electron microscopy (SEM) .It is concluded that the distribution of sulphide and Ca O·Al<sub>2</sub>O<sub>3</sub>calcium aluminate composite inclusions at the fracture site is more than that of Ca O·Al<sub>2</sub>O<sub>3</sub>calcium aluminate composite inclusions, and the large size effects the drop weight tear resistance performance of X80 pipeline.Also the relationship between high nitrogen content in molten steel and the decrease of drop weight tear resistance performance was analyzed.Moreover, the steel strip manganese sulfide segregation destruction of tissue continuity, easy to become a source of ductile brittle fracture crack.Through the optimization of refining Ca wire feeding technology and the protective casting technology in continuous casting process, improving the centerline segregation degree, decreasing the number of inclusions in steel, can effectively improve the performance of drop weight tear resistance, to achieve a stable development and production of 22-mm thick X80 pipeline steel hot rolled steel strip. |
| format | Article |
| id | doaj-art-43b710594b2c41dc98db76fe010a071b |
| institution | OA Journals |
| issn | 2095-9389 |
| language | zho |
| publishDate | 2018-12-01 |
| publisher | Science Press |
| record_format | Article |
| series | 工程科学学报 |
| spelling | doaj-art-43b710594b2c41dc98db76fe010a071b2025-08-20T01:47:55ZzhoScience Press工程科学学报2095-93892018-12-0140S111010.13374/j.issn2095-9389.2018.s1.001Effect of inclusions on DWTT properties of thick gauge X80 hot rolled steel stripWANG HaoBAO Yan-ping0WANG Min1LIN Lu2LI Zhao3WEI Xiao-dong41. State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing;1. State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing;3. Metallurgical Technology Institute,Central Iron and Steel Research Institute2. Rare Earth Steel Plates Plant,Baotou Iron and Steel Co Ltd;2. Rare Earth Steel Plates Plant,Baotou Iron and Steel Co Ltd;The 22 mm thick X80 hot-rolled coil production process replaces the traditional wide and thick plate production process, which has remarkable advantages in improving the yield, reducing the cost of manufacturing, and improving the outer diameter adjustment of pipeline.Aiming at the unqualified problem of low temperature drop weight tear resistance (DWTT) of products during development and trial production, the morphology of brittle fracture and the segregation degree of composition in slab thickness direction at different proportions were systematically analyzed by scanning electron microscopy (SEM) .It is concluded that the distribution of sulphide and Ca O·Al<sub>2</sub>O<sub>3</sub>calcium aluminate composite inclusions at the fracture site is more than that of Ca O·Al<sub>2</sub>O<sub>3</sub>calcium aluminate composite inclusions, and the large size effects the drop weight tear resistance performance of X80 pipeline.Also the relationship between high nitrogen content in molten steel and the decrease of drop weight tear resistance performance was analyzed.Moreover, the steel strip manganese sulfide segregation destruction of tissue continuity, easy to become a source of ductile brittle fracture crack.Through the optimization of refining Ca wire feeding technology and the protective casting technology in continuous casting process, improving the centerline segregation degree, decreasing the number of inclusions in steel, can effectively improve the performance of drop weight tear resistance, to achieve a stable development and production of 22-mm thick X80 pipeline steel hot rolled steel strip.http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2018.s1.001thick hot rolled steel stripdrop weight tear resistanceinclusionsdrop hammer tear fracture |
| spellingShingle | WANG Hao BAO Yan-ping WANG Min LIN Lu LI Zhao WEI Xiao-dong Effect of inclusions on DWTT properties of thick gauge X80 hot rolled steel strip 工程科学学报 thick hot rolled steel strip drop weight tear resistance inclusions drop hammer tear fracture |
| title | Effect of inclusions on DWTT properties of thick gauge X80 hot rolled steel strip |
| title_full | Effect of inclusions on DWTT properties of thick gauge X80 hot rolled steel strip |
| title_fullStr | Effect of inclusions on DWTT properties of thick gauge X80 hot rolled steel strip |
| title_full_unstemmed | Effect of inclusions on DWTT properties of thick gauge X80 hot rolled steel strip |
| title_short | Effect of inclusions on DWTT properties of thick gauge X80 hot rolled steel strip |
| title_sort | effect of inclusions on dwtt properties of thick gauge x80 hot rolled steel strip |
| topic | thick hot rolled steel strip drop weight tear resistance inclusions drop hammer tear fracture |
| url | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2018.s1.001 |
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