夾雜物對厚規格X80熱軋鋼帶DWTT性能的影響

王皓; 包燕平; 王敏; 林路; 李釗; 魏曉東

doi:10.13374/j.issn2095-9389.2018.s1.001

夾雜物對厚規格X80熱軋鋼帶DWTT性能的影響

doi: 10.13374/j.issn2095-9389.2018.s1.001

王皓^1,2,
包燕平^1, ,,
王敏¹,
林路³,
李釗²,
魏曉東²

1. 北京科技大學鋼鐵冶金新技術國家重點實驗室;
2. 包鋼稀土鋼板材廠;
3. 鋼鐵研究總院冶金工藝研究所

詳細信息

通訊作者:
包燕平, E-mail:baoyp@ustb.edu.cn

中圖分類號: TG335
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出版歷程
- 收稿日期: 2018-02-22
- 網絡出版日期: 2023-07-18

Effect of inclusions on DWTT properties of thick gauge X80 hot rolled steel strip

1. State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing;
2. Rare Earth Steel Plates Plant,Baotou Iron and Steel Co Ltd;
3. Metallurgical Technology Institute,Central Iron and Steel Research Institute

摘要

摘要: 采用22 mm厚X80熱軋鋼帶替代傳統寬厚板平板的生產工藝, 在實現提高成材率、降低工程制造成本及提高管線外徑可調節性方面具有顯著的優勢.本文針對開發試制過程中出現產品低溫抗落錘撕裂性能 (DWTT) 不合格問題, 通過掃描電鏡 (SEM) 對不同比例脆性斷口形貌以及鑄坯厚度方向成分偏析程度進行系統分析, 得出斷口處硫化物與Ca O·Al₂O₃鈣鋁酸鹽復合夾雜物分布較多, 尺寸過大對X80管線鋼抗落錘撕裂性能造成了影響, 進而分析了鋼水氮含量高對應抗落錘撕裂性能下降的關系, 同時鋼材中長條狀硫化錳偏聚破壞組織連續性, 易成為韌脆性斷口裂紋的根源.通過優化精煉Ca線喂入工藝、連鑄過程保護澆鑄, 及改善鑄坯中心偏析程度, 減小了鋼中夾雜物數量, 有效提高了產品抗落錘撕裂性能, 實現了穩定開發生產22 mm厚X80管線鋼熱軋鋼帶.
- 厚熱軋鋼帶 /
- 抗落錘撕裂 /
- 夾雜物 /
- 落錘撕裂斷口
Abstract: 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·Al₂O₃calcium aluminate composite inclusions at the fracture site is more than that of Ca O·Al₂O₃calcium 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.
- thick hot rolled steel strip /
- drop weight tear resistance /
- inclusions /
- drop hammer tear fracture

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參考文獻(16)

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