374 东北大学学报 ( 自然科学版 ) 第 34 卷 A A = A i 100 = PP i 100 A T PP T 1 1 A A % A i mm 2 A T mm 2 PP i 1 1 PP T 80 t 120 t RH 80 t 55SiCrA 120 t Q690

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1 第 34 卷第 3 期 2013 年 3 月东北大学学报 ( 自然科学版 ) Journal of Northeastern University( Natural Science) Vo l 34,No 3 Mar RH 王德永, 吕铭, 刘承军, 姜茂发 RH SEM RH RH 10 μm RH RH TF 77 A The Evolution and Behavior of the Non-metallic During the RH Refining Process Inclusions WNAG De-yong L Ming LIU Cheng-jun JIANG Mao-fa School of Materials & Metallurgy Northeastern University Shenyang China Corresponding author WANG De-yong wangdy@ smm neu edu cn Abstract Two sets of RH furnaces were taken as the main objects The specimens were sampled at different refining times The composition content and size distribution of the inclusions in steels were analyzed by means of metallographic microscope SEM and EDS and the collision growth and removal of the inclusions during RH refining process were discussed The results showed that the inclusion removal was very obvious during RH refining process and almost no inclusion with the dimension more than 10 μm were observed after the soft blowing With the increase of refining time the average size of inclusions changed little however the amount of inclusions significantly decreased The area ratio of inclusions in two type steels increased at first and then reduced In Si-Mn deoxidized steels silicate inclusions had a certain capacity of the sulphur the dual layer inclusions were therefore easier to form with the surface of sulphur-rich phase and the inner core of silicate phase As the strong mixture of the liquid steel in RH vacuum chamber solid inclusions were always captured by the liquid calcium aluminate and formed a typical inlaid feature Key words RH refining non-metallic inclusions evolution removal inlaid feature RH 1 - LF 3 80 t 120 t RH SEM /EDS RH BOF RH CC RH M

Northeastern University Shenyang 110819 China Corresponding author WANG De-yong E-mail wangdy@ smm neu edu cn Abstract Two sets of RH furnaces were taken as the main objects The specimens were

2 374 东北大学学报 ( 自然科学版 ) 第 34 卷 A A = A i 100 = PP i 100 A T PP T 1 1 A A % A i mm 2 A T mm 2 PP i 1 1 PP T 80 t 120 t RH 80 t 55SiCrA 120 t Q690D ipp SiCrA BOF 2 LF RH CC Si - Mn - Al SSX LF CaC 2 RH 120 Pa 20 min 15 min Q690D BOF LF RH CC Al RH RH 50 Pa 20 min 10 min 1 2 RH 3 ~5 min RH 2 10 μm 400 mm /2 10 mm 6 mm RH 55SiCrA SiCrA RH RH 1 94 μm 3 35 μm Olympus BX51 0 ~ 5 μm 93 86% Miki 4 RH μm 2 ipp6 0 Stokes 55SiCrA RH /mm /mm 2 ipp6 0 r i r j 5 N ij Fig SiCrA 3 The change of inclusions in 55SiCrA spring steels during RH refining process the average value for 3 heats a b c

3 1 /2 10 mm 6 mm 1 3 2 2 1 RH 55SiCrA 1 3 55SiCrA RH RH 1 94 μm 3 35 μm Olympus BX51 0 ~ 5 μm 93 86% Miki 4 RH 200 64 551 472 μm 2 ipp6 0 Stokes 55SiCrA RH 3 39 5

3 第 3 期王德永等 : RH 精炼过程钢中非金属夹杂物行为及演变规律 375 N ij = β r i r j n r i n r j 2 β r i r j n r i 10 μm n r j r i r j m SiCrA 2 RH Ca Al Mg Si O 10 μm S 2a 2e 2g 2h RH 2b 2c 2f 1b MnS RH 55SiCrA CaS 0 023% 0 057% 0 011% 52 17% RH 10 μm 6 ~ 10 μm 2g 3 min Fig SiCrA RH SEM SEM images of the inclusions in 55SiCrA spring steels during RH refining process a ~ b RH c ~ d 3 min e ~ g h ~ j 2 2 RH Q690D RH 1 72 μm 3 Q690D RH 1 9 μm RH 55 6 /mm / mm 2 Fig 3 3 Q690D RH 3 The change of inclusions in Q690D steels during RH refining process the average value for 3 heats a b c

SEM images of the inclusions in 55SiCrA spring steels during RH refining process a ~ b RH c ~ d 3 min e ~ g h ~ j 2 2 RH Q690D RH 1 72 μm 3 Q690D RH

4 376 东北大学学报 ( 自然科学版 ) 第 34 卷 RH 0 023% 4d 4g 2 ~ 3 μm 0 030% 0 015% D 34 78% 10 μm Al MgO 6 2 ~ 5 μm 18 70% 37 76% 2 Al + 4MgO slag /ref = MgAl 2 O 4 + 3Mg g % RH 4 Q690D Mg10-6 Fig 4 4 Q690D RH SEM SEM images of the inclusions in Q690D steels during RH refining process a ~ b RH c ~ f 5 min g ~ h i ~ j 4c 5a 4e 4f 4h 3 ~ 5 μm CaO - MgO - Al 2 O 3 FactSage RH 5b RH Fig 5 5 The formation mechanism of the dual-phase inclusion in this present work a b

inclusions in Q690D steels during RH refining process a ~ b RH c ~ f 5 min g ~ h i ~ j 4c 5a 4e 4f 4h 3 ~ 5 μm CaO -

5 第 3 期王德永等 : RH 精炼过程钢中非金属夹杂物行为及演变规律 RH 10 μm RH J Shu Zhi-hao 2 Si - Mn RH RH 9 Jo S K Kin S H Song B Thermodynamics on the formation of 1 RH spinel MgO Al 2 O 3 inclusion in liquid iron containing J Jin Da-zhong Dong Jin-sheng Lu Lian-fang et al Effect of RH treatment on low carbon Al-killed steel cleanliness J Iron and Steel RH-KTB RH J Zhang Chun-xia Liu Liu Du Ting A survey of RH vacuum refining process J Steelmaking Matsuno H Kikuchi Y Komatsu M et al Development of a new deoxidation technique for RH degassers J Iron and Steelmaker Miki Y Shimada Y Thomas B G Model of inclusion removal during RH degassing of steel J Iron and Steelmaker Cheng Shu-sen Zhao Jing-jing et al Inclusion coagulation and removal rate in molten steel J Journal of University of Science and Technology Beijing Itoh H Hino M Ban-ya S Deoxidation equilibrium of magnesium in liquid iron J Tetsu-to-Hagané Itoh H Hino M Ban-ya S Thermodynamics on the formation of spinel nonmetallic inclusion in liquid steel J Metallurgical and Materials Transactions B Itoh H Hino M Ban-ya S Thermodynamics on the formation of non-metallic inclusion of spinel MgOAl 2 O 3 in liquid steel J Tetsu-to-Hagané chromium J Metallurgical and Materials Transactions B Katsumori F Tetsuya N Mitsutaka H Activities of the constituents in spinel solid solution and free energies of formation of MgO MgO Al 2 O 3 J ISIJ International

1996 31 1 26-30 2 RH-KTB 1996 12 1 53-59 RH J Zhang Chun-xia Liu Liu Du Ting A survey of RH vacuum refining process J Steelmaking 1996 12 1 53-59 3 Matsuno H Kikuchi Y Komatsu M et al Development of

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374 东 北 大 学 学 报 ( 自 然 科 学 版 ) 第 34 卷 A A = A i 100 = PP i 100 A T PP T 1 1 A A % A i mm 2 A T mm 2 PP i 1 1 PP T 80 t 120 t RH 80 t 55SiCrA 120 t Q690

374 东北大学学报 ( 自然科学版 ) 第 34 卷 A A = A i 100 = PP i 100 A T PP T 1 1 A A % A i mm 2 A T mm 2 PP i 1 1 PP T 80 t 120 t RH 80 t 55SiCrA 120 t Q690