Steelmaking

Production practice of hot metal desulphurization in 300 t

REN Xun

2008, 24(01): 1-4. doi:

Asbtract ( 1866 )

Related Articles | Metrics

On the basis of production practicethe present paper introduces the basic principle of hot metal desulphurizating reaction by injection of granular passivating magnesium in the 300 t HM ladle and discusses the factors affecting the desulphurizing rate and desulphurization results by magnesium as well as various technological measures WISCO has adopted since this technological process is applied in the No.3 Steel-making plant for more than one year in order to prevent against possible resulphurization at the end point in refining steel grades by converter and the prominent results achieved.

Optimization and application of bottom blown process in 90 t

LAI Zhao-yi;XIE Zhi;ZHONG Liang-cai

2008, 24(01): 5-8. doi:

Asbtract ( 2042 )

Related Articles | Metrics

Physical modeling experiments have been carried out on the bottom tuyere configuration of the 90 t top-bottom combined blown converter at Sanming Iron & Steel Co., Ltd. Results of the production application show that the mixing time of the hot metal in the bath has been shortened by 28% by application of asymmetric configuration of the bottom tuyeres along the trunnion direction of the converter other than by the original symmetric configuration and in the meanwhile the technical indicators of the top-bottom combined blown converter refining have been greatly improved since optimization of the bottom tuyere configuration, for instance, the end point [O] has been reduced by 0.016%, end point [C]x[O] reduced by 0.0006, end point [Mn] increased by 0.029% and the T.Fe content in the end point slag reduced by 2.21% respectively on average.

Application of Bombing Detection Technology in Converter Steelmaking

YAN Hai-long;SONG Li-dan;ZHANG Wen-hua

2008, 24(01): 9-11,1. doi:

Asbtract ( 1434 )

Related Articles | Metrics

The present paper briefly describes the structure of equipments of the bombing detection system (TCO), the technological principle and application of the technology in the steelmaking and specially introducs the results of application of TCO in 40t converter in Jiangyin Huaxi Iron & Steel Co.，Ltd and points out that there is a bright prospect for popularization of this technology in China.

Continuous control of BOF by gas analysis

WU Liang;JIANG Zhou-hua;GONG Wei;ZHAO Guo-guang;ZUO Kang-lin

2008, 24(01): 12-15. doi:

Asbtract ( 1669 )

Related Articles | Metrics

Based on the data of gas acquired from the infrared analyzer and model calculation as well as on the material balance and thermal equilibrium in the bath of converter the present paper demonstrates the feasibility of prediction on the carbon content and temperature in continuous control of the converter by way of gas analysis and then reaches the conclusion that a higher hit rate can be achieved by gas analysis when the end point carbon content is less than 0.06% and is more suitable for refining low carbon steel. However since all data for predicting the temperature are acquired indirectly the hit rate of temperature prediction is inevitably lower by the gas analysis.

Improvement in RH productivity by optimization of production managerial mode

DONG Jin-gang;MA Zhi-gang

2008, 24(01): 16-18. doi:

Asbtract ( 2120 )

Related Articles | Metrics

RH has already become the key process in refining the high quality steels because of its powerful function. With the increase of hot metal quantity in the upstream processes and with an increased demand of high quality steels in the downstream processes the RH in the No.1 Steel-making Plant has already become the bottleneck affecting increase of the high quality steel productivity. Upon analysis of the factors affecting the RH productivity in No.1 Steel-making Plant the management optimization is carried out in the Plant including the principle of RH production schedule, RH steel allocation to the continuous casting machine, RH task division, reduction of RH treatment cycle, ingot steel production schedule and match of ingot steel and continuous casting steel. As the results the daily average productivity of RH treatment has increased 2.9 heats and the ratio of non-RH treated steels decreased accordingly.

Cause and solution to longitudinal edge crack in slab

TANG Sheng-bin

2008, 24(01): 19-21,3. doi:

Asbtract ( 1515 )

Related Articles | Metrics

The present paper carefully investigates and analyzes the causes to the longitudinal edge crack of slab and finds out that the primary cause is inappropriate distribution of the cooling water slits of the mould copper plates. By optimization of the cooling water slits of the mould copper plates and perfection of part of the processing parameters the longitudinal edge cracks have been effectively eliminated.

Cause analysis on and preventative measures for CC bloom breakout

CHEN Liang

2008, 24(01): 22-25. doi:

Asbtract ( 829 )

Related Articles | Metrics

The continuous casting bloom breakout accidents in Panzhihua Steel Works have been analyzed and the primary cause to the accidents determined. In order to control the breakout accidents the original operating processes in the plant have been optimized and other countermeasures put forward as well. As the results the breakout accidents in the Plant have been greatly reduced.

Process practice and analysis on free-cutting steel XY45

HU Xun-pu;YANG Qi-yun

2008, 24(01): 26-30. doi:

Asbtract ( 1842 )

Related Articles | Metrics

The present paper sums up the key factors in the technological processes such as the metallurgical process, continuous casting process and rolling process to ensure the product quality in production of the free-cutting steel XY45 and makes the theoretical analysis on those factors accordingly. Practice indicates that products in conformity with the specified standards can be finally produced so long as the [O] and [S] contents are well controlled and m(Mn)/m(S) is confined within the limit of 4.0 to 5.5 in the process of refining; and the processing parameters such as the overheating are strictly controlled and the quality of the slabs is well improved in the process of continuously casting; and the temperatures are well controlled in rolling.

Thermodynamic analysis on gasificating dephosphorization of converter slag by silicon reduction

WANG Shu-huan;WU Yan-qing;XU Zhi-rong;LV Xiao-fang;ZHANG xiang;WANG Chun-mei;LIU Tai-xin

2008, 24(01): 31-34. doi:

Asbtract ( 1848 )

Related Articles | Metrics

According to the ionic theory proceeding from the thermodynamic analysis of converter slag dephosphorization the final products in the gasification dephosphorization reaction have been calculated and determined, thus providing a theoretical basis for thermodynamic feasibility of gasification dephosphorization in the process of furnace protection by slag splashing. Results show that gasification dephosphorization in converter by slag reduction is feasible. Effects of such a few factors as temperature, basicity, FeO content and flowing nitrogen on the balance partial pressure are discussed.

Math model on solidification process of thin slab continuous casting and analysis of secondary cooling parameters

LI Wei-biao;LI Bao-kuan

2008, 24(01): 35-39. doi:

Asbtract ( 1849 )

Related Articles | Metrics

Since the cooling conditions required by the high quality thin-slab continuous casting process are extremely stringent a math model of solidification and heat transfer has been developed in a bid to study the thin-slab continuous casting process. The effects of various processing parameters on the solidification process with the mould and in the secondary zone have been quantitatively analyzed as well.

Effect of mould electromagnetic stirring on carbon segregation of medium carbon continuous casting bloom

LI Guo-zhong;CHEN Feng;CHEN Wei-qing;FENG Jun;HUI Rong

2008, 24(01): 40-43. doi:

Asbtract ( 1602 )

Related Articles | Metrics

Effect of M-EMS intensity on carbon segregation and micro-solidification structure has been studied on medium carbon bloom with a section of 180mm×180mm. Results show that with an increase of M-EMS current intensity in the mould the equiaxial crystal is increased and the secondary dendritic arm spacing and the central carbon segregation are decreased, yet the inter mediate carbon segregation in the bloom is increased. Therefore higher M-EMS current intensity is inappropriate for medium carbon bloom. It’s proved that intermediate carbon segregation in the medium carbon bloom is closely related to the occurrence of white band.

Evaluation on surface transverse cracking of continuous casting 15CrMo steel bloom

MIAO Xing-de;REN Yi-feng;ZHAO Han

2008, 24(01): 44-46,5. doi:

Asbtract ( 2084 )

Related Articles | Metrics

The longitudinal crack on the surface of the rolling stock of 15CrMo steel arises mostly from the transverse crack existing in the continuous casting bloom. The transverse crack in the continuous casting bloom often occurs along the intergranular boundary of the super large prior austenite grains (diameter of the grain ＞1 mm) as soon as the mould temperature arrives at 1 300℃. The intergranular crack of the continuous casting bloom has been analyzed by macro examination, metallographical observation and SEM analysis and the method for determination of the surface intergranular crack of the CC bloom is provided as well.

Numerical simulation of flowing field of axial symmetrical turbulence jet flow

LIU Kun;ZU Miao-yong;GAO Yin;WANG Ying-bin;BI Xiao-fu

2008, 24(01): 47-50. doi:

Asbtract ( 1805 )

Related Articles | Metrics

Numerical simulation of the jet flow field out of the Laval tube has been carried out by commercial software CFX4.4. Effects of different stagnant pressure and ambient temperature on the flow field on the central line of turbulence jet flow axis have been analyzed and discussed By comparison of the previous simulation results with the on-site operating curve of the oxygen lance the adaptability of k-εturbulence model in description of the turbulence jet flow field is verified.

Application of regenerative combustion technology in ladle burner

JIA Cheng;YIAN zhen-wu;LIN Yun-zhi

2008, 24(01): 51-53. doi:

Asbtract ( 1935 )

Related Articles | Metrics

The present paper introduces the working principle and effects of application of the regenerative ladle burner. In comparison of the technological properties of the burner before renovation with that after renovation the improvised burner is featured of such a few advantages as being capable to preheat air (gas) to over 1 000 ℃, reduction of gas consumption by about 40%, acceleration of the burning speed 0f about 15 min, homogeneous temperatures distribution in the inner lining of ladle and low discharge of CO and NOx gases.

Revamp of equipments and optimization of process for high speed slab continuous caster

WANG Hong-feng

2008, 24(01): 54-57,6. doi:

Asbtract ( 2153 )

Related Articles | Metrics

The present paper introduces the technological processes and revamp of equipments of the No.2 High Drawing Speed Continuous Caster in Meishan Steel Co., including mould cooling technology, properties of mould flux, mould oscillation parameters, installation parameters of the foot roller of the mould, optimization of the secondary cooling process and caster gap as well as improvement of the Hydraulic Pressure Station of the Continuous caster and briefly describes the achievements obtained in the practical production.

Selection of hot metal pretreatment mode for new steel-making plant

ZHANG Long-qiang;TIAN Nai-yuan;XU An-jun

2008, 24(01): 58-62. doi:

Asbtract ( 1779 )

Related Articles | Metrics

The optimal order of the hot metal pretreatment achieved by thermodynamic calculation and comparison of different flux and pretreatment methods is hot metal desulphurization-desiliconizaton and dephosphorization. The pretreatment containers determined by comparison of the thermodynamic conditions for different flux and different pretreatment methods are as follows: ladle for desulphurization by KR and converter for desiliconization and dephosphorization exclusively. It’s concluded by comparison analysis of the operation cost for hot metal pretreatment that special converter be selected to carry out dssiliconization and dephosphorization simultaneously and for the purpose of desulphurization KR method (CaO used as the desulphurizer) be adopted. The optimal hot metal pretreatment mode for the newly built steel-making plant is determined to be hot metal desulphurization in ladle by KR method (CaO as desulphurizer) and desiliconization and dephosphorization in converter.

Table of Content