钢铁钒钛

LIMIT OF INJECTED COAL RATE UNDER OXYGEN-RICH HIGH PCI RATE AT PANGANG 4^#BF

ZHU Zizong, ZHANG Yuhuai, XU Chushao

1998, 19(4): 1-5.

Abstract(22) PDF(0)

Abstract:
Based on the mathematical model of pulverized coal combustion in raceway under oxygen-rich high PCI rate at Pangang 4^#BF, when coke rate and blast temperature are 580kg/tFe and 1050℃ respectively. if injected coal rate exceeds 155kg/tFe, blast oxygen-rich rate should be over 2%, blast furnace operate smoothly. When injected coal rate exceeds 210kg/tFe, even if blast oxygen-rich rate reaches 10%, because a large amount of pulverized coal is not combusted, blast furnace can’t operate smoothly.

EFFECT OF COMBINED MICROALLOYING ON MECHANICAL PROPERTIES OF SiMn3 TYPE BAINITIC STEEL

WU Haidong, XU Qikun

1998, 19(4): 6-9.

Abstract(17) PDF(0)

Abstract:
The effect of combined microalloying using a little Mo and microalloying element V, B,Re has been investigated on the mechanical properties of low carbon high strength SiMn3 type bainitic steel. The results show that combined microalloying can remarkably improve the mechanical properties of the steel, such as as-air cooled toughness, low temperature toughness, temper resistance and strength after high temperature tempering.

EFFECT OF REDUCTION OF VANADIUM AND TITANIUM OXIDES ON TEMPERATURE OF SLAG AND HOT METAL IN BF

DIAO Risheng

1998, 19(4): 10-13.

Abstract(21) PDF(0)

Abstract:
There are reductions of a part of vanadium and titanium oxides on interface between slag and hot metal during V-Ti-bearing magnetite smelting in BF. These reactions result in difference of chemical composition and temperature between slag and roughing slag. The measurement and analysis results of temperature and composition of slag,roughing slag and hot metal show that reduction reactions on slag-hot metal interface make it possible that Ti （C, N ） content is about 0.2%~0.3% more and TiO+Ti₂O₃ content is about 0.3%~0. 4% more in roughing slag than that in slag,and the temperature of slag is about 25℃ higher than that of roughing slag,temperature of hot metal is about 5-6℃ higher than that of roughing slag. It is a particular phenomenon of V-Ti-bearing magnetite smelting in BF.

EFFECT OF H₂S ON CORROSION BEHAVIOR OF LOW CARBON STEEL IN COKE OVEN GAS

HUANG Xu, CHEN Jie, YAO Yongguo, DONG Jun, HE Qiping, LEI Xiuhua

1998, 19(4): 14-20.

Abstract(22) PDF(0)

Abstract:
The effect of H₂ on the corrosion dynamics of low carbon steel in coke oven gas was investigated. It is showed that the electropolar process controlling step changes remarkably at 0.15g/m³ H₂,corrosion controlling step is cathodic reactions at<0.15g/m³ H₂ and anodic reactions at>0.15g/m³H₂.There is evidence that the dense protective film forms on the surface of low carbon steel in high H₂ coke oven gas. The phenomena are theoretically explained.

SLAG SPLASHING PRACTICE IN SEMI-STEEL STEELMAKING AT PANGANG

YANG Subo, WEN Yongcai, XU Lizhi, DONG Luren, CHEN Weiqing, YUAN Hui

1998, 19(4): 21-25.

Abstract(20) PDF(0)

Abstract:
The slag splashing practice has been used successfully to extend BOF lining life at Panzhihua Iron and steel Co. The effects of vanadium and titanium oxides on the melting point, viscosity of the slag and the saturation solubility of MgO in the slag were investigated. The proposals for slag system paramers used for slag splashing practice were put forward.

EFFECTS OF HOT-ROLLNG TECHNICAL PARAMETERS ON PHASE TRANSITION POINTS OF 08Al STEEL

ZHU Tao, ZHANG Kaijian, YI Lijun, LIU Yazheng

1998, 19(4): 26-30.

Abstract(18) PDF(1)

Abstract:
The effects of heating temperature, reduction, deformation temperature and cooling rate on phase transition point Ar₃ and Ar₁ of 08Al steel were investigated through Gleebe heat-simulation test.The optimal temperature scheme for continuous hot rolling of 08Al steel was obtained.The results show that the heating temperature should be controlled in the range of 1200~1250℃,provided that heating quality is ensured. It is reasonable to control the finishing rolling temperature around 900℃ and the cooling rate after rolling about 30℃ /s.

APPLICATION OF LASER QUENCHING TECHNOLOGY TO ROUGHING ROLL OF WIRE ROD MILL AT PANGANG

LIN Jiandong, ZHENG Huijun, LI Dadong, QIU Jiyue, CAI Qiang, TANG Min

1998, 19(4): 31-35.

Abstract(21) PDF(0)

Abstract:
Based on the results of laboratory experiment,the technical parameters of laser quenching process were selected. The roughing roll of Wire Rod Mill at Pangang was laser quenched. The good service results were achieved using laser quenched roughing roll in practical production.

OPTIMIZATION OF BURDEN CONSTITUENTS FOR ROASTING VANADIUM SLAG PRODUCED IN CONVERTER IN MULTI-HEARTH ROASTER

PENG Mingfu, ZHU Shengyou, CENG Zhiyong, DENG Xiaobo, TANG Hongguo

1998, 19(4): 36-40.

Abstract(21) PDF(0)

Abstract:
Because the burden constituents is not rational in roasting vanadium slag produced in converter in multi-hearth roaster, there are problems such as rake adhering and material adhesion.Therefore, the optimization of burden constituents was conducted, making it smooth to roast the vanadium slag in multi-hearth roaster at≤800℃. which is benefit to improve recovery of vanadium in the slag roasted.

V₂O₅ PRODUCTION PROCESS FROM VANADIUM SLAG SMELTED IN PANGANG CONVERTER

WANG Jinchao, CHEN Housheng, LI Guisheng, XIE Qianlin, DENG Xiaobo

1998, 19(4): 41-46.

Abstract(25) PDF(0)

Abstract:
The physicochemical properties of vanadium slag produced in pangang converter was analyzed.The effects of technical paramters of roasting. leaching and settling processes were investigated on the recorery of vanadium in the slag. The proposals were put forward for the optimization of V₂O₅ production process.

STUDY OF TECHNOLOGY FOR ROASTING VANADIUM SLAG PRODUCED IN CONVERTER IN MULTI-HEARTH ROASTER

CHANG Zhifeng, ZHU Shengyou, MU Hongbo, PENG Mingfu, LI Guisheng, XIE Qianlin, DENG Xiaobo

1998, 19(4): 47-51.

Abstract(14) PDF(0)

Abstract:
The physicochemical analysis was conducted of the vanadium slag produced in converter.A series of laboratory experiments were carried out according to the characteristics of the slag and multi-hearth roaster. Based on the experimental results,the roasting process in multi-hearth roaster was improved. The recovery of vanadium in the slag roasted in multi-hearth roaster reaches 86.6%. The total vanadium in the residual slag after leaching decreases to about 1.2%.

REVIEW THE HISTORY OF V-Ti-BEARING MAGNETITE SMELTING IN BLAST FURNACE AT CHONGQING IRON AND STEEL CO.

WEN Guangyuan

1998, 19(4): 52-57.

Abstract(26) PDF(0)

Abstract:
The history of V-Ti-bearing magnetite smelting in blast furnace at Chongqing Iron ＆ steel Co. was briefly introduced.The smelting condition,technical and economical index,and operation regulations in the main Periods of V-Ti-bearing magnetite smelting in blast furnace were emphatically discussed.

NEW DEVELOPMENT OF RECOVERY OF VANADIUM AND TITANIUM FROM V-Ti-BEARING MAGNETITE AT PANGANG

XI Gan, HU Kejun

1998, 19(4): 58-64.

Abstract(16) PDF(0)

Abstract:
The production process,capacity and product quality of main vanadium and titanium products, such as vanadium slag,vanadium pentoaide, ferrovanadium, titanium concentrate and titanium white （titania）produced at Pangang,are introduced in this paper. The new technologies for the existing process and the latest development on the recovery of vanadium and titanium are presented in detail. The future trend on vanadium and titanium development at Pangang is also predicted.

EFFECT OF MICROSTRUCTURE ON FRACTURE MORPHOLOGY IN RAIL STEEL

WU Zhaoquan

1998, 19(4): 65-68.

Abstract(26) PDF(0)

Abstract:
The microstructure and fracture morphology of directly etched fracture sample of rail steel were observed. The relatinos between the microstructure and fracture morphology were discussed.

1998 Vol. 19, No. 4