钢铁钒钛

MATHEMATICAL MODEL ON BOF'S LINING LIFE OF PANGANG

Tang Tianyu, Du Dexin, Liu Xiaocheng, Xu Weihua, Li Zhi

1995, 16(2): 1-8.

Abstract(26) PDF(0)

Abstract:
This study applies statistics,mathematical correlation analysis and cybernetics to parameters control and data processing in BOF steelmaking process. The mathematical analysis is combined with steelmaking theory,so as to obtain the equivalent relation between process parameters,lining materials and lining life,and establish mathematical model of Pangang's BOF lining life. The model has been used to control factors affecting lining life,resulting in an annual increase of 10%in Pangang's BOF lining life during the recent four years and marked improvement in BOF productivity.

STUDY AND APPLICATIONS OF ABRASION RESISTANT LINING PLATE──USED IN THE FEEDING, CONVEYING AND MIXING SYSTEM FOR BF

Qing Shangsheng, Chen Jingju, Luo Chuanyue, Liu Shufang

1995, 16(2): 9-15.

Abstract(14) PDF(0)

Abstract:
This paper investigates the characteristics of KmTBCr25Ni2MoV high chromium cast iron which is produced as cast,air quenching and as cast fast cooling,and the effects of carbon content on its abrasion resistance and mechanical properties.By using as cast fast cooling technology and improving the frame of lining plates,the life of lining plates is 4 to 6 times longer than ZGMn13 and steel containing manganese element.This material is one of the best materials used under impact abrasive conditions.

STUDY ON PREPARATION OF HIGH PURITY TiO₂ HYDROLYSIS OF TITANIUM ALKOXIDES

Hu Hongfei, Zhang Ronglu, Li Dacheng, Zhou Dali

1995, 16(2): 16-21,29.

Abstract(35) PDF(0)

Abstract:
The synthesis method of titanium alkoxides has been introduced.In inert solvent,the process of preparation of TiO₂ particles by hydrolysis of self-made titanium alkoxides is described.The effects of the concentration of reactants,the temperature, amount of water,the stirring rate,dispersants,the drying and the burning on particle properties were studied.The TiO₂ powder has been prepared,whose purity is above 99.5 percent,particle size is below 1.0μm and form is similar to ball. This type of TiO₂ powder has been made into PTC electronic componments,with performance up to the technic indices of TDK produced in Japan.

EXPERIMENTAL STUDY ON 45CrMnMo STEEL FOR OIL DRILL COLLAR

Qian Yonglan

1995, 16(2): 22-29.

Abstract(21) PDF(0)

Abstract:
In this paper,the effects of chemical composition of the steel for oil drill collar on its properties were studied and the heat treatment process were optimized.The results show that the 45CrMnMo steel,with high hardenability and excellent combined mechanical properties,is an ideal material for making large-size(8"~9")oil drill collar.

A PROJECT OF PANGANG'S BOF STEELMAKING PROCESS COMPUTER CONTROL SYSTEM

Yang Shubo, Du Dexin, Ji Kebin, Li Zhizheng, Tu Xuyan, Zhang Guolin, Liu Cheng'an

1995, 16(2): 30-35,46.

Abstract(29) PDF(0)

Abstract:
By overviewing the recent worldwide development of the Cornputer Control System Structure(CCSS)in BOF steelmaking process and its prospect,and considering the reality of BOF steelmaking process in Pangang,it is concluded that an artificial intellectualizing,accumulizing and multiplizing control system should be adopted in the general project,and the system structure should be a Hierarchical Distributed Cornputer Control system(HDCCS)so that a best feature of the system and a high rate of performance to price can be obtained.The suggestive steps of the project put into action are also discussed in this paper.

A MATHEMATICAL MODEL OF HEAT TRANSFER OF THE SPRAY COOLING MOLD OF CASTER

Xue Nianfu, Wang Yuanzai, Zhou Junqing

1995, 16(2): 36-40.

Abstract(29) PDF(0)

Abstract:
Based on an understanding of the solidification features of slabs in moulds,the mathematical model of heat transfer of the spray cooling mold has been proposed.The metallurgical parameters of the conventional recirculating water cooling and the spray cooling molds have been calculated respectively.The metallurgical effects of both cooling methods have been studied and compared.

EXPERIMENTAL STUDY ON PERFORMANCE OF CYCLONIC DISTRIBUTORS USED FOR BF COAL INJECTION

Yang Shaoli, Shen Yishen

1995, 16(2): 41-46.

Abstract(14) PDF(0)

Abstract:
Laboratory-scale experimental investigations on characteristics of the three types of cyclonic distributors(Long-column, Short-column and ball types)developed were performed.The experimental results show that solids through long-column type distributor is most even-distributed;its distribution deviation is below 5% as gas flowrate is greater than 60m³/h;distribution deviation decreases with increase of gas flowrate and appropriate increase of column height.

THE EFFECT OF TITANIUM ON VANADIUM REDUCTION IN SMELTING REDUCTION SLAG OF THE SYSTEM CaO-SiO₂-Al₂O₃-Mgo-TiO₂-V₂O₅

Feng Keqing

1995, 16(2): 47-50,55.

Abstract(29) PDF(1)

Abstract:
By simulating the smelting reduction process,experiments were conducted to study the coupled reaction between V-Ti in the CaO-SiO₂-Al₂O₃-MgO-TiO₂-V₂O₅ slag and carbon saturated iron melts.And the effect of titanium on vanadium reduction in various laboratory conditions was investigated.

SLAG OXIDE-METAL ELEMENTS EQUILIBRIUM AND REACTIONS IN THE PRODUCTION OF FERROSILICO-TITANIUM

Yang Baoxiang

1995, 16(2): 51-55.

Abstract(18) PDF(0)

Abstract:
The paper describes the reactions and the slag oxide-metal element equilibrium between the slag system TiO₂-CaO-MgO-SiO₂-Al₂O₃and alloy system Ti-Si-Fe. The Pangang blast furnace TiO₂ slag,ferrosilicon and lime were mixed and fed into 200kVA DC electric furnace. Reaction occured in the state of molten mixture. Ferrosilico-titanium and lower reduced TiO₂ slag were obtained.Equilibrium was attained after 40mins.The basicity of the slag can be increased by moderate addition of lime. The higher Si content in the alloy favours good recovery of Ti from TiO₂ slag.

DECOMPOSITION KINETICS OF APV

Xu Tao

1995, 16(2): 56-59.

Abstract(22) PDF(0)

Abstract:
This paper describes the decomposition process of APV under nitrogen and oxidizing atmosphere by making use of the latest thermal ananlysis technology. By means of calculation of its thermal dynamics and kinetics,the decompsition heat,activation energy and reaction order under different atmosphere have been determined,and the Arrhenius equation diagram of different decomposition process has been given.

PRODUCTION, DEMAND, SUPPLY AND PRICE OF REINFORCED BAR IN THE INTERNATIONAL MARKET

Shan Lingtian

1995, 16(2): 60-69.

Abstract(21) PDF(0)

Abstract:
The production of micro-alloved and hot-rolled,residual heat treated and cold-rolled reinforced steel bars by foreign Steelmakers is surveyed.A comparison is made between the three grades in terms of their advantages and disadvantages as well as their application fields.
Owing to the economic recovery currently occuring in the major industrialized nations,the demand of international reinforced bars is booming and the price is upping,which gives domestic suppliers great opportunities of promoting exports.The V-bearing 3^# grade steel bar is an idea type of reinforced bar,which will gradually substitute the 2^# grade in the domestic market and can adapt to the international construction market.

1995 Vol. 16, No. 2