钢铁钒钛

THE FUNCTION OF V₂O₅ IN Ti-CONTAINING SLAG OF BLAST FURNACE TYPE TO INHIBIT TiO₂ REDUCTION

Du Hegui, Zhang Ziping

1994, 15(4): 1-3,27.

Abstract(69) PDF(3)

Abstract:
The experimental study suggests that the TiO₂ reduction can be inhibited by the vanadium oxide present in the Ti containing slag. However, the reduction can't be effectively inhibited unless the content of V₂O₅ exceeds 2%. As the reduction temperature increase,the migration reaction between V,Ti and Si can be remarkably promoted.

METALLURGICAL CHARACTERISTICS AND ITS EFFECT OF 120t TOP AND BOTTOM-BLOWN CONVERTER AT PANZHIHUA IRON AND STEEL CO.

Gu Longjian

1994, 15(4): 4-9.

Abstract(48) PDF(3)

Abstract:
The metallurgical characteristics and its effect of the 120-ton top and bottom-blown converter with multihole permeable elements laid on the spherical-bottom refractory at Panzhihua Iron & Steel Co. are described.The factors affecting metallurgical characteristics such as the number and the arrangement of the permeable element as well as the bottom-blown pattern are discussed.

THE EFFECT OF THE PC INJECTION WITH HIGH OXYGEN ENRICHMENT ON THE IRONMAKING USING TOTAL VANADIUM-BEARING TITANNFEROUS MAGNETITE IN BF

Zhu Yongping, Qi Baoming

1994, 15(4): 10-14.

Abstract(42) PDF(1)

Abstract:
The difficulty of the smelting of vanadium-bearing titaniferous magnetite in BF is that the high-titanium slag is easy to be viscous. It will result in hot metal easy to stick to the ladle,poor desulphurization and much iron loss.The reason is that titanium dioxide is overreduced to TiC TiN,which couldn't melt unless under high temperature. An experimental study on the PC injection with high oxygen enrichment has been carried out to search for a new way of ironmaking using total vanadium-bearing titaniferous magnetite in BF.

TRIAL PRODUCTION OF 22MnTiBREE GEAR STEEL BY LARGE CONVERTERS

jin Liandi

1994, 15(4): 15-20.

Abstract(64) PDF(1)

Abstract:
The 22MnTiBRE gear steel produced by large converters and its associated production process and material properties are briefly introduced in this paper. The steel liquld is purified through an addition of 200kg/heat calcium deoxidizer to the ladle before tapping and feeding of aluminium wire and complex packed wire containing Ca,Ba,RE,Si,C and F after tapping.Besides,the method of hanging the RE rod and bright agent is adopted consequently,problems involved in the production of this steel by large converter have been solved,resulting in lower oxygen content in the steel liquid more consistent composition of steel liquid and large ingot,less finishing work and improved upsetting property of the steel. And gear steel with small variation in hardenability,fine grain and good cleaniness has been produced.

LABORATORY STUDY ON ADDING ORGANIC ADHESIVES TO SINTERING MIX IN PANZHIHUA IRON AND STEEL

Li Jianming, Shu Wendong, YU Wenhua

1994, 15(4): 21-27.

Abstract(46) PDF(2)

Abstract:
During the original stage of the study,twenty four kinds of organic adhesives are used as adding agents of sintering mix for granulation. The PG2 has been chosen out of them according to the results from sinter pot test.It can improve notably the permeability of sintering mix and raise productivity. But it doesn't pollute sinter.

COLD-STATE EXPERIMENT OF THE SPEAYCOOLING MOLD OF CASTER

Xue Nianfu, Zhou Junqing

1994, 15(4): 28-31.

Abstract(43) PDF(1)

Abstract:
A cold-state experimental device of the billet caster spraycooling mold is designed to study the behaviour of its mist jet.Based on the investigation of the nozzles' water characteristic parameters,such as water flow distribution, spray angle and water drop velocity,the nozzles arrangement in the mold and rational water flow distribution profiles are obtained.

THE BEHAVIOR OF Ti REDUCTION IN SMELTING REDUCTION SLAG OF THE SYSTEM CaO-Sio₂-Al₂O₃-MgO-TiO₂

Feng Keqin, Zhang Binghuai

1994, 15(4): 32-37,49.

Abstract(65) PDF(5)

Abstract:
Experiments have been conducted to study the behavior of titanium reduction between the CaO-SiO₂-Al₂O₃-MgO-TiO₂ slag and carbon saturated iron melts in the smelting reduction process. The influences of TiO₂-content in the slag,slag basicity(CaO/SiO₂),reduction temperature and quantity of iron bath on the titanium reduction have also been investigated.

A BRIEF DISCUSSION ON THE QUALITY FAILURES IN THE PRODUCTION OF HIGH CARBON MICROVANADIUM PD₃ STEEL RAIL

Wang Qingtai

1994, 15(4): 38-44.

Abstract(49) PDF(1)

Abstract:
To solve the problems of the rail fracture during straightening,bloom fracture and over-firing that occured at the beginning of commercial production of high carbon microvanadium PD₃ steel rail recently developed by Pangang,macroscopic observation and metallographic study are used to analyze the main mechanisms for the material failure. An investigation is made into the production technology,and measures have been accordingly presented to improve the existing production technology.

DEVELOPMENT AND APPLICATION OF SYNTHETIC POWDER FOR INGOT CASTING AT PANZHIHUA IRON AND STEEL CO.

Sun Wenming, Liu Nanping

1994, 15(4): 45-49.

Abstract(45) PDF(1)

Abstract:
The existing botton pouring technology,which involves application of mould powder,insulating plate and flux to prevent shrinkage has the disadvantage of high cost,complex operation and environmental pollution. In order to solve these problems,we have developed a synthetic powder for ingot casting.Industrial application suggests that the synthetic mould powder has the advantage of simple operation,safety and reliability,reducing environmental pollution and cost.

STUDY ON RATIONAL COMBUSTION PRACTICE OF HOT STOVES ON N0.4 BF AT PANZHIHUA IRON AND STEEL CO

Huang Youyou

1994, 15(4): 50-55,60.

Abstract(46) PDF(1)

Abstract:
The high temperature practice of the external combustion hot stoves on the new BF at PZH I & S Co. can be realized on the basis of rational combustion schedule,option of optimum combustion parameters, improvement of combustion operation and automatized combustion control.It is coucluded by our research that it's rational to adopt rapid combustion schedule with a ratio of air to fuel 0. 70~0.77,fixed gas flow and adjusted combustion airflow. The combustion process can be successfully controled and a safe,stable and rapid combustion can be realized by means of automatized adjustion of the pressure of BF clean gas mains and automatized closed combustion control depending on five operating varibles:dome temperature,flue gas temperature,ration of air to fuel,residual oxygen of flue gas and BF gas flow. Blast temperature as high as 1100℃ can be obtained and the service life of hot stoves is expected to be extended.

APPLICATION OF IGNITER WITH MULTIPLE SLIT BURNER IN THE SINTERING PRODUCTION OF PANZHIHUA IRON AND STEEL CO.

Zeng Yongfu

1994, 15(4): 56-60.

Abstract(53) PDF(1)

Abstract:
The igniter with multiple slit burner is characterized by its higher combustion efficiency,better adjustment of flame length,more rational temperature distribution in the furnace hearth.The results of plant test have indicated that the igniter is able to satisfy the sintering ignition requirements at Panzhihua Iron & Steel Co.,and result in significant energy saving efficiency.

TEST ON MAINTAINING TEMPERATURE OF THE SKIMMER OF BF AT PANZHIHUA IRON AND STEEL CO.

Li Zbencai

1994, 15(4): 61-66.

Abstract(49) PDF(1)

Abstract:
Reasons of the skimmer damage when smelting V-bearing titanomagnetite at Panzhihua Iron and Steel Group are studied.The new type of refractory for the skimmer and dam lining is made and tested.In order to meet the requirements of maintaining temperature of the skimmer the technique of repairing and building the skimmer is improved.At last,the new operation technique of maintaining temperature of the skirmmer succeeded.

1994 Vol. 15, No. 4