钢铁钒钛

THE INFLUENCE OF VANADIUM ON THERMOPLASTICITY OF STEEL AT TEMPERATURES RANGING FROM 700 TO 1200℃

XIAO Feng, XU Chushao, WU Bing, ZHAO Kewen, ZHAO Rongjie

1998, 19(3): 1-6,19.

Abstract(26) PDF(0)

Abstract:
Thermoplasticity of vanadium steel and vanadium-free steel was measured on GLEEBLE-1500 thermal-mechanical simulator. The morphology of vanadium in steel under different conditions at temperatures ranging from 700 to 1200℃ and its influence on thermoplasticlty of steel were studied.

STUDY OF MANGANESE ORE DIRECT ALLOYING FOR INCREASING [Mn] CONTENT IN STEEL IN STEELMAKING PROCESS

WEN Yongcai, DONG Yanhua, WANG Tao, DU Dexin, WANG Jian

1998, 19(3): 7-13.

Abstract(19) PDF(0)

Abstract:
The experiment of manganese ore direct alloying for. increasing [Mn] content in steel was carried out. The factors influencing on [Mn] content in steel and manganese yield were studied. The results show that [Mn] content in steel and manganese yield can be increased by decreasing （TFe） of slag,controlling basicity of slag in the range of 2~4 and increasing [C] content and temperature in steel. The reducing ability of SiC for reduction of （MnO） in slag is superior to that of coke. Manganese ore direct alloying technique can indirectly improve desulphurizing ability of slag

INDUSTRIAL TEST ON CENTRAL COKE CHARGING TECHNOLOGY APPLIED ON THE BELLESS TOP BLAST FURNACE AT PANGANG

FU Weiguo, FAN Yundong

1998, 19(3): 14-19.

Abstract(29) PDF(0)

Abstract:
This paper represents the industrial test on central coke charging practised on the No. 4 BF at Panzhihua Iron and Steel Corp. The gas flow change and temperature distribution is investigated and the blast furnace performance following central coke charging is described.

STUDY ON "PU-1" HIGH STRENGTH LOW ALLOYED H₂S STRESS CORROSION RESISTANCE DRILLING STEEL

PU Haishan

1998, 19(3): 20-25.

Abstract(23) PDF(0)

Abstract:
The newly developed "PU-1" high strength low alloyed H₂S stress corrosion resistance drilling steel exhibits excellent combined mechnical property,particularly H₂S stress corrosion reststance and welding properties. Used for structural elements,it can bring about remarkable economic and social benefits.

DEVELOPMENT OF PD₂75kg/m FULL-LENGTH HEAT TREATED STEEL RAIL

DENG Jianhui, LEI Xiuhua, ZHANG Kunwu

1998, 19(3): 26-29,40.

Abstract(25) PDF(0)

Abstract:
The high carbon low manganese hot rolled steel rail is subject to heat treatment,using double frequency induction heating and slack quenching with compressed air. The PD₂75kg/m heat treated rail was developed which is characterized by fine pearlitic structure;a depth of hardened layer ≥ 15mm and mechanical property:σ_0.22815~980MPa, σ_b1185~1340MPa, δ₅10%~15%, room temperature impact toughness aK 14~33J/cm², average fracture toughness K_Ic 45.5MPa·m^1/2. The newly developed rail has a fair combined property of high strength,good ductility and toughness,and excellent service performance with its service life over twice that of the U71Mn hot rolled rail.

EXPERIMENTAL STUDY ON UP-GRADING PRIMARY SULPHUR-COBALT CONCENTRATE

ZHOU Jun, DAI Xiangdong

1998, 19(3): 30-33.

Abstract(14) PDF(0)

Abstract:
An Investigation was made into the morphology of sulphur and cobalt in the primary sulphur-cobalt concentrate. indicating that it is possible to improve the grade of sulphur-cobalt concentrate with floating process. And the laboratory tests with floating process and open circuit process were carried out. The open circuit test suggests that with twice cleaning and once scavenging process,concentrate containing sulphur of 37.43 % and cobalt of 0.291 % can be obtained and recovery of 77.60% and 87.04% can be respectively achieved’ As a result,"Three times of cleaning and once scavenging" process is recommended for industrial test.

A LABORATORY STUDY ON INJECTION OF COAL BLEND IN BLAST FURNACE

LIU Jianming, JIANG Sheng, RAO Jiating, YU Fucheng, DENG Jun

1998, 19(3): 34-40.

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Abstract:
The authors have studied the fire point,explosion properties and combustion characteristics of coal blend which contains anthracite with 20%~50% semi-bituminous coal. The results show safely Injection of the coal blend under the existing condition of Pangang blast furnace coal injection system can be realized. It is beneficial to improvement of coal grinding efficiency and combustion properties of pulverized coal; therefore,resulting in the Increase of coal injection rate and decrease of cost of coal injection.

EFFECTS OF DESULPHURIZING AGENTS AND TECHNICAL CONDITIONS ON EXTERNAL DESULPHURIZATION OF HOT METAL CONTAINING VANADIUM AND TITANIUM

WEN Guangyuan

1998, 19(3): 41-46,50.

Abstract(26) PDF(0)

Abstract:
The laboratory experiments of external desulphurization of hot metal containing vanadium and titanium with injection method were carried out. The desulphurizing rate, desulphurizer consumption and temperature drop of the hot metal using the lime,calcium carbide and magnesium-base composite desulphurizers as well as the influence of technological conditions on the desulphurization were analysed.

MEASUREMENT OF HOT STATE CHARACTERISTICS OF SECONDARY COOLING NOZZLES OF PANGANG SLAB CONTINUOUS CASTER

WEN Guanghua, WANG Shuibo, ZHAO Kewen

1998, 19(3): 47-50.

Abstract(23) PDF(0)

Abstract:
The hot state chalacteristics of the secondary cooling nozzles used for Pangang slab Continuous Caster were systematically measured with heat transfer coefficient measurement apparatus. The relations between heat transfer coefficient and surface temperature of strand under different water flow rate and air flow rate were obtained. The research results provide a basis for selecting nozzles and optimizing secondary cooling system.

EFFECTS OF Si AND Ti CONTENTS IN V-BEARING HOT METAL ON IRONMAKING AND STEELMAKING PROCESS INDICES

MENG Xianheng, ZHENG Hang, ZHAO Che

1998, 19(3): 51-53,58.

Abstract(29) PDF(0)

Abstract:
Based on data from production practices,an investigation was made into the effects of Si ＋Ti contents in hot metal on ironmaking indices including coke ratio,productivity and S content in pig iron,and vanadium recovery,grade of vanadium slag in vanadium recovery from hot metal and lime consumption in steelmaking. Optimum contents of Si ＋Ti in hot metal is accordingly proposed.

CONTROL OF [Si] AND [Al_s] CONTENTS IN LOW CARBON Al-KILLED STEEL PRODUCED AT PANGANG

LI Jun, CHENG Xingde, YANG Jincheng, FENG Yan

1998, 19(3): 54-58.

Abstract(29) PDF(0)

Abstract:
The semi-steel steelmaking in convert at pangang results in high oxygen activity and its large fluctuation in molten steel in end point of blowing. Therefore,predeoxidation with special deoxidizer and Al wire feeding in twice are adopted. The problem of [Si]content exceeding standard and low hitting percent of [Al_s]content are solved.

A MATHEMATICAL MODEL FOR ESTIMATING GAS FLOW DISTRIBUTION IN THE BLAST FURNACE THROAT

ZHONG Yong

1998, 19(3): 59-64.

Abstract(31) PDF(0)

Abstract:
The mathematical model has been developed for the estimation of the gas flow distribution in the blast furnace throat based on the back-propagation algorithm of artificial neural network. The mathematical model on-line runs on VAX computer for the No. 4 blast furnace at Pangang,and continuously estimates the gas flow distribution in the blast furnace throat. The hitting percent for the model to estimate the gas flow distribution reaches 82%,which shows high performance in guiding blast furnace operation.

1998 Vol. 19, No. 3