钢铁钒钛

INVESTIGATION ON SURFACE LONGITUDINAL CRACK OF CONTINUOUS CAST SLAB OF SUBPERITECTIC STEEL

Wen Guanghua, Chi Jinghao, Wang Qian, Wang Yu, Li Gang, He Yuming, Fu Bin, Chen Wenman, Zhu Bin

1999, 20(3): 1-5.

Abstract(18) PDF(2)

Abstract:
Based on practical situation of continuous casting operation at No.7 Plant of Chongqing Iron and Steel Corp., the effects of molten steel quality, mold level, mold powders and equipment maintenance etc.on surface quality of slab were investigated through field test. The type, amount and distribution of surface defects of slab were analyzed.The measures for controlling surface quality of slab were put forward.

PRODUCTION TECHNOLOGY FOR RARE EARTH TREATED STEEL AT PANGANG

Jia Liandi, Gu Jin

1999, 20(3): 6-10.

Abstract(17) PDF(1)

Abstract:
The technology for rare earth treatment of molten steel was developed. The molten steel is deoxidized and desulphurized using alcalin-earth metals(Ca, Ba, Mg) before rare earth adding into molten steel, then the combined cored wire containing rare earth is fed into molten steel so as to produce alloy structural steel and spring steel.After treatments above, the rare earth cored wire is fed into mold when the quality steels such as line pipe, automobile frame steel plate and weather-resistant steel etc.are made.The total oxygen content of the quality steel is ≤ 20ppm, they have good mechanical properties.

DETERMINATION OF SPRAY NOZZLE CHARACTERISTICS IN SECONDARY COOLING ZONE OF PANGANG SLAB CONTINUOUS CASTER

Chen Yong, Wu Bing, Chen Yu, Yan Xuemo, Wang Huaibin

1999, 20(3): 11-14.

Abstract(18) PDF(1)

Abstract:
The cold state characteristics of spray nozzles in secondary cooling zone of slab continuous caster were investigated.The relation between pressure and water flow rate, distribution of spray water flux, and distribution of spray angle and water droplet diameter were measured under different spray water conditions.The characteristic curves of spray nozzles made at home and abroad were analyzed.The more rational parameters are provided for domestic plants to produce spray nozzle.

IMPROVEMENT OF MOLD OSCILLATING SYSTEM FOR PANGANG SLAB CONTINUOUS CASTER

Zhao Xianjue, Zhao Daiqiong, Huang Yuanmei, Li Yingxing

1999, 20(3): 15-18.

Abstract(13) PDF(2)

Abstract:
The Stability and reliability of the mold oscillating system for Pangang 1350 slab continuous caster were analyzed Based on existing problems, the mold oscillating system was improved ensuring high casting speed.

STATE-OF-ART OF SECONDARY COOLING FOR PANGANG SLAB CONTINUOUS CASTER

Wu Bing, Chen Yong, Shi Yazhou, Zhao Kewen, Yang Subo, Li Maolin, Wang Dijun

1999, 20(3): 19-23.

Abstract(23) PDF(1)

Abstract:
Based on measurement of strand surface temperature and solidified shell thickness, the average heat exchange coefficient and general solidification coefficient in various secondary cooling zones were obtained The state-of-art of secondary cooling was evaluated considering various factors The results obtained form an important basis for optimization of secondary cooling schedule and improvement of caster efficiency.

EFFECT OF VANADIUM CONTENT ON WELDABILITY OF HIGH STRENGTH RAIL STEEL

Xu Quan, Mei Dongsheng, Ran Xiaofeng

1999, 20(3): 24-29.

Abstract(22) PDF(1)

Abstract:
The effect of different vanadium contents on weldability of high strength rail steel was investigated by means of thermal simulating test. The results obtained show that the addition of about 0 08% vanadium to the rail steel has no harmful effect on the microstructure and properties of heat affected zone(HAZ).

RATIONAL ORE MATCHING TEST FOR SINTERING AT PANGANG

He Qun, Gan Qin, Li Hongfang, Du Chi, Sun Kang

1999, 20(3): 30-36.

Abstract(17) PDF(1)

Abstract:
The ore Matching tests for sintering were carried out with several common iron ore powder used at Pangang The rational ore matching scheme and relative technical parameters were obtained The results obtained provide an important basis for selecting rational ore matching scheme used for practical production.

STUDY OF COMBUSTION SCHEDULE FOR IMPROVED INTERNAL COMBUSTION HOT STOVE

Qi Shuangyang, Li Hongfang, Jiang Sheng, Shi Shixiong, Rao Jiating, Diao Risheng, Zhang Shankun, Guan Yong

1999, 20(3): 37-42,64.

Abstract(18) PDF(1)

Abstract:
Based on the features of equipments for improved internal combustion hot stove of 2^# blast furnace at Pangang, the rational combustion schedule of the hot stove was investigated.The main parameters such as air-gas ratio, gas amount, gas pressure and operating period etc.were optimized so as to increase hot blast temperature by average 50℃.

THERMODYNAMIC ANALYSIS OF PREPARATION OF METALLIC VANADIUM(V), VANADIUM CARBIDE (VC) AND VANADIUM NITRIDE (VN)

Liang Lianke

1999, 20(3): 43-46.

Abstract(23) PDF(1)

Abstract:
The thermodynamic characteristics of (V-O-C-N) and (V-O-H-N) systems are analyzed and discussed by means of thermodynamic method.The results obtained provide the theoretical basis for preparation of metallic vanadium, its carbide and nitride when carbon or hydrogen is used as reductant and vanadium oxides as raw materials.

ELECTRONIC STRUCTURE OF CEMENTITE OF NEW G99 HIGH STRENGTH AND HIGH TOUGHNESS STEEL

Zhang Guoying, Liu Guili, Zeng Meiguang, Qian Cunfu

1999, 20(3): 47-51.

Abstract(15) PDF(1)

Abstract:
The electronic structures of cementtite and alloy cementtite in new G99 high strength and high toughness steel were calculated using Recursion method The local density of state, atom Valence, the number of orbit electrons of different alloy elements and the Fermi energy, structure energy of cementite, alloy cementite were presented The valence features of cementite and alloy cementite and their effects on physical properties of G99 steel were discussed.

FACTORS INFLUENCING VANADIUM CONTENT IN HOT METAL SMELTED IN PANGANG BLAST FURNACE

Zhang Wenxin, Li Zhencai, Rao Jiating, Fan Yundong, He Shaogang

1999, 20(3): 52-57.

Abstract(19) PDF(1)

Abstract:
The main factors influencing vanadium content in hot metal smelted in pangang blast furnace were analyzed.The results obtained show that the ways to increase vanadium content in hot metal are optimization of BF burden structure and relative operation regulations, increase in total vanadium amount in BF burden and improvement of vanadium recovery.

INVESTIGATION OF OPTIMUM ANALYTICAL PARAMETERS FOR PLASMA OPTICAL SPECTROMETER

Cheng Yong, Xiao Jun, Ning Yanping

1999, 20(3): 58-64.

Abstract(20) PDF(1)

Abstract:
The experiments for selecting optimum analytical parameters of simultaneous determination of twelve elements, i.e.Si, Mn, P, V, Ti, Cu, Co, Ni, Cr, Mo, Mg, Al in carbon steel and low-alloy steel were carried out using new type(IRIS/HR)plasma optical spectrometer.The effects of analytical spectral line, back ground correcting point, high frequence power, carrier gas pressure, flow rate of liquid sample and auxiliary gas on analytical results were investigated.The analytical parameters selected are used for analyzing standard sample.The results obtained show that the features of this method are simple, rapid and accurate.

1999, 20(3): 65-66.

Abstract(11) PDF(1)

Abstract:

1999 Vol. 20, No. 3