钢铁钒钛

APPLICATION AND DEVELOPMENT OF VANADIUM-TITANIUM-NIOBIUM-MICROALLOYED STEELS AT ANSHAN IRON ＆ STEEL CO.

Lin Zi-quan, Ao Lie-ge, Hao Sen

2001, 22(1): 1-6.

Abstract(37) PDF(1)

Abstract:
The roles of vanadium,titanium,niobium microalloying in steels were described.the development work done by An Steel and the prospects for V-Ti-Nb microalloyed steels were introduced.

MY HUMBLE OPINION CONCERNING OPTIMIZATION OF REINFORCED BAR FOR CONSTRUCTURE

Xu You-lin

2001, 22(1): 7-15.

Abstract(24) PDF(0)

Abstract:
The reinforced bars in China are characterized by a great variety,lower Strength,bad ductility of some reinforced bars.Therefore,the reinforced bars made in China are difficult to suit the needs of development of concrete structure.Based on the requirement of the concrete structure in the properties of the stressed reinforced bar,the existing reinforced bars are analyzed and compared in respect of strength,ductility,quality stability,anchorage property,constructure adaptibility and economics etc.On the basis of a national conditions and changes of constructure market,a series of proposals were put forward,such as spreading Ⅲ-grade reinforced bar,middle-high strength steel wire and stranded wire,development of Ⅱ,Ⅲ-grade small diameter reinforced bars,optimization or elimination of cold working reinforced bar and development of the technology concerning reinforced bar etc..

PRODUCTION OF NEW Ⅲ-GRADE 20MnSiV CONCRETE STEEL USING DIRECT VANADIUM BEARING SLAG ALLOYING

LIANG Xin-Wei, LIU Wei

2001, 22(1): 16-20.

Abstract(31) PDF(0)

Abstract:
The new Ⅲ-grade 20MnSiV concrete steel was smelted in converter with vanadium bearing ball,i.e. the mixture composed of vanadium bearing slag and reductant.The results obtained show that while low-alloy steel is made, it is feasible and economic to replace ferrovanadium or V₂O₅ alloying with vanadium bearing ball alloying in molten steel ladle.

APPLICATION OF VN ALLOY IN 400MPa-GRADE REINFORCED BAR

GONG De-ping, HE Ming-xing, LUO Kai-jin, CENG Guang, MEI Cheng-yun

2001, 22(1): 21-25.

Abstract(29) PDF(0)

Abstract:
The results of tests for production of 400MPa-grade vanadium bearing concrete steel(Ⅲ-grade 20MnSiV concrete steel)using VN alloying and ferrovanadium alloying were introduced.The effects of vanadium and nitrogen microalloying on the properties and microstructure of the reinforced bar were investigated.The mechanism of VN strengthening was discussed.the costs of VN or ferrovanadium alloying were compared.

EFFECT OF VN ALLOYING ON MICROSTRUCTURE OF 20MnSiV CONCRETE STEEL

TANG Dai-ming, ZHANG Chun-lan, XU Ben-ping, GONG De-ping, TANG Jing

2001, 22(1): 26-29.

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The microstructure and vanadium precipitates in 20MnSiV concrete steel produced using VN and Fe-V alloying were investigated.The results obtained show the more ferrite and less pearlite exist in 20MnSiV steel with VN alloying. The amount of vanadium precipitates increase obviously It is estimated that the 20MnSiV concrete steel produced with VN alloying has higher yield strength and lower impact transformation temperature.

REVIEW AND PROSPECT OF TECHNOLOGY FOR VANADIUM RECOVERY FROM HOT METAL IN CONVERTER AT PZH STEEL

ZHANG Da-de, ZHANG Yu-dong

2001, 22(1): 30-33.

Abstract(19) PDF(1)

Abstract:
The development and optimization of the technology for vanadium recovery from hot metal at PZH Steel Were reviewed through analysis of different processes for vanadium recovery from hot metal. The train of thought on future technology for vanadium recovery from hot metal in converter at PZH Steel was put forward.

MICROSTRUCTURE CHARACTERISTICS OF FLASH WELDED HAZ OF COLD ROLLED LOW CARBON SHEETS

SONG Li-qiu, ZHOU Yu, LI Gui-xue

2001, 22(1): 34-39.

Abstract(31) PDF(0)

Abstract:
The microstructure,subregion micro-hardness distribution and microwidth of flash welded HAZ of cold rolled low carbon sheets having different composition （steel A and B） were investigated. The results obtained show the microstructure characteristics of the welded HAZ of the cold rolled low carbon sheets （steel A and B） are same,but the ferrite grain sizes are different.On the basis of the microhardness variation,the HAZ is divided into five subregions. The microstructure characteristics change obviously from the fusion zone of the welded HAZ to the basis material with far away from the fusion zone. Compared with the steel B,the HAZ microwidth of the steel A is wider,but the microhardness is lower in contrast to the basis material. Therefore,the role of “restrain strengthening” reduces, the softening takes place in the HAZ. In contrast to steel A, the softening doesn’t take place in the HAZ of the steel B.

CHARACTERISTIC ANALYSIS OF CAVITY DEFECT IN COLD ROLLED SHEET OF LOW CARBON Al-KILLED STEEL

FANG Shu-fang, QIU Tao, CENG Qing-jiang, CHEN Xing-yuan, WANG Zheng, ZHOU Yu

2001, 22(1): 40-47.

Abstract(23) PDF(0)

Abstract:
The macroexamination and micro-examination of the characteristics of the common cavity defect in cold rolled sheet of low carbon Al-killed steel were carried out. The results obtained show the cavity defects are divided into three types. The cavity formed due to normal tensile crack is related to the inclusion in the basis sheet. while the spalls from the basis material or the foreign matter are forced into the basis sheet,the scar and pit type cavities are formed.The rest is related to rolling process.

DEVELOPMENT OF DESULPHURIZER FOR RH VACUUM TREATMENT OF MOLTEN STEEL

WANG Ming-dong, YANG Su-bo, ZHAO Qi-yun, ZHANG Xiao-ling, TAN Ji-yun, LI Ying

2001, 22(1): 48-52.

Abstract(23) PDF(0)

Abstract:
The experiment for desulphurization of molten steel under vacuum condition was carried out in 10kg vacuum furnace.The results obtained show that the desulphurising capbility of CaO-CaF₂ system is better than that of CaO-CaF₂-Al₂O₃ system.The pre-melted desulphurizer is characterized by higher and stable desulphurising percentage,good moistureproof ability and less erosion of the refractory.

MATHEMATIC MODEL FOR PREDICTING TEMPERATURE OF MOLTEN STEEL FOR CONTINUOUS CASTING AT PZH STEEL

ME Qiu-yang, LI Wei, CHEN Yong, HUANG Dao-xin

2001, 22(1): 53-58.

Abstract(40) PDF(0)

Abstract:
The mathematic model for predicting temperature of molten steel for continuous casting was developed on the basis of temperature drop law of molten steel at PZH steel.Based on the results of the model calculation, a series of measures for controlling temperature of molten steel were put forward and used.The overheating degree of the molten steel in tundish was controlled below 25℃.

PRACTICE AND ANALYSIS OF SPLASHING SLAG IN CONVERTER AT PZH STEEL

LIU Xin, WANG Er-jun, ZHANG Huai, CHEN Kun

2001, 22(1): 59-62.

Abstract(37) PDF(0)

Abstract:
The slag splashing practice and obtained results were introduced under conditions of steelmaking from semi-steel at PZH Steel.The problems present in slag splashing in converter at PZH Steel were analyzed.

STUDY OF TEST AND MEASUREMENT METHOD FOR COEFFICIENT （mVALUE）OF STRAIN RATE SENSITIVITY

ZHANG Xiao-hua, QIU Xiao-gang, LU Guo-qing, TANG Jing

2001, 22(1): 63-68.

Abstract(34) PDF(1)

Abstract:
The coefficient （ m value） of strain rate sensitivity was determined using rate sudden changing and iso-strain rate tensile test.The effects of stretching speed change and different speed changing positions on the m value determined were discussed. The results obtained show the m value determined is increased as the stretching speed is raised, The m values of different materials were measured and analyzed under same test conditions.

2001, 22(1): 69-71.

Abstract(15) PDF(1)

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2001, 22(1): 71-75.

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2001 Vol. 22, No. 1