钢铁钒钛

A New Process for Vanadium Extraction from Molten Vanadium Slag by Direct Oxidation and Sodium Activating Method

Song Wenchen, Li Hong

2012, 33(6): 1-5.

Abstract(60) PDF(1)

Abstract:
To address the problem of heat waste of vanadium slag in the existing vanadium extraction process,a new process is proposed in this paper to extract vanadium from molten vanadium slag by direct oxidation and sodium activating method.On the basis of current vanadium extraction process,the new process...

Effect of Carbon Ratio on Vacuum Carbon Thermal Reduction of TiO₂

Zhou Yuchang

2012, 33(6): 6-10.

Abstract(104) PDF(1)

Abstract:
By using titanium dioxide and graphite as raw material,TiO₂/C vacuum carbon thermal reduction experiments were carried out to investigate the effect of carbon ratio on the TiO₂/C vacuum carbothermic reaction process and the reduction product.The experimental results indicates that the reduction proc...

Experimental Study on Two- step Synthesis of Vanadium- aluminium Alloy

Chen Haijun

2012, 33(6): 11-15.

Abstract(97) PDF(5)

Abstract:
Main factors affecting vanadium-aluminum alloy smelting by two-step process were studied,and the products were analyzed through metallographic inspection.The results show that vanadium yield and apparent quality of the products can be noticeably improved by applying appropriate unit burden heat and ...

Effect of Ti on the Microstructure and Thermal Fatigue Property of ZA27 Alloy

Dong Xingsheng, Si Naichao, Si Songhai, Zhang Zhijian, Liu Rong

2012, 33(6): 16-21.

Abstract(52) PDF(1)

Abstract:
The effect of Ti modification on microstructure and thermal fatigue property of ZA27 alloy is discussed in this paper.The samples’ microstructure and morphologies of cracks caused by thermal fatigue are examined by optica1 microscopy（OM） and scanning electron microscopy（SEM）,and mechanism of Ti modi...

Research on In- situ Synthesis of （V,Nb） C Reinforced Iron Matrix Composite and Its Microstructure

Xian Yong, Wang Yisan, Ding Yichao, Wang Jing

2012, 33(6): 22-25,30.

Abstract(81) PDF(2)

Abstract:
In-situ synthesized（V,Nb）C reinforced iron matrix composites with sintering density of 7.07 g·cm-3 at 1 360 ℃were prepared by powder metallurgy process.The microstructure of the composites were investigated by X-ray diffraction（XRD）and scanning electron microscope（SEM）respectively.The results show t...

Preparation of MnO_x-MoO₃ /TiO₂-Al₂O₃ Catalyst and Its SCR Denitration Performance

Liu Renlong, Xie Yinyin, Wu Xuhong, Liu Changkang, Du Jun, Tao Changyuan

2012, 33(6): 26-30.

Abstract(81) PDF(1)

Abstract:
MnO_x-MoO₃/TiO₂-Al₂O₃（MMTA） catalysts with various loads of Mn and Mo were prepared by dipping method,and its catalytic activity was studied in the selective catalytic reduction of NO with NH₃（NH₃-SCR）.The effects of temperature and different carrier on the SCR reaction were evaluated in the fixed be...

The Novel Technology of Two-step Roasting Desulfurization for Sulfur-bearing Slag

Cui Yuyuan, Wang Deyong, Liu Chengjun, Jiang Maofa

2012, 33(6): 31-34.

Abstract(85) PDF(1)

Abstract:
The existence of sulfur in steel slag restrains its recycle and re-use in steelmaking process.To recycle the waste slag as much as possible,a novel approach of two-step roasting desulfurization has been proposed in this present study.The thermodynamic analysis shows that CaO stable region in Ca-S-O ...

New Treatment Process for Three Wastes Generated from Chloride TiO₂ Pigment Production

Sun Hongtao

2012, 33(6): 35-39.

Abstract(64) PDF(2)

Abstract:
In view of shortcomings in conventional ’three wastes’ treatment method,a new process is developed to deal with the wastes generated from chloride TiO₂ pigment production.In the process,waste slag from chlorination can be slurried with acid waste water produced from washing off-gas,and then it can b...

Study on Metallurgical Effects of M- EMS during Bloom Continuous Casting

Li Zhiqiang

2012, 33(6): 40-44.

Abstract(77) PDF(1)

Abstract:
In this paper,M-EMS magnetic field intensity and bloom quality at different periods is counted,and on this basis,the effect of magnetic field intensity of M-EMS on casting bloom quality is analyzed.Different magnetic field intensity in a single strand can be obtained by changing the current intensit...

Characteristics of the Shell with Sticking Breakout Problem and Temperature Variation of the Mold’s Thermocouple in Slab Casting

Pei Hongbin, Zhang Hui, Xi Changsuo, Wu Yeming, Shi Zhe

2012, 33(6): 45-48,62.

Abstract(119) PDF(1)

Abstract:
In order to study the formation mechanism of sticking breakout in slab and prevent its occurrence,main characteristics such as thickness,crack and oscillation mark of the solidified shell are analyzed.A mathematical model simulating the acting force on primary solidified shell is developed.Based on ...

Formation Mechanism of the Meniscus Solidified Hook in the Continuous Casting Mold

Cao Chunlei, Zhou Li

2012, 33(6): 49-52.

Abstract(118) PDF(1)

Abstract:
A solidified hook was found by observing the macrostructure of a leaked strand.The general formation theory of solidified hook is revised in this paper.It is pointed out that during vibration of the mold,the existence of the negative slip results in variation in temperature in the solidified front a...

Influence of La₂O₃ on Physical Properties of B₂O₃-containing Fluoride- free Casting Powder

Li Rong, Guo Jiang, Zhang Fang

2012, 33(6): 53-57.

Abstract(74) PDF(1)

Abstract:
In order to solve the problem that B₂O₃-containing fluoride-free casting powder tends to refrain the formation of crystals,crystallization properties of the fluoride-free mold casting powder and heat transfer of slag film were investigated with the basicity（CaO/SiO₂） of casting powder at 0.9,composi...

Study on Morphology and Size Distribution of Sulfide Inclusions in Free Cutting Steel AISI 1215

He Yingying, Zhou Cheng, Li Hongyou, Ma Han

2012, 33(6): 58-62.

Abstract(60) PDF(1)

Abstract:
The morphology and size distribution of MnS inclusions in AISI 1215 free cutting steel billet were studied.The results show that the sulfides evolve from type I to type II with the position moving from edge to center at the cross section.Based on Uhlmann model and chemical compositions of the billet...

Numerical Simulation of Fluid Flow and Thermal Characteristics in the Funnel-type Mold with Different Width

Xu Mianguang, Liu Heping, Chen Yuanqing

2012, 33(6): 63-68.

Abstract(61) PDF(1)

Abstract:
The width of the thin slab mold can be changed to produce different steel grades to satisfy the needs of customers.Therefore,it is necessary to study the fluid flow,heat transfer and solidification behavior in the mold.In this paper,the coupled model was adopted to analyze the fluid flow,heat transf...

Research on Precipitation of Inclusions in Calcium- treated Sulfur- containing 20CrMo Gear Steel

Guo Dengyang, Wu Xiaodong, Chen Ruilong, Tan Shengkang

2012, 33(6): 69-73.

Abstract(75) PDF(1)

Abstract:
In order to meet the rating requirement for inclusions in the steel,the additive amount of calcium to the steel was controlled through thermodynamic calculation,and after calcium treatment,Al₂O₃ was modified to low-melting-point 12CaO·7 Al₂O₃ which could be removed from 20CrMo steel.Thermo-Calc soft...

Experimental Study on Two-dimensional and Three-dimensional Morphology Differences of Non-metallic inclusions in Aluminum Killed Steel

Tian Yonghua, Bao Yanping, Wang Min, Ruan Wenkang

2012, 33(6): 74-79.

Abstract(67) PDF(1)

Abstract:
By taking non-metallic inclusions in aluminum killed steel as object of study,the advantages and disadvantages of metallography method and extraction method are comparatively used to observe the differences of the inclusions’two-dimensional and three-dimensional morphologies.As inclusions in the ste...

Research on Influence of Rare Earth on ICDP Roll Structure and Thermal Fatigue Resistance

Wang Weiguo, Li Zhonghua

2012, 33(6): 80-85.

Abstract(76) PDF(1)

Abstract:
Liquid iron was modified by adding rare earth at later stage of melting,and metallographic and thermal fatigue tests were carried out to investigate the effects of different contents of rare earth on structures and thermal fatigue performance of rolls.The test shows that when the content of rare ear...

Thermodynamics Analysis on the Precipitation of Titanium Nitride in a Welding Wire Steel

Chen Tao, Li Hong, Lü Naibing, Tang Guozhi, Wang Lifeng, Wu Keng

2012, 33(6): 86-90.

Abstract(90) PDF(3)

Abstract:
As a kind of main non-metallic inclusions of ER50-G for welding wire,TiN has an obvious influence on the property of ER50-G.The sample with a Ti content of 0.16% obtained from the production process of ER50-G is examined by FE-SEM.Based on the chemical composition of the wire rod,the critical temper...

Analysis and Countermeasures of Bulging Defect at the Edge of Cold-rolled Products

Dou Zhiyong, Huang Bin, Feng Shaoqiang

2012, 33(6): 91-94.

Abstract(79) PDF(2)

Abstract:
Bulging defects at the edge of strip steel forming during cold rolling process and corresponding measuring data are analyzed.It is concluded that local high spots at hot rolled strip steel are the major causes of the defects.In addition,convexity and wedge of the hot rolled plates and rolling length...

Precipitation Behavior and Texture Formation at Different Stages of Processing in Ti-IF

Feng Yanqing, Wang Fuming

2012, 33(6): 95-98.

Abstract(71) PDF(2)

Abstract:
The precipitation behavior and texture formation during hot rolling,cold rolling and annealing（at 700 ℃ and 800 ℃） have been studied in a Ti-containing interstitial freesteel.The presence of FeTiP in the 700 ℃ annealed steel and its absence in the 800 ℃ annealed material are considered to be respons...

Study on The Method for The Determination of Vanadium in V- Al Alloy

Zheng Xiaomin, Yang Ping, Dan Juan, Wu Jianguo, Luo Yunchuan

2012, 33(6): 99-102.

Abstract(71) PDF(2)

Abstract:
In this paper,the ammonium ferrous sulfate titrimetric method for the determination of vanadium in V-Al alloy has been established,which used HCl+HNO₃ to decompose the sample,used ammonium persulfate oxidate the vanadium to pentavalent in the 6~7 mol/L sulfuric acid.The determination conditions,such...

2012, 33(6): 103-105.

Abstract(48) PDF(1)

Abstract:

2012 Vol. 33, No. 6