钢铁钒钛

Effect of Liquid Steel Superheat on Solidification of Bloom in Continuous Casting

Li Guijun, Zhang Guifang, Chen Yong, Zhao Guoyan, Cai Kaike

2005, 26(1): 1-4.

Abstract(19) PDF(2)

Abstract:
Some solidification processes were analyzed by explicit finite-different method under different locale crafts. The effects of superheat on the shell's thickness leaving mold, the surface temperature of casting blank, the shell's thickness in casting solidification and the length of liquid core were simulated. The results show that the shell's thickness leaving mold is thin, surface temperature is a bit increase, the shell's thickness in casting solidification is thin and liquid core is long as the superheat is increase at the same draw speed.

Study on Working Layer Materials of Mill Composite Liner

Fu Hanguang, Huang Zhaojun, Song Jinchun, Xie Liyang

2005, 26(1): 5-9,19.

Abstract(20) PDF(1)

Abstract:
A kind of material which was fit for the working layer of blast composite liner was successfully developed. A series of research was particularly carried out, such as the liner composition, the action and adding amount of alloying elements, the melt and rolling processes. After quenching in oil and tempering at middle temperature, the hardness of working layer material was over 60HRC, the tensile strength was over 1 600 MPa, the impact toughness and fracture toughness exceeded 18J/cm² and 37MPa·m^0.5 respectively. Used in the steel pipe rolling mill, the wear resistance of composite liner is one time longer than that of bead weld liner.

Research on Water Model of Mold Level Fluctuation

Hu Hao, Zhao Heming, Zhang Jiongming, Wang Xinhua, Wang Wanjun

2005, 26(1): 10-15.

Abstract(27) PDF(1)

Abstract:
The wave difference was firstly applied to evaluate the mold level fluctuation. According to the continuous casting mold of a plant, the water model was made in the proportion to 1:1 from slab mold, and the effects of SEN angle, entry depth and mold width on the wave difference were studied. The technical parameters, which guarantee the most perfect fluctuation at various location of mold, were presented based on a great deal of experimental data.

Study on High Strength Heavy Plate Microalloyed with V-N

Yang Xiong, Jin Yongchun, Wang Quanli, Zhang Gongyan

2005, 26(1): 16-19.

Abstract(10) PDF(1)

Abstract:
The contrast experiment of rolling heavy steel plate microalloyed with V-N and V at Shougang was carried out. The results show that adding appropriate N into steel can intensify the precipitation strengthening and fine grain strengthening of V, and the appropriate N content in V-contained steel has no disadvantage to the performances of the steel. The 60 mm and 70 mm specification heavy plates were produced with V-N microalloying combined with controlled rolling replacing the heat treatment process. The performances of the plates meet the demand of Q390E steel.

Research on Ultra-fine Grain and Ultra-High Toughness Steel Plate

Yao Liandeng, Li Zigang, Zhang Pijun

2005, 26(1): 20-25.

Abstract(16) PDF(1)

Abstract:
The structure ultra-fining technological test on the heavy plate rolling machine and the results were presented. The high strength plate with 40mm thickness and ultra-fine grain surface layer was produced by use of temperature-reversion rolling process. A production process of ultra-fine grain medium plate (thickness:12mm and 20mm) by use of multi passes and small reduction rolling process was researched. A new kind of structural steel plate with special microstructure was developed through combining thermal mechanical rolling with re-crystallization treatment to micro-alloy steel. This new kind of structural steel can be used in the structure required ultra-high crack restrain property and provide a kind of high property material for ship, bridge, large scale building, steel structure and so on,because it has far more excellent toughness than the same composition micro-alloyed steel.

Development of Uitra-Fine Grain Steels in Anshan Steel Group

Sun Jianlun, Zhang Wanshan, Wang Keqiang, Guan Ju, Ren Yuhui, Wang Guodong

2005, 26(1): 26-29.

Abstract(21) PDF(1)

Abstract:
The development of ultra-fine grain hot-rolled strips and wire rods in Anshan Steel Group was introduced. The development thought was to find a new low-cost production process for ultra-fine grain steels according to the practical equipments and production process in Anshan Steel Group. The developed products can be manufactured stably on a large scale, and their application behaviors are perfect.

Development of Ultra-fine Grained Steel at Benxi Steel

Zhou Hongwei, Weng Yu, Jin Yuegui

2005, 26(1): 30-33.

Abstract(24) PDF(1)

Abstract:
The development of ultra-fine grain steels at Benxi Steel was introduced. CX400 and CX500 steels were developed based on carbon steel. Cu-P-Ti-RE and Cu-P-Cr-Ni series ultra-fine grain steels were developed based on weathering steel 09CuPTiRE and SPA-H. The results show that the chemical compositions and the rolling process parameters of ultra-fine grain steels are reasonable. The steels have ultra-fine grains and good properties. They are applied to manufacture automobile structures, railway vehicles and containers.

Improving Photostabilization Functions of Powder Coating with Rutile Nano-TiO₂

Cao Jianjun, Guo Gang, Wang Binhua, Tu Mingjing

2005, 26(1): 34-39,44.

Abstract(18) PDF(1)

Abstract:
The polyester powder coating was modified with rutile nano-TiO₂ as anti-aging additives. The properties and features of rutile nano-TiO₂ were described by some indicating methods, such as TEM, XRD and so on. Water-suspend absorption UV-Vis spectrum of rutile nano-TiO₂, anatase nano-TiO₂ and rutile titanium white was studied. Polyester powder coating was degradated by accelerated aging test with high pressure mercury-arc lamp. The UV-shield mechanism of nano-TiO₂ was discussed. The variation of color and gloss for polyester powder coatings was compared during the weathering test, which include polyester powder coating modified with rutile nano-TiO₂ and polyester powder coating modified with UV absorbent. The results show that rutile nano-TiO₂ can upgrade photostabilization functions of polyester powder coating, improve the weatherproof property of polyester powder coating, and prolong the service life of polyester powder coating.

Research on Modifying Exterior Latex Coating with Nano-TiO₂ and Nano-SiO₂

Wu Jianchun, Sun Zuofeng, Huang Wanxia

2005, 26(1): 40-44.

Abstract(30) PDF(1)

Abstract:
The nano-modified latex coatings were prepared through adding nano-TiO₂ and nano-SiO₂ powder into normal latex coatings and using a special dispersing technology. The testing results show that the nano-powders additive can evidently enhance the weather resistance and scrub resistance of latex coatings. The weather-resisting mechanism and scrub-resisting mechanism of latex coatings were discussed, and so explaining the improving reason of the weather resistance and crab resistance.

Analysis of Super-plasticity Diffusion Bonding Joint with Phase Transformation for Titanium Alloy and Stainless Steel

Liao Hongjun, Sheng Guangmin, Huang Jiawei, Qin Bin, Qiu Shaoyu, Li Cong

2005, 26(1): 45-49.

Abstract(19) PDF(1)

Abstract:
The super-plasticity diffusion bonding process with phase transformation for TA17 titanium alloy and 0Cr18Ni9Ti stainless steel was investigated. The microstructure, element diffusion and appearance of joint were analysed. The results show that the elements both in Ti alloy and in stainless diffuse on different degree, so forming β-Ti, TiFe and TiFe₂ at the interface. Controlling the thickness of intermetallics compound within 5 μm can improve the strength of the joint. The solid solution based on β-Ti undertakes the main joint strength. The surface area of β-Ti phase affects the strength of joint very greatly. The larger the area is, the higher the joint strength is, vice versa.

Fracture Analysis of High Carbon Steel during Drawing

Jin Qingfeng, Wang Haitao, Xu Zhongbo, Tang En, Wang Yanfeng

2005, 26(1): 50-54.

Abstract(25) PDF(1)

Abstract:
The failure fracture of the high carbon steel during drawing to ƒ0.2~ƒ0.25mm was analyzed by scanning electron microscope. The fracture shape and the inclusion composition of the fracture were analyzed respectively. The forms and the reasons of the fracture were found out by adopting the point scanning and the surface scanning of the electron probe. The results show that the brittle inclusion is the main reason of causing the fracture, and the central segregation and surface defect may also result in the fracture. The solutions of fracture are put forward.

Heat Transfer Analysis of BF Cast Steel Cooling Stave Based on ANSYS

Qian Zhong, Cheng Huier

2005, 26(1): 55-59.

Abstract(22) PDF(1)

Abstract:
The heat transfer of BF cast steel cooling stave under steady state was analyzed by using engineering software ANSYS. The distribution of temperature, heat flux and temperature gradient of the stave under steady state was discussed based on calculation. Through the analysis, the places where should be paid attention to was presented under working condition, and this could be a reference for future maintenance and design of stave. Besides, the influence of cooling water-pipe scale on the temperature field of BF cooling stave was discussed. The results reveal that 1 mm thickness scale will cause about 60℃ increase on the hot surface of cooling stave.

Influence of Process Parameters on Rail Height and Base Width

Guo Hua, Deng Yong, Tao Gongming

2005, 26(1): 60-64.

Abstract(26) PDF(1)

Abstract:
The influence of process parameters on the rail height and base width during final pass rolling was analyzed by MSC.Marc. The process parameters include rolling temperature, reduction, roller wear, friction coefficient and the stock size before deformation. The quantitative relations between process parameters and rail height and base width were set up.

Determination of Nitrogen Content in Ti（CN） by Chemical Method

Zhong Hua

2005, 26(1): 65-68.

Abstract(21) PDF(1)

Abstract:
The experimental conditions of the neutral titration method for determining the nitrogen content in (Ti(CN)) after wet process fusion in H₂SO₄+K₂S₂O₇ and distillation separation were investigated by orthogonal design optimization method, and the analytical method was developed. The determination results are consistent with those obtained by thermal conductivity method after fusion in inert gas.

2005, 26(1): 69-70.

Abstract(15) PDF(1)

Abstract:

2005 Vol. 26, No. 1