钢铁钒钛

NON-{111} TEXTURES IN COLD ROLLED MICRO-CARBON STEEL SHEETS AND THEIR FORMATION REASONS AND COUNTERMEASURES

LÜ Qing-gong, CHEN Guang-nan, CHANG Jun, CHENG Xing-de, TANG Li, ZHOU Jia-cong

2001, 22(4): 1-9.

Abstract(36) PDF(1)

Abstract:
Non {111}textures different from the normal ones in the trial of cold-rolled micro-carbon deep drawing steel sheets was introduced. The characteristics of the non-{111} textures and their influence on the plastic strain ratio of steel sheets were studied in the practical production and laboratory experiments. The evolution along the main processing steps and the formation features of cold-rolled textures were investigated based on above-mentioned conditions.The reasons for hot rolling of the non-{111}textures was analyzed and the effect of cold rolling ratio and heating rate during batch annealing on the non-{111} textures was investigated.Finally,the countermeasures for the control of textures in cold-rolled micro-carbon deep drawing steel sheets with respect to the formation characteristics of non-{111} textures and the conditions for {111} textures to be dominant are proposed.

DISSOLUTION,COARSENING AND PRECIPITATION OF TiN PARTICLE IN Ti MICROALLOYED STEEL DURING WELDING THERMAL CYCLE

CHEN Mao-ai, GAO Jin-qiang, YANG Min, TANG Yi-min

2001, 22(4): 10-15.

Abstract(21) PDF(2)

Abstract:
Carbon extraction replica analysis were carried out on the specimen in Ti microalloyed steel which is subjected to different stage of the welding thermal cycle so as to study the dissolution, coarsening and precipitation of TiN particle in Ti microalloyed steel during different stage of welding thermal cycle.It is concluded that at the low heating temperature stage (lower than 1200℃) of thermal cycle, the dissolution was characterized by shrinkage of particles and the number of particles did not decrease noticeably, which shows that particle coarsening was very weak.At the high heating temperature stage (1200~1350℃) of thermal cycle, a large number of small particles disappeared with the mean particle size increment.It is found that TiN particles dissolution still occurred due to lag effect.At high temperature zone of cooling stage, the particles are dissolved continuously.At lower temperature zone of cooling stage, free Ti and N were combined and TiN reprecipatated onto the survived particles, thus the mean size increase remarkably.The austenite grains coarsening mainly occurred in the cooling stage of the welding thermal cycle.

RESEARCH ON WELDABILITY OF SPOT WELDING HOT DIP GALVANIZED SHEET

LI Da-dong, YU Teng-yi, JIN Xiang, DIAO Yuan-sheng, LI Guo-an, LIN Jian-dong

2001, 22(4): 16-21.

Abstract(14) PDF(1)

Abstract:
Weldability of resistance spot welding joint in hot dip galvanized sheet was studied through orthogonal test.The optimum technological parameters of spot welding hot dip galvanized sheet were obtained.

EFFECT OF VANADIUM ON MICROSTRUCTURE AND STRUCTURE PROPERTIES IN SILICON - MANGANESE SERIES SPRING STEELS

LU Xiang-yang, GAN Guo-jian, KE Xiao-tao, WANG Rui-quan, DONG Jun

2001, 22(4): 22-27.

Abstract(29) PDF(1)

Abstract:
Effect of technics of heat treatment and vanadium amount in spring steels with different carbon,vanadium and silicon content on mechanical property and relax resistance had been studied.It is shown that higher austenitic temperature is beneficial to higher strength between 870~920℃.Increasing vanadium could increase the area of relax loop and relax resistance with the proper vanadium content 0.05%~0.10%.

ORTHOGONAL TEST OF OPTIMUM STRENGTH AND TOUGHNESS OF CONTINUOUS CASTING Ni-Cr-Mo-V STEEL

LIU Jing, DONG Li-na

2001, 22(4): 28-32.

Abstract(16) PDF(1)

Abstract:
Heat treatment technology parameters of continuous casting Ni-Cr-Mo-V steel with optimum strength and toughness were obtained through orthogonal test of 4 factors,3 levels and 9 experiments.It is presented that the cooling speed and tempering temperature are the main factors to improve strength and toughness of steel.Believed degree is 95%~99%.Quenching temperature and tempering time are less important factors.The best technological parameters are cooling speed 4.4℃ s,quenching temperature 620℃,tempering temperature 680℃,tempering time 40min, σ_s=571.6MPa and A_kv(-40℃)=192J.

A STUDY ON ELECTRICAL CONDUCTIVITY OF V₂O₅ FILM

YANG Shao-li, XU Chu-shao, HU Zai-yong, CHEN Guang-bi

2001, 22(4): 33-37.

Abstract(19) PDF(1)

Abstract:
A transparent,conductive V₂O₅ film is produced with industrial V₂O₅ from PZH Iron & Steel Corp.in an inorganic sol-gel method and its specific resistance is measured.The specific resistance of V₂O₅ films is relatively sensitive to temperature and humidity,which is a good humidity-sensing material.The specific resistivity of the film is reduced after drying and increased while wetting.Electrical resistivity rises with increasing of film thickness.

MODIFICATION OF THE LADLE SLAGS TREATED WITH AND WITHOUT DESULPHURIZATION OF HOT METAL AT PANGANG

GUO Xing-zhong, LI Jing-ming, WEN Guang-yuan, ZHANG Bing-huai

2001, 22(4): 38-42.

Abstract(34) PDF(2)

Abstract:
The Modification of the two kinds of ladle slag treated with and without desulphurization of V-Ti-bearing hot metal at PZH Steel Corp.was studied.The effects of sorts of slag,basicity,modification agent and desulphurizer on modification of slags had been investigated.It is concluded that the modification of ladle slags treated with and without desulphurization V-Ti-bearing hot metal is beneficial to the operation of desulphurization of V-Ti hot metal.

A RESEARCH ON HIGH-Ti BLAST FURNACE SLAG CRUSHED STONE APPLIED FOR CONCRETE AGGREGATE

ZHOU Xu, LI Jiang-long, LUO Chong-li

2001, 22(4): 43-46,68.

Abstract(23) PDF(1)

Abstract:
Structure of blast furnace slag with 15% TiO₂ at Pangang is different from the normal blast furnace slag.Based on experiments on the property of Ti-bearing slag and its application in the concrete,it is concluded that the structure of high-Ti blast furnace slag is stable and compressive strength and breakage strength are higher than the latter, as compared with normal crushed stone used for concrete aggregate.Otherwise,the stability of it had been proved by the example of application.Development and utilization of the blast furnace slag are very important for the environmental protection and increasing slag yard lifetime at Pangang.

AN INVESTIGATION ON MELTING FERROTITANIUM PROCESS IN THERMITE METHOD

XIAO Xiang-hong, LIU Ming-yang, LUO Fa-ying

2001, 22(4): 47-51.

Abstract(19) PDF(1)

Abstract:
Melting 65%~75% Ti ferrotitanium process with rutile in thermite method was discussed.The optimum technical condition and index of production of 73.77% Ti ferrotitanium as the titanium recovery of 78.83% were obtained through the three experiments of levels 20 kg,200 kg and 500 kg and the influence factors in the test was discussed. As the result,it is possible to melting ferrotitanium with rutile in thermite method.

FEATURES OF COLD ROLLING CDCM PRODUCTION LINE AND MODIFICATION OF PANZHIHUA COLD ROLLED MILL

WANG Dan, CHEN Xin-an

2001, 22(4): 52-56.

Abstract(15) PDF(1)

Abstract:
Development upon CDCM production line at abroad and home was introduced and the features of CDCM production line and common problems for it were discussed.Modification of CDCM production line at Panzhihua cold rolling mill was also introducted.

TECHNICAL DEVELOPMENT AND MARKET PROSPECT FOR VANADIUM NITRIDE AT PANGANG

SUN Chao-hui, ZHOU Jia-cong, YANG Yang-jun

2001, 22(4): 57-60.

Abstract(24) PDF(2)

Abstract:
Prodution techniques at abroad and home and technical progress in vanadium nitride production at Pangang were introduced.Market prospect for vanadium nitride products is also expected.

2001, 22(4): 61-68.

Abstract(15) PDF(2)

Abstract:

2001 Vol. 22, No. 4