钢铁钒钛

EFFECT OF VANADIUM ON HEAT RESISTANCE OF HIGH CHROMIUM CAST IRON

Chen Jingju, Qing Shangsheng, Yu Zisu, Li Yuhe, Zhong Bing

1997, 18(1): 1-8.

Abstract(26) PDF(0)

Abstract:
The high temperature oxidation resistance and rapid cooling and heating resistance of high chromium cast iron,and effects of vanadium and various alloying elements on heat resistance of high chromium cast iron were investigated. The heat resistance of high chromium cast iron is adversely influenced by vanadium. Therefore, the vanadium content in high chromium cast iron used for metallurgical spare parts is seriously controlled.

STUDY ON REDUCTION OF VANADIUM OXIDE IN THE TITANIA SLAG CONTAINING MnO

Qu Yanping, Du Hegui

1997, 18(1): 9-12,21.

Abstract(24) PDF(0)

Abstract:
Study on reduction of vanadium oxide in titania slag containing 0~5% MnO. The results of experiment show that the apparent equilibrium constant (IgK_si-v) of Si-V increases with increasing initial MnO,and decrease with increasing initial TiO₂,with increasing slag basicity when R >1. 2. The reduction reaction of vanadium oxide can't reach equilibrium in the blast furnace. The reduction of vanadium oxide is restricted by dynamic condition. Reduction reaction is one of two steps. The apparent activation energy is equal to 172 kJ/mol. The reduction rate of vanadium oxide is restricted by V³⁺ diffusion in slag during initial reduction. But it is restricted by SiO₂ reductionrate when Si-V coupled reaction has reached equibrium. Some measures of increasing the reduction rate of vanadium oxide were pointed out.

RESEARCH ON FULL-SCALE FATIGUE TESTING CONDITIONS OF STEEL RAIL

Wu Zhaoquan, Ning Xiongxian

1997, 18(1): 13-17.

Abstract(16) PDF(0)

Abstract:
The article mainly discusses the full-scale fatigue testing of steel rail with the material tester MTS TestStar,the results of which indicate that it is necessary to further clarify and specify the specifications originally defined for the testing conditions in the standard TB1354-79. Within the range of testing conditions,the increment of loading frequency does not affect the test result, while the excessive gripping force may give rise to detrimental influence.

STUDY ON FOAMING AGENT FOR MOLTEN LF SLAG

Li Zhongchao, Yang Jian, Zhang Xiaoling, Zhao Qicheng, Song Jingxin, Ren Zhengde, Yan Guangting, Tang Ping

1997, 18(1): 18-21.

Abstract(25) PDF(0)

Abstract:
In this paper the effect of the carbonate foaming agents which are composed of dolomite, limestone and barium carbonate on the foaming of molten LF slag is discussed. In the laboratory the nine kinds of foaming agent are tested in the two kinds of molten slag. The foaming time and the foaming height of the molten slag are measured. The foaming index of the molten slag is calculated. The results show that the foaming agents of the single component have different foaming behavior because the decomposition temperatures of carbonate are different. The foaming index of the foaming agent composed of the three components (dolomite,limestone and barium carbonate),the mixture ratio of which is equal,is the largest in the nine kinds of foaming agent.

APPLICATION OF COMPOSITE MODIFIED HIGH CHROMIUM CAST IRON TO COLD ORE SIEVE PLATE

Fu Hanguang, Wen Mengxin, Yang Zhijun

1997, 18(1): 22-26.

Abstract(21) PDF(1)

Abstract:
With a review to the fact that domestic cold ore sieve plates are generally made of CrMnN heat-resisting steel, which has a short service life and freguent replacement, new sieve plates with wear-resisting high Cr cast iron containing K and rare earth have been developed. The installed application has shown that this sort of sieve plate has a better result in safety and reliability,the application of which is worth spreading.

PROPERTY ANALYSIS OF DOMESTIC AND FOREIGN HEAT-TREATED STEEL RAILS

Deng Jianhui, Zhang Kaihua, Yan Dong

1997, 18(1): 27-32.

Abstract(29) PDF(0)

Abstract:
The present paper mainly introduced the properties of full-length heat-treated steel rails produced by some major companies at home and abroad. The inspection analysis to the practical properties of some full-length heat-treated steel rails have proved that V-containing micro-alloyed heat-treated rail PD₃ made by Panzhihua Iron & Steel Corp. ranks first in the comparison of comprehensive mechanical property; the indexes of comprehensive properties of plain carbon heattreated rail PD₂ also produced by Panzhihua Iron & Steel Corp. is by no means inferior.to the foreign counterpart,the hardness and strength of Japan-made Cr-alloyed rail DHH with on-line heat treatment are equivalent to the off-line heat-treated carbon rail,but the toughness is slightly lower.

STATUS AND ANALYSIS OF METAL LOSS IN WIRE ROD PRODUCTION AT PANGANG

Zheng Deshun

1997, 18(1): 33-36,50.

Abstract(17) PDF(0)

Abstract:
As compared with the process technique and metal loss in wire rod production at home and abroad,analysis was made to study the status and cause of oxidation loss and cropping of front and back ends in wire rod production at Pangang. As a result,a counter measure was raised in the aspects of process improvement,production management,etc.

INVESTIGATION AND ANALYSIS CONDUCTED DURING OPERATION RESTORATION AFTER BLAST FURNACE OPERATION DISORDER FOR PANGANG BF NO.1

Wang Ge, Wang Hua, Deng Kaitian, Zhang Shankun, Luo Mingyin

1997, 18(1): 37-41.

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Abstract:
Since November of 1995 the BF No. 1 of Pangang (Panzhihua Iron & Steel Corp.) suffered an unstable operation with a big fluctuation of production level,during which the operation conditions once more deteriorated by the end of March, 1996.in order to restore the normal production as soon as possible,a fire shooting team was organized to tackle this problem in the iron works. The following analysis was carried out pursuant to the investigation conducted uninterruptedly during the operation restoration.

STUDY ON ROLL GAP ADJUSTMENT MECHANISM OF DOMESTIC-MADE HIGH SPEED NON-TWIST WIRE ROD MILL

Xia Wei, Zheng Deshun, Li Jiren

1997, 18(1): 42-46.

Abstract(31) PDF(0)

Abstract:
The present paper describes the composition and function of roll gap adjustment mechanism of high speed non-twist wire rod mill,noting that the problem existing in the roll gap adjustment mechanism for the early domestic-made high speed non-twist wire rod mill,to which a solution was suggested accordingly.

RESEARCH FOR IMPROVING THE HIGH SPEED COMPRESSION PERFORMANCE OF GLEEBLE-1500 THERMAL/MECHANICAL SIMULATION TESTER

Zhu Zongji

1997, 18(1): 47-50.

Abstract(23) PDF(0)

Abstract:
After a long time service,the high speed compression performance of the compression system of Gleeble-1500 thermal/mechanical simulation tester failed to meet the experimental requirement. The problem has been effectively solved by editoring the given program curve and other methods through experiment without replacing the corresponding components.

DISCUSSION ON SOME PROBLEMS EXISTED AT PRIMARY ROLLING PLANTS IN CHINA

Yang Geng, Jia Jihai, Zhao Wen, Chen Lin, Zhang Qin, Huang Juan

1997, 18(1): 51-53.

Abstract(16) PDF(0)

Abstract:
The problems existed at primary rolling plants in china are comprehensively analysed,and the necessary measures to increase the billet yield are proposed accordingly. The intrinsic problems found in the long top-fired soaking pit are discussed and the relevant modification schedule is raised herewith. Finally,the direction to renovate the finishing procedure is pointed out to meet the requirement of production.

REAL TIME COMMUNICATION BETWEEN VAX AND MICROCOMPUTER

Qing Jimin, Xie Xiaobin, Qi Xin, Zhou Yu, Zhang Bin, Pei Jiaji, Cao Zhangxiu, Zhang Bangli

1997, 18(1): 54-60.

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Abstract:
Introductions were made to the methods such as hardware connection, communication protocol. system initiation, change of different programming languages as well as real time communication beween mini-computer and microcomputer via RS-232 interace.

MEASUREMENT OF OYNAMIC STRENGTH WITH OSCILLOSCOPIC IMPACT IEST

Qiu Xiaogang

1997, 18(1): 61-64.

Abstract(23) PDF(0)

Abstract:
With the assistance of osoilloscopic impact technique,dynamic bending yield strength σ_yd and maximum behding yield strengih σ_max were derived by the graphit method on the basis of loading-displacement curve,and then cleavage fracture stress σ_f was obtained accordingly. The test result showed that the ratio of dynamic strength and static strength is 1.25~1.30,by which the value of low temperature tensile strength of material could be evaluated.

1997 Vol. 18, No. 1