钢铁钒钛

RESEARCH ON SECONDARY PHASE PARTICLES IN Ti MICROALLOYED STEEL AND HEAT-AFFECTED ZONE

CHEN Mao-ai, TANG Yi-min, ZHAO Neng

2000, 21(2): 1-5.

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Abstract:
The secondary phase particles in Ti microalloyed steel and heat-affected zone are investigated through the extraction replica and metal film electron microscopic analysis.It is concluded that main particles in Ti microlloyed steel and its heat-affect zone are TiN as well as little AlN.Crystal grain sizes are increased obviously and the quantity is reduced after thermal circulation.In comparison to steels with high Ti and N contents,the quantity of TiN particles in the steel with low Ti/N contents is more than those and grain size is less.During thermal circulation the low dissolving capacity and coarsing of TiN particles appear,which has widely hindered action on grain growth of original austenite.

TRIAL PRODUCTION AND APPLICATION OF HIGH STRENGTH AND TOUGHNESS R4 MARINE MOORING CHAIN STEEL

ZHANG Wen-ji, GUO Yan, ZHANG Yu-feng, MA Heng-yi, YANG Rui-zhen, ZHU Lin-fang

2000, 21(2): 6-11.

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The marine mooring chain steel (R4) has been developed through the composition design,heat-treatment performance investigation and pilot-plant test.Hot rolled bar has high tensile strength,high low-temperature impact value and good weldability,cold bendability and heat-treatment property over a wide range of quenching and tempering,which is fully enough to meet the technological requirements of producing chain and suitable for commercial chain manufacture.

DESULPHURIZING ABILITY OF MEDIUM TITANIA BF SLAG

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

2000, 21(2): 12-15.

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The desulphurizing capacity for medium titania blast furnace slag has been investigated on the basis of the study on physical properties of medium titania BF slag. Effect of slag constituent on desulphurizing capacity has been discussed.

ANALYSIS ON CONSTITUTION OF DESULPHURIZING SLAG OF MAGNESIUM-BASED DESULPHURIZING AGENTS AND DISCUSSION ON DESULPHURIZING MECHANISM

XU Guo-tao, DU He-gui

2000, 21(2): 16-20.

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The simulating tests on metallurgical effect of magnesium-based desulphurizing agents with various constitutions have been carried out and compared with CaO-based CaC₂-based desulphurizing agents.The constitutions of various desulphurizing agents are analyzed.As a result,the desulphurizing effect of magnesium-based Na₂O desulphurizing agent is better than others.

EFFECT OF COLD ROLLED REDUCTION RATIO ON DEEP-DRAWING PROPERTIES OF LOW CARBON Al-KILLED AND COLD ROLLED STEEL SHEET

CHANG Jun, CHENG Xing-de, XU Jian-zhong, ZHAO Yong-ping, LU: Qing-gong

2000, 21(2): 21-25.

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Effect of various reduction ratios on deep-drawing properties of cold rolled steel sheet has been investigated in laboratory with low carbon Al-killed and hot-rolled coils produced in Pangang hot rolled mill. It is concluded that cold rolled reduction ratio has no obvious effect on the conventional mechanical properties and n-value but effective effect upon r-value. For the low carbon Al-killed steel with 0.059% carbon,the maximum r-value is achieved at the reduction ratio of 73% and Δr -value is monotonously reduced with the increment of cold rolling reduction ratio.

STUDY ON WELD CRACKING SUSCEPTIBILITY OF COMPLEX MICROALLOYED AND LOW-CARBON SiMn3 BAINITIC STEEL

WU Hai-dong, CAO Peng-jun, XU Qi-kun

2000, 21(2): 26-28.

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Weld caracking susceptibility of complex microalloyed and low-carbon SiMn3 bainite steel,which is characteristic of domestic nature resources, has been studied by the use of TEKKEN test. It is concluded that no cold crack appears in it even if it is welded without preheating. This is related to the existence of mixture structure of lath bainite+low carbon martensite in the HAZ overheated zone.

STUDY AND APPLICATION OF MULTICOMPONENT LOW-ALLOY BAINITIC CAST STEEL GRINDING BALL

YANG Jun, FU Han-guang

2000, 21(2): 29-33.

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The multicomponent low-alloy bainitic steel grinding balls have been invertigated in accordance to normal grinding balls with high brittleness, low wear-resistance and high wearing-away. The grinding balls are characteristics of high hardness, good uniform hardness and high toughness. By comparision with high chromium cast iron grinding balls, the wearing-away is nearly close to it in the process of ore grinding with the reduction of 30%~40% cost and outstanding comprehensive-benefit.

MATERIAL INJECTION INTO BLAST FURNACE AND EVOLUTIONAL TREND

YANG Shao-li, GUO Xing-zhong, XU Chu-shao, ZHANG Bing-huai

2000, 21(2): 34-39.

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Present state and action of several BF material injection processes are introduced.It is indicated that every material,which may be fed into BF through the furnace roof in the form of lump,can be injected into BF at tuyere as powder,which is taken for an adjustable means required to achieve high quality,high yield, low consumption and long life. Combined injection method mainly based on pulverized coal injection should be taken as the developing trend of BF injection in consideration of the environmental protection and the secondary resource utilization. It is suggested that the combined injection and combustible waste material injection into BF, such as waste plastics and tyre, should be researched further.

ROLLING TECHNOLOGY AT FERRITIC RANGE AND FEASIBILITY APPLIED IN PANGANG

CHEN Xiao-long, CHANG Jun, WANG Jian-hui, WANG Dan

2000, 21(2): 40-45.

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Advantages and characteristics of rolling technology at ferritic range are discussed and the state-of-arts of the technology applied to domestic and abroad producers is introduced as well.The applied feasibility of rolling technology at ferritic range in Pangang is studied.

WASTE HEAT RECOVERY FROM WASTE GASES OUT OF CIRCULAR COOLER AT PANGANG SINTERING PLANT

FAN Fang-ling, GU Hua-xing, ZHENG Hui-jun

2000, 21(2): 46-51.

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The principle,flow sheet,automatic control and application results of the production of steam from waste heat in waste gases out of sintering circular-cooler are discussed.

SEPARATION OF MAGNETIC MATERIALS FROM CONVERTER VANADIUM-BEARING SLAG

LI Da-biao, WANG Xiao-jiang, LI Qian-wen, CENG Zhi-yong, WANG Jin-chao

2000, 21(2): 52-54.

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The separation of magnetic materials from converter vanadium-bearing slag in the process of pretreatment of it for hydrometallurgical vanadium recovery has been researched and moreover,the feasibility and optimization of magnetic separation and screen separation are discussed as well. It is concluded that the screen separation is better than magnetic separation since the magnetic material amount in non-magnetic material is decreased slightly and the quantity of vanadium-bearing slag wrapped into the magnetic material is greatly reduced.

PRIMARY PRESPLIT CONTROLLED BLASTING AND EQUIPMENT FOR DOUBLE-PARALLEL STEP BENCH OF OPEN-CUT MINE

XIE Dian-chun

2000, 21(2): 55-59.

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Abstract:
The controlled blasting nearly to fixed boundary,i.e.effective presplit blasting,effective control of explosive charge at maximum step and total explosive charge and effective thickness control of blasting shock layer nearly close to fixed boundary,is discussed.It is considered that primary presplit blasting formed process of double-parallel bench slope and equipment are keys to parallel step bench,which is normally used at home and abroad.Primary formed process and drilling blasting parameter optimization of the double bench parallel-step slope are presented in accordance to the special slope presplit drilling hole equipment (US CM695D) with primary 36m deep pierce.PLITCONTROL

DU Hou-yi

2000, 21(2): 60-61.

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LIU Shu-qing

2000, 21(2): 62-62.

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LIU Shu-qing

2000, 21(2): 63-63.

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2000 Vol. 21, No. 2