钢铁钒钛

RESEARCH ON MECHANICAL PROPERTIES OF ULTRA-FINE GRAIN STEEL

SONG Li-qiu, HOU Huo-ran, TANG Li, LIU Qing-you, CHENG Xing-de, ZHANG Kai-jian, DONG Han

2003, 24(4): 1-5.

Abstract(74) PDF(1)

Abstract:
Ultra-fine grain hot rolled sheets were produced in 1450 hot mill at PZH Steel, its composition is the same as Q235. The microstructures of ultra-fine grain steel are ferrite and pearlite. Ferrite grain size is about 4 μm. The tensile strength and yield strength of hot rolled sheets are over 510 MPa...

TESTING ON PRODUCTION OF VANADIUM-MICROALLOYED HSLA STEEL WITH OVER 550 MPa STRENGTH IN CSP

ZHU Tao, JIANG Chang-lin, HE Yi-zhu

2003, 24(4): 6-13.

Abstract(74) PDF(1)

Abstract:
In order to produce HSLA steel which tensile strength exceeds 550 MPa on CSP line, chemical composition design, CSP continuous-casting simulation, rolling test and Gleeble experiment were carried out. The effect of vanadium-microalloying and controlled rolling & controlled cooling technique was ...

EFFECT OF HOT DIP PROCESS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Ti-IF STEEL SKIN-PASSED GALVANIZED SHEET

ZHENG Zhi-wang, XU Zhe-feng, CHEN Jie

2003, 24(4): 14-19.

Abstract(78) PDF(2)

Abstract:
Effect of hot dip process on the microstructure and mechanical properties of Ti-IF steel skin-passed galvanized sheet are studied on a continuous hot dip galvanizing line. The results show that the ferrite grain has a size of No.10 when the sheet temperature in RTH is below 830℃ and then coarsens gr...

STUDY ON CORROSION RESISTANCE OF JT245 WEATHER-RESISTANT TOWER STRUCTURAL STEEL

XIA Mao-sen, CAI Zhang-ping, LIU Jiang, JIANG Shan-yu, GU Bao-shan, GUAN Xiao-jun

2003, 24(4): 20-24,34.

Abstract(64) PDF(1)

Abstract:
The corrosion resistance of JT245 tower structural steel was tested through interior accelerated corrosion test, electrochemical corrosion test, outside atmospheric corrosion test and surface rusty scale analysis. The results show that the weather resistance of JT245 is as well as CortenA. JT245 ste...

RESEARCH ON PRODUCTION OF 300 km/h HEAVY RAIL USING CONTINUOUSLY CAST ROUND BLOOM

CHEN Yong, LI Gui-jun, ZHAO Ke-wen

2003, 24(4): 25-30.

Abstract(76) PDF(3)

Abstract:
The manufacturing process of EF steelmaking→LF refining→VD degassing→round concast has been established, by which rail steel round blooms U71Mn and PD₃ have been successfully produced three times. The inspection of round bloom quality suggests that the surface defect-free achieves 100% of total roun...

EFFECT OF MICROALLOY ELEMENT Cr ON MICROSTRUCTURE AND PROPERTIES OF HIGH-CARBON STEEL WIRE

FENG Yun-li, YANG Hai-li

2003, 24(4): 31-34.

Abstract(64) PDF(1)

Abstract:
The effect of microalloying element Cr on microstructure and mechanical properties of high-carbon steel wire and the reasonable content of Cr in steel were investigated. The results show that the microstructure of steel is optimized with the Cr added,the content of pre-eutectoid ferrite in metallogr...

EXPERIMENTAL INVESTIGATION ON DISSOLVING OXYGEN IN HOT METAL PRETREATMENT

WU Bao-guo, LI Chun-lin, DONG Yuan-chi, WANG Shi-jun

2003, 24(4): 35-38.

Abstract(48) PDF(1)

Abstract:
The changing law of oxygen potential was studied during hot metal pretreatment by using Fe₂O₃-CaO-CaF₂ and Na₂CO₃-Na₂SO₄ fluxes under the laboratory conditions. At the same time, the suitable range of oxygen potential for removing phosphorus and sulfur simultaneously was discussed. The results show ...

CONTROLLING OF INCLUSION MORPHOLOGY IN STEEL CORD BY COMPOSITE REFINING SLAG

ZHANG Jun, WANG Yong, LI Ben-hai, XU Xiao-dong

2003, 24(4): 39-43.

Abstract(58) PDF(1)

Abstract:
The inclusion morphology is controlled by changing slag formation and reducing the added quantity of Al and bauxite in refining process. The results demonstrate that the most effective method to control the inclusion morphology is adding wollastonite or the mixture of wollastonite in refining proces...

EFFECT OF LADLE REFINING TECHNIQUE ON YIELDING RATE OF VN ALLOY

ZHANG Chen

2003, 24(4): 44-48.

Abstract(86) PDF(3)

Abstract:
The effect of ladle refining parameters on yielding rate of N and V of VN alloy was studied. The results show that the temperature, composition of steel and the slag quantity have no effects on the yielding rate. Oxygen-potential is the key factor, and its regressive relationship with the yielding r...

RESEARCH ON INCREASING TiO₂ RECOVERY PERCENT ON MAIN MANUFACTURING PROCESS AT TITANIUM RECOVERY PLANT OF PZH STEEL

CENG Li-guo

2003, 24(4): 49-54.

Abstract(61) PDF(1)

Abstract:
According to the situation of total TiO₂ recovery percent being lower 21% in the main manufacturing process (coarse ore dressing) and tiny ore manufacturing process (tiny ore dressing) at Titanium Recovery Plant of PZH Steel, the effect of magnetic mineral on TiO₂ recovery percent from gravity conce...

RESEARCH ON WEATHERABILITY OF NANO-TiO₂ MODIFYING EXTERIOR LATEX PAINT

WU Jian-chun, HUANG Wan-xia, ZHENG Hong-ping, CAO Jian-jun

2003, 24(4): 55-58.

Abstract(88) PDF(1)

Abstract:
Employing ultrasonic dispersing technology makes nano-TiO₂ powder into normal latex paint to manufacture nano-TiO₂ modifying latex paint. The experiments show that the ageing resistance and weatherability of latex paint is evidently improved as nano-TiO₂ powders being dispersed into.

TESTING AND ANALYSING FOR DUCTILE-BRITTLE TRANSITION TEMPERATURE OF HRB400 ANTI-SEISMIC STEEL BAR

QIN Bin, SHENG Guang-min, GONG Shi-hong

2003, 24(4): 59-63.

Abstract(71) PDF(1)

Abstract:
Series of impact test for HRB400 anti-seismic steel bars with diameters of Ø25 mm and Ø32 mm dedicate the ductile-brittle transition temperature of big size steel bars are higher than small ones. Light microscope observation reveals the Ø32 mm steel bar has coarse grain, SEM show brittle fracture ta...

INFLUENCE OF CONTAINING Ba DEOXIDIZER ON QUALITY OF STEEL STRIP

ZHENG Wen-guang, GUO Dian-feng, ZHAO Dian-qing, ZHANG Xiao-guang

2003, 24(4): 64-66.

Abstract(68) PDF(1)

Abstract:
The influence of two different deoxidizer BaCaAlSi and SiC on quality of steel strip were investigated by contrasting the deoxidizing practice of BaCaAlSi and SiC in steel tapping. The T[O] is 14.8×10^-6 and 17.8×10^-6 respectively, [N] is 48.6×10^-6 and 53×10^-6 respectively in steel strip when adoptin...

INFLUENCE OF ALLOYING ELEMENT TITANIUM ON FORMATION OF D-TYPE GRAPHITE

LI Xiao-ping, ZHONG Yuan-long, LIN Yuan-zu

2003, 24(4): 67-70.

Abstract(77) PDF(2)

Abstract:
The influence of alloying element Ti on the formation of D-type graphite was analyzed from two aspects. Ti promotes the precipitation of primary austenitic dendrite, affects the morphology of the austenitic dendrite, and creates the avail condition for nucleation and growth of D-type graphite. The i...

2003 Vol. 24, No. 4