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GRAIN COARSENING BEHAVIOR OF V-Ti-N MICROALLOYED STEELS

TANG Guoyi ZHENG Yangzeng Yanshan University , Qinhuangdao , ChinaCAI Qigong , ZHU Jing Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , China TANG Guoyi , Dept.of Graduates , Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing 100081 , China

金属学报(英文版)

The effects of chemical composition and cooling rate after solidication on the grain coarsening temperature,T_(GC),of the V-Ti-N microalloyed steels have been investigated.It is shown that the T_(GC) may be obviously raised by adding even a little Ti to the base steel so as to pre- cipitate a great deal of fine Ti-bearing particles of about 10 nm.The T_(GC) does not increase with the cooling rate,as it is over a certain critical value.The T_(GC) is insensitive to any varia- tion of N content at simulated cooling condition of 150 mm continuous cast slab.The T_(GC) may be dropped down about 100℃ by adding 0.33 wt-%Mo to the steels.The sensitivi- ty of T_(GC) to cooling condition relates to the Ti and V contents.

关键词: microalloyed steel , null , null

MISCIBLE PRECIPITATES IN V-Ti-N MICROALLOYED STEELS

TANG Guoyi ZHENG Yangzeng Yanshan University , Qinhuangdao , ChinaCAI Qigong ZHU Jing Central Iron and Steel Research Institute , Beijing , China ZHENG Yangzeng Professor , Department of Material Engineering , Yanshan University , Qinhuangdao , China

金属学报(英文版)

The characteristics and the formation of the miscible particles in V-Ti-N microalloyed steels were studied.It was found that the vanadium to form V-Ti miscible particles starts to precipi- tate after pouring and cooling to temperature below 11 50℃ by means of the epitaxial precipi- tation on the pre-existing titanium nitrides.The vanadium content in the particles is markedly influenced by the cooling rate after solidification.

关键词: microalloyed steel , null , null

BEHAVIOR OF FINE V-Ti COMPLEX CARBONITRIDE IN STEEL 09MnVTiN DURING REHEATING

TANG Guoyi ZHENG Yangzeng Yanshan University , Qinhuangdao , China ZHU Jing CAI Qigong Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , China

金属学报(英文版)

An investigation was carried out of the morphology and microstructure of V-Ti complex carbonitride in steel 09MnVTiN during reheating under analytical electron microscope.The prior V-rich ellipsoid V-Ti complex carbonitride particles are replaced progressively by Ti-rich cubic ones as the reheating temperature elevated from 1050 to 1400℃.The Ti con- tents in the core and border of particles increase from 15 and 6% in hot-rolled specimens into 84 and94% at 1400℃ respectively.

关键词: steel 09MnVTiN , null , null , null

University of Science and Technology Beijing

JIA Shizhen University of Science and Technology Beijing , China.

材料科学技术（英文）

关键词:

Online Shape Dynamic Wrapping Angle Compensation Model of Cold Strip

YANG Li-po , YU Bing-qiang , YU Hua-xin

钢铁研究学报(英文版)

In specific condition, when wrapping angle of cold rolling strip covering surface of shape detecting roll dynamically changes, online radial compression of the shape detecting roll is changed too, and it seriously affects online shape detecting precision of cold strip. Based on the latest intelligent shape meter developed by Yanshan University, using PSO-BP neural network and actual working condition datum, the cold strip online dynamic wrapping angle compensation model is established, and successfully applied in 1250 mm 6-high cold mill, remarkable results are achieved. The error between calculated values and measured values of total tensions is within 3%.

关键词: cold rolling strip , shape detecting , wrapping angle , compensation , shape meter , cold mill