Research on Nitrogen Control Technology of High-Pressure Bottle Steel

2014 ◽  
Vol 988 ◽  
pp. 177-182
Author(s):  
Chen Jun
Keyword(s):  
High Pressure ◽  
Nitrogen Content ◽  
Control Measures ◽  
Nitrogen Control ◽  
Nitrogen Absorption ◽  
High Nitrogen ◽  
Finished Steel ◽  
Casting Technology ◽  
Nitrogen Steel ◽  
Low Nitrogen

Nitrogen content of the high-pressure bottle steel was high and with big fluctuation, it is difficult to control. SO, investigation on nitrogen content of the all steelmaking process is carried out. Results of the investigation indicated that nitrogen content of the aimed steel was high, nitrogen absorption was mainly happened during tapping and in the course of after refining to before casting。And then nitrogen control measures such as low-nitrogen steel melting technology, optimization of deoxidization, protective casting technology is raised. After that nitrogen content of the aimed steel was reduced and nitrogen absorption during tapping and in the course of after refining to before casting was effectively controlled, nitrogen content of the finished steel was stably controlled in 50×10-6, the effect of nitrogen on property of steel is reduced.

Comprehensive Analysis of High Nitrogen Steel Refining Factors with High-Pressure and Bottom-Blowing Nitrogen

2010 ◽  
Vol 146-147 ◽  
pp. 445-453
Author(s):  
Gang Qiang Jin ◽  
Shu Huan Wang ◽  
Yu Feng Guo ◽  
Xin Sheng Liu
Keyword(s):  
High Pressure ◽  
Nitrogen Content ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Thermodynamics And Kinetics ◽  
Nitrogen Steel ◽  
Surface Active ◽  
Steel Refining ◽  
Nitrogen Steels ◽  
Bottom Blowing

The experimental results on high nitrogen steels refining with high-pressure and bottom-blowing nitrogen were analyzed by the theories of thermodynamics and kinetics in high nitrogen steels smelting. It was shown that nitrogen content in steel increases with the increase of the following factors, that is, pressure, alloying elements (Cr and Mn), bottom-blowing time and bottom-blowing flow. While the nitrogen content in steel decreases with the temperature increase, but it is not obvious. The nitrogen content in steel can also increase with the surface active elements (O and S) decreasing.

Influence of Nitrogen Content on the Microstructure and Precipitate of the Medium-Carbon Vanadium Microalloyed Steel

2011 ◽  
Vol 311-313 ◽  
pp. 817-821 ◽  
Author(s):  
Yun Guan ◽  
Xian Zhong Zhang ◽  
Jia Yan Ma
Keyword(s):  
Phase Transformation ◽  
Nitrogen Content ◽  
Local Area ◽  
Spherical Particles ◽  
Microalloyed Steels ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Medium Carbon ◽  
Nitrogen Steel ◽  
Low Nitrogen

The microstructure and precipitate of the two kinds of medium-carbon vanadium microalloyed steels whose nitrogen contents were 0.0035% and 0.012% respectively, were studied by image analysis and transmission electron microscope (TEM). The results show there are the large amount of 10~20nm dispersion distribution irregular flake VC precipitates within the ferrite, the part of clustered fibrous VC precipitates with the diameter of 4~13nm that grow toward to ferrite intracrystalline along the grain boundary with some angle in the local area, and only a very small amount of 20 ~ 50nm spherical particles V (C, N) in the low-nitrogen steel. However, in the high-nitrogen steel, the precipitates are divided into two stages: the first stage is the part of 30~80nm spherical particles V(C, N) which precipitation in austenite, the second stage is flakiness VC which precipitation in ferrite during the following γ → α phase transformation and cooling process. Compared with the low-nitrogen steel, the number of precipitates in decreased significantly and the size increased obviously in the high-nitrogen steel. The substantial increase of nitrogen content leads to the rapid increase of driving force that V (C, N) precipitation in austenite. A lot of V (C, N) that precipitation before phase transformation results in the significant increase of ferrite nucleation rate, which leads to the microstructure of high-nitrogen steel fined obviously.

The Effect of Time to Nitrogen Solubility in Steel with High Pressure and Bottom Blowing Nitrogen

2011 ◽  
Vol 402 ◽  
pp. 202-204
Author(s):  
Ai Min Gao ◽  
Xin Kuo Fang ◽  
Shu Huan Wang
Keyword(s):  
High Pressure ◽  
Nitrogen Content ◽  
Alloy Steel ◽  
Atmospheric Pressure ◽  
Nitrogen Solubility ◽  
Solubility Limit ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Nitrogen Steel ◽  
Bottom Blowing

The high nitrogen steel is alloy steel whose nitrogen content is more than solubility limit at atmospheric pressure[1]. Bottom-blowing high-pressure nitrogen smelting nitrogen steel has many advantages, in the paper, from the study of 18Mn18CrN,it can come to a conclusion that in the case of Temperature of 1853K, pressure of 1.0MPa, the bottom-blowing flow of 0.16m3 / h and temperature of 1873K, pressure of 1.4MPa, the bottom-blowing flow of 0.16m3 / h, With the bottom-blowing time of increased the nitrogen content in steel increases, but when the time is more the 10 minutes, the nitrogen content is saturated.

The Study of Nitrogen Absorption with Slagging in High Nitrogen Steels Smelted by High Pressure and Bottom-Blowing Nitrogen

2010 ◽  
Vol 146-147 ◽  
pp. 1120-1125 ◽  
Author(s):  
Yu Feng Guo ◽  
Shu Huan Wang ◽  
Gang Qiang Jin
Keyword(s):  
High Pressure ◽  
Nitrogen Content ◽  
Aluminum Content ◽  
Pure Aluminum ◽  
Slag System ◽  
Nitrogen Absorption ◽  
High Nitrogen ◽  
Nitrogen Steels ◽  
Bottom Blowing

The experiment studied the influence of slag system on nitrogen content in high nitrogen steels which refined by the method of high-pressure and bottom-blowing nitrogen under the conditions of 1.0Mpa. The results shows that nitrogen content are up to 1.0% without the over of slag, and after adding slag, nitrogen content are up to 1.39%; Alkalinity of protecting slag has little effect on the nitrogen content, however, there are very effective to increase nitrogen after using CaF2 instead of SiO2 ,and its nitrogen content are as high as 1.48%; the effect of increasing nitrogen are clear by adding no more than 0.5% pure aluminum, but when aluminum content are more than 0.5%, the nitrogen content in steel are not change significantly, meanwhile, if adding CaF2 slag system, it will be more effective increase nitrogen than only adding pure aluminum.

Research of Flow Simulation with High-Pressure and Bottom-Blowing Nitrogen

2013 ◽  
Vol 634-638 ◽  
pp. 3110-3113
Author(s):  
Shu Huan Wang ◽  
He Jun Zhang ◽  
Ding Guo Zhao
Keyword(s):  
High Pressure ◽  
Flow Field ◽  
Molten Steel ◽  
Gas Content ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Nitrogen Steel ◽  
Bottom Blowing ◽  
Steel Flow ◽  
Pressure Factor

According to the actual situation of refining high nitrogen steel with the laboratory high pressure reaction axe, the molten steel flow field in the high-pressure and bottom-blowing nitrogen reactor was simulated by using the software Fluent. The rules of the influence of pressure factor on the molten steel flow field characteristics, turbulent kinetic energy and gas content were explored. According to the characteristics of the flow field and gas-liquid two phase structure, the rules of the influence of pressure factor on nitrogen concentration distribution were analyzed. So some useful theoretical basis and guidance were provided for laboratory refining high nitrogen steel and industrial production in the future.

The influence of diet on the nitrogenous components passing to the duodenum and through the lower ileum of sheep

1966 ◽  
Vol 166 (1002) ◽  
pp. 63-79 ◽  
Keyword(s):  
Amino Acids ◽  
Glutamic Acid ◽  
Nitrogen Content ◽  
Aspartic Acid ◽  
Total Nitrogen ◽  
Amino Nitrogen ◽  
Terminal Part ◽  
High Nitrogen ◽  
Low Nitrogen ◽  
Lower Ileum

Analyses of the alimentary contents flowing to the duodenum of sheep during 24 h show that when the sheep are consuming a low-nitrogen diet more total nitrogen and amino nitrogen pass to the duodenum than are eaten daily in the food whereas when the sheep are eating high nitrogen diets, less total nitrogen and less amino nitrogen pass to the duodenum. The disparity between the total nitrogen and amino nitrogen content of the diets largely disappeared by the time the alimentary contents reached the terminal part of the ileum. From 64 to 68% of the nitrogen entering the duodenum and 54 to 64% of the nitrogen in the ileal contents was in the form of amino nitrogen. Proportionately more of the amino nitrogen was in solution in the ileal contents than in the duodenal contents. Losses of amino acids in the stomach when a high-nitrogen diet was consumed were especially large for glutamic acid, aspartic acid, proline, arginine and leucine. They were least for cystine and threonine. Gains of amino acids in the stomach when low nitrogen diets were consumed were all substantial except for proline, where a loss was found when hay and flaked maize were given. When these changes are considered as proportions of the quantities eaten then trends are similar for all acids. Changes in the molar proportions of the amino acids present in hydrolysates of the duodenal and ileal contents are discussed together with the significance of these changes in relation to the nutrition of the sheep.

THE EFFECTS ON THE GRASSHOPPER, MELANOPLUS MEXICANUS MEXICANUS (SAUSS.) (ORTHOPTERA: ACRIDIDAE), OF VARYING THE NITROGEN CONTENT IN ITS FOOD PLANT

1951 ◽  
Vol 29 (5) ◽  
pp. 297-304 ◽  
Author(s):  
D. S. Smith ◽  
F. E. Northcott
Keyword(s):  
Sex Ratio ◽  
Nitrogen Content ◽  
Dry Weight ◽  
Food Plant ◽  
High Nitrogen Content ◽  
Nymphal Instar ◽  
High Nitrogen ◽  
Survival And Development ◽  
Low Nitrogen ◽  
Nutrient Solutions

Melanoplus mexicanus mexicanus (Sauss.), from time of hatching, was fed on wheat (Renown) grown in nutrient solutions of varying nitrogen content. Some wheat was produced with an average nitrogen content of 6.16% (dry weight), some with 4.29%, and some with 3.33%. Survival and development were greatest on the high nitrogen wheat, least on the low. On the low nitrogen wheat no individuals developed beyond the last nymphal instar. Neither weight of adults nor the sex ratio was affected by the various foods. Females fed on wheat with a high nitrogen content laid more eggs but the viability of the eggs was not affected.

Research on Effect of Temperature on Nitrogen Solubility in Steel

2011 ◽  
Vol 415-417 ◽  
pp. 915-919
Author(s):  
Shu Huan Wang ◽  
Cui Liang Wang ◽  
Ding Guo Zhao ◽  
Ju Gao
Keyword(s):  
High Pressure ◽  
Nitrogen Content ◽  
Stainless Steels ◽  
Nitrogen Solubility ◽  
Effect Of Temperature ◽  
High Nitrogen ◽  
Nitrogen Steels

The experiments of high nitrogen steels refining have been researched with high pressure and bottom-blown nitrogen in laboratory. We can gain high nitrogen nickel-free stainless steels that its content is more than 0.9%. The research indicates that the temperature influences nitrogen content greatly in the processes of smelting and concreting. The results are shown that saturated nitrogen content in steel increased slightly. When the temperature is as high as 1913K, the nitrogen content can reach 1.191%.

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